AI Shadowing tech stack

Turn any YouTube video into a language shadowing lesson

Checked Sep 2026

The stack

“Hosting, Auth, Firestore, Storage, and Cloud Functions — basically the entire backend. Cloud Functions in particular let me move all the AI/LLM calls server-side so client devices don't need API keys. Zero infra to manage.” — the maker, May 2026 ↗

LLM API

OpenAI API

“Used as the fallback transcription for videos that don't have YouTube captions. The accuracy on conversational speech across 11 languages saved me from having to limit the product to a single language.” — the maker, Sep 2026 ↗

AI Coding Assistants

Claude Code

“Used Claude for sanity-checking architecture decisions and reviewing tricky bits of Dart code, especially around the audio sandwich logic for shadowing pauses. Faster than waiting for a senior eng to free up.” — the maker, May 2026 ↗