# undb: Free Open Source Alternative to Firebase, Stackby, Supabase

Canonical: https://caniforkit.com/fork/undb
Last updated: 2026-11-07

undb (Open Source, Open Source) replaces Firebase, Stackby, Supabase. Build and manage custom databases with ease, create type-safe APIs, and develop applications quickly

## Tool Specifications
- **Tool Name**: undb
- **Type**: Open Source Project
- **License**: Open Source
- **Official Website**: https://undb.io
- **GitHub Repository**: https://github.com/undb-io/undb
- **GitHub Stars**: ★ 3k
- **Runs On**: Self-host
- **Maintenance Status**: nov 2026
- **Platforms**: web, self-hosted, docker to self-host
- **Data Storage**: All application data and configuration live on your own server or local database.
- **Installation**: Clone https://github.com/undb-io/undb or deploy with Docker Compose
- **Setup Requirements**: Deploy via Docker or binary release from GitHub and configure environment variables.
- **The Catch / Limitation**: Requires self-hosting setup, updates, and server maintenance compared to managed Firebase.

## Paid SaaS Applications Replaced (3)
Replacing these paid tools with undb saves up to $65/mo ($780/yr) in software subscriptions:

| Replaced Software | Category | SaaS Price | Comparison Guide |
| --- | --- | --- | --- |
| [Firebase](https://caniforkit.com/firebase) | [dev tools](https://caniforkit.com/category/dev-tools) | $25/mo | [Compare Firebase vs undb](https://caniforkit.com/vs/firebase-vs-undb) |
| [Stackby](https://caniforkit.com/stackby) | [forms](https://caniforkit.com/category/forms) | $15/mo | [Compare Stackby vs undb](https://caniforkit.com/vs/stackby-vs-undb) |
| [Supabase](https://caniforkit.com/supabase) | [dev tools](https://caniforkit.com/category/dev-tools) | $25/mo | [Compare Supabase vs undb](https://caniforkit.com/vs/supabase-vs-undb) |

## Frequently Asked Questions

### Is undb free and open source?
undb is an open source tool licensed under Open Source that runs on self-host. Build and manage custom databases with ease, create type-safe APIs, and develop applications quickly

### What is the trade-off or limitation of using undb?
Requires self-hosting setup, updates, and server maintenance compared to managed Firebase.

## Related

- [Self-Hosted Open Source Directory](https://caniforkit.com/self-hosted)
- [All Paid SaaS Alternatives Index](https://caniforkit.com/alternatives)
- [Software Categories Directory](https://caniforkit.com/categories)
- [Homepage](https://caniforkit.com)