Cards on the table: we build an iOS API client (Android in development). We wrote this guide anyway because the question deserves a straight answer — Android's API-tool shelf is uneven, and a lot of "top 10" lists are ad-farm filler. Here's what's actually worth installing.
| App | Play installs* | What it actually is | Watch for |
|---|---|---|---|
| Teste (ex-API Tester) | 100K+ · 4.3 (4.5K) | full mobile dev workspace: requests, scripts, terminal | recent reviews report crashes on some Pixel/Samsung devices — verify on yours |
| Reqable | 100K+ | API client + capture/debugging proxy; pairs with its desktop app | proxy workflow has a learning curve |
| HTTP Request Shortcuts | 100K+ | open-source; fire predefined requests from home-screen shortcuts | automation tool, not an exploratory client |
| MQTT Dash / IoT MQTT Panel | 100K+ each | MQTT-only dashboards for IoT work | single-protocol by design |
| Postman web (browser) | — | real Postman, desktop layout in a phone browser | tap targets and Agent assumption; fallback only |
| ReqPad (us) | Android in development | 6-protocol client (REST→gRPC/Socket.IO) on iOS/iPadOS/macOS today | not installable on Android yet — one-email launch list |
* Google Play public listing data, June 11, 2026. Always re-check current reviews — mobile app quality moves fast in both directions.
The category leader by installs, and the broadest feature set on Android: requests plus scripting plus a terminal. If it runs well on your device, it's the most complete option today. The asterisk: at the time of writing, a noticeable share of recent Play reviews report crash-on-launch issues on some Pixel and Samsung devices. That may be fixed by the time you read this — the honest advice is to install, test on your phone for a day, and decide on evidence. Our iOS-side comparison: Teste vs ReqPad.
Closer to "Charles Proxy with a client attached" than a plain API tester: capture and inspect device traffic, then replay and modify requests. If your debugging style is watch what the app actually sends rather than compose requests from scratch, this is the strongest Android pick — especially paired with its desktop counterpart.
Open source and quietly excellent: define a request once, put it on your home screen, fire it with one tap. It's not an exploratory client — it's automation for requests you send repeatedly (toggle the smart home, kick a CI job, hit a health endpoint). Many developers run it alongside a full client rather than instead of one.
Today: nowhere on Android, and we won't pretend otherwise. ReqPad is the six-protocol client (REST, WebSocket, GraphQL, gRPC, MQTT, Socket.IO) with enterprise auth and one-tap Postman import on iOS, iPadOS and macOS — and the Android version is in development. If the protocol depth is what you're missing on this list, leave your email: you'll get exactly one message, on launch day. Meanwhile, if you carry an iPhone or iPad as a second device, the iOS version is free to start.
It was renamed: API Tester (apitester.org) is now called Teste. Same developer and app, new brand — still the category install leader with 100K+ downloads on Google Play.
No. Postman offers desktop and web clients only. The web client loads in a mobile browser but is designed for desktop screens — see our full guide on the Postman mobile situation.
Transparency: we make ReqPad, this is our guide, and pretending we do not exist would be stranger. ReqPad is iOS/iPadOS/macOS today; the Android version is in development, and there is a one-email launch notification list.
Three things: the most recent reviews for your specific device model (stability varies), whether your auth scheme is supported (OAuth2 and signed schemes like AWS SigV4 are where most mobile clients stop), and where your request data is stored.
ReqPad runs on iPhone, iPad & Mac now — REST & WebSocket free forever. Android is on the way; the waitlist is one email, once.