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Undetectable AI vs Write Tone

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors. Undetectable AI starts at $9.99, Write Tone at $15.82. Both have a free tier. Both ship a public API.

Undetectable AIRewrites machine-written drafts to read human, with detection scoring built inWrite ToneParaphraser, grammar checker and AI-text humaniser bundled with about 30 small writing tools.

Side by side

FactUndetectable AIWrite Tone
CategoryAI Detection & HumanizersAI Writing Assistants
Pricing modelFreemiumFreemium
Starts at$9.99 month$15.82 month
Public APIYesYes
PlatformsWeb, API, Chrome ExtWeb, Chrome Ext, API
CompanyUndetectable Inc.Ibranext Technologies
Launched20232023
Last verifiedSep 6, 2026Sep 6, 2026

What our research says

Undetectable AI

Buy it only if you accept that passing a detector is a moving target: detector vendors retrain constantly, and text that cleared last month can flag next month. As a multi-format detection dashboard it is more defensible than as a bypass tool.

Pros

  • Detector and rewriter run in one pass, so you see which sentences changed and why
  • Coverage extends past text into image, voice, video and document classifiers
  • Browser extension works inside Docs and Gmail rather than a separate tab
  • Entry tier is genuinely cheap at annual rates

Cons

  • Rewrites often flatten voice and add filler to break statistical patterns
  • Detection on short passages is unreliable in both directions
  • Word quotas drain fast because rejected attempts still consume them
  • The free trial caps at 250 words, barely enough to judge output quality

Write Tone

Good value if you actually use several of the tools - unlimited paraphrasing, grammar checking and summarising for about $16 a month undercuts buying them separately. The honesty problem is that the same subscription sells plagiarism detection and a detector-evasion rewriter side by side, which tells you who the real customer is. Treat the 637,000-user claim as marketing.

Pros

  • Around 90 tone presets on the paraphraser, across 50+ languages
  • Grammar checking, summarising and plagiarism checking included in the same plan
  • Chrome extension and Microsoft Word integration, not web-only
  • Documented API endpoint for programmatic access
  • Free tier is a real 100,000 characters a month rather than a trial

Cons

  • Sells detector-evasion and plagiarism detection in the same subscription
  • No company country or registered address published
  • Free tier carries ads and throttles the humaniser and summariser
  • Tool count is inflated by many near-identical single-purpose pages

Which one fits

Choose Undetectable AI if you need

  • Marketers cleaning up bulk LLM drafts before publishing
  • Editors wanting a second opinion on submitted copy
  • Teams screening images and audio for synthetic origin
  • Non-native writers smoothing register and tone

Choose Write Tone if you need

  • Students and writers who want paraphrasing plus grammar checking in one subscription
  • Non-native writers adjusting tone across many languages
  • People who want a Chrome extension rather than another browser tab

More comparisons

All Undetectable AI alternatives →All Write Tone alternatives →Browse all AI Detection & Humanizers →