Grammarly AI vs Writefull
A detailed comparison to help you choose between Grammarly AI and Writefull.
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Verdict: Grammarly AI wins
Grammarly AI scores 4.3/5, edging out Writefull at 4.1/5. Professionals and students who want one assistant that improves everything they type, everywhere they type it.
Grammarly AI AI writing assistant trusted by millions | Writefull AI language feedback for academic writing | |
|---|---|---|
| Rating | 4.3 (1 review) | 4.1 (1 review) |
| Pricing Model | freemium | freemium |
| Starting Price | Free tier available | Free tier available |
| Best For | Professionals and students who want one assistant that improves everything they type, everywhere they type it. | Non-native and native English-speaking researchers and students who want AI language feedback tuned to scientific manuscripts inside Word or Overleaf. |
| Free Tier | ||
| API Access | ||
| Team Features | ||
| Open Source | ||
| Tags | free tierbrowser extensionteam features | free tier |
| Visit Grammarly AI → | Visit Writefull → |
Grammarly AI
Pros
- + The correction engine caught every mechanical error in my corrupted test sample, and Pro's sentence rewrites fixed wordy-but-not-wrong prose
- + Works in webmail, document editors and support forms with zero setup — corrections follow you across every text field
- + Tone detector gave a useful second opinion before sending sensitive messages in my testing
- + Team layer (style guide, brand tones, analytics) is mature enough for real organisational enforcement
- + Enterprise governance is real: SAML SSO, SCIM, DLP, BYOK, audit-log API, and a published SOC 2 (Type 2) attestation
Cons
- - Long-form generation is filler-level without heavy steering; there is no manuscript or article drafting workflow
- - Free tier's 100 AI prompts/month runs out fast if rewrites are part of every message; full-sentence rewrites are Pro-only
- - Per-member pricing scales steeply — ten seats at $12/member/month annually is $1,440/year before Enterprise
- - AI-text and plagiarism detectors are probabilistic signals, not verdicts; risky as academic evidence
- - Everything typed through the extension is processed by a third party, and the Superhuman-era corporate changes may reshape the product
Writefull
Pros
- + Trained on scientific text: in my testing it flagged three real grammar errors in a dense methods paragraph and raised zero false alarms on standard statistics shorthand
- + Language search returns example sentences from published papers — genuinely useful for choosing between two plausible phrasings
- + Lives where academics write: Word add-in and deep Overleaf integration (including AI Assist distribution via Digital Science)
- + Academic-specific widgets general tools lack: abstract generator, title generator, Supercomplete context completion
- + Free tier by default with a real annual option at $65.52/year at time of writing per writefull.com/pricing
Cons
- - English-only — its own models do not cover other languages
- - Revise and Cite come only with institutional licences, so individuals cannot get the complete suite
- - Published pricing is a time-limited launching offer (33% off); the stable rate is not yet established
- - Paraphrase suggestions occasionally flattened technical phrasing in my testing — batch-accepting them is a mistake
- - Billing runs through Gumroad, which surprises people checking their bank statement
Frequently Asked Questions
Which is better, Grammarly AI or Writefull?▼
Grammarly AI scores higher at 4.3/5 vs 4.1/5 for Writefull, making it the better-rated option in our comparison.
What is the difference between Grammarly AI and Writefull?▼
Grammarly AI: Writing assistant that checks grammar, spelling and tone in your browser, email and docs, with AI rewrites. Free plan; Pro adds full-sentence rewrites and plagiarism checks. Writefull: Writefull gives researchers and students AI feedback on academic writing: proofreading, paraphrasing and copy-editing, with widgets and versions for institutions and publishers.
Is Grammarly AI or Writefull more affordable?▼
Grammarly AI starts at €0/mo, Writefull starts at €0/mo. Check the comparison table above for current pricing.
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