Smart rotation
Never waste a repetition
An adaptive rotation engine schedules each card and actively skips the ones you just saw, so every session pushes you toward the concepts you have not locked in yet — not the ones you already know.
For engineers interviewing at Big Tech
Walk into your system design interview ready.
ArchCards turns Big Tech system-design prep into fast, spaced flashcard drills — organized by topic and engineering level, synced across your devices, and always one glance away on your home screen.
Free to use · See how it works ↓
Built for deliberate practice
Every feature exists to make your reps count — nothing more, nothing to distract you.
Home-screen widgets
Study without opening the app
Pin an ArchCards widget to your home screen and drill in the gaps of your day. Cards refresh automatically when you close one in the app, or force an update with a tap — with rotating visuals so it never goes stale.
Categorized cards
Know the topic and grade at a glance
Every card is labelled with its category — Databases, Distributed Systems, Caching — and a color-coded level from L4 to Staff, so you always practise at the right depth for the role you are targeting.
Cloud sync
Your progress, on every device
Firebase-backed sync keeps your history consistent across phone and tablet and delivers new cards the moment they ship. Switch devices mid-prep and pick up exactly where you left off.
The interface
A clean surface for deep focus
High-contrast cards on a neutral background — no clutter competing for your attention. The prompt sits on the front with a color-coded topic and level label; one tap flips to a concise, structured answer.
- Tap-to-flip cards with a smooth, distraction-free animation
- Color-coded category and grade badges on every card front
- A home-screen widget that keeps a card in view all day
↓ Try it — tap the card to flip it.
Community-driven
A deck that grows with its community
ArchCards has a feedback loop built into the app. When you hit a topic that is missing, an answer that could be sharper, or a bug, you act on it in the moment — no email, no context-switch. Every request lands with the team and feeds the roadmap. The engineers drilling the cards decide what gets built next.
Request a category
Missing a topic you need for your target company? Ask for it in one tap.
Suggest a card
Know a sharper question or a cleaner answer? Send it straight to the deck.
Report a bug
Something off? Flag it in the moment — no email, no lost context.
100% free to use
ArchCards is supported by occasional full-screen ads that appear only between study sessions or when you advance a level — never in the middle of a card. Your focus during a rep is never interrupted.
Start drilling today.
Turn dead minutes into interview reps. Download ArchCards and put your next system-design round on rails.