- ACCHow to Meet WCAG — quick reference
Filterable list of success criteria with techniques.
- ACCMaking your service accessible — GOV.UK Service Manual
Practical, UK-focused introduction for teams.
- APPApp Store Review Guidelines
The rules behind most iOS rejections.
- APPHuman Interface Guidelines — Apple
Platform conventions for iOS and iPadOS.
- APPData safety section — Google Play
What Android apps must declare about data.
- APPMaterial Design 3
Google's design system and Android conventions.
- PRVUK GDPR guidance — ICO
The regulator's guidance for organisations.
- SECOWASP Top Ten
The most common web application security risks.
- SECSmall Business Guide — NCSC
Baseline cyber security steps.
- PRFWeb Vitals — web.dev
Loading, responsiveness and stability metrics explained.
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A note on specifications
If you are writing a brief for any supplier, list your users, the three most important tasks, the platforms you must support, any hard deadlines and any systems the product must connect to. That page alone will make estimates far more reliable.