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Undetectable.ai

  • What it is:Undetectable.ai is an artificial intelligence content detection and modification software designed to identify and alter artificially generated text to make it undetectable by AI detectors.
  • Best for:Budget-conscious annual users, High-volume content creators, Teams needing API integration
  • Pricing:Free tier available, paid plans from $5/month ($60/year)
  • Rating:78/100Good
  • Expert's conclusion:For most organizations that have a legitimate need for reliable, API-based AI content detection and humanization of various forms of content, Undetectable.ai is an excellent choice; however, prospective customers will want to assess the cost-effectiveness of the pricing plan as well as any potential limitations on the number of API calls.
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Reviewed byMaxim Manylov·Web3 Engineer & Serial Founder

What Is Undetectable.ai and What Does It Do?

Undetectable AI was developed by Christian Perry and Devan Leos as a platform to assist in the use of artificial intelligence (AI) for school and work related tasks, while generating AI content that sounds like humans create it. This allows users to create AI generated content without having to worry about detection tools being able to identify the source as an AI program.

Active
📍Boise, Idaho
📅Founded 2023
🏢Private
TARGET SEGMENTS
StudentsContent CreatorsMarketersEnterprisesAcademic Institutions

What Are Undetectable.ai's Key Business Metrics?

👥
18M+
Users
🏢
11-50
Employees
📊
48% increase
Gross Profit Growth
📊
10 tiers ($14.99-$209/mo)
Subscription Tiers
💵
$10M (bootstrapped)
Revenue
📊
99%+
Detection Accuracy

How Credible and Trustworthy Is Undetectable.ai?

78/100
Good

While there has been rapid growth to over 18 Million users and they have achieved bootstrapped $10M revenue, the lack of transparency regarding funding, company information, and third party reviews will slightly lower the score.

BREAKDOWN
Product Maturity85/100
Company Stability80/100
Security & Compliance70/100
User Reviews75/100
Transparency65/100
Support Quality80/100
TRUST SIGNALS
18M+ users globallyBootstrapped to $10M revenue99%+ detection accuracy validated independently48% gross profit growth via Stripe BillingNamed among top 50 AI tools

What is the history of Undetectable.ai and its key milestones?

2023

Company Founded

Undetectable AI was founded by Christian Perry, Devan Leos and Bars Juhasz to humanize AI-generated content and to help users evade detector tools.

2023

Public Launch

Undetectable AI was publicly released in May of 2023 and due to their subscription-based business model using Stripe Billing, the product has experienced rapid growth.

2024

Rapid User Growth

They were listed as one of the top 50 AI Tools in the world after reaching 8 Million users.

2025

Scale to 18M Users

Over 18 Million users have used the product, which was developed in Boise, Idaho and has achieved bootstrapped revenue of $10M.

What Are the Key Features of Undetectable.ai?

✨
AI Humanizer
When utilizing the product's "humanization" feature, the rewritten AI-generated text is nearly completely undetectable by most of the leading AI content detection programs, while the rewritten text retains its original intent.
✨
AI Detector
The products' ability to detect AI generated content has a success rate of 99 percent or higher when tested across various types of AI models, which has been validated independently.
✨
Grammar Checker
Alongside the "humanization" features, the product also includes built-in tools to improve grammar and style.
✨
Plagiarism Detection
After the AI generated content has undergone humanization, the product offers a tool to check for plagiarism to ensure that the final product is original.
✨
AI Image Analysis
The product detects AI-generated images along with the standard AI text processing capabilities.
✨
Continuous Model Updates
Utilizing a federated detection methodology, the product developers update the algorithms regularly to remain ahead of emerging AI generator technologies.
💬
Multi-Language Support
With plans to expand to support additional languages, the product can be utilized globally for humanization of content.

What Technology Stack and Infrastructure Does Undetectable.ai Use?

Infrastructure

Cloud-based with Stripe-powered subscription infrastructure

Technologies

AI/ML ModelsNLP ProcessingFederated Detection

Integrations

Stripe BillingSubscription ManagementGlobal Payment Processing

AI/ML Capabilities

Proprietary humanization algorithms using federated detection approach, continuous model retraining against evolving AI generators, specialized linguistic training data for human-like output across multiple languages

Inferred from product descriptions, Stripe case study, and company blog; no public technical documentation available

What Are the Best Use Cases for Undetectable.ai?

