Quick answer
UptimeRobot - UptimeRobot wins for most builders because its free tier is larger, includes no-credit-card signup, and reaches a broader set of monitoring use cases before you have to pay.
How the free tiers compare
These two free tiers solve adjacent problems but they draw the line in different places. Cronitor is more of a developer-centric monitoring bundle: fewer monitors, but it combines cron, heartbeat, website, API, status pages, alerts, and even 100,000 RUM events in one free plan. That makes it a better fit if you want one tool for job and service monitoring with some frontend visibility. UptimeRobot is narrower but more generous at the free level: up to 50 monitors, API access, mobile apps, multi-location checks, and no credit card required. Its free tier feels more like a lightweight operations console, while Cronitor feels like a smaller but more integrated observability starter. Once you pay, Cronitor prices by monitor and user, while UptimeRobot moves into flat tiers, so the cost curve is very different.
Cronitor vs UptimeRobot free tier, side by side
| Cronitor FTV 42 | UptimeRobot FTV 53 | |
|---|---|---|
| Free monitors UptimeRobot gives a much larger free cap. | 5 | Up to 50 |
| Monitoring interval Both free tiers top out at 5-minute checks. | Fastest check frequency of 5 minutes | 5-minute monitoring intervals |
| Status pages Both include a basic public status page on free. | One included basic status page | Basic status pages |
| Subscribers / notify recipients Cronitor includes subscribers on free; UptimeRobot says alert recipients are unavailable on free. | 50 included subscribers | No notify seats included |
| Dashboard / login seats UptimeRobot free does not include dashboard access seats. | One included dashboard user | No login seats included |
| Integrations UptimeRobot states a free integration cap; Cronitor's free list does not give a count. | Not specified in free tier items | Up to 5 integrations |
| Data retention Only UptimeRobot specifies free retention. | Not specified in free tier items | 3 months |
| Included extras Different value props: Cronitor includes RUM; UptimeRobot includes API and mobile apps. | First 100,000 RUM events free | API access and mobile apps |
After you outgrow the free tier
Cronitor’s paid pricing is usage-based: monitors are $2 each, users are $5 each, browser checks are 1000 for $1/month, and RUM is 100k events for $10/month. That means costs rise with each monitor and each user, so a small team can stay cheap but active usage adds up. UptimeRobot is flatter: Solo is $8/month, Team is $34/month, and Enterprise starts at $64/month. For most small teams, UptimeRobot is easier to predict, while Cronitor can be cheaper if you only need a few monitors and no extra users. Beyond that, Cronitor’s per-unit model can overtake quickly.
Cost at real usage
| Usage | Cronitor | UptimeRobot |
|---|---|---|
| 5 monitors, 1 user Cronitor estimate uses $2 per monitor plus $5 per user. UptimeRobot Solo is flat-priced and includes 10 monitors, but login seats are not included in the plan details provided. | ~$15/mo | $8/mo |
| 10 monitors, 1 user Cronitor estimate uses the stated per-monitor and per-user rates. UptimeRobot Solo covers 10 monitors at $8/mo. | ~$25/mo | $8/mo |
| 50 monitors, 1 user UptimeRobot Team gives 100 monitors at $34/mo. Cronitor estimate uses only the rates provided, and does not include any volume discounts. | ~$105/mo | $34/mo |
| 100 monitors, 3 users Cronitor estimate is $2 x 100 plus $5 x 3. UptimeRobot Team includes 100 monitors, 3 notify seats, and 3 login seats at $34/mo. | ~$215/mo | $34/mo |
Estimates, not quotes. Usage-based rates change - verify with the vendor's pricing page before committing.
When to pick each one
Pick Cronitor when…
- You mainly need cron job, heartbeat, and uptime monitoring in one place.
- You want real user monitoring included at the free tier for a small site or app.
- You only need a handful of monitors and can live with the 5-minute check floor.
- You want Slack, Telegram, Discord, Teams, and webhook alerts available on the free plan.
- You are okay with a smaller free cap if the tool feels built for developers first.
Pick UptimeRobot when…
- You want the biggest free monitor cap for websites, APIs, servers, and endpoints.
- You need no-credit-card signup for a quick test or side project.
- You want multi-location checks, mobile apps, and API access on the free tier.
- You expect to grow into a simple flat-price paid plan instead of per-monitor billing.
- You need a more conventional uptime-monitoring setup with basic status pages and integrations.
Bottom line
For the most common builder case, UptimeRobot is the safer free-tier pick. It gives you more monitors, no-credit-card signup, mobile access, and a cleaner path into flat paid plans. Cronitor is the better choice only if your monitoring needs are specifically cron, heartbeat, and RUM-oriented, or if you want a more developer-shaped bundle in a smaller free cap. If you expect to monitor many endpoints quickly, UptimeRobot stretches further before you pay.
Read the full listings: Cronitor and UptimeRobot. Scores use the FTV methodology at /ftv. Browse more head-to-heads on /compare, or see the top-ranked free tiers on /top.