The cheap UptimeRobot alternative is not what you think (MVP confession)

The most common advice for monitoring side projects is "just use UptimeRobot." It's good advice. It's also incomplete — and this post is about the gap between the two, told by someone who runs eleven projects on about the cheapest stack that can stay alive.

Full disclosure up front: I build Frankenstack, so treat this as one builder's honest comparison, not a review. I'll tell you exactly what a monitoring tool does better than we do — and where our MVP sits. No affiliate links in here — every tool mentioned is linked plainly, because the numbers should stand on their own.

What UptimeRobot (and friends) do brilliantly

The free tier is genuinely generous: 50 monitors, checked every 5 minutes. For a handful of hobby projects, that is all you need — downtime detection, email alerts, done. Their paid Solo plan (~$12-13/mo, prices checked Oct 2026) buys you 60-second checks, which matters when you care about catching short outages. (uptimerobot.com/pricing.)

Better Stack's free tier is also solid: 10 monitors, heartbeats, one status page. Paid starts around $24-29/mo. (betterstack.com/pricing.) If your problem is purely "is my site up, and do I want to know fast," these are the right tools and I won't pretend otherwise.

The gap: uptime is one column of my spreadsheet

When I had 3 projects, "is it up" was the whole question. At 11 projects, the spreadsheet I actually open every morning has different columns: MRR per project, infra cost per project, whether the domain is expiring, whether the cron job silently stopped, whether my AI-token burn spiked this week. Downtime is the least expensive failure in that list. A paused free-tier database costs you nothing in uptime but everything in users.

That's the seam the classic monitors don't cover, and it's why I built Frankenstack — not to replace them, but to sit next to them. Honestly: our uptime checks are 5-minute intervals on edge cron, same as UptimeRobot's free tier. We don't win that column. We win the other columns.

The honest comparison (MVP edition)

What we do: uptime checks every 5 min, heartbeat pings for cron jobs, domain expiry + SSL via RDAP, MRR/visitor tracking with weekly trends, AI-token spend sentinel, public status pages, embeddable badges, an MCP server so your AI assistant can query your stack. Free tier: 5 projects, every feature included; paid tiers ($4.99/mo and up) only raise the project count.

What we don't do (yet): 60-second checks, multi-region checking (our pings run from Cloudflare's edge — global, but you can't pick a region), phone-call/SMS alerts (our channels are Telegram and Discord), team seats, and the two-decade battle-testing of an incident-management platform. If your service earns real money per minute of downtime, pay for a serious tool. That is the honest sentence most comparison posts bury.

Who our MVP fits: the person with 3-20 side projects, a spreadsheet with MRR in it, and a nagging fear that one of them silently paused its database last week. For the 50-monitor single-site use case? Use the free UptimeRobot tier — it's great, and I'd rather tell you that than pretend my $0 plan beats it on a column I don't win.

A cheap stack that actually works (combined)

My own setup, zero dollars beyond the domains: UptimeRobot free for the 2-3 money sites (60s isn't needed there, 5-min is fine, and the paid tier is worth it the moment revenue justifies it), Frankenstack free tier for the full inventory — heartbeats on crons, domain expiry, MRR trends, token burn. Total monitoring cost: $0. The lesson isn't "cheap wins"; it's that matching each tool to its strongest column beats paying for one tool that does everything at 80%.

If that sounds like your situation, the free tier is the same as everything on this blog: frankenstack.app. And if you're already happy with your monitor of choice — good. Keep it. Check your crons though. Those are the ones that die silently.