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7 jobs · 20 apps

Best open source software for SaaS companies

For a SaaS company, a self-hosted stack starts with Supabase for backend and auth, Lago for usage-based billing and PostHog for product analytics.

The pieces a SaaS product needs around its own code: back end and auth, billing, product analytics, customer messaging, feedback, status pages and deployment.

Updated · data from GitHub, refreshed daily

Top picks

  1. Rank 1:

    Supabase

    supabase/supabase

    Postgres development platform with auth, realtime, storage and edge functions, the open-source Firebase alternative.

    Active · last commit Oct 28, 2026

    Low-code & BackendTypeScriptDocker

    Stands out for the most GitHub stars. Supabase has 114,226 GitHub stars, uses the Apache-2.0 license, ships a Docker image and had 6,324 commits in the last year; it replaces Firebase.

  2. Rank 2:

    Appwrite

    appwrite/appwrite

    End to end backend server for web, native, and mobile developers 🚀.

    Active · last commit Oct 28, 2026

    Low-code & BackendTypeScriptDocker

    Stands out for the most commits in the last 12 months (21,189). Appwrite has 57,786 GitHub stars, uses the BSD-3-Clause license, ships a Docker image and had 21,189 commits in the last year; it replaces Firebase and Supabase.

  3. Rank 3:

    Logto

    logto-io/logto

    Modern auth infrastructure with OIDC, SSO and multi-tenant support for SaaS and apps.

    Active · last commit Oct 28, 2026

    Identity & SSOTypeScriptDocker

    Logto has 14,806 GitHub stars, uses the MPL-2.0 license, ships a Docker image and had 1,429 commits in the last year; it replaces Auth0.

At a glance

Open source software for SaaS companies compared

Picked by hand for each job from apps whose own description or topics match it, in curated order inside each section, with GitHub data from October 2026; an app appears only once.

Top 10 picks compared, data as of Oct 28, 2026
AppStands out forLicenseGitHub starsCommits (12 mo)Last commitDocker image
Supabasethe most GitHub starsApache-2.0114,2266,324Oct 28, 2026Yes
Appwritethe most commits in the last 12 months (21,189)BSD-3-Clause57,78621,189Oct 28, 2026Yes
Logto–MPL-2.014,8061,429Oct 28, 2026Yes
ZITADEL–AGPL-3.015,457608Oct 28, 2026Yes
Lagothe newest codebase (created February 2022)AGPL-3.010,714199Oct 27, 2026Yes
Kill Bill–Apache-2.05,824220Oct 27, 2026Yes
HyperSwitch–Apache-2.045,4222,323Oct 28, 2026Yes
PostHog–MIT40,48641,124Oct 28, 2026No
Umami–MIT39,7421,417Oct 27, 2026Yes
Plausible Analytics–AGPL-3.029,700618Oct 28, 2026No

1 of 7 · 4 picks

Backend and auth

  1. 1

    Supabase

    Postgres development platform with auth, realtime, storage and edge functions, the open-source Firebase alternative.

    Stands out for the most GitHub stars. Supabase has 114,226 GitHub stars, uses the Apache-2.0 license, ships a Docker image and had 6,324 commits in the last year; it replaces Firebase.

  2. 2

    Appwrite

    End to end backend server for web, native, and mobile developers 🚀.

    Stands out for the most commits in the last 12 months (21,189). Appwrite has 57,786 GitHub stars, uses the BSD-3-Clause license, ships a Docker image and had 21,189 commits in the last year; it replaces Firebase and Supabase.

  3. 3

    Logto

    Modern auth infrastructure with OIDC, SSO and multi-tenant support for SaaS and apps.

    Logto has 14,806 GitHub stars, uses the MPL-2.0 license, ships a Docker image and had 1,429 commits in the last year; it replaces Auth0.

  4. 4

    ZITADEL

    Identity infrastructure with SSO, passkeys, multi-tenancy and audit trails, built in Go.

    ZITADEL has 15,457 GitHub stars, uses the AGPL-3.0 license, ships a Docker image and had 608 commits in the last year; it replaces Auth0 and Okta.

2 of 7 · 3 picks

Billing and subscriptions

  1. 1

    Lago

    Metering and usage-based billing.

    Stands out for the newest codebase (created February 2022). Lago has 10,714 GitHub stars, uses the AGPL-3.0 license, ships a Docker image and had 199 commits in the last year.

  2. 2

    Kill Bill

    Subscription billing & payments platform. Have access to real-time analytics and financial reports.

    Kill Bill has 5,824 GitHub stars, uses the Apache-2.0 license, ships a Docker image and had 220 commits in the last year.

  3. 3

    HyperSwitch

    Payment switch to make payments fast, reliable and affordable. Connect with multiple payment processors and route traffic effortlessly, all with a single API integration.

