MantisBT
Twenty
| Feature | MantisBT | Twenty |
|---|---|---|
| Pricing | Free / from $4.95/mo | Free only |
| Free Plan | ✓ Yes | ✓ Yes |
| Rating | 3.9 / 5 | 4.2 / 5 |
| Best For | developers, small-teams, open-source-projects, budget-conscious-teams | startups, developers, privacy-focused-businesses, open-source-enthusiasts |
| Founded | 2000 | 2023 |
| Bug Tracking | ✓ | ✗ |
| Custom Fields | ✓ | ✗ |
| Email Notifications | ✓ | ✗ |
| Role Management | ✓ | ✗ |
| Plugins | ✓ | ✗ |
| Time Tracking | ✓ | ✗ |
| Contacts Management | ✗ | ✓ |
| Pipeline | ✗ | ✓ |
| Email Integration | ✗ | ✓ |
| Custom Objects | ✗ | ✓ |
| Graphql Api | ✗ | ✓ |
| Calendar Sync | ✗ | ✓ |
| Task Management | ✗ | ✓ |
✓ MantisBT Pros
- Free and open-source
- Easy to set up
- Lightweight
- Extensible with plugins
✗ MantisBT Cons
- Dated interface
- Limited agile features
- Small community vs alternatives
✓ Twenty Pros
- Completely open-source and free to self-host
- Modern, beautiful UI rivaling paid CRMs
- Flexible data model with custom objects
- GraphQL API for developers
✗ Twenty Cons
- Young project with frequent breaking changes
- Fewer integrations than mature CRMs
- Self-hosting requires technical expertise
The Verdict
MantisBT is built for developers and small teams, with a focus on bug-tracking and custom-fields. Twenty targets startups and developers and leads with contacts-management and pipeline.
Twenty uses custom enterprise pricing, while MantisBT starts at $4.95/mo — a tangible advantage for teams with a fixed budget.
Both offer free plans, so you can test each with your real workflow before committing to a subscription.
Twenty edges out on user ratings (4.2 vs 3.9). While both are well-regarded, that gap reflects real differences in user satisfaction worth considering.
Feature-wise, Twenty offers broader built-in capabilities (7 features vs 6), while MantisBT takes a more focused approach — which can mean a simpler, faster onboarding experience.
Both tools are a solid fit for developers — in those cases, the decision often comes down to workflow style and how your team prefers to organize work.
Bottom line: Twenty has a slight overall edge — but if free and open-source matters most to you, MantisBT may still be the right call.