nowfound

AI · January 11, 2026

LeetDuck: LeetCode on Steroids

AI Mock Interviewer Chrome Extension for LeetCode

What it does

I realized that grinding thousands of LeetCode problems doesn't prepare you for the hardest part of the technical interview: thinking out loud. So I built LeetDuck, a Chrome extension that turns your daily LeetCode practice into a realistic mock interview. Used by 180+ developers and counting! Posted it to r/leetcode and it did well, so decided to try my luck on here! Try it out at https://leetduck.com! and feel free to join the discord: https://discord.gg/SwMa7AwnAj as well!

Does a similar job

all alternatives →
  • Hatchways 2.02023 · ▲154

    Make engineering interviews look more like real work

  • CA
    CodeRev.app – Code Review as Interview2024 · coderev.app · ▲150

    I've long had a dislike for leetcode interviews on both sides of the coin. Project-based interviews can also be challenging because it can end up filtering out folks who don't want to spend several hours building something in their free time. I met up with a friend last year -- a very senior dev -- who had taken some time off to study leetcode exercises while preparing for FAANG interviews. It struck me that one of the key measures of whether a candidate is a fit for a team is rather synthetic. CodeRev.app is a simple, lightweight tool that helps teams evaluate candidates using code reviews.…

  • LeoOct 2025 · ▲14

    Your 24/7 Mock Coding Interviewer

  • IM
    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

  • LL
    Leetpro – LeetCode but for soft-skill interviews2024 · ▲5

    Hey HN — we’re University of Waterloo grads, and we’re building LeetPro (https://tryleetpro.com). LeetPro is Leetcode but for soft skill-based questions and cases. In other words a platform designed to help you nail behavioral, product, and case-based interviews just like Leetcode does for technical interviews. We’re combining AI-driven mock interviews with community-driven content to create a comprehensive preparation tool for systems design, product, and business interviews. We came up with this idea just last week, and we've already launched an MVP that’s worth checking out if…

  • LB
    Leetcode but for front end devs (terrible idea?)2022 · vacation-call-335691.framer.app · ▲8

    Howdy friends! Tell me if this is an atrociously terrible idea - I've been working on building a leetcode for clientside devs so we can practice React and Javascript interview questions in a more concise way, I call it clientside.dev I just finished a beta version of it yesterday and plan on releasing it with many more problems on Jan 1st but it's there if you wanna play with it open to any ideas / feedback however mean or nice it may be :)

More ai this month

the category →
  • I trained a 125M-parameter transformer to autocomplete piano performances in real time (~108 notes/sec on an iPhone 15). The idea is basically GitHub Copilot or Tabnine, except instead of prompting it with code, you prompt it by playing a few notes on a MIDI piano. The model then continues what you played, entirely on-device. The app is free if anyone wants to try it. Happy to answer questions about the model, training, Core ML, or the many things that didn't work.

    AI · 18d ago · simedw.com

  • Astute585

    Automate your B2B brand going viral, with new media creators

    AI · 19d ago · company-app.joinastute.com

  • Grok Bot547

    AI teammates that you can give real work to

    AI · 26d ago · x.ai

  • Hey HN, Henry from Cactus here! We previously released Cactus Needle, a 14MB agentic LLM for tool call, device use, and structured extraction for phones, wearables, smart homes, small robots and microcontrollers. We got really great feedback here, and have now incorporated the suggestions to release Needle 2. The whole model is a single 14MB binary that runs a full session in 28MB of RAM; 45m parameters at 2bit compression. Needle hits 500 tokens/sec decode speed on a Raspberry Pi 5, sits between 400-1,500 tokens/sec on VR devices like Meta Quest 3S and Apple Vision Pro, and ranges…

    AI · 27d ago · cactuscompute.com

  • Monid475

    One wallet, every paid tool your agent needs

    AI · 7d ago · monid.ai

  • Turn website visitors into qualified pipeline

    AI · 20d ago · clarasdr.ai

Launched alongside, January 2026

the whole month →
  • IN

    Hey HN! I wanted to share something I built over the last few weeks: isometric.nyc is a massive isometric pixel art map of NYC, built with nano banana and coding agents. I didn't write a single line of code. Of course no-code doesn't mean no-engineering. This project took a lot more manual labor than I'd hoped! I wrote a deep dive on the workflow and some thoughts about the future of AI coding and creativity: http://cannoneyed.com/projects/isometric-nyc

    AI · Jan 2026 · cannoneyed.com

  • Cowork1,088

    Turn Claude into your digital coworker

    AI · Jan 2026 · claude.com

  • DataFast870

    Revenue-first analytics

    Growth · Jan 2026 · datafa.st

  • OpenClaw841

    The AI that actually does things

    AI · Jan 2026 · openclaw.ai

  • Automatic AI-powered code reviews the moment you open a PR

    Dev tools · Jan 2026 · kilo.ai

  • AI Content Maker, for Social Media Publishing

    AI · Jan 2026 · postsyncer.com