DetectGPT vs Undetectable AI
DetectGPT and Undetectable AI sit on opposite sides of the detection game. DetectGPT is a detection-first approach, rooted in the zero-shot detection research method that scores text by how a language model would have perturbed and regenerated it; detection-oriented tools in the directory are typically free or freemium. Undetectable AI is the commercial humanizer: rewrites AI text to evade detectors, meters by word (Starter 10,000 words at $9.99/month, about $5/month on annual billing; Pro 20,000 at $19/month, about $9.50 annual; observed September 2026), with a built-in detector and API access. Note the honest loop: Undetectable AI's own rewrites have been measured at 71-88% AI on Originality.ai in independent tests, so neither side of this pairing is a certainty. Use detection tools to audit drafts and set policy; use humanizers only on content you already intend to edit and stand behind. We could not verify DetectGPT's current pricing, so check its official site. We did not hands-on test either product, so no quality winner is declared.
| Decision point | DetectGPT | Undetectable AI |
|---|---|---|
| Best suited to | Teachers, students and writers that need to check whether content is flagged as AI across models including ChatGPT, GPT-4 and Gemini.; Clients and editors that want shareable original-content certification for human-written work. | Content teams softening stiff AI-drafted marketing copy before publishing |
| Plans and cost | The homepage pricing section lists Essential at $15 per month for 50,000 words per month and 1 user seat, Pro at $29 per month for 250,000 words per month and 3 team members, and Team at $59 per month for 500,000 words per month and unlimited team members, with a yearly option showing 6 months free; the page read names no currency for these $ amounts, so no charge fact is recorded. Free scanning starts at up to 5,000 characters with no credit card required. | Free 250-word trial. Starter 10,000 words $9.99/month ($5/month on annual billing); Pro 20,000 words $19/month ($9.50/month annual); Growth 35,000 words $31/month; Business custom. Observed September-October 2026. |
| Limitations | Free scanning is capped at 5,000 characters in the text read, so long documents need a paid plan.; Detection is a probability judgement, not proof of authorship, so results need human review before acting on them. | Independent 2026 tests show it does not reliably beat detectors: Originality.ai still flagged its rewrites at 71-88% AI and GPTZero was near a coin flip, so always test your own content. Multiple user |
Use the same input
A content lead must set up both detection for incoming drafts and a humanizing pass for their own AI-assisted copy.
What a successful result must preserve
The tool must match the real job (auditing vs rewriting) and the budget must be based on current list pricing, not directory memory.
Evidence and test status
Specification comparison based on published pricing and feature pages plus independent test results, checked October 2026. We did not run a hands-on test on either tool; no quality winner is declared.
- DetectGPT — AI Detector - AI Checker For Teachers, Students & Writers ↗
- Undetectable AI — Official website ↗ (reviewed 2026-10-24)