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iOS app

Contexta

Turn anything you read into vocabulary you actually own

iOSAuthIAPSubscriptionsClaude APILLM QAToken meteringSpaced repetition
Contexta reading view with a word lookup sheet open
Tap any word in a generated text for reading, meaning and part of speech
iOSAuthIAPSubscriptionsClaude APILLM QAToken meteringSpaced repetition

What I did

  • Authentication
  • Subscriptions and in-app purchases
  • Claude API integration
  • Token expenditure management for AI
  • QA of LLM output
  • Spaced repetition and fill-in-the-blank from unknown words

About the project

Contexta closes the gap between reading a foreign language and remembering any of it. Generate a text on any topic in your target language with AI, scan it for the words you don't know, and add them to your study list — Contexta then writes fill-in-the-blank sentence exercises from exactly those words.

You review them with spaced repetition, and each word keeps coming back until you've mastered it.

Read the story

You Can't QA an LLM the Traditional Way
AI & QA

You Can't QA an LLM the Traditional Way

Traditional test cases assume the same input always produces the same output. Language models don't work like that — and Contexta is a case study in what you have to test instead.

Read article
Thai Sabai Kanji Loop Off Script

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