The verified reference for interface design
Every UX decision,
traced to its evidence.
92 dense references across 9 disciplines — usability law to cockpit design — every claim cited to real research, every convention labeled as one. Describe your situation; get routed to the answer.
The floor — six defaults that hold for every project
- Touch targets
- ≥ 44×44 pt / 48×48 dp
- Text contrast
- ≥ 4.5:1 (WCAG AA)
- Body text
- ≥ 16 px web / 17 pt iOS / 16 sp Android
- Feedback
- within ~0.1 s, or show progress
- Destructive actions
- undoable — prefer undo over confirm
- Keyboard
- full operability + visible focus
The library
Foundations
The perceptual and physical laws every interface obeys — usability heuristics, interaction laws, gestalt, typography, color, layout, iconography.
9 referencesPsychology
How people perceive, decide, remember, and feel — and where the evidence is strong, shaky, or abused.
7 referencesPlatforms & devices
From responsive web to cockpits: what changes when the screen, the context, or the user changes.
13 referencesDesign systems
Apple, Google, and Microsoft’s systems decoded — and how to build your own with tokens that scale.
4 referencesPatterns
The recurring problems — navigation, forms, search, feedback, notifications, tables, copy, privacy — and their evidence-backed solutions.
10 referencesAccessibility & inclusion
WCAG, the law, every platform’s assistive stack, inclusive design, and designing for the whole world.
4 referencesProcess & strategy
Research, information architecture, testing, metrics, prototyping, and strategy — how good design decisions get made.
5 referencesStyle encyclopedia
Every major visual movement from 1840 to today — and how to apply any of them without breaking usability.
4 referencesFlows
How designers map experiences before drawing screens — user flows, journey maps, service blueprints, state machines, and 30 more, with worked examples and checklists.
35 referencesWhy trust it
Real sources only
Original papers, canonical books, official platform docs — linked from every page. No invented studies, statistics, or URLs, ever.
Honesty about evidence
Peer-reviewed findings, industry conventions, and vendor claims are labeled as what they are — including replication caveats.
Verified July 2026
Every time-sensitive claim — specs, laws, platform guidelines — checked against live primary sources.
Free to use
No paywall, no sign-up. Read it, cite it, and follow the source links to go deeper.