Best Open Source Backend-as-a-Service Platforms in 2026
Best Open Source Backend-as-a-Service Platforms in 2026
Firebase's Blaze plan charges for every read, write, and function invocation. Supabase Pro costs $25/month. Here are the best open source BaaS platforms you can self-host with predictable costs.
Quick Comparison
| Tool | Database | Auth | Storage | Realtime | License | Stars |
|---|---|---|---|---|---|---|
| Supabase | PostgreSQL | ✅ | ✅ | ✅ | Apache-2.0 | 73K+ |
| Appwrite | MariaDB | ✅ | ✅ | ✅ | BSD-3 | 45K+ |
| PocketBase | SQLite | ✅ | ✅ | ✅ | MIT | 41K+ |
| Nhost | PostgreSQL | ✅ | ✅ | ✅ (Hasura) | MIT | 8K+ |
| Directus | Any SQL | ✅ | ✅ | ✅ | GPL-3.0 | 28K+ |
Detailed Breakdown
Supabase — Best Overall
Replaces: Firebase
- PostgreSQL with REST and GraphQL APIs
- Row Level Security
- Edge Functions (Deno)
- Auth with 20+ providers
- Real-time subscriptions
- Storage with CDN
- Dashboard (Studio)
- Excellent documentation
Best for: Production applications that need a PostgreSQL-backed, scalable backend.
Resource: 4-8 GB RAM (multiple services).
Appwrite — Best Developer Experience
Replaces: Firebase
- Document database (MariaDB)
- SDKs for 10+ platforms
- Auth with 30+ providers
- Functions (Node, Python, PHP, Ruby, etc.)
- Storage with image manipulation
- Real-time events
- Console UI
- Self-hosted or cloud
Best for: Developers who want the best SDK experience across platforms.
Resource: 4 GB RAM.
PocketBase — Best for Prototyping
Replaces: Firebase (for small apps)
- Single Go binary (5 MB)
- SQLite database
- Built-in auth
- File storage
- Real-time subscriptions
- Admin UI
- JavaScript/Dart SDK
- No Docker needed
Best for: Side projects, MVPs, and small apps. Deploy in seconds.
Resource: 128 MB RAM.
Directus — Best for CMS
Replaces: Contentful, Strapi
- Wraps any SQL database
- Auto-generated REST and GraphQL API
- Beautiful admin app
- Custom flows (automation)
- Access control
- Headless CMS capabilities
Best for: Content-driven apps that need a flexible admin interface.
Resource: 2 GB RAM.
Choosing the Right Tool
| Need | Choose |
|---|---|
| Full Firebase replacement | Supabase or Appwrite |
| Fastest prototyping | PocketBase (single binary) |
| PostgreSQL + SQL | Supabase |
| Best SDKs | Appwrite |
| Headless CMS | Directus |
| Minimum resources | PocketBase (128 MB) |
| GraphQL-first | Nhost (Hasura) |
Cost Comparison
| Scale | Firebase (Blaze) | Self-Hosted Supabase | Self-Hosted PocketBase |
|---|---|---|---|
| 1K MAU | ~$25/month | $8/month (VPS) | $5/month (VPS) |
| 10K MAU | ~$100/month | $8/month | $5/month |
| 100K MAU | ~$500+/month | $24/month | $12/month |
Compare all BaaS platforms on OSSAlt — databases, SDKs, and pricing side by side.