ApiClient vs SQL Challenge

ApiClient is a mobile developer client to test, debug, and manage REST, GraphQL, and WebSocket APIs anytime, anywhere directly on your iOS device. No need to open your laptop just to test an API endpoint, inspect SSE event streams, test FCM push notifications, or generate code snippets. ApiClient gives you desktop-grade API testing power on mobile. KEY FEATURES 1. Multi-Protocol API Testing • REST Client: Support for GET, POST, PUT, DELETE, PATCH, HEAD, and OPTIONS. • GraphQL Suite: Dedicated Query and Variables editor with syntax formatting and error handling. • Real-Time WebSockets: Connect to ws:// and wss:// endpoints with live frame logging, custom headers, and message composer. • Live SSE Streaming: Inspect Server-Sent Events in real-time for AI and LLM streaming APIs. 2. Postman & OpenAPI Compatibility • Postman Collections: Support for Postman Collection v1, v2.0, and v2.1 with multi-level nested folders. • OpenAPI / Swagger: Import OpenAPI 2.0 and 3.0 specifications in both JSON and YAML. • 1-Click cURL: Instant cURL import from clipboard and export to cURL. 3. 9-Language Code Generator Convert API requests into clean, ready-to-run code snippets: • Python (requests) • JavaScript (fetch) • Kotlin (OkHttp) • Swift (URLSession) • Dart / Flutter (http) • Go (net/http) • PHP (cURL) • Java (OkHttp) • cURL command 4. Push Notification Tester (FCM HTTP v1) • FCM HTTP v1 support with on-device OAuth2 token generation. • Import Service Account JSON securely or use Bearer tokens. • Custom notification payloads and topic messaging. 5. Session Cookie Manager & Variables • Automatic Cookie Jar captures response Set-Cookie headers. • Domain-grouped cookie inspector with add, edit, and clear capabilities. • Dynamic Variables: Use {{variable}} substitution across URLs, headers, and request bodies. 6. Developer Power Tools • AI Response Diagnostics: Instant offline root-cause troubleshooting for HTTP errors. • JSON Formatter: Beautify and minify JSON with syntax highlighting. • Crypto Suite: Base64 and AES 128/256 Encryption and Decryption utilities. • History & Collections: Auto-saves request history with search, export, and quick replay. 7. Modern UI & Dark Theme • Full Dark and Light theme parity with automatic system theme synchronization. • Clean, responsive interface optimized for all screen sizes. 8. 100% Private & Local-First Your API keys, tokens, requests, and cookies stay strictly on your device. Zero cloud sync, zero telemetry, and zero middleman servers.

Feed your brain. Query up. Learn SQL the way you will actually use it: one query at a time, against a real database, right on your phone. SQL Challenge is a single path of original questions. Each level hands you a small database and asks for one thing, and you answer with one SELECT. A real SQLite engine ships inside the app and runs your query on the spot — no server, no signal, no waiting. Then it runs your query again on rows you have never seen. Hard-code what was on the screen and you will hear about it. That is the whole difference between a query that looked right and a query that is right. Free to start: the opening levels are free, then unlock the full path with a single one-time purchase. No subscription, no ads, no account. WRITE REAL SQL • A keyboard built for queries: a clause row for SELECT, FROM, WHERE, JOIN, GROUP BY, ORDER BY and the aggregates, and a toggle that upper-cases keywords while leaving your table and column names exactly as typed • A schema panel above the editor: every table with its columns, their types, the row counts, and the first rows to look at • A result sheet that puts your table next to the expected one, so you can see which rows are extra, which are missing, and which column came back under the wrong name FIVE WORLDS TO QUERY • Five invented databases, none of them borrowed from a tutorial: an online shop, a school, a library system, an airline and a music service • Hidden variants of the same schema — an empty table, a tie at the top, a NULL where you assumed a number, a row with nothing to join to — decide whether you answered the question or just the screen LEARN THE RIGHT WAY • Three tiers of hints from Tuple, a cyan beaver who is smug about engineering and on your side anyway • A curated solution once you pass: the obvious query, the better one, and why the difference matters • One path, no shortcuts, easy to hard: filtering and sorting, then joins, grouping and aggregates, then subqueries and common table expressions STAY MOTIVATED • XP, player levels, daily streaks and badges • Six themes, dark and light PRIVATE BY DESIGN • Works fully offline; no account, no tracking — your progress stays on your device • No ads, ever