Altair GraphQL Client is a feature-rich desktop application for Mac that lets developers craft, test, and debug GraphQL queries and mutations against any API endpoint.
What is Altair GraphQL Client?
Altair GraphQL Client is a free, open-source GUI tool for interacting with GraphQL APIs — essentially what Postman is to REST, but purpose-built for the GraphQL protocol. Rather than hand-rolling queries in a terminal or fighting with curl, you get a polished editor with schema introspection, variable management, and live documentation right inside the window.
I have been using Altair daily while building a GraphQL-heavy backend, and it has genuinely replaced every other tool I tried. The moment you point it at an endpoint that supports introspection, the entire schema populates automatically — types, queries, mutations, subscriptions — and the editor starts autocompleting field names as you type.
What does Altair GraphQL Client do best?
Altair's strongest suit is its deep editor experience: query autocompletion, inline error highlighting, and one-click schema exploration make writing complex nested queries feel approachable rather than tedious. Subscriptions work out of the box over WebSocket and Server-Sent Events, which is something many rival tools handle poorly.
- Schema documentation panel — browse the full type graph without opening a browser
- Query variables and HTTP headers — set environment-specific values per workspace
- Pre-request and post-request scripts — inject auth tokens dynamically, much like Postman's scripting layer
- Collections — save and organise queries the same way you would bookmark terminal commands
- Plugin system — extend the UI with community plugins (extra themes, custom export formats, OAuth helpers)
One underrated feature is multi-window support. I keep one window per microservice, each pointed at a different endpoint and authenticated separately, without any context-switching friction.
Is Altair GraphQL Client free?
Altair is free to download and use with no feature gating on core functionality. The project is open-source (MIT licensed) and actively maintained on GitHub. A cloud sync option exists for teams who want to share collections and environments, though the local desktop experience is entirely free for individuals.
Who should use Altair GraphQL Client?
Any developer who touches a GraphQL API regularly — backend engineers writing resolvers, frontend engineers consuming a graph, or QA engineers verifying schema contracts — will find Altair significantly faster than alternatives. If you are still copy-pasting queries into a browser's GraphQL Playground or using a generic HTTP client, Altair is the upgrade you want.
It is particularly valuable if your stack uses subscriptions, since real-time testing is handled natively. Teams working with authentication-heavy APIs (JWT refresh flows, OAuth 2.0) also benefit from the pre-request scripting, which saves the manual copy-paste of tokens on every session.
What are the best Altair GraphQL Client alternatives?
The main alternatives are GraphiQL, Insomnia, and Postman. GraphiQL is the reference in-browser tool but lacks the desktop ergonomics, collections, and scripting depth of Altair. Insomnia supports GraphQL as part of a broader REST/gRPC toolkit, which is convenient if you work across multiple protocols but can feel bloated for pure-GraphQL work. Postman added GraphQL support, though it remains a REST-first tool and the subscription experience lags behind Altair.
For Mac users who want a single-purpose, keyboard-friendly GraphQL tool, Altair is the clearest recommendation. If you split time between REST and GraphQL heavily, Insomnia is worth a look as a daily driver — but keep Altair around for anything subscription-related.
How does Altair GraphQL Client compare to GraphiQL?
GraphiQL is the canonical in-browser playground bundled with most GraphQL servers. Altair surpasses it in almost every desktop use-case: it persists collections, handles multiple simultaneous endpoints, runs pre-request scripts, and supports subscriptions over WebSocket without any server-side configuration. GraphiQL remains useful as a quick in-browser sanity check, but it was never designed as a daily-driver client — Altair was.
