Built That Extension
Find Your Next Chrome Extension Idea
Built That Extension launched on April 23, 2025 with 37 votes, #669 of 7,818 launches that month and more than 90% of that year's launches. The site was still online in September 2026, 1 year on.
What it does
Discover 9500+ expired Chrome extensions with 500+ users each. Download the full dataset and build your next extension idea with proven demand.
Get access to 9500+ expired Chrome extensions with over 500 users each. Perfect for developers and indie hackers looking for proven ideas. These are Chrome extensions that used to be live on the store, with real users — but have now been removed or disabled. The cool part? Most of them had thousands of active users before they went offline. They’re like hidden startup ideas... just waiting for someone to rebuild them 🔁 Google updated how Chrome extensions work. They moved from a system called Manifest V2 to Manifest V3 . Any extension that didn’t update got kicked out of the store. But that doesn’t mean the idea was bad — just that the developer didn’t update it. Each extension had at…from buildthatextension.com
Does a similar job
all alternatives →
Chrome Extensions Ideas2023 · il.ly · ▲125Find Chrome extensions ideas with many users but bad reviews
Profitable Chrome Extension Ideas2024 · iannuttall.gumroad.com · ▲36Find popular Chrome extensions to acquire or compete with
Expired Chrome Extension Revival Kit2025 · shauvik.gumroad.com · ▲6Find, revive, and relaunch proven Chrome extensions
V2 Chrome Extension List2024 · builditn0w.gumroad.com · ▲55Discover outdated Chrome extensions that need to be rebuilt
Profitable Chrome Extensions Database2020 · profitableinsider.gumroad.com · ▲128A database of 60+ hand curated profitable Chrome extensions
30K for Chrome2018 · chromewebstore.google.com · ▲90See how many days you have left and make the most out of it
More dev tools this month
the category →
open-source IDE for thoughtful software design. Contribute to devdotfast/whiteboard development by creating an account on GitHub.
Dev tools · 28d ago · github.com
Contribute to reladraw/reladraw development by creating an account on GitHub.
Dev tools · 26d ago · github.com
OpenBot▲362Grok Bot alternative: free, local, open-source, multiplayer
Dev tools · 23d ago · openbot.run
Talanoa▲346Hi HN, I’m a fullstack developer, and honestly, I’ve lost count of how many side projects I’ve worked on over the years. But one idea kept coming back to me: a different kind of email client. It first came to me in 2014: “What if we could handle emails more like conversations?” Every year, I’d revisit this concept in my “Build Notes.” Ten years later, no one had built exactly what I had in mind — so I finally decided to do it myself. That’s how Talanoa was born. I wanted something focused on people, not timelines. I was tired of marking messages as unread just to remember to reply later, or…
Dev tools · 20d ago · talanoa.email
CoreSpeed▲332One MCP for everything your agents need: apps, memory, tools
Dev tools · 28d ago · corespeed.io
Source: Product Hunt launch ↗
Launched alongside, April 2025
the whole month →
Hi everyone, I built PyXL — a hardware processor that executes a custom assembly generated from Python programs, without using a traditional interpreter or virtual machine. It compiles Python -> CPython Bytecode -> Instruction set designed for direct hardware execution. I’m sharing an early benchmark: a GPIO test where PyXL achieves a 480ns round-trip toggle — compared to 14-25 micro seconds on a MicroPython Pyboard - even though PyXL runs at a lower clock (100MHz vs. 168MHz). The design is stack-based, fully pipelined, and preserves Python's dynamic typing without static type restrictions.…
Dev tools · 2025 · runpyxl.com
The Unsure Calculator is an online tool that lets you calculate with numbers you’re not sure about.
Life & fun · 2025 · filiph.github.io
https://the-pocket.github.io/Tutorial-Codebase-Knowledge/
AI · 2025 · github.com
