9 businesses built with Ruby on Rails
Every business on Build Radar that runs on Ruby on Rails, with its monthly revenue, age and moats — and whether you can vibecode it. Find one. Build it with Leapd.
Or let us pick for you: get a personalized business idea, fitted to your background and backed by businesses on this list →
- All
- AI204
- SaaS61
- Marketing58
- Content Creation44
- Productivity44
- Dev Tools35
- Education28
- Social Media23
- E-comm16
- Fintech16
- Design Tools15
- Analytics14
- Marketplace14
- Entertainment13
- Health & Fitness12
- Community9
- Sales9
- Utilities9
- Games7
- No-Code7
- Recruiting & HR6
- Security6
- Customer Support5
- Travel5
- Real Estate4
- Legal1
- News & Magazines1
- Other1
- Uncategorized1
Top businesses by revenue
| Business |
|---|
 |
$8.1k/mo FriendFilter and GroupFilter are established Chrome extensions for Facebook friend and group management. $11.3K MRR / $135.6K ARR from ~390 subscribers. Stack: Rails, Vue.js, PostgreSQL. Recent v7.2.4 maintenance release. Bonus asset: 100K dormant email list (2019–present). Growth levers already built: CWS Featured badge renomination (submitted Q1 2026), SEO landing page, Rewardful affiliate program. Asset sale to buyer's LLC. 30 days transition support included. SaaS · 7 yrsYes Build This →FriendFilter and GroupFilter are established Chrome extensions for Facebook friend and group management. $11.3K MRR / $135.6K ARR from ~390 subscribers. Stack: Rails, Vue.js, PostgreSQL. Recent v7.2.4 maintenance release. Bonus asset: 100K dormant email list (2019–present). Growth levers already built: CWS Featured badge renomination (submitted Q1 2026), SEO landing page, Rewardful affiliate program. Asset sale to buyer's LLC. 30 days transition support included. SaaS · 7 yrsYes |
$4.4k/mo SSL certificate monitoring: Monitors both public and internal, private certificates and lets you know if you forget to renew or your renewal automation fails. Dev Tools · 9 yrsYes Build This →SSL certificate monitoring: Monitors both public and internal, private certificates and lets you know if you forget to renew or your renewal automation fails. Dev Tools · 9 yrsYes |
 |
 $2k/mo Drive More Sales With the Right TikTok Influencers. 250 Million profiles analyzed and 10 Million curated creators list.Search by niche and location, access real engagement data, and launch high-converting campaigns with confidence. Start free. Cancel anytime. Social Media · 7 yrsYes Build This →Drive More Sales With the Right TikTok Influencers. 250 Million profiles analyzed and 10 Million curated creators list.Search by niche and location, access real engagement data, and launch high-converting campaigns with confidence. Start free. Cancel anytime. Social Media · 7 yrsYes |
 $1.9k/mo Cut your Claude Code & Codex bill by ~50%. Headroom is a menu bar app that quietly optimizes all the inputs that Claude & Codex get. It trims prompt bloat, s… AI · 6 moYes Build This →Cut your Claude Code & Codex bill by ~50%. Headroom is a menu bar app that quietly optimizes all the inputs that Claude & Codex get. It trims prompt bloat, s… AI · 6 moYes |
 $1.2k/mo Automate TikTok to drive traffic to your business. ReelFarm alternative. Keywords - Social, Slideshow, Arcads, Makeugc, Icon, Ads, Video, Automation, Marketi… Marketing · 1 yrYes Build This →Automate TikTok to drive traffic to your business. ReelFarm alternative. Keywords - Social, Slideshow, Arcads, Makeugc, Icon, Ads, Video, Automation, Marketi… Marketing · 1 yrYes |
 $1k/mo We offer managed hosting for OpenClaw, the open-source AI agent framework. Our service provides instant deployment, zero-maintenance infrastructure, and mult… AI · 7 moYes Build This →We offer managed hosting for OpenClaw, the open-source AI agent framework. Our service provides instant deployment, zero-maintenance infrastructure, and mult… AI · 7 moYes |
Showing 9 of 9
🗣️ Founder takes
What founders are saying about the businesses on Build Radar.
another api wrapper
14I like how quickly they get traction - could have huge potential and the business looks simple to copy!
1saw the foudner discussed his growth hack on hacker news, the product is simple but it needed som strong messaging to work
21tbh, I dont know why this worked, the market was crowsed and llmlite was opensource!!! anyone knows what was the edge?
18i know someone made $3m in 6 month doing this - he sells each ebook for $48 and you cna add your own child image as teh hero character in the book
27network effect is probobly teh best moat for them
26the whole product is an API call to vision models - they nailed the execution side
55it is pure execution with almost no mote
1it turned out google is not going to replace them anytime soon .. they are getting some moat in automation side ...
1europe is mess when comes to governance and security related
simple and high margin business - but there are many players and quality of service is vey important
18I see some founders already started building this- infra is hosted by AWS so the rest is just resource manganese and delivering high uptime service
1crowded space- it needs lost of funding to get off the ground
this needs human like voice to be valuable and generic text to voice doesn't cut it
bending spoon bought them for a reson ..
literally has nothing, i don't know why people pay so much...
1AI has already made creating designs so easy that the underlying editor is becoming less valuable.
Cursor proved developers will pay for AI that writes code. The bigger opportunity is an AI-native development platform that can build, test, deploy, and maintain entire products.
1