    HyperSwitch has 45,422 GitHub stars, uses the Apache-2.0 license, ships a Docker image and had 2,323 commits in the last year.

3 of 7 · 3 picks

Product analytics

  1. 1

    PostHog

    Product analytics, session recording, feature flagging and a/b testing that you can self-host (alternative to Mixpanel, Amplitude, Heap, HotJar, Optimizely).

    AI-nativePostHog has 40,486 GitHub stars, uses the MIT license and had 41,124 commits in the last year; it replaces Google Analytics and Metabase Cloud.

  2. 2

    Umami

    Simple, fast, privacy-focused alternative to Google Analytics.

    Umami has 39,742 GitHub stars, uses the MIT license, ships a Docker image and had 1,417 commits in the last year; it replaces Google Analytics.

  3. 3

    Plausible Analytics

    Simple, lightweight (< 1 KB) and privacy-friendly web analytics.

    Plausible Analytics has 29,700 GitHub stars, uses the AGPL-3.0 license and had 618 commits in the last year; it replaces Google Analytics.

4 of 7 · 3 picks

Customer messaging

  1. 1

    Chatwoot

    Customer communication platform (alternative to Intercom and Zendesk).

    Chatwoot has 38,467 GitHub stars, uses the MIT license, ships a Docker image and had 1,509 commits in the last year.

  2. 2

    Novu

    Notification infrastructure for developers.

    Novu has 40,214 GitHub stars, uses the MIT license, ships a Docker image and had 2,467 commits in the last year.

  3. 3

    Listmonk

    High performance, self-hosted newsletter and mailing list manager with a modern dashboard.

    Listmonk has 24,011 GitHub stars, uses the AGPL-3.0 license, ships a Docker image and had 463 commits in the last year; it replaces Mailchimp and Substack.

5 of 7 · 2 picks

Feedback and surveys

  1. 1

    Formbricks

    Experience Management Suite built on the largest open source survey stack worldwide. Gracefully gather feedback at every step of the customer journey to know what your customers need.

    Formbricks has 13,176 GitHub stars, uses the AGPL-3.0 license, ships a Docker image and had 1,615 commits in the last year; it replaces Typeform and Google Forms.

  2. 2

    Fider

    Open platform to collect and prioritize feedback (alternative to UserVoice).

    Fider has 4,590 GitHub stars, uses the AGPL-3.0 license, ships a Docker image and had 529 commits in the last year.

6 of 7 · 3 picks

Status pages and monitoring

  1. 1

    Uptime Kuma

    Easy-to-use self-hosted uptime monitor with status pages and 90+ notification channels.

    Uptime Kuma has 93,018 GitHub stars, uses the MIT license, ships a Docker image and had 1,361 commits in the last year; it replaces Datadog and Uptime Robot.

  2. 2

    OpenStatus

    Open-source synthetic monitoring and status pages from multiple regions.

    OpenStatus has 9,237 GitHub stars, uses the AGPL-3.0 license, ships a Docker image and had 1,187 commits in the last year; it replaces Statuspage.

  3. 3

    SigNoz

    Open-source observability platform for logs, metrics and traces built on OpenTelemetry.

    SigNoz has 32,473 GitHub stars, uses the MIT license, ships a Docker image and had 2,015 commits in the last year; it replaces Datadog and Grafana Cloud.

7 of 7 · 2 picks

Deployment

  1. 1

    Coolify

    Self-hostable Heroku, Netlify and Vercel alternative that deploys apps, databases and services to your servers.

    Coolify has 65,110 GitHub stars, uses the Apache-2.0 license, ships a Docker image and had 5,095 commits in the last year; it replaces Heroku and Vercel.

  2. 2

    Dokploy

    Self-hostable PaaS to deploy apps and databases with Docker, Traefik and a clean dashboard.

    Dokploy has 38,087 GitHub stars, uses the Apache-2.0 license, ships a Docker image and had 2,831 commits in the last year; it replaces Heroku and Vercel.

FAQ

Questions and answers

Still curious? Email info@appsgit.com.

Can I use these apps inside a commercial SaaS?

Usually, but check each license. Permissive licenses such as MIT and Apache 2.0 allow almost anything; AGPL requires you to publish changes if you offer a modified version over a network; source-available licenses can forbid offering the software itself as a service.

Is Supabase free?

Yes. Supabase is open-source software released under the Apache-2.0 license, so you can self-host it at no cost. You only pay for the server it runs on, and some projects also offer an optional paid cloud plan.

Can I run this stack with Docker?

18 of the 20 apps here publish Docker images, including Supabase, Appwrite and Logto, so most of the stack can run side by side with Docker Compose on one server. Size the server for the heaviest app and add off-site backups.

How is this list ranked?

Picked by hand for each job from apps whose own description or topics match it, in curated order inside each section, with GitHub data from October 2026; an app appears only once.

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