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Postmate Client

Privacy-first API client for VS Code — no login, no cloud sync, no telemetry.

Postmate Client is a free, privacy-first API client that runs natively inside VS Code. Test REST, GraphQL, and WebSocket APIs without leaving your editor — no account required, no cloud sync, no telemetry. All requests, environments, and data stay on your machine.

Every feature is included, free — there is no paid tier:

REST, GraphQL, and WebSocket requests with variable autocomplete
Collections and environments with instant switching
Request chaining — pass values from one response into the next request without scripts
Data-driven testing — attach a CSV data table to your environment and run a request against every row, or re-run a single row from a dropdown inside the request panel
Compare API responses — diff two responses or two environments side by side, with differences shown in clean JSONPath notation; run bulk comparisons across a full data table for staging-vs-prod regression checks
Tests and assertions — write them as table rows (no code) or in JavaScript with a Monaco editor
Collection Runner with HTML reports
CLI (pmc) for CI/CD pipelines — GitHub Actions, GitLab CI, Jenkins
mTLS / client certificate support — certificates stay local, never uploaded
One-click import from Postman (v2.0/v2.1), Bruno, Swagger/OpenAPI, and cURL

Postmate Client was built by a solo developer after Postman was blocked at his organization over data privacy concerns. It is designed for developers and teams in security-conscious environments — fintech, healthcare, enterprise — where API payloads, tokens, and certificates must never leave the machine.

Install from the VS Code Marketplace and send your first request in under a minute.

A startup from Austin, the United States that is founded by Shyam Narayan Yadav.

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Pricing:

Free
Official Pricing

Platforms:

Windows
Mac
Linux

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Postmate Client Reviews and Details

This page is designed to help you find out whether Postmate Client is good and if it is the right choice for you.

#API Tools #Developer Tools #APIs #Productivity #Tech

Screenshots and images

Postmate Client running inside VS Code — request builder //
2026-07-07
Compare JSON responses side by side //
2026-07-07
Collection Runner — run entire suites with one click //
2026-07-07
HTML test execution report //
2026-07-07

Features & Specs

Protocols

REST, GraphQL, and WebSocket
Runs in

VS Code — native extension, no separate app
Privacy-Focused

100% local — no login, no cloud sync, no telemetry
Data-Driven Testing

Run a request against every row of a CSV data table, or re-run any single row
Response Comparison

Diff two responses or environments in JSONPath notation; bulk compare across data tables
Collection Runner

Run full suites with HTML reports
Tests & Assertions

No-code table-based tests, or JavaScript
CLI

pmc — run collections in GitHub Actions, GitLab CI, Jenkins
Import/Export

Import & export Postman format; import Bruno, Swagger/OpenAPI, cURL
mTLS Support

Client certificate support — certificates stay local
Pricing

Free — every feature included, no paid tier

Badges

Promote Postmate Client. You can add any of these badges on your website.

<a href='https://www.saashub.com/postmate-client?utm_source=badge&utm_campaign=badge&utm_content=postmate-client&badge_variant=color&badge_kind=approved' target='_blank'><img src="https://cdn-b.saashub.com/img/badges/approved-color.png?v=1" alt="Postmate Client badge" style="max-width: 150px;"/></a>

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Questions & Answers

As answered by people managing Postmate Client.

What makes Postmate Client unique?
Postmate Client combines three things no other API client does together:
- Runs natively inside VS Code — no separate app
- 100% local — no login, no cloud sync, no telemetry
- Every feature free — no paid tier
Two workflows stand out:
- Data-driven testing — attach a CSV data table to an environment and every row appears in a dropdown inside the request. Run all rows, or re-run a single failing row with one click.
- Compare mode — diff responses across two environments in JSONPath notation, even across an entire data table. Staging vs prod regression testing in one click.
Why should a person choose Postmate Client over its competitors?
Choose Postmate Client if your API data must stay on your machine.
- vs Postman — Postman (and its VS Code extension) requires an account and syncs to their cloud. Postmate Client has no account to sign into, because nothing leaves your disk.
- vs Thunder Client — adds full data-driven testing, response comparison, WebSocket support, and a CLI, all free.
- No paywall anywhere — collection runner, CI/CD CLI, and mTLS support are all included.
If you need shared cloud workspaces for a team, Postman is better at that — Postmate Client is built for developers who want speed and privacy.
How would you describe the primary audience of Postmate Client?

Developers and QA engineers who test APIs while writing code and want their data to stay local — especially in security-conscious environments (fintech, healthcare, enterprise) where cloud-based API tools are blocked or discouraged by security teams.

Also a natural fit for VS Code users tired of switching to a separate app for API testing.
What's the story behind Postmate Client?

Postmate Client was built by a solo developer after Postman was blocked at his organization over data privacy concerns — API payloads and tokens syncing to a third-party cloud was an unacceptable risk.

The entire product philosophy stems from that day: no login, no cloud sync, no telemetry, everything stored locally. What started as a personal tool became a full API client for VS Code — and it remains free, with every feature included.
Which are the primary technologies used for building Postmate Client?
- TypeScript and the VS Code Extension API
- Monaco Editor for scripting and diff views
- Core logic ships as the @postmate/core npm package, which also powers the pmc CLI for CI/CD pipelines

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Is Postmate Client good?

I don't have verified, up-to-date information about postmateclient.com specifically, so I can't confirm its legitimacy, quality, or safety. There are many similarly-named delivery/courier-related tools and it's easy to confuse legitimate services with unofficial or low-quality clones, so caution is warranted before trusting or paying for this service.

Why choose Postmate Client?

No independently verified reviews, ratings, or reputable coverage were found for this specific site.
The name is similar to major brands (e.g., Postmates), which raises the possibility of confusion with unofficial third-party tools.
Without clear information on the company behind it, its security practices, or customer support quality, its reliability cannot be confirmed.
Domain age, ownership transparency, and user feedback (via trusted review platforms) should be checked before use.

Recommended for

Users who have already independently verified the site's legitimacy and ownership.
Not recommended for those seeking an official Postmates-affiliated tool without confirming authenticity.
Best avoided by users who need to enter sensitive personal or payment information without first confirming security certifications (SSL, privacy policy, business registration).
Suitable only for advanced users comfortable doing their own due diligence (checking WHOIS data, reviews on Trustpilot/BBB, etc.) before trusting the service.

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Public traffic stats of Postmate Client

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Domain Rating (DR)

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Domain Authority (DA)

Check the "Domain Authority" of Postmate Client on MOZ. A website's domain authority (DA) is a search engine ranking score that predicts how well a website will rank on search engine result pages (SERPs). It is based on a 100-point logarithmic scale, with higher scores corresponding to a greater likelihood of ranking. This is another useful metric to check if a website is good.
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