Spark Live

Not started English / Chinese → any language

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Editable — reuse the same code so a saved link keeps working.
Settings — glossary, context, source language, keys

Accuracy

Names, places, scripture books, jargon.
Auto is fine with Gemini — measured on real Cantonese it kept the Cantonese instead of rewriting it as Mandarin.
Gemini keeps Cantonese verbatim instead of rewriting it as Mandarin.

AI keys

This one key is enough.
Backup keys (rarely needed)
Each key has its own rate limit.