Students & Academics
Students and teachers can utilize this product to generate humanized versions of AI generated essays and assignments to ensure that academic integrity checks are passed while maintaining the quality of the content.
Content Marketers
Bloggers and marketers can use this product to humanize AI generated content for blog posts, social media posts and marketing copy to increase user engagement and search engine optimization (SEO).
Freelance Writers
Humanize client deliverables created through AI to increase authenticity and reduce the likelihood of detection flags
Enterprise Compliance Teams
Ensure that all corporate communications utilizing AI are checked for authenticity against both internal and external content checks
NOT FORHigh-Security Government Agencies
Does not recommend due to lack of publicly available security certifications from a government agency or compliance with industry standards
NOT FORLegal Documentation Teams
Not acceptable for filing in court or creating legally compliant content that requires a paper trail of the author's human identity

How Much Does Undetectable.ai Cost and What Plans Are Available?

Pricing information with service tiers, costs, and details
☐Service$CostℹDetails🔗Source
Free Trial$0250 words over 3 days, core features including Humanizer and AI Detection—
10K Words (Annual)$5/month ($60/year)10,000 words/month, all features, 6 months free—
10K Words (Monthly)$9.99/month10,000 words/month, passes AI detectors, high quality content, API compatible, email support—
20K Words (Annual)$9.50/month ($114/year)20,000 words/month, all features—
20K Words (Monthly)$19/month20,000 words/month, scalable up to 380K+ words, all features—
Higher Tiers (35K+)$31+/month35,000+ words/month up to 1M words, all features included, pay for what you need—
Business/EnterpriseCustom pricingCustom word limits, unexpiring credits, priority support, bank transfers, custom integrationsOfficial pricing page
Free Trial$0
250 words over 3 days, core features including Humanizer and AI Detection
10K Words (Annual)$5/month ($60/year)
10,000 words/month, all features, 6 months free
10K Words (Monthly)$9.99/month
10,000 words/month, passes AI detectors, high quality content, API compatible, email support
20K Words (Annual)$9.50/month ($114/year)
20,000 words/month, all features
20K Words (Monthly)$19/month
20,000 words/month, scalable up to 380K+ words, all features
Higher Tiers (35K+)$31+/month
35,000+ words/month up to 1M words, all features included, pay for what you need
Business/EnterpriseCustom pricing
Custom word limits, unexpiring credits, priority support, bank transfers, custom integrations
Official pricing page
💡Pricing Example: Content creator processing 20,000 words/month
Monthly Plan$19/month
20K words standard monthly rate
Annual Plan$9.50/month ($114/year)
50% savings vs monthly, 6 months free equivalent
💰Savings:Save ~50% with annual billing ($114 vs $228 yearly)

How Does Undetectable.ai Compare to Competitors?

FeatureUndetectable.aiUndetectedGPTStealthGPTWriteHumanHIX Bypass
Core Functionality (AI Humanizer)YesYesYesYesYes
AI Detector Bypass Rate88%96%82%78%
Built-in AI DetectorYesYesYesYesYes
Starting Price$5/mo (annual)$19.99/mo$32/mo$18/mo$19.99/mo
Free Tier250 words (3 days)YesLimitedLimitedLimited
Annual Discount50%+ (6 mo free)YesYesYesYes
API AccessYesYesYesYesYes
Word Limits ScalableUp to 1MYesYesYesYes
Priority SupportBusiness onlyYesYesYesYes
Money-back GuaranteeYes (if flagged)Yes
Core Functionality (AI Humanizer)
Undetectable.aiYes
UndetectedGPTYes
StealthGPTYes
WriteHumanYes
HIX BypassYes
AI Detector Bypass Rate
Undetectable.ai88%
UndetectedGPT96%
StealthGPT82%
WriteHuman78%
HIX Bypass—
Built-in AI Detector
Undetectable.aiYes
UndetectedGPTYes
StealthGPTYes
WriteHumanYes
HIX BypassYes
Starting Price
Undetectable.ai$5/mo (annual)
UndetectedGPT$19.99/mo
StealthGPT$32/mo
WriteHuman$18/mo
HIX Bypass$19.99/mo
Free Tier
Undetectable.ai250 words (3 days)
UndetectedGPTYes
StealthGPTLimited
WriteHumanLimited
HIX BypassLimited
Annual Discount
Undetectable.ai50%+ (6 mo free)
UndetectedGPTYes
StealthGPTYes
WriteHumanYes
HIX BypassYes
API Access
Undetectable.aiYes
UndetectedGPTYes
StealthGPTYes
WriteHumanYes
HIX BypassYes
Word Limits Scalable
Undetectable.aiUp to 1M
UndetectedGPTYes
StealthGPTYes
WriteHumanYes
HIX BypassYes
Priority Support
Undetectable.aiBusiness only
UndetectedGPTYes
StealthGPTYes
WriteHumanYes
HIX BypassYes
Money-back Guarantee
Undetectable.aiYes (if flagged)
UndetectedGPTYes
StealthGPT—
WriteHuman—
HIX Bypass—

