Side-by-side comparison · Writing & Translation
DeepL vs GPTZero vs Undetectable AI
Everything that matters when choosing between them, in one place: our rating, what each can do, what they cost, and the trade-offs.
Comparing 3 tools, the maximum.
At a glance
Pick it if: Businesses that sell, support or write in more than one language, and anyone who regularly translates documents.
Pick it if: Teachers, editors and business owners who want a second opinion on whether writing they've been handed came from AI.
Pick it if: Marketers and writers who use AI for first drafts and want them to sound less robotic.
Overview
| Attribute | DeepL | GPTZero | Undetectable AI |
|---|---|---|---|
| In one line | Translates text, whole documents and live conversations, with natural-sounding results. | Checks whether text was written by AI, with plagiarism and citation checks too. | Rewrites AI-written text so it reads more human and is less likely to get flagged. |
| Pricing model | Freemium | Freemium | Freemium |
| Starting price | $10.49/mo | $0 | $0 |
| Free plan | Yes | Yes | Yes |
| Works with Claude Code | Yes | Yes | Yes |
Rating breakdown
Our scores out of 5. The higher bar in each row is highlighted.
| Attribute | DeepL | GPTZero | Undetectable AI |
|---|---|---|---|
| Overall rating | 4.2 | 4.2 | 3.6 |
| Ease of useHow quickly someone non-technical gets value from it. | 5.0 | 4.5 | 4.0 |
| FeaturesHow completely it covers its own job, and how well the pieces fit together. | 4.5 | 4.5 | 3.5 |
| Output qualityHow good the results are before you fix them. | 4.0 | 3.5 | 3.0 |
| Value for moneyWhat you get for the price, including the free plan. | 3.5 | 4.0 | 3.5 |
| Speed & reliabilityHow fast it is and how often it falls over. | 4.0 | 4.5 | 4.0 |
Feature comparison
A tick means it does this today. A dash means we haven't checked.
| Attribute | DeepL | GPTZero | Undetectable AI |
|---|---|---|---|
| Access & platform | |||
| Free plan | Yes | Yes | Yes |
| Mobile app | Yes | No | No |
| Desktop app | Yes | – | – |
| Browser extension | Yes | Yes | Yes |
| API access | Yes | Yes | Yes |
| Teams & business | |||
| Team workspace | Yes | Yes | No |
| Enterprise plan or SSO | Yes | Yes | – |
| Connects to other apps | Yes | Yes | No |
| Open source or self-hosted | No | No | No |
| AI abilities | |||
| Works with your files | Yes | Yes | Yes |
| Understands images | Yes | – | Yes |
| Makes images | No | No | No |
| Makes video | No | No | No |
| Writes code | No | No | No |
| Runs agents or automations | No | No | No |
| Learns your brand or style | Yes | – | – |
| Works in many languages | Yes | Yes | Yes |
| Capabilities score | 12/ 17 | 8/ 17 | 6/ 17 |
Pricing
Plans as listed on each vendor's site when we last checked. Confirm before you buy.
| Attribute | DeepL | GPTZero | Undetectable AI |
|---|---|---|---|
| Plans | Free Free Occasional emails and short text. | Free $0 Checking the odd document. | Free $0 Testing one short piece. |
IndividualOur pick $10.49/mo, or $8.74/mo billed yearly One person translating most weeks. | PremiumOur pick $23.99/mo, or $12.99/mo billed yearly Teachers and editors checking work every week. | 10K words $9.99/mo, or $5/mo billed yearly ($60) Occasional use. | |
Team $34.49/user/mo, or $28.74/user/mo billed yearly Small teams sharing glossaries. | Professional $45.99/mo, or $24.99/mo billed yearly Agencies and heavy users scanning lots of files. | 20K wordsOur pick $19/mo, or $9.50/mo billed yearly ($114) Regular blog content. | |
Business $68.99/user/mo, or $57.49/user/mo billed yearly Teams translating all day. | Team Professional price per seat, 2 seats minimum Schools and businesses buying for a group. | Larger plans From $31/mo, or $15.75/mo billed yearly Agencies and high volume. | |
Enterprise Custom Large organisations with security reviews. | |||
| Which plan to pick | Start on Free. If you translate documents or customer emails every week, Individual on a yearly plan is the sweet spot and stops DeepL keeping your text. Move to Team only when several people need the same glossary. | Start on Free. If you check more than a few documents a week, Premium on yearly billing is the sweet spot. Professional only makes sense if you scan big batches of files. | Test the free 250 words on your own writing first. If the output works for you, a small yearly plan is cheap. Word credits reset monthly, so don't buy more than you use. |
Key features
| Attribute | DeepL | GPTZero | Undetectable AI |
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Pros and cons
| Attribute | DeepL | GPTZero | Undetectable AI |
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Who each one is for
| Attribute | DeepL | GPTZero | Undetectable AI |
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Questions people ask
Which is better, DeepL, GPTZero or Undetectable AI?
They tie on our overall rating (DeepL 4.2/5, GPTZero 4.2/5 and Undetectable AI 3.6/5). DeepL is best for Translating Word, PowerPoint and PDF files with layout kept and customer emails in another language. GPTZero is best for checking essays and assignments for AI writing and screening freelance or agency content. Undetectable AI is best for Making AI drafts sound less robotic and seeing how detectors might score your text.
Which is cheaper, DeepL, GPTZero or Undetectable AI?
DeepL: There's a free plan, and paid plans start at $10.49/mo. GPTZero: There's a free plan, and paid plans start at $0. Undetectable AI: There's a free plan, and paid plans start at $0.
Which is easier to use, DeepL, GPTZero or Undetectable AI?
DeepL rates highest for ease of use in our scores. Businesses that sell, support or write in more than one language, and anyone who regularly translates documents.
How we compare
Ratings are our own, from using each tool, across ease of use, features, output quality, value for money, speed & reliability.
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