MantisBT
Sentry
| Feature | MantisBT | Sentry |
|---|---|---|
| Pricing | Free / from $4.95/mo | Free / from $26/mo |
| Free Plan | ✓ Yes | ✓ Yes |
| Rating | 3.9 / 5 | 4.5 / 5 |
| Best For | developers, small-teams, open-source-projects, budget-conscious-teams | developers, frontend-teams, mobile-developers, startups |
| Founded | 2000 | 2012 |
| Bug Tracking | ✓ | ✗ |
| Custom Fields | ✓ | ✗ |
| Email Notifications | ✓ | ✗ |
| Role Management | ✓ | ✗ |
| Plugins | ✓ | ✗ |
| Time Tracking | ✓ | ✗ |
| Error Tracking | ✗ | ✓ |
| Performance Monitoring | ✗ | ✓ |
| Session Replay | ✗ | ✓ |
| Source Maps | ✗ | ✓ |
| Release Tracking | ✗ | ✓ |
| Alerting | ✗ | ✓ |
| Integrations | ✗ | ✓ |
| Issue Triaging | ✗ | ✓ |
✓ 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
✓ Sentry Pros
- Excellent error tracking with full stack traces
- Source map support for minified code
- Session replay shows exactly what users experienced
- Open-source self-hosted option available
- Supports 100+ platforms and frameworks
✗ Sentry Cons
- Event quotas can be exceeded during incidents
- Alert fatigue if not properly configured
- Performance monitoring less mature than Datadog
The Verdict
MantisBT is built for developers and small teams, with a focus on bug-tracking and custom-fields. Sentry targets developers and frontend teams and leads with error-tracking and performance-monitoring.
On pricing, MantisBT is the clear winner for budget-conscious users — starting at $4.95/mo compared to $26/mo for Sentry. That $21.05/mo difference adds up quickly for growing teams.
Both offer free plans, so you can test each with your real workflow before committing to a subscription.
Sentry edges out on user ratings (4.5 vs 3.9). While both are well-regarded, that gap reflects real differences in user satisfaction worth considering.
Feature-wise, Sentry offers broader built-in capabilities (8 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: Sentry has a slight overall edge — but if free and open-source matters most to you, MantisBT may still be the right call.