AI Undetectable vs Copy.ai
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 $29/mo for Copy.ai.
| AI Undetectable | Copy.ai | |
|---|---|---|
| Starting price | from $5/mo | from $29/mo |
| Free plan | Not stated by the vendor | Not stated by the vendor |
| Free trial | Yes | Not stated by the vendor |
| 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) | Chat ($29/mo); Enterprise (Quote, get a demo) |
| 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 | Unlimited words in Chat; Unlimited chat projects; Access to OpenAI, Anthropic and Gemini models; Workflows that chain research, content generation and tool integrations (Enterprise) |
| 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
Copy.ai
- Self-serve plan at $29 a month
- 5 seats included on Chat
- Several AI models in one place
Trade-offs
- The self-serve plan is aimed at small teams; workflows and credits are an Enterprise product
- Annual billing is 20% off, but the annual price was not shown
- No free plan or trial is stated on the pricing page