Leetr

What it does

A smart LeetCode companion that boosts your interview prep with spaced repetition. Track problems, review smarter, and visualize progress with our web app and Chrome extension. Compete with friends and get SMS updates so you never forget a solution.

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  I made a spaced repetition tool to master coding problems2024 · lanki.xyz · ▲206

  As you solve LeetCode questions, you can mark them as hard, medium, or easy. The tool will then recommend questions you should review based on (1) how hard the question was for you and (2) how much time has passed since you last reviewed it. I'd recommend normally attempting LeetCode problems and just marking them as hard, medium, or easy for you at first so the tool knows which problems to recommend you review! Here's the theory behind spaced repetition and learning if interested: https://www.codecademy.com/article/spaced-repetition

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  LeetCard: Coding FlashCards2024 · ▲134

  Your best LeetCode companion

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  memordo2020 · ▲118

  Spaced repetition tool to help you retain more knowledge

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  LeetTrainer — Crush CS Interviews2025 · ▲17

  Master LeetCode faster with instant AI feedback and hints

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  FlipToMind2018 · ▲86

  Space repetition app to help you remember everything

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  TraceCodeApr 2026 · tracecode.app · ▲79

  Learn algorithms by watching them run

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  Dograh▲592

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  I'm an airline pilot – I built interactive graphs/globes of my flights▲1,539

  Hey HN! Pilots everywhere are required to keep a logbook of all their flying hours, aircraft, airports, and so on. Since I track everything digitally (some people still just use paper logbooks!), I put together some data visualizations and a few 3D globes to show my flying history. This globe is probably my favourite so far: https://jameshard.ing/pilot/globes/all If you’ve got ideas for other graphs or ways to show this kind of data, I’d love to hear them!

  Life & fun · 2025 · jameshard.ing

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  All your connections, across all your socials.

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• WC
  Workout.cool – Open-source fitness coaching platform▲827

  I was the main contributor to workout.lol, an open-source fitness app to easily build a workout routine. The project had traction (1.4k GitHub stars, 95 forks, ~20K visits/month), but was eventually sold due to video licensing hurdles. The new owner stopped maintaining it, and the repo went abandoned. Over the next 9 months, I sent 15 emails to try to save it : no replies. Feature requests & issues were ignored. The community was left with a "broken" tool let's say. I couldn't just let it die So I built the new version from scratch with the same open-source spirit, but a better…

  Dev tools · 2025 · github.com