Unleash / Flagsmith

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

The 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.

Replaces

LaunchDarkly

Replace LaunchDarkly

Estimated SaaS saved

$2,400

per year, small team, before lock-in

Start on Railway

Sponsor this stack Tip jar

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

The stack

Unleash
Open-source feature-management platform
Flagsmith
Open-source flags, remote config, and experiments

Cost table

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

Agent setup 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.

Also as markdown: /stacks/unleash-flags.md

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.