# Unleash / Flagsmith

Feature flags you host. Unleash and Flagsmith replace LaunchDarkly without the service-connection and MAU meter.

**Replaces:** LaunchDarkly

**Tier:** Easy

## Problem

LaunchDarkly Foundation bills $10 per service connection per month and $8.33 per 1,000 client-side MAU. Unleash is AGPL feature management. Flagsmith is BSD-3-Clause flags, remote config, and experiments — both self-hostable.

## Stack

- [Unleash](https://www.getunleash.io) — Open-source feature-management platform
- [Flagsmith](https://www.flagsmith.com) — Open-source flags, remote config, and experiments

## Estimated SaaS cost saved

| You stop paying | Typical / year | Self-host instead |
|---|---:|---|
| LaunchDarkly Foundation overage | $2,400 | Unleash or Flagsmith + Postgres |

**About $2,400 / year** on a small team, before you count lock-in.

## Deploy on Railway

Placeholder: Unleash or Flagsmith + Postgres. SDKs stay in the apps; this box is the control plane.

[Start on Railway](https://c17.io/go/railway/unleash-flags?from=%2Fstacks%2Funleash-flags.md)

## AGENT_PROMPT

```
Replace LaunchDarkly with Unleash (preferred) or Flagsmith.

- Postgres. Create one flag, one environment, wire one SDK. Bind HTTP to 0.0.0.0:$PORT.
- Restrict admin. Write AGENT_PROMPT.md and a note on service-connection vs hosting cost.
```

## FAQ

### Unleash or Flagsmith?

Unleash if you want the older, widely-integrated flag service. Flagsmith if you also want remote config and experiments under a BSD license. Pick one control plane.

Source: https://c17.io/stacks/unleash-flags