Vault test builder
A mixed diagnostic from grammar, vocabulary, naturalness, listening, and real-life prompts. 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.
Useful when you need a fresh broad test without hand-authoring a new catalog item.
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
Core grammar control 8
Skill mix
Grammar 8
Review status
generated-review-candidate 8
Fill the missing word or phrase.
Use typed input only when the accepted answer is narrow.
Diagnostic signal
Preposition and verb pattern gap produces a grammar signal at B1.
Conversion hook
Short, diagnostic, and reusable across tests, funnels, and practice loops.