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Claude API key Stored only on this phone and sent only to api.anthropic.com.

Model

Claude Haiku 4.5Cheapest & fastest — plenty for vocabulary ≈ $0.006per word≈ $0.60 / 100 Claude Sonnet 5Balanced — a bit more nuance ≈ $0.012per word≈ $1.20 / 100 Claude Opus 5Best quality — rarely needed here ≈ $0.04per word≈ $4 / 100

Estimates. The exact cost of every lookup is shown under the word.

Pronunciation

Example sentences on cards

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