Native controls and shortcuts.
Use familiar windows, menus, keyboard shortcuts, and editing controls.
API testing,
built for macOS.
Build, run, and debug HTTP requests in a native macOS workspace. Your collections stay local, and every response remains available when you need to see what changed.
Build requests quickly.
See what really happened.
Keep a record of every run.
A Mac app from the start.
Caliper uses native windows, menus, shortcuts, and controls. Collections stay as local files, while the app and bundled CLI share the same execution engine.
Files you can keep and inspect.
OpenCollection files work with Finder, Git, and other tools.
History for every request.
Requests, responses, timing, tests, and diagnostics stay together.
Everything stays where you put it.
Collections, folders, requests, and environments live in one native sidebar. Search when you need it. Use the keyboard when that is faster.
- Nested collections and folders
- Workspace and collection environments
- Drag, move, duplicate, import, and export
Build requests without fighting the interface.
Add parameters, headers, bodies, authentication, variables, scripts, and tests in one focused editor. Caliper saves as you work.
See exactly what happened.
The response body is only the start. Follow the network timeline, inspect variables, and review tests without leaving the result.
Execution timeline
See DNS, connection, transfer, scripts, and tests in sequence.
Variables with provenance
Know which value Caliper used and where each capture came from.
Tests beside the request
Keep declarative assertions and scripts close to the work.
When something changes, you can prove it.
Caliper keeps each exchange as encrypted history. Compare two runs to see changes in JSON, text, headers, timing, or binary content.
100 MB
response limitAES-GCM
local history
response limitAES-GCM
local history
Your collections are files. Keep them that way.
OpenCollection YAML is the source of truth. Inspect it in Finder, use it with your preferred version-control tool, or run it from the bundled CLI.
- No proprietary cloud format
- One readable file for each request
- Secrets stay outside portable files
Bring your existing collections with you.
Import Postman, Bruno, Yaak, OpenAPI, Swagger, or cURL. Caliper converts what it supports and clearly reports anything that needs attention.
Download for MacPostman 2.xBrunoYaakOpenAPI 3.xSwagger 2.0cURL
Your requests stay on your Mac.
Caliper runs in the App Sandbox. History is encrypted and credentials use protected storage. Caliper asks before a script can use privileged access.
Encrypted history
Stored exchanges use authenticated encryption and load only when needed.
Sandboxed scripts
Scripts cannot directly access the network, files, processes, or Keychain.
Controlled access
Workspace access and elevated effects require clear authorization.
Buy Caliper once.
Use every feature free for 14 days. If Caliper fits your work, one lifetime license covers up to three personal Macs.
Launch offer
$59.99$99.99
regular price
regular price
- One lifetime license
- Use on up to three personal Macs
- 14-day full trial
- No account needed to start
Before you download.
The short answers to the questions that matter.
What happens after 14 days?
Caliper asks for a license key. Your workspace files stay available in Finder.
Is this a subscription?
No. The launch price is a one-time payment for a lifetime license.
Where are requests and history stored?
Collections stay in the folders you choose. Response history stays on your Mac and is encrypted.
Which Macs are supported?
Caliper runs on macOS 14 or later on Apple silicon and Intel Macs.
Try Caliper on a real request.
Download Caliper for macOS. Open your own collection or explore the included API Workbench sample. You do not need an account.
