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.

The short answer

Cheaper paid plan: Undetectable AI — $9.99/mo vs $15.82/mo for Write Tone
Free plan: Both have one
Public API: Both have one
Best fit: Undetectable AI: Marketers cleaning up bulk LLM drafts before publishing · Write Tone: Students and writers who want paraphrasing plus grammar checking in one subscription
Trust score: About even — Undetectable AI 89, Write Tone 85

From our own records as of each tool's last check. Anything we have not confirmed is left out rather than guessed. How we verify

Undetectable AIRewrites machine-written drafts to read human, with detection scoring built in

Write ToneParaphraser, grammar checker and AI-text humaniser bundled with about 30 small writing tools.

Side by side

Fact	Undetectable AI	Write Tone
Category	AI Detection & Humanizers	AI Writing Assistants
Pricing model	Freemium	Freemium
Starts at	$9.99/mo	$15.82/mo
Public API	Yes	Yes
Trust score	89 / 100	85 / 100
Platforms	Web, API, Chrome extension	Web, Chrome extension, API
Company	Undetectable Inc.	Ibranext Technologies
Launched	2023	2023
Last verified	Oct 15, 2026	Oct 16, 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