I built a quizlet clone in 2 hours

In plain words

OpenLearn is an open-source study tool built as an alternative to Quizlet, offering flashcard functionality for students preparing for tests. Created by a 15-year-old developer, it provides core studying features without paywalls, positioning itself as a free educational resource. The tool targets high school and college students seeking accessible study aids in an open-source format.

written from the facts on this page · September 2026

• HW
  How we built a TTS-powered tool for learning spelling/foreign languages2011 · quizlet.com · ▲71
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  Anki/Duolingo-like app using educational YouTube videos2024 · platoedu.org · ▲289

  Hi 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!

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  Open Notebook2025 · noodleflow.ai · ▲144

  Open Notebook is a tool where you can upload your own sources - PDFs (textbooks, research papers), Github repos, documentation websites, and other URLs. Once uploaded, you can either chat with an AI about them or run “apps” on top of those sources. Apps can be anything. Right now, I’ve built the following: - turn articles into short video overviews - create a mind map of the source - create summaries or other reports about the source - generate quizzes or flashcards to help study the source You can also remix existing apps or create one from scratch. I built this because I wanted to make…

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  Lurnby, a tool for better learning, is now open source2022 · github.com · ▲162

  I've been working on Lurnby for 2 years. It's kind of like a mix of pocket + kindle + anki. It lets you => add add epubs, pdfs, and web articles to the app => highlight and add comments => tag and organize highlights => review them with a spaced repetition system Today I made the decision to open source the project. I'm passionate about helping other people learn to learn better and hope that this will allow a lot more innovation in the tool and the space. I'm very new to open source and development in general really, but looking forward to receiving the guidance of the community.

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  New Tab Quizlet2018 · chromewebstore.google.com · ▲70

  Learn by displaying a Quizlet card every time you open a tab

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  Lrnr2025 · ▲40

  The all-in-one study app

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  SimCity, but with Permits▲929

  A free city-building game in your browser. You are the mayor. You know what the city needs. Now get it past the zoning board, the neighbors, the appeals court and the next election.

  Life & fun · 2d ago · permit.petercai.com

• IV
  I've been paying for a rural Tanzanian's education for 10 years▲778

  Life & fun · 14d ago · tanzaniaeducationproject.org

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  Bigwords.page – Turn any screen into a sign. The URL is the app▲728

  Turn a phone, tablet or TV into a sign. Type a message and it fills the screen: welcome signs, timers, Wi-Fi passwords and more. No app, no account, free.

  Life & fun · 15d ago · bigwords.page

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  Guitoro, a virtual guitar you strum with your keyboard▲573

  Play a free virtual guitar online with your keyboard or by touch. Slow songs down and see every chord, string and strum. Acoustic, classic, electric and bass.

  Life & fun · 9d ago · guitoro.com

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  See *almost* any carriers phone settings▲432

  Carrier settings from iPhone, Pixel and Galaxy firmware, decoded and compared: APNs, VoLTE, 5G and Wi-Fi Calling per carrier, and what each build changed.

  Life & fun · 13d ago · carrierexplode.com

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  The whole Solar System and every tracked satellite, live in the browser▲407

  Life & fun · 23d ago · space.bl2.net

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  Xnapper▲1,517

  Take beautiful screenshots instantly

  Work · 2022 · xnapper.com

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  Gamma▲1,169

  Auto-generate decks, docs & social posts inside any workflow

  Work · 2022 · gamma.app

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  Threado▲921

  The command center for community builders

  Life & fun · 2022

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  Remotebase▲744

  Build remote engineering teams in 24 hours

  Dev tools · 2022 · remotebase.com

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  DhiWise 2.0▲740

  Convert Figma designs into Flutter 3.0 & React code rapidly

  Dev tools · 2022 · dhiwise.com

• PA
  Pornpen.ai – AI-Generated Porn▲711

  Hey HN, I've been working on https://pornpen.ai, a site for generating adult images. Please only visit the site if you are 18+ and willing to look at NSFW images. This site is an experiment using newer text-to-image models. I explicitly removed the ability to specify custom text to avoid harmful imagery from being generated. New tags will be added once the prompt-engineering algorithm is fine-tuned further. If the servers are overloaded, take a look at the feed and search pages to look through past results. For comments/suggestions/feedback please visit…

  AI · 2022 · pornpen.ai