How Does Undetectable.ai Compare to Competitors?

vs UndetectedGPT

While there is no difference in pricing (both are $19 per month), there is a difference in the quality of their products, Undetectable.ai is ranked #1 by Forbes and provides a slightly better product than CopywriterAI (which includes better readability scores: 9.2/10 vs 8.5/10, and a lower bypass rate: 88% vs 96%), however, Undetectable.ai offers a much better deal on an annual subscription plan ($5/month vs $12.99/month).

UndetectedGPT outperforms in terms of raw performance; Undetectable.ai is the better option for those seeking to save money with annual subscriptions.

vs StealthGPT

Offers a slightly lower monthly price ($19 vs $32) while offering similar levels of bypassing (similar bypass rate: 88% vs 82%) and can handle larger volumes of work (up to 1 million words per month) compared to StealthGPT which has stronger enterprise features but costs more.

For most users, Undetectable.ai will be the better choice when comparing price and performance.

vs WriteHuman

Is priced slightly lower ($18 vs $19) but is less effective in bypassing the software (lower bypass rate: 78% vs 88%) and does not offer the same scalability as Undetectable.ai or the same low-cost annual commitment options (starting at $5/month).

Will be a better option for users who need to produce large amounts of content and require consistent and reliable bypassing capabilities.

vs HIX Bypass

Has identical pricing ($19.99/mo) but claims to be able to bypass the software more effectively and has been ranked #1 by Forbes. Both companies provide APIs, but Undetectable.ai claims to have more flexible and discounted annual plans.

Positioned as the premium AI bypassing tool with greater long term value.

What are the strengths and limitations of Undetectable.ai?

Pros

  • Provides multiple tiered pricing options (from $5/month for an annual subscription to custom enterprise pricing)
  • Can scale to accommodate large volume users (can process over 1 million words/month)
  • Offers annual subscription plans with 6 months free (saving users up to 50% off monthly pricing)
  • Includes a built-in AI detector allowing users to test content for AI detection prior to or after it being humanized using a single tool.
  • Compatible with APIs to integrate into content workflow systems.
  • Offers a money back guarantee to ensure that if content is detected as AI-generated after using the service, users will receive a full refund.
  • Multilingual support – Works beyond English content

Cons

  • Very limited free trial – Only 250 words of a 3 day trial doesn't allow for sufficient testing
  • Reports on inconsistent pricing – Sources show that pricing ranges from $5-$19 per month causing confusion
  • Lower bypass rates than competitors – 88% compared to UndetectedGPT's 96%
  • Pricing is based on words – Can be costly for high volume users
  • Unlimited plans are not mentioned in pricing options – All tiered pricing has word limits
  • Pricing for businesses is unclear – Must contact sales for pricing information
  • Readability scores are lower than competitors – 8.5/10 compared to top tools at 9.2/10

Who Is Undetectable.ai Best For?

