I built 17 AI tools for developers in 4 months. Here's what I learned about shipping fast.
Source: Dev.to
From idea to 17 production AI tools using Gemini, Supabase Edge Functions, and a brutal focus on shipping. Real numbers, real mistakes, real lessons.
Four months ago I had an idea: what if devs could roast their own code with AI, calculate their market salary, simulate interviews, and learn programming — all in one place, all free, all multilingual? Today CodeMasterIp has 17 production AI tools, runs in 15 languages, and serves thousands of devs.
Pick the boring stack on purpose
I went with React + Vite + Supabase + Gemini 2.5 Flash via Edge Functions. Nothing exotic. No Kubernetes. No micro‑services.
Why? Because the bottleneck was never the technology—it was always deciding what to build next.
# One Edge Function. One model. One pattern. Repeat 17 times.
https://generativelanguage.googleapis.com/v1beta/models/gemini-2.5-flash:generateContentEach tool ships as a “complete product”
- Every tool has its own URL, OG image, and shareable result page.
- A tool that can’t be shared on Twitter doesn’t exist.
Example
/code-roast→ AI roasts your code with severity badges
Free is not a strategy. It’s the strategy
Most competing tools charge $9/mo. Mine are free.
Why? Because attention is the bottleneck, not money. A free tool that 10 000 people share beats a $9 tool that 200 people pay for—every time.
Monetization comes from the one thing people pay for: the AI chat with persistent context.
Internationalization from day 1
- 15 languages via react‑i18next.
- Every tool, page, and error message is localized.
- Pre‑rendered in 12 languages inside “ blocks for SEO.
Examples of localized copy
- Aprende programación con IA
- Learn programming with AI
- 用AI学编程
Result: traffic from countries I didn’t even target.
The most underrated growth lever: programmatic SEO
I generated 45 000 unique URLs programmatically by combining:
- 12 languages × 200 topics × 18 page types
Most never rank, but some rank #1 for long‑tail queries I never imagined.
Mistakes I made (so you don’t have to)
- Built ads first, removed them later. AdSense killed page speed and SEO (‑40 % LCP). Removed everything.
- Tried Reddit autopromo. r/learnprogramming closed my post in 2 h. Lesson: provide value first, sell later.
- Over‑engineered auth early. Supabase auth + Google OAuth = 30 minutes. Done.
What I’d do differently
- Ship the first tool in a weekend. Not 4 weeks, not 17 tools. One.
- The 17 tools came from compounding learnings: each tool was ~30 % faster to build than the previous one because the patterns repeated.
See all 17 tools in action
Visit codemasterip.com. The Code Roast tool is the most fun — paste any code and the AI will tell you what’s wrong with it (with severity levels, like a real code review).
What would you build with this stack?
Drop your ideas in the comments — I’m curious!