Side projects die quietly. A free dyno sleeps, a cron job fails silently, an SSL certificate expires on a Sunday — and you only find out when a user tweets about it. The fix is a free uptime monitor, and in 2026 there are several genuinely useful ones that cost nothing. Here are the eight worth your time, with their real limits and the catch each free tier hides.
What actually matters in a free uptime monitor
Before comparing tools, decide what you need from one. Most side projects only need a handful of things, and every free plan below covers at least the first three:
- HTTP checks that run often enough. Five-minute intervals are fine for a blog; a checkout flow deserves one-minute checks.
- Alerts you will actually see. Email is universal, but Telegram, Discord, and Slack alerts land faster. SMS on a free plan is rare — don't expect it.
- SSL and domain expiry checks. Certificates renew automatically until the one time they don't. A free cert-expiry alert has saved more side projects than any other feature.
- A status page. Nice to have, not essential, but it makes you look professional when things break.
- Heartbeat/cron monitoring. Scheduled jobs can't be checked by pinging a URL; you need a tool your job "pings" when it completes.
1. UptimeRobot — the default answer, with one big caveat
UptimeRobot is the monitor most developers reach for first, and for good reason: the free plan covers 50 monitors with 5-minute check intervals, HTTP(S), ping, port, keyword, and heartbeat monitors, plus one basic status page. Setup takes about two minutes and no credit card is required.
The caveat is licensing: since late 2024, the free plan has been restricted to personal, non-commercial use. If your side project earns revenue — even a little — you technically need the Solo plan (around $7/month for 50 monitors at 60-second intervals with SSL monitoring). Many solo developers run hobby projects on the free tier without issue, but know where the line is drawn.
Best for: personal projects where 5-minute checks are fast enough and you want the largest free monitor count in the category.
2. Better Stack — monitoring plus incident management
Better Stack's free tier is smaller but deeper: 10 monitors at 3-minute intervals, 10 heartbeat monitors, one status page, and bundled incident management with on-call scheduling. Slack and email alerts are included on the free plan, and unlike UptimeRobot there is no non-commercial restriction.
The 3-minute interval beats most free plans, and the heartbeat monitors cover your cron jobs in the same dashboard. The free tier is clearly a funnel into paid plans (monitoring starts around $25/month on the modular pricing), but for up to ten monitors it's a legitimately generous free ride.
Best for: side projects that already look like a business — you want monitoring and incident response in one place.
3. Uptime Kuma — unlimited everything, if you self-host
Uptime Kuma is the open-source favourite (MIT licence, 80,000+ GitHub stars) and the only tool on this list with no free-tier limits at all: unlimited monitors, 20-second check intervals, unlimited status pages, and 90+ notification integrations including Telegram, Discord, and webhooks. Getting it running is one Docker command:
docker run -d --restart=always -p 3001:3001 \
-v uptime-kuma:/app/data \
--name uptime-kuma louislam/uptime-kuma:2The catch is the obvious one: you have to host it, keep it patched, and — critically — host it somewhere other than your app. If your Kuma instance sits on the same provider as your side project, a provider outage takes down both your app and the thing that would have told you about it. A cheap VPS on a different cloud is the standard setup.
Best for: developers comfortable with Docker who want zero recurring cost and full control.
4. HetrixTools — the fastest free checks
HetrixTools offers 15 monitors with 1-minute check intervals on the free plan — the fastest free cadence of any hosted tool here — plus blacklist monitoring (useful if you run anything that sends email) and Slack, Discord, and Telegram alerts. According to current comparisons, free accounts also get generous status-page allowances.
One-minute checks matter more than they sound. On a 5-minute interval, a two-minute outage might never be detected; at one minute, you catch nearly everything. If your side project has any revenue-adjacent traffic, that detection speed is worth more than having 50 monitors.
Best for: projects where catching short outages matters and you don't need dozens of monitors.
5. StatusCake — SSL and domain monitoring built in
StatusCake's free tier covers 10 monitors at 5-minute intervals, but the differentiator is what ships alongside: SSL certificate monitoring and domain expiry alerts are included free, and the free plan even includes a small monthly SMS allowance (around 75 SMS). Push/cron heartbeat monitors are also supported.
