Estimate on site—even offline. BlockToBlock is available on iPhone and Android.

Quality is part of the product

Fast, keyboard-usable and honest about what has been verified.

BlockToBlock targets WCAG 2.2 AA and resilient low-bandwidth operation. Automated checks help, but a formal conformance claim requires independent manual screen-reader, keyboard, zoom and device testing.

ACCESSIBILITY

Implemented controls

Semantic headings, labelled form inputs, visible focus, skip navigation, reduced-motion support, responsive tables and live status messages.

PERFORMANCE

Small application shell

The connected workspace uses one focused JavaScript file and one focused stylesheet, with no client framework or third-party UI dependency.

OFFLINE

Recoverable local operation

Service-worker caching, versioned local data, revision history, external backups, encrypted backup option and an offline fallback page.

Automated now

Release checks

  • Django and route tests
  • JavaScript syntax validation
  • Missing labels, image alternatives and duplicate-ID smoke checks
  • Desktop and narrow-screen overflow review
  • Generated PDF rendering and inspection
Manual release gate

Still required for formal AA

  • NVDA, VoiceOver and TalkBack journeys
  • Keyboard-only completion
  • 200% and 400% zoom
  • Forced colours and high contrast
  • Low-end Android and constrained-network trials
Field evidence

Measure with builders

  • Task completion time
  • Input and omission errors
  • Recovery success after device change
  • Estimate-to-actual accuracy
  • Approved participant feedback