Hi HN, I’m Felipe, a 9-5 developer aiming to become a full-time indie hacker. I struggled with flashcard apps that focus on decorating cards instead of learning concepts, so I built FlipCards to solve that problem.

What it does: FlipCards lets you:

- Create cards for any concept (math, language, coding, etc.) - Add multiple variations per card – the more variations, the better your understanding - Study smarter – the algorithm randomly selects variations so you can’t just memorize Q→A patterns

Why it’s different:

- Most apps use reverse cards (Q→A, A→Q). FlipCards uses variations to reinforce concepts in multiple contexts. - Powered by the SM2 spaced repetition algorithm, scientifically proven for long-term retention.

Pricing:

- Free – 1 deck, 3 cards, 1 study session - Annual – $20/year for unlimited decks and cards - Lifetime – $50 one-time for unlimited everything

I built FlipCards because I kept getting stuck decorating cards in other apps. Now I can create as many variations as I want, and the algorithm mixes them for me.

I’d love feedback from the HN community:

- Does this approach to flashcards make sense? - Would you use an app like this for learning?

Try it here: https://flipcardsapp.vercel.app

Thanks, Felipe