# API 21

> API 21 (iPhone/iPad app by Cheuk Hin Wong.)

- Source: https://appshunter.io/ios/app/api-21/id6815942221 (this page in markdown: same URL + `.md`)
- Developer: [Cheuk Hin Wong](https://appshunter.io/developer/1833016596)
- Category: Developer Tools
- Price: Free
- Age rating: 4+
- Requires: iOS 15.1 · 40 MB
- Languages: English
- Released: 2026-09-30
- Data updated: 2026-10-08
- User reviews in markdown: https://appshunter.io/ios/app/api-21/id6815942221/reviews.md

## What is API 21?

API21 is a local API client for iPhone. Build a request, hit Send, and inspect the response — without a laptop, and without an account.

Collections, folders, and tabs keep your APIs organized. Environments swap {{variables}} across URL, params, headers, body, and auth. Pre-request and post-response scripts can set headers and save values back into the active environment. Workflows chain saved requests and run them top to bottom.

Import a Postman collection, a Postman environment, an Apifox project, or an API21 export. Export your workspace as JSON when you want it on another device. Everything stays on this phone.

REQUESTS • Methods, URL, query params, and headers • Body: JSON, XML, text, form-data, x-www-form-urlencoded, GraphQL, msgpack, and binary • Auth: Bearer, Basic, API Key, OAuth 2.0, and Digest • Open several requests in tabs

RESPONSE • Status, time, and size • Pretty, Raw, and Headers • Find inside the response body

WORKSPACE • Collections and folders • Environments with {{variable}} interpolation • Pre-request and post-response scripts • Workflows that run saved requests in order • Search by name, URL, or method • Send history

YOUR DATA • Stored on device • Import Postman, Apifox, or API21 JSON • Export environments, APIs, or the full workspace

Built for people who already live in request editors and want the same workflow in their pocket.


## Version history (last 1 release)

### 1.0 — 2026-09-30

No release notes.

## More apps by Cheuk Hin Wong

- [XOXO Game](https://appshunter.io/ios/app/xoxo-game/id6749962749)
- [Prompt 21](https://appshunter.io/ios/app/prompt-21/id6752573818)

All apps by Cheuk Hin Wong: https://appshunter.io/developer/1833016596

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-08.*