Matheion vs Riff

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.

Riff turns anything you're curious about into a podcast — made just for you, on the spot. Type a topic. Two AI hosts research it on the web, write a genuine back-and-forth conversation, and record it in natural voices. A few minutes later you're listening to a show that didn't exist when you asked for it. THREE WAYS TO RIFF • Pick a topic — "Why do we dream?", "The rise and fall of the Concorde", "How does the stock market actually work?" Anything you'd want explained over coffee. • Paste a link — that 40-minute read you keep putting off. Riff fetches the article and turns it into a discussion you can listen to on your commute. • Paste text — an essay, a report, meeting notes. If it's long enough to discuss, Riff can riff on it. MADE FOR LISTENING • Choose your length: quick 5-minute takes, or 10 and 15-minute deep dives — or let Riff decide what the topic deserves. • Fresh, researched content: the hosts search the web before they write, so episodes reflect what's actually going on, not stale training data. • Generation keeps running while you use other apps, and a notification tells you when your episode is ready. • Episodes are saved on your device — replay them anytime, no streaming required. • Out of ideas? Riff suggests new topics based on what you've enjoyed. BRING YOUR OWN KEYS Riff has no subscription and no account. Instead, it runs on two AI services you connect yourself with API keys: Anthropic (Claude) researches and writes each episode, and Google Gemini voices the hosts and draws the artwork. You pay each provider directly for exactly what you use — a typical episode costs well under a dollar, and Gemini offers a free tier. Setup takes a couple of minutes, and the app walks you through it. PRIVATE BY DESIGN Your API keys are stored in your device's Keychain and sent only to Anthropic and Google. Your topics and pasted text go only to those services to make your episode. No accounts, no tracking, no middleman servers — episodes live on your device. Riff requires your own Anthropic and Google Gemini API keys. API usage is billed by those providers at their standard rates.