kitio.aiCapacities vs Stacks
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Stacks has the lower starting price: about $9 a month, against $10 for Capacities.
At a glance
Best for
Category
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Typed objects
- Linked notes
- Daily notes
- AI assistant
- Calendar integration
- Bookmarks, notes and files in one place
- Collections and tags
- Public or private sharing
- Real-time collaboration
- Personal AI assistant
| Feature | Capacities | Stacks |
|---|---|---|
| Best for | Object-based notes app for building a personal knowledge base | Personal AI workspace for links, notes and files |
| Category | Productivity | Productivity |
| Pricing model | Freemium | Paid |
| Starting price | $9.99/mo | $9/mo |
| Free plan | Yes | No |
| Made by | Capacities | Better Stacks |
| Based in | Germany | India |
| Rating | No ratings yet | No ratings yet |
| Key features |
|
|
Pricing compared
Stacks has the lower starting price: about $9 a month, against $10 for Capacities.
Free plan
Cheapest paid plan
Top plan
Free trial
3 plans
Basic
Free
- Free forever
- Full-text search and offline support
- 5 GB media uploads, then 100 MB/month
Pro
$9.99/mo
- AI assistant
- Whiteboards and task management
- Smart queries
- Unlimited media uploads
Believer
From $12.49/mo
- Everything in Pro
- Beta access to major new features
- Supports the independent team
3 plans
Be Productive
$9/mo
- One user
- Unlimited collections and tags
- 50GB storage
Be Collaborative
$29/mo
- Unlimited users and shared workspaces
- Roles and permissions
- 500GB storage
Be Creative
$39/mo
- Unlimited public collections
- Everything in Be Collaborative
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
Capacities
- Clear structure without folders
- Generous free plan
- Good for long-term notes
- Object model takes time to learn
- AI only on paid plans
Stacks
- Replaces several saving tools
- Control over what is public
- Unlimited collections and tags
- No free plan mentioned
- Team features cost more
- Storage caps by plan
Which one should you choose?
Choose Capacities if you want:
- Clear structure without folders
- Generous free plan
- Good for long-term notes
Watch out: object model takes time to learn.
Choose Stacks if you want:
- Replaces several saving tools
- Control over what is public
- Unlimited collections and tags
Watch out: no free plan mentioned.
Capacities vs Stacks FAQ
What is the difference between Capacities and Stacks?
Capacities: Object-based notes app for building a personal knowledge base. Stacks: Personal AI workspace for links, notes and files. Both are productivity tools.
Is Capacities or Stacks cheaper?
Stacks has the lower starting price: about $9 a month, against $10 for Capacities.
Do Capacities and Stacks have free plans?
Capacities: Yes. Stacks: No.
Who makes Capacities?
Capacities is made by Capacities, based in Germany.
Who makes Stacks?
Stacks is made by Better Stacks, based in India.
Which should I choose, Capacities or Stacks?
Choose Capacities if you value clear structure without folders and generous free plan. Choose Stacks if you value replaces several saving tools and control over what is public.