Practice system design interviews with guided questions, AI feedback, a shared diagram playground, and local-first progress tracking.

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Hinterview is a desktop + web app for practicing:

• HLD
• LLD
• or both on the same problem

It gives you:

• staged interview questions
• AI hints and scoring
• a common canvas/playground
• learning review
• custom question generation

• Shared question library
• Search and filters
• Difficulty sorting
• Stage locking and ordered progression
• Retry and redo support
• Shared stages across HLD and LLD where relevant

• Multiple AI providers
• Encrypted local API key storage
• Hint, answer, and evaluation actions
• Score out of 10.00
• Pass threshold at 8.00

• Text boxes
• Rectangle, circle, cylinder, diamond
• Arrows
• Move, resize, rotate, group select
• Per-stage containers inside one shared canvas
• Autosave and restore

• Recent attempts
• Learning themes
• Recommendations
• Personal notes

• Create a full custom question
• Beautify with AI
• Add custom stages to existing questions
• Suggest the next stage with AI

• Dark mode
• Desktop + web support
• Local SQLite persistence
• Migration ledger
• Error boundary and retry states

• apps/renderer → React + Vite UI
• apps/server → Express + SQLite API
• apps/desktop → Electron shell
• packages/shared → shared schemas and seeded questions
• codex → PRD, milestones, release docs

Install:

npm install

Web:

npm run dev:web

Desktop:

npm run dev

Build:

npm run build

Tests:

npm run test

Release checks:

npm run release:check

• SQLite DB: .data/hinterview.sqlite
• Secret key: .data/secret.key
• API keys are encrypted at rest
• Some renderer cache is also kept in local storage

• PRD
• Milestones
• Release checklist