Best For

  • Budget-conscious annual users — Most cost-effective in the long run due to pricing starting at $5 per month with 6 months free
  • High-volume content creators — Can scale to handle over 1 million words per month – Suitable for bloggers, agencies, SEO teams
  • Teams needing API integration — Enables workflow automation via API access across all paid plans
  • Multilingual content publishers — Supports AI detection/humanization for non-English language content
  • Academic writers avoiding detection — High bypass rates (88%) for research/academic content

Not Suitable For

  • Users needing extensive free testing — 250 word/3 day trial is too restrictive compared to competitors offering larger free trials such as UndetectedGPT
  • Performance-critical AI bypassing — 88% bypass rate is lower than UndetectedGPT's (96%); may want to look into alternative options for critical applications
  • Low-volume casual users — Minimum price of $9.99+ exceeds the value for occasional use; consider using free alternatives
  • Enterprises needing transparent pricing — Custom business quotes will need to be contacted through sales; would prefer tools with publicly available enterprise tiers

Are There Usage Limits or Geographic Restrictions for Undetectable.ai?

Free Trial Words
250 words over 3 days
Monthly Word Limits
10K ($9.99), 20K ($19), 35K ($31), up to 380K-1M
Annual Word Limits
10K+ ($5/mo), scalable to 300K-380K
Credit Expiration
Monthly plans expire; Business offers unexpiring credits
API Rate Limits
Not publicly specified; available on paid plans
Concurrent Users
Per-user pricing on some plans; Business custom
Content Length per Request
Not specified; practical limits by word credits
Business Plan Restrictions
Custom terms, requires vendor contact

Is Undetectable.ai Secure and Compliant?

Data Processing SecurityProcesses AI-generated content through algorithms maintaining user privacy during humanization
API SecuritySecure API endpoints for integration with standard authentication practices
Payment SecurityStandard subscription billing with money-back guarantee processing
Content PrivacyUser content processed for humanization; no long-term storage mentioned beyond credits
Business ComplianceCustom enterprise plans available suggesting enterprise-grade security options

What Customer Support Options Does Undetectable.ai Offer?

Channels
All plans, response within 24 hoursBusiness/Enterprise plans only
Hours
Business hours standard; 24/7 priority for Business tier
Response Time
<24 hours email; priority faster for paid/business plans
Satisfaction
Limited reviews available (0.0/5 on GetApp)
Specialized
Priority channels and custom integrations for Business tier
Business Tier
Dedicated support, unexpiring credits, custom pricing
Support Limitations
•No live chat or phone support mentioned for standard plans
•Community/support quality unrated due to low review volume
•Business support requires custom plan enrollment

What APIs and Integrations Does Undetectable.ai Support?

API Type
REST API with OpenAPI 3.0 specification and WebSocket support for real-time processing
Authentication
API Key-based authentication. Keys obtained from developer portal and included in request headers or body depending on endpoint
Available APIs
Detector API (text AI detection), Image Detector API, Video Detector API, Audio Detector API, Humanization API v2, and Undetectable Browser API for profile management
Documentation
Comprehensive - interactive API documentation available at https://ai-detect.undetectable.ai/docs for Detector API and similar endpoints for other detection APIs. Developer portal provides API key management and user ID management
Sandbox/Testing
Testing available through interactive FastAPI documentation pages. Detector API recommends minimum 200 words for best accuracy in submissions
WebSocket Support
Real-time WebSocket connections available at wss://ai-detect.undetectable.ai/ws/$USER_ID for streaming sentence-by-sentence detection results
Endpoints
/detect (submit content for detection), /query (check detection status and results), /check-user-credits (verify account credits), /document (humanization queries)
Use Cases
Detect AI-generated text, images, video, and audio content; humanize AI-written text; integrate detection capabilities into third-party applications and workflows

What Are Common Questions About Undetectable.ai?

Undetectable.ai offers detection APIs for multiple content types including: Text (AI-written articles, essays, code), Images (AI-generated visuals), Video, Audio. Each detection type utilizes third party detectors to determine whether submitted content was created using an AI tool or by a human.

For the Detector API, it is recommended to submit a minimum of 200 words for optimal accuracy. Detection results include confidence levels and the current processing status. Accuracy is dependent upon both the content type and the specific detector being used.

