--- title: "I Built an App That Finds if Your App Already Exists" url: https://daily.dev/posts/i-built-an-app-that-finds-if-your-app-already-exists-bogqx3xob source_url: https://www.youtube.com/watch?v=6LHHOBXNmUw type: video:youtube source: "Coding with Lewis" published: 2026-07-29T16:04:52.045Z updated: 2026-07-29T16:05:08.456Z tags: ["github", "llm", "vector-search", "supabase", "pgvector"] reading_time: 1 upvotes: 39 comments: 11 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # I Built an App That Finds if Your App Already Exists **[Coding with Lewis](https://daily.dev/sources/codingwithlewis)** 路 1 min read 路 39 upvotes 路 11 comments ## Summary A developer built a tool that scrapes ~15,000 GitHub repositories into Supabase and uses pgvector for semantic similarity search to check whether your app idea already exists. An LLM then explains how existing projects compare to your idea, helping you avoid rebuilding something already abandoned by someone else. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Community discussion Top comments from developers on daily.dev. **@mahi\_80** 路 15 upvotes > the first thing i would search is "if there is any apps which finds the existing apps"// 馃 **@rzaasadov** 路 3 upvotes > what about apps which is not open sourced and not have any api and etc to be mentioned in github? **@uranio** 路 2 upvotes > This is great! I tried it straight away to sanity-check the direction I'm taking with [schelp.app](http://schelp.app), and it looks like I'm on the right path. Really useful tool. **@lancelotoleriana** 路 1 upvotes > A junior dev sees this and gets discouraged because "it's already been done." A senior dev sees this and gets encouraged because they can see exactly where the previous 10 people got stuck in their READMEs. This tool isn't just an idea checker, it's a competitive analysis shortcut. **@jadzix** 路 1 upvotes > That is a really cool idea. I would definitely use it 馃槃 ## Similar posts on daily.dev - [I Built a Tool to Stop Wasting Time on Toxic Open Source Projects](https://daily.dev/posts/i-built-a-tool-to-stop-wasting-time-on-toxic-open-source-projects-oynvruenf) 路 DEV 路 63 upvotes 路 5 comments --- Tags: [#github](https://daily.dev/tags/github), [#llm](https://daily.dev/tags/llm), [#vector-search](https://daily.dev/tags/vector-search), [#supabase](https://daily.dev/tags/supabase), [#pgvector](https://daily.dev/tags/pgvector) [View this post on daily.dev](https://daily.dev/posts/i-built-an-app-that-finds-if-your-app-already-exists-bogqx3xob)