AI Undetectable vs Writesonic
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 $79/mo for Writesonic.
| AI Undetectable | Writesonic | |
|---|---|---|
| Starting price | from $5/mo | from $79/mo |
| Free plan | Not stated by the vendor | Not stated by the vendor |
| 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 ($79/mo annual); Basic ($199/mo annual); Growth ($399/mo annual); Enterprise (Custom pricing) |
| 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 | Track a brand across ChatGPT, Gemini and Google AI Overviews; AI articles each month; Site audits; Sentiment analysis (Growth and up) |
| 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
Writesonic
- Free trial with no credit card needed
- Includes 15 to 50 AI articles a month
- Annual billing saves $240 to $1,200 a year
Trade-offs
- Starts at $79 a month, billed annually
- Positioned as an AI search tool, not just a writing tool
- Starter allows 1 user and 1 project