Status pages were historically a paid add-on here, so if a public status page matters to you, pair StatusCake with one of the other tools — or accept that SSL and domain expiry coverage is the real prize. Few things are more embarrassing than a side project going down because a certificate lapsed.
Best for: "set and forget" protection against the boring failures — expired certs, lapsed domains, dead crons.
6. Healthchecks.io — the cron-job specialist
Healthchecks.io does one thing and does it well: passive heartbeat monitoring. Your cron jobs, scheduled scripts, and background workers ping a unique URL when they run; if a ping doesn't arrive on schedule, you get alerted. The free tier covers 20 checks, which is plenty for a side project stack.
This is the tool to pair with any of the active monitors above. Uptime checks tell you your site is up; Healthchecks tells you your nightly backup, your invoice cron, and your database snapshot actually ran. The hosted version is simple to use, and the project is also open source if you'd rather self-host.
Best for: anyone running scheduled jobs — which is nearly every side project with a database.
7. Cronitor — uptime plus cron in one dashboard
Cronitor's free "Hacker" plan includes 5 monitors that can be any mix of cron jobs, heartbeats, or uptime checks, with one month of data retention and email plus Slack alerts. Paid plans start at $20/month for 20 monitors, so this is firmly a starter tier — but five monitors covers a typical side project (site, API, backup job, queue worker, cert check).
The appeal is consolidation: one dashboard for both "is it up?" and "did it run?" instead of splitting active and passive monitoring across two tools. The monitor limit is tight, so name your five most critical checks and leave the rest.
Best for: minimalists who want one dashboard for both uptime and cron monitoring.
8. Checkly — for when you need real browser checks
Checkly's free Hobby tier is unusual: 10 uptime monitors plus 10,000 API check runs and 1,000 Playwright browser runs per month. That means your free plan can run scripted checks that actually load your site in a real browser, click through a signup flow, and verify the result — something none of the pure uptime tools above can do.
The trade-off is complexity: browser checks require writing Playwright scripts, and there's one seat on the free tier. But if your side project has a critical user flow (signup, checkout, onboarding), a synthetic browser check catches the class of outage where the homepage loads fine and everything else is broken.
Best for: projects with a critical multi-step user flow worth testing in a real browser.
A quick setup that covers 90% of side projects
You don't need all eight tools. A sensible free stack looks like this:
1. Active uptime: add your site and API to UptimeRobot (or HetrixTools if you want 1-minute checks). Create a monitor per critical endpoint, not just the homepage — /health, /api/status, whatever reflects real health.
2. Cron jobs: point every scheduled job at Healthchecks.io. Add the ping call as the last line of each job so a crash before completion triggers an alert.
3. Alerts: route everything to a Telegram or Discord channel you actually read. Email alerts from a monitor you set up once and forgot are how outages go unnoticed for days.
4. SSL: enable certificate-expiry alerts wherever you monitor — StatusCake includes them free if your main tool doesn't.
Total cost: $0. Total setup time: under an hour.
What free plans won't give you
Set expectations honestly. No free tier offers meaningful SMS or phone-call alerts — those cost the provider real money per message, so they live behind paid plans. Check intervals under a minute are also paid territory on hosted tools (Uptime Kuma aside). And multi-region checks — verifying your site from several continents — are limited or absent on free plans, so a free monitor can occasionally report an outage that is really just a network blip near one probe location. Before panicking at a 3 a.m. alert, check the site yourself.
Key takeaways
- UptimeRobot's 50 free monitors remain the most generous hosted free tier, but the plan is restricted to non-commercial use since late 2024.
- Better Stack gives you 10 monitors at faster 3-minute intervals with incident management included — the best free pick for projects that earn money.
- Uptime Kuma is unlimited and free forever if you self-host it on a *different* provider than your app.
- Pair any active monitor with Healthchecks.io (20 free checks) so your cron jobs can't fail silently.
- Route alerts to Telegram or Discord, not just email, and always enable SSL-expiry monitoring — expired certificates are the most preventable outage in existence.