I combined spaced repetition with emails so you can remember anything
Hey HN, I am a student shipping apps in my free time. This is my 4th for the year! Non-fic books and podcasts have been part of my life for years now but I always struggled with remembering what I’ve read or listened to. I wanted it to stick even after years. My notes list grew large but I never really revisited them. That’s why I created GinkgoNotes. You can enter notes you want to recall and leave it to the app to create a personalised (based on spaced repetition) email schedule. That means you’ll get your notes emailed to you a couple of times exactly when you should read them again…
I combined spaced repetition with emails so you can remember anything launched on December 4, 2024 with 244 votes, #143 of 5,365 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 1 year on.
In plain words
GinkgoNotes helps users retain information from books and podcasts by combining notes with spaced repetition. Users enter notes they want to remember, and the app automatically sends personalized reminder emails timed according to the Ebbinghaus Forgetting Curve to reinforce retention. Instead of accumulating unreviewed notes, the system ensures users revisit key information at optimal intervals for long-term memory. The app is designed for learners and readers who struggle to retain material they've consumed over time.
written from the facts on this page · September 2026
From the sources
GinkgoNotes uses the FSRS spaced repetition algorithm to help you remember book, podcast, and article notes. Science-backed email & Telegram reviews — pay once, keep forever.
Save the ideas you love, and we’ll send them to you according to your forgetting curve. This helps you reread them at the right time, keeping them fresh in your mind. Spaced repetition is the best proven method to remember new information. That's why we built this app around it. Add anything from the wilderness. Suitable for podcast, book and article notes. We’ll calculate the best review times and send four sessions per note over the next months. Reviewing takes under 5 seconds and will boost your recall up to 90%. You can also hide the answer to practice recall then reveal it. We use the FSRS algorithm (the most accurate in the world). Modified to support fixed number of intervals (4)…from ginkgonotes.com
In the maker’s words, at launch
Hey HN, I am a student shipping apps in my free time. This is my 4th for the year! Non-fic books and podcasts have been part of my life for years now but I always struggled with remembering what I’ve read or listened to. I wanted it to stick even after years. My notes list grew large but I never really revisited…
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Anki/Duolingo-like app using educational YouTube videos2024 · platoedu.org · ▲289Hi HN, I watch A LOT of educational YouTube videos but wasn't forgetting a good chunk of the details because I was only really passively watching. So I made a tool that generates quiz questions/flashcards from YouTube videos, and uses spaced repetition like Anki or Duolingo to keep it in memory. Let me know if you find it cool/useful (or terrible ) or if you want to know a bit about the details!
A tool to help you remember shit you are interested in2022 · recall-app.com · ▲493I've been working on Recall for a while now, it had some initial traction in the beginning which has since died down now. I am facing the inevitable question of whether to continue with the project. I just put out a new release and it would be helpful to get advice from the community on what they think of the idea and my implementation.
recallJul 2026 · recallapp.online · ▲43I have been bouncing off flashcards because making them by hand has been always a tedious task. Recall runs as an MCP server - you can connect it to Claude or Chatgpt, point your handwritten or typed notes (PDFs, docs, or even a Notion Page), and it writes Q&A cards straight into a deck. You could even ask Claude or Chatgpt to research on a topic and do the same without having the need to make notes. Then you review them with the FSRS spaced repetition algorithm. Built it solo over the last 2 weeks. Stack used: Next.js, Drizzle + Neon, ts-fsrs for scheduling It's a paid product - no card…
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Source: Show HN post ↗ · launch text quoted in part
