FreeTier Sentinel - Datadog for free-tier limits — alerts before the cliff

Like Datadog, but for free-tier limits. Email at 80% — before the cliff. Every cloud shows usage. None alert you at 80%. Cloudflare, Vercel, Render, Supabase — same gap. Live now: Cloudflare Workers + GitHub Actions + Vercel Next 2 weeks: Supabase, Render, Resend, Neon, R2 Free 3 services, 12h checks, email Pro — $5/mo Unlimited, hourly checks, Discord + Telegram Open source. Runs on Cloudflare Workers — monitors its own free tier.

Hey PH 👋 — solo dev from Seoul. Last month my marketing site went hard-down for 9 hours overnight at 11pm. Cloudflare does have usage analytics — it just doesn't email you when you're at 80%. Same with Vercel, Render, Supabase. Every cloud shows usage, none alert before the cliff. So I built FreeTier Sentinel — one dashboard, one email, alerts for the free-tier SaaS you actually use. Stack: Cloudflare Workers + D1 + KV + Cron Triggers, all on the free tier (~600 lines of TypeScript). Pricing: Free: 3 services, 12-hour checks Pro $5/mo: Unlimited, hourly checks, Discord + Telegram Currently shipped: Cloudflare Workers, GitHub Actions Shipping in next 2 weeks: Vercel, Supabase, Render, Resend, Neon, Cloudflare R2 Built solo, $0/month infra cost (yes, the product monitors its own free tier — turtles all the way down). Would love feedback on: • Which SaaS would you most want covered next? • Does $5/mo for hourly + multi-channel feel right? Open source: github.com/wndnjs3865/freetier-sentinel Live: https://freetier-sentinel.dev

FreeTier Sentinel - Datadog for free-tier limits — alerts before the cliff

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