PyGrinder vs Matheion

AI checks your Python code like a real FAANG interviewer. 50 tasks, 20-minute timer, detailed review. One purchase. No subscriptions. Practice makes perfect — when you get instant, specific feedback on every solution. PyGrinder simulates the pressure of a real coding interview: strict timer, AI evaluation, and a verdict you can trust. WHY 50 PROBLEMS MATTER: Most interview prep apps give you 10-15 tasks. You memorize them in a weekend and run out. With 50 hand-picked Python problems — Easy to Hard, across every major topic — you build real algorithmic thinking, not muscle memory. WHAT YOU GET: • AI code review — analyzes structure, complexity, and patterns (not just "correct" or "wrong") • 50 Python problems: Easy to Hard, no filler tasks • 20-minute timer — real interview pressure • Daily Challenge — one new task every day • Detailed checklist: AI answers 5 specific questions about your solution • Big O comparison: your complexity vs optimal • Side-by-side code view with reference solution • Actionable fix plan: what to change and why • Filter by difficulty and topic (Arrays, Two Pointers, DP, Stack, Graphs, Heap...) HOW IT WORKS: 1. Pick a problem or take the Daily Challenge 2. Write Python code in the built-in editor 3. Submit under the 20-minute timer 4. Get your verdict: PASS or FAIL with score (1-10) 5. See the exact line with the issue 6. Unlock full review, complexity analysis, and fix plan PERFECT FOR: • Junior Python developers preparing for technical screens • CS students applying to internships • Self-taught programmers who need structured practice • Anyone improving algorithmic thinking TOPICS: Arrays & Hashing, Two Pointers, Sliding Window, Stack, Binary Search, Linked List, Heap, Dynamic Programming, BFS & Graphs, Binary Tree, Design, Math, Bit Manipulation One purchase unlocks everything. No subscriptions. No accounts. Just code, get reviewed, improve. Download PyGrinder and walk into your interview ready.

Matheion is self-study for computer science — structured lessons you can work through on your own, without a live instructor. Every module follows the same rhythm: • Concepts — clear explanations written for solo reading • Examples — worked code with syntax highlighting • Practice — questions with reveal answers when you are ready • Quiz — multiple-choice check with instant feedback and a saved best score This release includes five courses: • Introductory Python (MA-PY1) — 16 guided modules from expressions and control flow through functions, sequences, strings and files, collections, classes, exceptions, modules, iterators and generators, type hints, inheritance, and decorators. • Java foundations (MA-JAVA0) — guided sessions from getting started on the JVM through arrays, classes and encapsulation, collections, exceptions, file I/O, inheritance, generics, lambdas, strings, enums, and concurrency. • SQL — from queries to database design (MA-SQL1) — 12 guided sessions on one bookshop schema: the relational model, SELECT, aggregation, joins, subqueries and CTEs, set operations, window functions, data changes with transactions, and schema design. • Intro to Web — HTML and CSS (MA-WEB1) — 16 guided sessions that build a small café website page by page: HTML structure, semantic markup, links and media, forms, CSS selectors, the box model, layout, and responsive polish. • Command line and file management (MA-CLI1) — 13 guided modules on a POSIX-style terminal: paths and directories, text files, copy/move/delete, permissions, redirection, pipes and grep, find, environment and PATH, processes, archives, and shell scripting basics. Study on iPhone or iPad. All lesson content is included in the app — no account required, no subscription, no in-app purchases. Works offline after install. More computer science tracks are planned for future updates.