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Insomnia vs Thunder Client: Which is Better in 2026?

Choosing between Insomnia and Thunder Client comes down to understanding what each tool does best. This comparison breaks down the key differences so you can make an informed decision based on your specific needs, not marketing claims.

Bottom line: Insomnia is our overall pick for API tools workflows. Pick Thunder Client if you need a free tier to start with.

··Methodology
Editor reviewed0 verified reviews comparedPricing checked Jul 2026

Short on time? Here's the quick answer

We've tested both tools. Here's who should pick what:

Insomnia

API client for REST and GraphQL

Best for you if:

  • • Open-source API client by Kong supporting REST, GraphQL, gRPC, WebSocket, SSE, SOAP, and Socket.io in one tool
  • • Free tier includes unlimited local projects, collection runners, and Inso CLI for CI/CD integration

Thunder Client

Lightweight REST client for VS Code API testing

Best for you if:

  • • Thunder Client is a lightweight REST API client for VS Code
  • • It provides request testing with collections and environments inline
At a Glance
InsomniaInsomnia
Thunder ClientThunder Client
Starts at
FreeFree tier available
FreeFree tier available
Best For
API ToolsAPI Tools
Rating
4.3/54.3/5
Free plan
 Yes Yes

Choose Insomnia or Thunder Client?

Insomnia

Choose Insomnia if

API client for REST and GraphQL

  • Supports 7+ API protocols in a single tool, no need for separate clients
  • Free tier includes unlimited local projects, collection runs, and environments
  • Git Sync provides true version control without vendor lock-in
Thunder Client

Choose Thunder Client if

Lightweight REST client for VS Code API testing

  • VS Code REST client
  • Lightweight
  • Free tier good
  • Budget matters (Free vs Free)
TOP RATED
Insomnia logo

Insomnia

API client for REST and GraphQL

Visit Website
Thunder Client logo

Thunder Client

Lightweight REST client for VS Code API testing

Visit Website
FeatureInsomniaThunder Client
Pricing ModelFreemiumFreemium
User Rating
★4.3/5
15 reviews
★4.3/5
15 reviews
Categories
API ToolsDeveloper Tools
API ToolsIDE & Code Editors

In-Depth Analysis

InsomniaInsomnia

API client for REST and GraphQL

Strengths

  • +Supports 7+ API protocols in a single tool, no need for separate clients
  • +Free tier includes unlimited local projects, collection runs, and environments
  • +Git Sync provides true version control without vendor lock-in
  • +Open-source core means transparency and community-driven development
  • +Inso CLI integrates API testing directly into CI/CD pipelines

Weaknesses

  • -Git Sync limited to 3 users on the free plan
  • -Mock server requests capped at 1,000/month on the free tier
  • -Enterprise SSO (SAML/OIDC) only available on the $45/user/month plan
  • -Desktop-only application, no browser-based or mobile client available
  • -Some advanced features require a Kong account even for local-only usage

Key features

Multi-protocol support: REST, GraphQL, gRPC, WebSocket, SSE, Socket.io, SOAPGit Sync for version-controlled API collections and team collaborationAutomated collection runners for API test suites and CI/CD pipelinesAI-powered mock server generation and commit messagesEnvironment variable management with inheritance and secret maskingInso CLI for running API tests in continuous integration pipelines
Starts at Free

Thunder ClientThunder Client

Lightweight REST client for VS Code API testing

Strengths

  • +VS Code REST client
  • +Lightweight
  • +Free tier good
  • +Active development
  • +Good UI

Weaknesses

  • -VS Code only
  • -Limited features
  • -Team features paid
  • -Better alternatives exist
  • -Feature gaps

Key features

API clientVS Code extensionLightweightCollectionsEnvironmentFree
Starts at Free

Pricing: Insomnia vs Thunder Client

PlanInsomniaThunder Client
Tier 1
Free
Essentials
Free
Free
Tier 2
$12
Pro
$3 month per user
Starter
Tier 3
$45
Enterprise
$7 month per user
Business
Tier 4N/A
$16 month per user
Enterprise

Pricing verified from each vendor's public pricing page. Compare in detail on Insomnia pricing and Thunder Client pricing.

Who Should Use What?

On a budget?

Both are freemium. Compare plans on their websites.

Go with: Insomnia

Want the highest-rated option?

Insomnia: 4.3/5 (15 reviews). Thunder Client: 4.3/5 (15 reviews).

Go with: Insomnia

Value user reviews?

Insomnia: 15 reviews (4.3/5). Thunder Client: 15 reviews (4.3/5).

Go with: Insomnia

3 Questions to Help You Decide

1

What's your budget?

Both are freemium. Pricing won't help you decide here.

2

What's your use case?

Both are api tools tools. Compare their specific features to decide.

3

How important are ratings?

Both are rated 4.3/5.

Key Takeaways

Insomnia

  • Free tier available
  • Our pick for this comparison

Thunder Client

  • Choose if you want lightweight REST client for VS Code API testing

The Bottom Line

Insomnia is our pick.

Frequently Asked Questions

Is Insomnia or Thunder Client better?

Insomnia is rated in our evaluation. Both are freemium.

What are Insomnia and Thunder Client used for?

Insomnia: API client for REST and GraphQL. Thunder Client: Lightweight REST client for VS Code API testing.

What does Insomnia cost vs Thunder Client?

Insomnia is freemium (free tier + paid plans). Thunder Client is freemium (free tier + paid plans). Visit their websites for detailed pricing.

Related Comparisons & Resources

Insomnia AlternativesThunder Client AlternativesInsomnia Full ReviewThunder Client Full Review
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