Insomnia REST VS SecondStack

Compare Insomnia REST VS SecondStack and see what are their differences

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Insomnia REST

Design, debug, test, and mock APIs locally, on Git, or cloud. Build better APIs collaboratively for the most popular protocols with a dev‑friendly UI, built-in automation, and an extensible plugin ecosystem.

SecondStack

Enterprise LLM gateway and self-hosted AI platform: Chat, Code, and Agent workspaces on top of centralized access control, budgets, and usage visibility. An alternative to running LiteLLM plus custom auth, UI, and admin tooling.

Landing page //
2023-10-05

Model selector: OpenAI, Anthropic Claude, and Google Gemini models in one workspace //
2026-07-21

SecondStack gives an entire organization access to AI without handing its data to third-party clouds.

The platform ships three end-user workspaces — Chat for everyday work, Code for engineering teams, and Agent for automation — running on top of an enterprise LLM gateway that connects to the model providers you choose (OpenAI, Anthropic, Google, and others). Platform and security teams manage everything centrally: who can use which models, what each team spends, and where data lives — inside your own infrastructure.

Because SecondStack is self-hosted, prompts, files, and knowledge bases never leave your environment. For teams that prefer not to operate it themselves, a managed deployment run by the SecondStack team is also available.

Pricing is not per-seat, so rolling AI out to the whole company does not multiply the bill. Deployment and operations are backed by an ISO 27001-certified implementation partner.

Insomnia REST

Website: insomnia.rest
Pricing URL: Official Insomnia REST Pricing
$ Details
Platforms: -
Startup details
Country: United States

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SecondStack

Website: secondstack.ai
Pricing URL: Official SecondStack Pricing
$ Details: paid
Platforms: Web Self Hosted
Startup details
Country: United States
Employees: 10 - 19

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Insomnia REST features and specs

User-Friendly Interface
Insomnia REST features a clean and intuitive user interface that makes it easy to create, send, and manage API requests without a steep learning curve.
Support for Multiple Protocols
In addition to REST, Insomnia supports GraphQL and gRPC, making it versatile for developers working with different API protocols.
Environment Management
Insomnia allows you to create and manage multiple environments, making it easier to switch between staging, development, and production settings.
Custom Plugins and Themes
Insomnia supports custom plugins and themes, allowing users to extend its functionality and personalize the interface to suit their workflow.
Collaboration Features
With Insomnia Teams, users can collaborate and share API requests, environments, and other resources, enhancing team productivity.
Cross-Platform Availability
Insomnia is available on multiple platforms, including Windows, macOS, and Linux, providing flexibility for users on different operating systems.

Possible disadvantages of Insomnia REST

Resource Heavy
Some users have reported that Insomnia can be resource-intensive, leading to potential performance issues on lower-end machines.
Limited Free Features
While Insomnia offers a free tier, some of the more advanced features, such as team collaboration and sync capabilities, require a paid subscription.
Steeper Learning Curve for Advanced Features
Although the basic functionalities are user-friendly, mastering the more advanced features might require a steeper learning curve.
Dependency on Electron
Since Insomnia is built on Electron, it might consume more memory and disk space compared to native applications.
Complex Plugin System
While the plugin system is powerful, it can be complex and challenging for users who are not familiar with JavaScript and Node.js.

SecondStack features and specs

Multi-provider LLM gateway
One gateway for OpenAI, Anthropic Claude, Google Gemini and other providers you choose
Self-hosted deployment
Runs in your own infrastructure; prompts, files and knowledge bases never leave your environment
Access control, budgets and usage visibility
Central policies for who uses which models, with per-team budgets and cost visibility

Analysis of Insomnia REST

Overall verdict

Insomnia REST is an excellent choice for developers who need a robust and intuitive tool for API development and testing. Its comprehensive features and ease of use make it a competitive option alongside other popular API clients.

Why this product is good

Insomnia REST is widely regarded as a powerful tool due to its user-friendly interface, extensive plugin ecosystem, and support for multiple authentication protocols. It allows users to easily build, debug, and test RESTful APIs with features like environment variables, code generation, and response validation. Moreover, its compatibility with GraphQL and gRPC makes it versatile for modern development needs.

