AI Undetectable vs Frase
Both are in AI content tools. Here is how their plans, prices and features compare, taken from each vendor's own site.
The main differences
- AI Undetectable's cheapest paid plan is $5/mo, against $39/mo for Frase.
| AI Undetectable | Frase | |
|---|---|---|
| Starting price | from $5/mo | from $39/mo |
| Free plan | Not stated by the vendor | No |
| Free trial | Yes | Yes |
| Plans | 10K words ($9.99/mo, $5/mo annual, $60/yr); 20K words ($19/mo, $9.50/mo annual, $114/yr); 35K words ($31/mo, $15.75/mo annual, $189/yr) | Starter ($49/mo, $39/mo annual); Professional ($129/mo, $103/mo annual); Scale ($299/mo, $239/mo annual) |
| Fees and pricing notes | None stated | None stated |
| Best for | Creators | Not stated |
| Key features | AI text detector that estimates how machine-written a passage looks; Two rewrite modes: Basic and a deeper Stealth rebuild; Image detector for uploaded images or image links; Five writing modes: general, essays, articles, marketing copy and stories | Articles and audit pages each month by plan; SEO and GEO scores; AI Visibility on ChatGPT and Google AI (Perplexity on Professional); Content Guard watches pages for Google decay |
| Checked on | 2026-10-08 | 2026-10-03 |
Prices change; confirm on the vendor's site before you buy. Full details and sources are on each tool's page.
AI Undetectable
- 3-day free trial on every plan
- Yearly billing is about 50% cheaper
- Detector and rewriter in one workspace
Trade-offs
- No free plan, and the selected plan is billed after the trial unless cancelled
- Monthly word allowances do not roll over
- Detector scores are estimates, not proof of how a text was written
Frase
- Free 7-day trial with no credit card
- Yearly billing saves 20%
- Plans for solos, in-house teams and agencies
Trade-offs
- Starter covers 1 seat, 1 site and 10 articles a month
- Professional extra seats are $29 a month
- Month-to-month pricing is higher: $49, $129 and $299