What is the difference between Insomnia and Stoplight?

Insomnia is best for Developers wanting a lightweight REST and GraphQL client, while Stoplight is best for API teams wanting design-first API development. Insomnia starts at Free and Stoplight starts at Free.

Is Insomnia or Stoplight cheaper?

Insomnia starts at Free with a free tier. Stoplight starts at Free with a free tier.

Is there a free alternative to Stoplight?

Both Insomnia and Stoplight offer free tiers.

Insomnia vs Stoplight

Insomnia is Open-source API client for REST, GraphQL, and gRPC with environment variables and plugin support, while Stoplight is API design, documentation, and governance platform with OpenAPI support. Insomnia is open source and can be self-hosted, giving you full control over your data. Insomnia is built for developers wanting a lightweight rest and graphql client, whereas Stoplight targets api teams wanting design-first api development.

At a glance

	Insomnia	Stoplight
Best for	Developers wanting a lightweight REST and GraphQL client	API teams wanting design-first API development
Starting price	Free	Free
Free tier	✓	✓
Open source	✓	—
Free tier available	✓	✓
Open source	✓	—
API Design	—	✓
Docs	—	✓
GraphQL	✓	—
Mock Servers	—	✓
Plugins	✓	—
REST	✓	—
Style Guides	—	✓
gRPC	✓	—

Insomnia

Strengths

Open source and transparent
Includes REST as a core feature, purpose-built for api development workflows
Fully open-source — you can self-host, audit the code, and avoid vendor lock-in
Free for individuals — generous enough for most small teams to get real work done

Weaknesses

Free plan exists but key features are locked behind the paid upgrade
Fewer built-in features means you may need additional tools to cover gaps
Ecosystem of third-party integrations is smaller than the market leaders in api development
Community support can be slower than the dedicated support teams at commercial alternatives

Try Insomnia → Full review

Stoplight

Strengths

Includes API Design as a core feature, purpose-built for api development workflows
Includes Mock Servers as a core feature, purpose-built for api development workflows
Free for 1 project — generous enough for most small teams to get real work done
Established product with 11+ years on the market and a mature ecosystem

Weaknesses

Free plan exists but key features are locked behind the paid upgrade
Developer-oriented tooling may not suit non-technical team members
Ecosystem of third-party integrations is smaller than the market leaders in api development
Mobile experience lags behind the desktop version in features and polish

Try Stoplight → Full review

The bottom line

Pricing: Both tools offer free tiers, so you can test each before committing. Insomnia's free plan: Free for individuals. Stoplight's free plan: Free for 1 project.

Feature gaps: Insomnia offers GraphQL, Plugins and REST that Stoplight lacks. Stoplight brings API Design, Docs and Mock Servers that Insomnia does not have.

Team fit: Insomnia is geared toward individual users and small setups, while Stoplight is aimed at mid-size teams teams. Pick the one that matches where your team is today and where it is headed — migrating tools later is always painful.

Open source: Insomnia is open source, meaning you can self-host, audit the code, and avoid vendor lock-in. Stoplight is proprietary — you are trusting the vendor with your data and uptime.

Where each tool shines: Insomnia's biggest strengths are: open source and transparent. includes rest as a core feature, purpose-built for api development workflows. Stoplight's biggest strengths are: includes api design as a core feature, purpose-built for api development workflows. includes mock servers as a core feature, purpose-built for api development workflows.

Watch out for: With Insomnia, users commonly note that free plan exists but key features are locked behind the paid upgrade. With Stoplight, the main complaint is that free plan exists but key features are locked behind the paid upgrade.

Choose Insomnia if...

Your profile matches its sweet spot: developers wanting a lightweight rest and graphql client
You need self-hosting, data sovereignty, or the ability to audit source code
You specifically need GraphQL and Plugins
You care about includes rest as a core feature, purpose-built for api development workflows
Your team size fits the individuals profile Insomnia is designed for

Choose Stoplight if...

You need a tool built for api teams wanting design-first api development
You specifically need API Design and Docs
You care about includes mock servers as a core feature, purpose-built for api development workflows
Your team size fits the mid-size teams profile Stoplight is designed for
The free tier works for you: free for 1 project