Hoppscotch
Mattermost
| Feature | Hoppscotch | Mattermost |
|---|---|---|
| Pricing | Free / from $7/mo | Free / from $10/mo |
| Free Plan | ✓ Yes | ✓ Yes |
| Rating | 4.5 / 5 | 4.2 / 5 |
| Best For | developers, open-source-teams, api-testing, lightweight-alternative | devops-teams, security-conscious-orgs, government, enterprise |
| Founded | 2019 | 2015 |
| Rest Client | ✓ | ✗ |
| Graphql Client | ✓ | ✗ |
| Websocket Testing | ✓ | ✗ |
| Collections | ✓ | ✗ |
| Environments | ✓ | ✗ |
| Team Collaboration | ✓ | ✗ |
| Self Hostable | ✓ | ✗ |
| Messaging | ✗ | ✓ |
| Channels | ✗ | ✓ |
| Playbooks | ✗ | ✓ |
| Integrations | ✗ | ✓ |
| Self Hosting | ✗ | ✓ |
| Compliance | ✗ | ✓ |
✓ Hoppscotch Pros
- Open-source and self-hostable
- Lightweight and fast (browser-based, no download)
- Supports REST, GraphQL, WebSocket, SSE, Socket.IO
- Team collaboration with shared collections
✗ Hoppscotch Cons
- Fewer features than Postman for enterprise use
- Limited mock server capabilities
- Desktop app less mature than web version
✓ Mattermost Pros
- Self-hostable
- Open source
- DevOps integrations
- Secure
✗ Mattermost Cons
- Smaller ecosystem
- Fewer integrations than Slack
- Self-hosting complexity
The Verdict
Hoppscotch is built for developers and open source teams, with a focus on rest-client and graphql-client. Mattermost targets devops teams and security conscious orgs and leads with messaging and channels.
Pricing is close: Hoppscotch starts at $7/mo versus $10/mo for Mattermost — not a deciding factor on its own.
Both offer free plans, so you can test each with your real workflow before committing to a subscription.
Feature-wise, Hoppscotch offers broader built-in capabilities (7 features vs 6), while Mattermost takes a more focused approach — which can mean a simpler, faster onboarding experience.
Bottom line: Hoppscotch has a slight overall edge — but if self-hostable matters most to you, Mattermost may still be the right call.