What are the best api tools tools with open source?

Top api tools tools with open source include Supabase, Strapi, Directus, Cal.com, Appwrite. These tools combine strong api tools capabilities with open source.

Are there free api tools tools with open source?

Yes! Supabase, Strapi, Directus offer free plans with open source. 5 tools have free or freemium options.

Best API Tools Tools with Open Source

Updated: April 2026

Discover the best api tools software that includes open source. We've curated 5 tools that combine strong api tools capabilities with open source.

Key Takeaways

Supabase is our #1 pick for api tools + open source in 2026.
We analyzed 5 api tools + open source tools to create this ranking.
5 tools offer free plans, perfect for getting started.

Why Open Source Matters for API Tools

Full code transparency

Community-driven development

No vendor lock-in

Customization freedom

5 API Tools Tools with Open Source

Supabase

Open source Firebase alternative

Freemium90/100

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Strapi

Open-source headless CMS

Freemium86/100

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Directus

Open-source headless CMS and data platform

Freemium86/100

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Cal.com

Open source scheduling

Freemium85/100

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Appwrite

Open source backend platform

Freemium84/100

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Explore More Combinations

Other API Tools Features

API Access Two-Factor Authentication No Credit Card Required Analytics Dashboard Team Management Data Export

Open Source in Other Categories

Web Hosting DevOps Real-Time Analytics Web Analytics Product Analytics Heatmaps

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