Built 12 free developer cost calculators in one hub — 109 users day 1 with zero promotion

Hey IH,

Sharing a project I've been quietly building over the
past few months.

The origin story

Got a $340 GitHub Actions bill for a 3-person side project.
macOS runners. We assumed they cost the same as Ubuntu.
They don't. They cost 8x more.

Tried to find a calculator. Everything either required
signup, was buried in a vendor dashboard, or had
2023 pricing. Nothing just said "paste YAML → see cost."

So I built one. Then realized there were 11 other
developer billing problems with the same issue —
no simple, free, up-to-date calculator. So I built
all of them.

What I built

DevCost Tools — 12 free calculators at githubactionscost.online

CI/CD: GitHub Actions, GitLab CI, CircleCI, Docker Hub,
free minutes tracker, platform comparison

AWS: Lambda (x86 vs ARM), CodeBuild (EC2 vs Lambda)

Cloud: Vercel vs Netlify, Supabase vs Firebase,
full tech stack estimator

APIs: AI rate limits (OpenAI/Claude/Gemini/Mistral)

All calculations run in the browser. No signup. No ads.
2026 pricing from official docs.

Early numbers (7 days, zero promotion)

109 active users
111 new users
551 events
Top country: US 46% (42%)
Peak: ~35 users/day

All organic — hadn't posted anywhere yet.

SEO opportunity I'm sitting on

"github actions price" keyword spiked +850% in Jan 2026
when GitHub changed their pricing. I have the exact-match
domain (githubactionscost.online) and the most
comprehensive free tool.

Search Console shows impressions climbing.
Window is still open.

The monetization plan (honest)

Currently $0 revenue. The plan:

1. Build traffic first (targeting 1K/day per tool)
2. AdSense when consistently above 300 daily users
3. Potentially a "Pro" version later with team
   features, saved configurations, cost alerts
4. Keep core calculators free forever

What I'd love feedback on

• Which tool would you actually use day-to-day?
• What developer billing pain point am I missing?
• Any pricing errors you spot? (I've verified
  everything but always possible I missed something)
• Domain is githubactionscost.online which feels
  narrow for 12 tools — any thoughts?

The tool: https://www.githubactionscost.online

Happy to answer any questions about the build
(pure HTML/JS/Tailwind, hosted on Vercel,
domain costs ₹126/year).