Recommended for

API Developers
Software Testers
Backend Engineers
Technical Leads
Anyone involved in RESTful API development and testing

Insomnia REST videos

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3 Reasons to use Insomnia REST Client in your Exploratory API Testing

SecondStack videos

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Category Popularity

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Insomnia REST

SecondStack

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Developer Tools

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AI Platform

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User comments

Share your experience with using Insomnia REST and SecondStack. For example, how are they different and which one is better?

Reviews

These are some of the external sources and on-site user reviews we've used to compare Insomnia REST and SecondStack

Insomnia REST Reviews

Top 20 Open Source & Cloud Free Postman Alternatives (2024 Updated)

Product Introduction: Insomnia is a powerful open-source API client designed for simplicity and efficiency and works great as a postman alternative. It supports REST, GraphQL, and gRPC, making it versatile for various API types.

Source: medium.com

Best Postman Alternatives To Consider in 2025

It is a free, open-source platform that boasts a user-friendly interface and robust features like environment and collection management, code snippets, and test automation. Compared to Postman, Insomnia offers a lighter footprint and a more customizable workspace.

Source: www.hypertest.co

Postman Alternatives for API Testing and Monitoring

Insomnia is a user-friendly tool for API development and testing. Insomnia allows creating and sending HTTP and REST requests, like GET, POST, PUT, DELETE, and more. Users can view API responses, including status codes, headers, and body. This enables understanding how the application handles different response scenarios, for efficient debugging.

Source: www.blazemeter.com

Top 10 HTTP Client and Web Debugging Proxy Tools (2023)

Insomnia REST is the best alternative for Postman. It has more than 350 open-source plugins, plus GraphQL built-in with multiple protocol support. Since GraphQL is an added value, you can fully automate the entire lifecycle of APIs, build and debug them efficiently and with ease.

Source: www.bestproxyreviews.com

15 Best Postman Alternatives for Automated API Testing [2022 Updated]

Insomnia by Kong enables you to deliver high-quality APIs through collaboration. This postman alternative also includes testing suites, which allow you to create functional tests and centralize APIs. With this platform’s streamlined API client, sending GraphQL, REST, and SOAP requests are simple. Defining variables such as authentication credentials allows you to manage...

Source: testsigma.com

SecondStack Reviews

We have no reviews of SecondStack yet.
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Social recommendations and mentions

Based on our record, Insomnia REST seems to be more popular. It has been mentiond 134 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

Insomnia REST mentions (134)

Postman's New Pricing Is a Trap; Here Are the Alternatives
Apidog offers 4 users free with unlimited everything. Bruno has built a passionate community around privacy-first API testing. Insomnia continues to improve with strong multi-protocol support. - Source: dev.to / 5 months ago
The Ultimate Guide to Offline API Testing: 10 Tools That Work Without Internet
Insomnia balances professional-grade features with strong offline capabilities. Its Scratch Pad and Local Vault features ensure sensitive data remains on your local machine while providing comprehensive protocol support. - Source: dev.to / 9 months ago
Postman which I thought worked locally on my computer, is down
I ditched Postman for Insomnia (Open source) after Postman refused to adhere to customers to disable auto-updates for 6 years+. I checked on their GitHub issue tracker and it turns out, the solution was to upgrade to their "Enterprise plan". https://github.com/postmanlabs/postman-app-support/issues/6999#issuecomment-3424362009 So, I said fuck it and switched to a real, open source alternative, Insomnia, instead:... - Source: Hacker News / 9 months ago
How to Design a RESTful API with CRUD Operations
Postman and Insomnia provide user-friendly interfaces for manual and automated API testing, while testing libraries like Jest, Mocha, and pytest support programmatic tests. - Source: dev.to / 11 months ago
Sending SMS Messages with PHP
To send the message, you’ll want an HTTP tooling client that makes it easy to send POST requests - I’ve opted for Kong’s Insomnia but you could also use Postman or even a raw cURL request. - Source: dev.to / 11 months ago