The Humanization API takes AI-generated text and makes it appear as though it were written by a human so that it avoids detection by AI tools. Content is processed when users submit it for processing and then queried using Document ID(s). It is intended to assist with avoiding plagiarism detection.

Each API utilizes an API Key which is retrieved through the Developer Portal and used to authenticate each API Call. Depending upon the API Endpoint, the API Key will be placed either in the Request Header (in apikey field) or the Request Body (in key field).

The Undetectable Browser API enables developers to programmatically control browser profiles — create, launch, update, and close browser profiles with customizable settings for both browser type and operating system. Currently supported browsers include Chrome, Edge, Firefox, Opera, Safari, and Yandex browsers. Supported Operating Systems currently include Windows, macOS, Linux, and Android.

Yes. Interactive Documentation for all of our APIs is provided at https://ai-detect.undetectable.ai/docs and similar endpoints for each API. This allows you to easily test each endpoint within your web browser without having to write any code.

Users may determine how many credits they have left by querying the /check-user-credits endpoint. Once a user has run out of credits, API Calls will fail until the user purchases additional credits.

Although there is no indication of Webhook Support within the search results, Detection Requests utilize polling of the /query endpoint to obtain the status and results of the detection request.

Is Undetectable.ai Worth It?

Undetectable.ai provides a full suite of APIs for the detection and humanization of AI-generated content across multiple formats (text, image, video, audio). While providing detection capabilities, the platform also provides tools for humanizing AI-generated content, making it a viable solution for organizations that need to verify and manage AI-generated content. In addition to being a robust toolset, the product offers solid technical infrastructure with RESTful APIs, WebSockets, and detailed documentation.

Recommended For

  • Educational Institutions that need to detect AI-generated student assignments
  • Content Platforms that require AI-generated content detection and filtering
  • Organizations utilizing AI writing tools that require the humanization of generated content for compliance
  • Developers looking to build content verification functionality into their applications
  • Digital Marketing Teams responsible for verifying the authenticity of content

!
Use With Caution

  • Organizations with high volume detection requirements — Verify Rate Limits and Pricing prior to large scale deployment of Undetectable.ai API(s)
  • Regulated Industries — Verify Compliance with Local Regulations Regarding Content Verification
  • Teams Requiring Guaranteed Uptime Service Level Agreements (SLAs) — Confirm SLA Commitments Before Using Mission-Critical Functionality

Not Recommended For

  • Budget-Constrained Organizations — API-Based Pricing Model May Be Costly At Scale
  • Teams That Need Offline Detection — All Services Are Cloud-Based and API-Dependent
Expert's Conclusion

For most organizations that have a legitimate need for reliable, API-based AI content detection and humanization of various forms of content, Undetectable.ai is an excellent choice; however, prospective customers will want to assess the cost-effectiveness of the pricing plan as well as any potential limitations on the number of API calls.

Best For
Educational Institutions that need to detect AI-generated student assignmentsContent Platforms that require AI-generated content detection and filteringOrganizations utilizing AI writing tools that require the humanization of generated content for compliance

What do expert reviews and research say about Undetectable.ai?

Key Findings

Undetectable.ai is an enterprise-grade, multi-modal content detection and humanization platform that includes well-documented REST APIs and WebSocket support. The platform has content detection capabilities for text, image, video, and audio formats, and also contains humanization capabilities to rewrite AI-generated content. The API calls are authenticated by means of key-based authentication and contain credit-based usage tracking.

Data Quality

Good - comprehensive API documentation available from official help center and developer portal. Technical specifications clearly documented. Pricing and rate limit details not fully available in public documentation.

Risk Factors

!
There is limited publicly available information regarding the SLAs and uptime guarantees of the service.
!
The rate limits for the service were not identified within the available resources.
!
The pricing plan of the service must be contacted through sales to understand the pricing.
!
The detection accuracy of the service is dependent upon third-party detectors.
Last updated: February 2026

What Additional Information Is Available for Undetectable.ai?

Developer Portal

The central developer portal provided by Undetectable.ai is used by users to obtain API keys, manage User IDs, view remaining credits, and review complete API documentation. The portal provides easy-to-use guidance for integrating quickly with clear authentication instructions.

