Grammarly vs Spellbook
Plans, free access, limits and intended use side by side, taken from each vendor’s own pages. No score and no winner: the facts show where the two differ.
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Real-time grammar, tone and AI writing help inside the apps where you already type.
AI contract review, redlining and drafting inside Microsoft Word, priced per seat by quote
- Free access
- Grammarly: Free access
- Spellbook: Free trial only
- Paid from
- Grammarly: USD 12 per member per month
- Spellbook: No fixed price listed
- Plans listed
- Grammarly: 3
- Spellbook: 4
- Public API
- Grammarly: Not confirmed
- Spellbook: Not confirmed
Where Grammarly and Spellbook differ
- AccessGrammarly offers free access, while Spellbook offers a free trial only.
- Pricing checkPrices confirmed for Grammarly; prices not confirmed for Spellbook.
- PlansGrammarly lists 3 plans and Spellbook lists 4.
Head to head
Each value from the tool’s profile and the vendor’s own pages
| Grammarly | Fact | Spellbook |
|---|---|---|
| Access and price | ||
| Free access availableFree · USD 0 | Free accessDiffers | Free trial only |
| USD 12 per member per monthPro · billed yearly · USD 30 billed monthly | Lowest listed paid plan | No fixed price listed |
| Free plan; Pro from USD 12; Enterprise custom | Pricing model | No public prices; per-seat quote, 7-day free trial |
| 3 | Plans listedDiffers | 4 |
| Not confirmed | Public API | Not confirmed |
| Not confirmed | Card to start | Not confirmed |
| Not confirmed | Open source | Not confirmed |
| What it is for | ||
| Correcting and polishing everyday writing | Built for | Transactional lawyers and in-house legal teams who review and draft contracts in Word |
| Writing & content | CategorySame | Writing & content |
| Platforms |
|
| Works with |
|
| How current | ||
| Profile sources checked | ||
| Prices confirmed · Sep 26, 2026 | Pricing checkDiffers | Prices not confirmed · Oct 17, 2026 |
Official source check for both tools. No hands-on testing and no score: “Differs” marks a documented difference, not a better tool.
Plans and prices
Grammarly
Prices confirmed · Sep 26, 2026- FreeUSD 0EUR 0 shown
- ProUSD 12 per member per monthbilled yearly · USD 30 billed monthly
- EnterpriseContact provider
Spellbook
Prices not confirmed · Oct 17, 2026- Law firmsNot published; per-seat quote
- In-house teamsNot published; per-seat quote
- Free trialUSD 0 for 7 days
- AcademicFree until the end of 2026
Strengths and limits
Grammarly
Strengths
- Works where you already write: The same suggestions run in browser extensions, desktop apps, Office and Google Docs add-ins and mobile keyboards.
- Usable free tier: Free has no time limit and includes spelling, grammar, tone detection and a monthly prompt allowance.
- Flexible Pro billing: Pro can be paid monthly, quarterly or yearly per member, and a team account can grow to 149 seats.
Limits to plan around
- Refunds only where law requires: You can cancel at any time, but paid time is refunded only when local law requires it.
- Review agents are paid: Plagiarism Checker, AI Detector and Citation Finder need Pro, and Free gets a single AI Grader scan a day.
- Own rewrites can trip the detector: Text rewritten by Grammarly's agents is likely to be flagged by its AI Detector.
Spellbook
Strengths
- Works where lawyers already edit: The Review page puts redlines and comments inside Microsoft Word, so there is no separate document upload step.
- Your standards, reused: The Review page says playbooks save how you want a document reviewed, and the pricing page lists a playbook build service for in-house teams.
- Review plus research in one place: The Ask page says the same workflow covers asking what the law requires, citing the source and applying the answer as a redline.
Limits to plan around
- No public prices: The pricing page shows no amounts; it says pricing depends on the number of team members on a licence and sends you to a demo.
- Not legal advice: Terms section 5.4 says the customer will not rely solely on output as formal legal advice and will have it checked by a licensed lawyer when appropriate.
- Spellbook may keep a copy for 90 days: The Terms let Spellbook keep inputs and outputs for quality assurance for up to 90 days, which is separate from the zero retention it requires of its model providers.
See both products
Start from your task, not from a winner.
Run both tools on the same real task, then compare the result, how much editing it needs and how fast it uses your plan’s allowance.
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Comparing tools from different categories is fine, and often useful — a writing assistant and a research tool solve different halves of the same job. The table will show you exactly where they diverge.
Questions about comparing tools
How does the comparison work?
Add two tools to the comparison tray from any tool card, then open this page. The table pulls each tool's verified plan details, platforms, strengths and limits from its profile, so both columns carry the same kind of evidence, with a separate source-check date for each tool.
Do you declare a winner?
No. The table sets two tools against each other on documented facts, not on a score. Which one wins depends on your task, your budget and your usage volume — three things we cannot see from here.
Why are some cells empty or marked unverified?
Because we could not confirm that detail on the vendor's own pages. Rather than filling the gap with a figure from elsewhere, we mark it and say why on the tool's profile.
Can I compare more than two tools?
Not at once. Two columns keep the differences readable and force a real decision. Remove either selected tool to replace it, or clear both to start a new pair.
Every figure in the table above comes from the linked profile, where the source and the verification date are listed. Browse all tools or read the editorial policy.