Vault test builder
Fast phrase traps, collocations, emotion context, scene inference, and native-sounding choices. The generated prompt bank is now a product surface: choose an angle, pick source-language traps, and review a draft test that can become a funnel, challenge, or catalog diagnostic.
Product angles
Pick the hook first. The builder keeps the same 12k database underneath, but changes the question families and preferred mechanics.
Good for viral funnels that ask whether the learner sounds native or translated.
Level check
A mixed diagnostic from grammar, vocabulary, naturalness, listening, and real-life prompts.
Sound natural
Fast phrase traps, collocations, emotion context, scene inference, and native-sounding choices.
Business-ready
Emails, client-safe tone, meeting subtext, deadlines, and business collocations.
Speak better
Minimal pairs, read-aloud prompts, fast speech, and practical spoken responses.
Exam pressure
Academic reading, listening, writing, inference, and task-rubric prompts.
Travel survival
Airport, hotel, restaurant, shopping, instruction following, and object vocabulary.
Source language
Mechanics
Family mix
Natural English usage 7
Business writing and tone 5
Skill mix
Naturalness 7
Business English 5
Review status
generated-review-candidate 12
Rank the options by naturalness.
Ask the learner to rank options before revealing the best order.
Diagnostic signal
Business tone ranking produces a business english signal at B2.
Conversion hook
Workplace stakes make the feedback feel immediately useful.