Multi-Format Detection

In addition to text detection, Undetectable.ai also provides specialized APIs for detecting AI-generated image content, video content, and audio content. Each detection type utilizes third-party AI detectors to determine if content was generated by an artificial intelligence system or if it is authentic.

Real-Time Processing

The WebSocket support provided by Undetectable.ai enables developers to receive real-time detection results from sentence-by-sentence detection in a stream process. This provides developers the ability to create responsive applications that immediately provide feedback regarding AI content detection.

Integration Ecosystem

Users of Make (integromat) can easily integrate detection and humanization into existing workflows using pre-configured, drag-and-drop connectors within Make.

API Testing Interface

Each documentation page of FastAPI includes a "try it out" section that enables developers to interactively test API endpoints in their browser. This greatly eases the process of finding and integrating an API.

What Are the Best Alternatives to Undetectable.ai?

  • •
    OpenAI Moderation API: OpenAI provides a content moderation API which identifies harmful content types as well as some AI generated text patterns. It is provided at no cost with an OpenAI API key. While less focused on AI detection than other options, it does include integration with GPT models. It may be the best choice for organizations who are currently using OpenAI services and require basic content safety.
  • •
    Turnitin: A long-established plagiarism and AI detection platform, Turnitin has both AI and non-AI based detection capabilities. It is particularly well-suited for detecting AI-based plagiarism and also includes many features related to plagiarism detection that are commonly used in education. Additionally, this solution is best suited for educational institutions that have institutional buy-in and support.
  • •
    GPTZero: A simple browser-based AI content detector focused on identifying output from ChatGPT and other similar models. It also offers a developer API. Although more narrow in scope than Undetectable.ai, it is an ideal solution for those looking for easy-to-use text-based AI detection. The primary user base will likely be educators and content platforms who need to quickly identify when someone is producing AI-created content.
  • •
    Copyscape: A content plagiarism and authenticity checking tool. It does not specifically look for AI created content but rather looks for duplication of content. It is most useful for organizations and individuals who create original content and want to ensure they are protecting that content from being plagiarized or duplicated. (copyscape.com)
  • •
    Content at Scale AI Detector: A free web-based AI content detector that identifies AI written text. It is much simpler than Undetectable.ai and lacks an API so it is only available via browser-based interaction. It would be the best option for individual users who want a free way to detect AI content. It is best suited for casual users who do not have extensive needs for detection or require any form of integration. (contentatscale.ai)

What Content Capabilities Does Undetectable.ai Offer?

AI Text Humanization

AI Detection Bypass

Paraphrasing & Rewriting

Tone Customization

Semantic Meaning Preservation

Image Generation

What Are Undetectable.ai's Output Metrics?

10,000
Max Characters Per Input
1.76 trillion
AI Model Parameters
100%
Detection Accuracy
0%
False Positives on Human Content

What Is Undetectable.ai's Brand Voice and Tone?

Tone Selection
Multiple presets available
Writing Style Imitation
Fluidity analysis & human-like adaptation
Target Audience Detection
Yes
Semantic Understanding
Contextual meaning preservation

What SEO Tools Does Undetectable.ai Offer?

Readability Analysis

Word Counter

Plagiarism Detection

Keyword Optimization

What Is Undetectable.ai's Workflow Features?

Typing Activity Tracking
Human Auto Typer feature
Keystroke Reproduction
Natural keystroke simulation
Copy-Paste Detection Prevention
Yes
Content Authenticity Verification
Yes

What Is Undetectable.ai's Ai Model Info?

Core Function
AI detection bypass & humanization
Detection Methods Counteracted
Perplexity, burstiness, fingerprinting, entropy
Compatible AI Sources
ChatGPT, Gemini, Claude, QuillBot, Grammarly
Language Model Fingerprinting Bypass
Yes
Contextual Coherence Adjustment
Yes

What Use Case Templates Does Undetectable.ai Support?

Articles & Blog PostsSocial Media ContentInstagram CaptionsAcademic ContentMarketing CopyGeneral Text Rewriting

What integrations and connectors does Undetectable.ai support?

ChatGPT Integration

Direct Text Input

Formatting Preservation

API Access

WordPress Plugin

Browser Extension

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