Freemium
Hoppscotch
Open SourceAPI Clients · API Tools
Lightweight, open-source API development ecosystem in the browser.
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Discover the 6 best self-hosted tools for api tools. Host on your own servers, keeping data private and under your control. Curated, compared, and updated for developers.
| Tool | Pricing | Platforms | Top Strength | Link |
|---|---|---|---|---|
| Hoppscotch | freemium | web | Lightweight, open-source API development ecosystem in the browser. | Details → |
| Keycloak | free | Web | Open-source identity and access management with SSO and SAML. | Details → |
| Mailpit | free | cli, web | Self-hosted email testing tool with a web UI, catches local mail. | Details → |
| Polar | freemium | web | Open-source payments and monetization for developers — checkouts, subscriptions and license keys, MoR model. | Details → |
| Logto | freemium | web | Open-source auth infrastructure with a beautiful admin console — OIDC/OAuth, SSO and user management, self-hostable. | Details → |
| Cal.com | freemium | web | Open-source scheduling infrastructure — Calendly alternative with booking links, teams and an API you can self-host. | Details → |
API Clients · API Tools
Lightweight, open-source API development ecosystem in the browser.
Authentication · API Tools
Open-source identity and access management with SSO and SAML.
Email · API Tools
Self-hosted email testing tool with a web UI, catches local mail.
Payments · API Tools
Open-source payments and monetization for developers — checkouts, subscriptions and license keys, MoR model.
Authentication · API Tools
Open-source auth infrastructure with a beautiful admin console — OIDC/OAuth, SSO and user management, self-hostable.
Scheduling & Booking · API Tools
Open-source scheduling infrastructure — Calendly alternative with booking links, teams and an API you can self-host.