$ open toolkit.app
Aldo's Toolkit
> dev · sec · learn
On-device dev + security utilities, Sec+ / eJPT cert prep with an AI tutor, a biometric password vault, four games, and a markdown notebook. Free. No ads. No tracking. Sign in to sync across devices.
- Free
- No ads
- No ad tracking
- Offline-first
- On the App Store
- On Google Play
// free on the App Store and Google Play.
// screenshots
// swipe to browse
// learn
- Sec+ SY0-701 + eJPT flashcards from real study notes
- Multi-choice quiz with score
- Daily question with streak tracking
- AI tutor, ask concepts in plain English
// dev + security tools
- Hash generator, SHA-1/256/512 + MD5
- Base64 encode/decode + JWT decoder
- UUID v4 + JSON formatter / validator
- Color converter + picker (hex / rgb / hsl)
- Searchable command reference (nmap, hashcat, smb, …)
// vault
- Password generator + strength meter (zxcvbn)
- On-device credential vault, locked by biometrics
- Saved logins never leave your phone
// productivity
- Markdown notes with live preview
- Regex tester with match highlighting
- Pomodoro timer with notifications
- Restaurant tip-out calculator with PDF export
// games
- 2048
- Snake
- Caesar Cipher puzzle
- Hex Memory
// dexter
- A built-in helper you can ask about anything in the app
- Plain-English answers, on demand
// faq
- Is it really free?
- Yes. The whole toolkit is free - no ads, no in-app purchases, no paywall. (The services and ebooks elsewhere on this site are separate.)
- Do you track me or sell my data?
- No. No analytics, no ads, no third-party trackers. The app is local-first, so your notes, snippets, and progress live on your device.
- Does it work offline?
- Yes - the tools, games, command reference, flashcards, and notes all work offline. The AI tutor and cross-device sync are the only parts that need a connection.
- Will my data sync across devices?
- Sign in with the same account that works on this site and your data backs up to your private row and syncs. You can delete your account from inside the app any time.
- Is it on iPhone and Android?
- Yes - it's free on both the App Store (iPhone and iPad) and Google Play (Android), with the same account and sync across them.
// privacy
The toolkit is local-first. Your notes, snippets, and progress live on your device. If you sign in (with the same account that works on this site), the app backs up your data to your private Supabase row. We don't run analytics, ads, or any third-party trackers. You can delete your account from inside the app at any time.
See the full privacy policy and terms.
// follow along
New tools, cert-prep notes, and v1.x release news land on social first.
// built with
expo sdk 54 · expo-router · react native 0.81 · nativewind · supabase · typescript · zxcvbn · expo-crypto
Get the toolkit
Free on the App Store and Google Play - no ads, no tracking, no paywall.