Yaak Logo
Yaak
v2025.4 → Environment Colors and Fonts

The API client for modern developers

A fast, offline, and Git friendly app for HTTP, GraphQL, WebSockets, SSE, and gRPC.

Download
52k
Open Source

Apple Linux Available for Mac, Windows, and Linux

Fast and private

Local-only data, secrets encryption, and zero telemetry.

Filesystem friendly

Optionally store data as plain-text for use with Git.

Extensible

NodeJS plugin system for auth, template functions, and more.

My API Production › List Launches Content WS Chat Server 101 GRPC Users/Create ERR GET Get Video 206 API WS Create User 400 GRPC Users/Create ERR GQL List Launches 200 GET Event Stream 200 POST Get Video 206 PUT comments/:id 200 main POST BASE_URL /graphql GraphQL Params Headers 3 Auth 1 2 3 4 5 6 7 8 9 10 launcheslimit    details     id     launch_date     launch_sitesite $limit$limit (: ) {   (: ) { {           }   } } query LaunchesInt | Variables 1 2 3 10 "count" { : } • 480 ms • 2 KB 200 OK Pretty Headers 8 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 [ null null null "Engine failure""5eb87cd9ffd""2006-03-25""Successful stage""5eb87cdaffd""2007-03-21""Residual thrust""5eb87cdbffa""2008-08-03""Ratsat was carried""5eb87cdbffd86e000604b32c" "data""details""id""launch_date""launch_site""details""id""launch_date""launch_site""details""id""launch_date""launch_site""details""id" {   :     {       : ,       : ,       : ,       :     },     {       : ,       : ,       : ,       :     },     {       : ,       : ,       : ,       :     },     {       : ,         : , a site_id a site_name a site_name_long

Trusted by thousands

Modern, offline, open source, Git friendly, and extensible. What's not to love?

KindMonitor6206
I like the feature where you can paste in curl examples and it formats it right into the client for use. The guy who made Insomnia started Yaak.
Kos Komelin
Got fed up with bloated API clients, so gave @yaakapp a try. Removed others from my computer immediately after that.
Faraz Patankar
My go-to tool for testing APIs as I build them. The interface is clean and much nicer to use than bloated alternatives like Insomnia and Postman.
Müjdat Korkmaz
I definitely recommend it. I tried others as well, but so far I find Yaak to be the most complete open source alternative to Postman
Mubashir
Yaak is the best API client out there 🔥 I love the clean simple UI which is not bloated but still does a lot ♥️ ... Syncs your workspace with Git 👏

Developer friendly

Work in the ways you're already used to.

Everything you need

Yaak's keeps things simple by default, exposing features only when needed.

Start from anywhere

Integrate with your existing workflow by importing data from many places:

PostmanInsomniaOpenAPICurlSwagger

Call any API

Mix multiple protocols together and work on any API within a single workspace.

RESTHTTPGraphQLgRPCWebSocketServer Sent Events

Authenticate anything

Automatically handle complex request authentication, so you don't have to:

OAuth 2.0JWTBasicBearerAPI KeyCustom

Request chaining
Variables
Encrypted secrets
Auth inheritance
Batch send
Custom proxy
Cookies
Rich previews
Import/export
Paste Curl
Copy as Curl
Streaming
Git UI
Command palette
Autocomplete
Request docs

Constantly improving

Your feedback has been shaping Yaak since its launch in January 2024.

2025.4.0Environment Colors and Custom Fonts
2025.3.0Folder Inheritance, and More Template Functions
2025.2.0Encrypted Text, Sharable Environments, and Nested Functions
2025.1.2Removing Telemetry, and Better License Badge
2025.1.1Directory Sync, Git, WebSockets, and OAuth
2024.13.0Signed Windows Binaries and New Pricing
2024.12.0Introspection Controls and Sync System Progress
2024.11.0Server Sent Events, Proxy, and Functions++
View Roadmap

Hey, I'm Greg 👋🏼

After moving on from Insomnia in 2020 I didn't think I'd build another API client, but the market enshittified and I needed another option.

So I started from scratch and built Yaak, the API client I'm proud to put my name behind.

Download
52k