Stubbi
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AI for language practice

Compare AI conversation partners for people practicing a new language.

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Coverage

12 use cases

Methodology

Break a practice call into small tasks and test each one with the same learner turns. Language teachers review accuracy and level, with a checked answer key where one exists. Record cost per call and response time.

Categories

Hear the learner exactly

Transcribe accented speech word for word, keeping the learner’s mistakes.

Wait for the learner

Tell when the learner has finished, even after long pauses mid-sentence.

Find the mistakes

List what the learner got wrong and how to say it, and leave correct speech alone.

Choose what to correct

Pick the one mistake worth correcting now for this learner, or none.

Reply at the learner’s level

Answer briefly in the language being learned, with the correction included naturally.

Keep the learner talking

Ask questions that build on what the learner said.

Help when the learner is stuck

Rephrase, offer choices, or give the missing word without switching languages.

Speak clearly

Speak at a pace and clarity that suit the learner, without a long wait.

Remember the conversation

Keep track of what the learner said earlier and avoid repeating questions.

Stay at the right level

Keep the language at the learner’s level through the whole call.

Stay in the scenario

Keep the role-play on track and redirect unsafe or off-topic turns.

Feedback after the call

Summarize two or three things to practice, quoting the learner, plus what went well.

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