Lex vs Writefull
Lex
lex.pageWritefull
writefull.comSide by side
| Figure | Lex | Writefull |
|---|---|---|
| Price from | $14.99/mo | $12.50/mo |
| Free plan | Yes | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | — | Yes |
| macOS | — | Yes |
| iOS | Yes | — |
| API | Yes | Yes |
| Plans published | 4 | 7 |
| Spec score · Writing Assistants Software | 9.0 (#4) | 8.7 (#10) |
| Spec score · AI writing assistants | 8.7 (#13) | 9.2 (#7) |
| API | Lex publishes a public API documentation site at docs.lex.page. | The Language API accepts batches of sentences or documents and returns corrections and quality metrics as JSON or Track Changes. |
| Browser extension | No | Yes |
| Free plan | Yes | Yes |
| Rating on G2 | 0.0 out of 5 from 0 reviews | 0.0 out of 5 from 0 reviews. |
| Security | Lex says it encrypts web requests with TLS, restricts and logs database access, requires two-factor authentication for infrastructure access, and backs up its database continuously. | Writefull says it uses technical and organizational measures to protect personal data from loss, unauthorized access, misuse, alteration, and disclosure. |
Plans
Lex
- FreeFree
- Lex Pro monthly$24.99 a month
- Lex Pro annual$179.88 a year
- Lex ProPrice not published
Writefull
- FreeFree
- FreeFree
- Premium$150 a year
- Premium$150 a year
- Group$285 a year
- Group$285 a year
- InstitutionPriced on request
In their own words
Writefull
Writefull provides AI language feedback, writing tools, and data insights for research writing. Its language models are trained on academic texts and suggest improvements to grammar, word use, style, and phrasing. Other tools can paraphrase, change style, split or join sentences, summarize or explain text, and generate titles and abstracts. Writefull integrates with Overleaf, offering LaTeX-tailored feedback, TeXGPT, and table and equation generators. Its Microsoft Word add-in works with Windows, Mac, and Word Online. The service is available on the web, Windows, macOS, and as a browser extension. The Overleaf extension supports Chrome, Chromium, and Brave; Writefull Revise supports Chrome, Firefox, Safari, and Chromium-based Edge. Revise returns edits through Track Changes and is limited to publishers and institutions. A free plan has limited quotas for language editing and rewriting. Writefull says it does not store users’ text, use text or interactions to train its AI, or sell data to third parties. Some features use third-party APIs, with user consent requested before text is sent.