Git-friendly YAML
Every collection, request and environment is a plain YAML file on disk — review, diff, branch and merge like any other code.
Local-first API client
Yamlet
A dark-mode desktop API client for Git-friendly, YAML-based collections. Browse requests in a sidebar, send them with variables and OAuth 2.0, and read responses — everything stored as plain YAML you can commit and diff.
Response body is empty
Click Send to resolve variables and fetch courses.
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What it does
Your API collections, as plain YAML.
Variables & environments
Resolve {{variables}} across request, collection, environment and globals. Hover any placeholder to peek its value, click to edit.
OAuth 2.0
Collection-level auth including client-credentials and authorization-code (PKCE) — tokens fetched, cached and attached for you.
Scripts & tests
Pre-request and post-response scripts at request and collection scope, with a familiar pm surface for variables, requests and assertions.
Tabs & sessions
Work across multiple requests in tabs. Your open tabs, active tab and selected environment are restored when you reopen the app.
Collection runner
Run a whole collection or folder in sequence and watch each request's status roll in.
JSON editor that helps
A real code editor with line numbers, JSON beautify, code folding and inline variable highlighting on bodies and responses.
Imports what you have
Reads collections exported from other tools — map-form variables, list-form auth, scripts and OAuth from a .resources definition.
Latest release
Get Yamlet for Linux and Windows
Self-contained builds — a Debian package for Linux and an installer for Windows. No separate .NET runtime required.
Download the latest release for your platform:
Linux ships as a .deb; Windows as an .exe installer (an .msix package is also available on the releases page).
