Top 12 Open-Source Alternatives to Flagsmith

Flagsmith

Flagsmith lets you manage feature flags and remote config across web, mobile and server side applications. Deliver true Continuous Integration. Get builds out faster. Control who has access to new features. We're Open Source.

As Flagsmith is an open source project, you can find more open source alternatives and stats on LibHunt.

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Product categories

Developer Tools Feature Flags A/B Testing Release Management Configuration Management Feature Toggles Software Development Backend As A Service Realtime Backend / API Remote Configuration Web Analytics Analytics

Summary

The top open-source alternatives to Flagsmith are Unleash, Split.io, and Growth Book. One of the criteria for ordering this list is the number of mentions that products have on reliable external sources. You can suggest additional sources through the form here.

Unleash Landing Page
1

Unleash

Unleash is an open-source feature management platform. We are private, secure, and ready for the most complex setups out of the box.
Pricing:
- Open Source
- Freemium
- Free Trial
- $75 / Monthly ("Enterprise Pay-as-you-go", "5 users")
#Productivity #Software Development #Release Management 4 social mentions
Split.io Landing Page
2

Split.io

In a world where product development teams are pressured to do more with less, Split’s Feature Data Platform™ gives you the confidence to move fast without breaking things.
Pricing:
- Open Source
#A/B Testing #Configuration Management #Developer Tools 12 social mentions
Growth Book Landing Page
3

Growth Book

The Open Source A/B Testing Platform
Pricing:
- Open Source
#Web Analytics #A/B Testing #Conversion Optimization 1 social mentions
PostHog Landing Page
4

PostHog

An open source suite of product and data tools including product analytics, feature flags, session replay, A/B testing, surveys, and more.
Pricing:
- Open Source
- Freemium
#Web Analytics #A/B Testing #Mobile Analytics 75 social mentions
FlipperCloud.io Landing Page
5

FlipperCloud.io

Deploy anytime without fear.
Pricing:
- Open Source
- Freemium
- Free Trial
- $49 / Monthly (10 users)
#Release Management #Developer Tools #Feature Flags
FeatureHub Landing Page
6

FeatureHub

Cloud native feature flags, A/B testing and remote configuration service
Pricing:
- Open Source
- Paid
- Free Trial
- $4.99 / Monthly (1 user)
#A/B Testing #Release Management #Developer Tools
Replane Landing Page
7

Replane

Stop deploying code to change settings. Self-hosted config management with version history, instant rollback, and realtime updates.
Pricing:
- Open Source
- Freemium
#Software Development #Configuration Management #Developer Tools 1 social mentions
Rollout Landing Page
8

Rollout

Fix or prevent critical bugs while your app is live.
Pricing:
- Open Source
#A/B Testing #Release Management #Developer Tools
A/BBY for Next.js Landing Page
9

A/BBY for Next.js

A/B Testing & Effortless Feature Flags for Next.js
Pricing:
- Open Source
#A/B Testing #Open Source #Feature Flags
ConfigDirector Landing Page
10

ConfigDirector

Feature flags and remote config that catch mistakes before your users do. Typed values, JSON Schema validation, safe renames, gradual rollouts, alerts, audit log. SDKs, OpenFeature providers, Terraform, MCP. Free plan, unlimited seats, no card.
Pricing:
- Open Source
- Freemium
- Free Trial
- $29 / Monthly (500K client sessions, unlimited seats, projects, and configs)
#Software Development #A/B Testing #SaaS
Supabase Landing Page
11

Supabase

An open source Firebase alternative
Pricing:
- Open Source
#Realtime Backend / API #Backend As A Service #Web Frameworks 557 social mentions
Nhost Landing Page
12

Nhost

Firebase alternative (open-source) with GraphQL
Pricing:
- Open Source
#Cloud Computing #Realtime Backend / API #Backend As A Service 52 social mentions