kitio.aiDioptra vs Spellbook
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Dioptra starts at $450/mo and Spellbook starts at See pricing page. Check both pricing pages for current plans.
At a glance
Best for
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Redlines in Word
- Playbook distillation
- Term search
- Issues lists and risk summaries
- Legal AI assistant
- Prompt library
- Redline suggestions
- Clause benchmarking
- Review playbooks
- Contract drafting
- Agent mode
| Feature | Dioptra | Spellbook |
|---|---|---|
| Best for | AI contract redlining inside Microsoft Word for legal teams | AI contract drafting and review add-in for Microsoft Word |
| Category | Legal, finance & HR | Legal, finance & HR |
| Pricing model | Free trial | Free trial |
| Starting price | $450/mo | See pricing page |
| Free plan | No, 7-day trial | No, 7-day trial |
| Made by | Dioptra | Spellbook |
| Based in | – | Canada |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Dioptra starts at $450/mo and Spellbook starts at See pricing page. Check both pricing pages for current plans.
Free plan
Cheapest paid plan
Top plan
Free trial
3 plans
Starter
$450/mo
- Market playbooks and prompt library
- No training on your data
- 7-day free trial
Teams
From $4,200/yr per seat
- Per seat
- Team prompt library
- Customized onboarding plan
Enterprise
Contact sales
- 30-day guided ROI program
- Playbook building services
Prices in USD, checked Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Dioptra
- Works inside Microsoft Word
- Builds playbooks from your contracts
- No training on your data
- Starter costs $450 per month
- Team pricing is per seat per year
- Now part of Icertis
Spellbook
- Works inside Word
- Good fit for transactional lawyers
- Market data for negotiations
- Pricing not listed publicly
- Focused on contracts, not litigation
- Needs Word desktop or web
Which one should you choose?
Choose Dioptra if you want:
- Works inside Microsoft Word
- Builds playbooks from your contracts
- No training on your data
Watch out: starter costs $450 per month.
Choose Spellbook if you want:
- Works inside Word
- Good fit for transactional lawyers
- Market data for negotiations
Watch out: pricing not listed publicly.
Dioptra vs Spellbook FAQ
What is the difference between Dioptra and Spellbook?
Dioptra: AI contract redlining inside Microsoft Word for legal teams. Spellbook: AI contract drafting and review add-in for Microsoft Word. Both are legal, finance & hr tools.
Is Dioptra or Spellbook cheaper?
Dioptra starts at $450/mo and Spellbook starts at See pricing page. Check both pricing pages for current plans.
Do Dioptra and Spellbook have free plans?
Dioptra: No, 7-day trial. Spellbook: No, 7-day trial.
Who makes Dioptra?
Dioptra is made by Dioptra.
Who makes Spellbook?
Spellbook is made by Spellbook, based in Canada.
Which should I choose, Dioptra or Spellbook?
Choose Dioptra if you value works inside microsoft word and builds playbooks from your contracts. Choose Spellbook if you value works inside word and good fit for transactional lawyers.