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Tech Dev NotesTech Dev Notes
Apps

Every app in the catalog, its developer, and a lookup for any other app.

  • App directoryTracked apps on iOS and Android, by category
  • Find any appLive App Store and Google Play lookup
  • DevelopersPublishers and their apps
  • Compare appsHead to head ratings, ranks, versions
Charts

Live store top charts, plus ranks and movers for the apps we track.

  • App Store chartsLive top free, paid, grossing on iPhone
  • Google Play chartsLive top charts on Android
  • Tracked appsAI and top apps: ranks and weekly movers
Screens

Real in-app screens, store listing screenshots, and launcher icons.

  • In-app screensReal-device iOS and Android UI
  • Store screenshotsApp Store and Google Play listings
  • App iconsAdaptive, monochrome, themed
Tech stacks

SDKs, frameworks and APIs detected in shipped app builds.

  • Tech stacks by appAnalyzed iOS and Android builds
  • TechnologiesEvery detected SDK and framework
Notes

Articles.

  • BlogArticles and guides
Labs

X feature flags, Grok companions, and Grokipedia.

  • X feature flagsFeature switches in X web
  • Grok companionsAni, Mika, Rudi, Valentine
  • GrokipediaRandom article and index
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Security

Security.

Practical notes on how this site is run, what we protect, and how to report issues.

Transport and storage

Public traffic is served over HTTPS with HSTS at the edge. Account sessions use httpOnly cookies. Application data lives in SQLite on the production host with regular backups; object assets (icons, screenshots) are stored in R2 with signed access where needed.

Access controls

Signed-in account surfaces require a valid session. Console and privileged APIs use separate console sessions or bearer secrets. Public APIs that expose bulk data use API keys where applicable.

Operational status

Live component signals are published on /status. Machine-readable health is available at /api/health.

Vulnerability disclosure

If you find a security issue in Tech Dev Notes, please report it privately before public disclosure. Contact @techdevnotes with a clear description, affected URL or API route, and steps to reproduce. Do not access other users' data or disrupt production services while testing.

Privacy

For what we collect and why, see the Privacy Policy.

Apps
  • App directory
  • Find any app
  • Developers
  • Compare apps
Charts
  • App Store charts
  • Google Play charts
  • Tracked apps
Screens and icons
  • In-app screens
  • Store screenshots
  • App icons
Tech stacks
  • Tech stacks by app
  • Technologies
Notes
  • Blog
Labs
  • X feature flags
  • Grok companions
  • Grokipedia

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