Two uptime monitoring tools with very different theories about what an alert is for. This page lays out where each wins, where each loses, and which one actually fits your team. We make failover.io, so this isn't neutral, but every figure here is checked against both products' public pricing and terms, and we've quoted sources where it matters.
Both tools cover uptime monitoring basics well. The differences show up in escalation logic, team workflows, and how pricing scales.
| Feature | failover.io | UptimeRobot |
|---|---|---|
| Free plan: commercial use | ✓ Explicitly permitted in Terms | ✗ Prohibited, personal use only |
| Acknowledgment-gated escalation chains | ✓ Each step waits for ack | ~ Time-based escalation only |
| Free plan check interval | 60 seconds | 5 minutes |
| Free plan monitor count | 5 monitors | 50 monitors |
| Fastest paid check interval | 15s (Team, $79/mo) | 30s (Enterprise, $82/mo) |
| HTTP / heartbeat / SSL / keyword checks | ✓ All four | ✓ All four |
| JSON-RPC / blockchain RPC checks | ✓ First-class support | ~ Possible via custom HTTP |
| Frozen block-height stall detection | ✓ Stateful, catches a frozen height | ✗ Per-check assertions only |
| SMS & voice alerts | ✓ Included on Pro+ ($19/mo) | ~ Credits sold separately, don't renew |
| On-call scheduling with rotations | ✓ Included on Team ($79/mo) | ✗ Requires PagerDuty integration |
| Team plan: login seats | Up to 20 included ($79/mo) | 3 included ($38/mo) |
| Status pages | 1 free · 5 Pro · unlimited Team | 1 basic free · full-featured on paid |
| Years on the market | Since 2026 | Since 2010 |
A note on the table: each row is checked against both products' public pricing pages and terms of service as of May 2026. UptimeRobot's plan structure and check intervals can change, so if anything here is out of date, tell us and we'll correct it, including where we got the comparison wrong in our own favor.
UptimeRobot has been running since 2010 and monitors millions of sites. That operating history is a real asset. If "boring and proven" is what you want from a monitoring tool, UptimeRobot has more of it than failover.io, which launched in 2026.
UptimeRobot's free plan includes 50 monitors. failover.io's free plan includes 5. If you need to watch a large number of endpoints at zero cost (and a 5-minute check interval is acceptable), UptimeRobot's free tier covers far more ground. The tradeoff: UptimeRobot's free plan is restricted to personal, non-commercial use, and its free interval is 5 minutes versus failover.io's 60 seconds.
If you've worked in ops for any length of time, you've used UptimeRobot. Colleagues recognize the dashboard, documentation is everywhere, and every integration tool already knows what UptimeRobot is. That familiarity has real value.
UptimeRobot does one thing, answering "is this URL responding?", and does it cleanly. Fast setup, minimal dashboard, dependable alerts. If the question you're answering really is just "is the site up," UptimeRobot is a solid, uncomplicated tool.
UptimeRobot supports time-based escalation: if a monitor is still down after, say, 30 minutes, it can notify a second contact. That's useful, but it fires on elapsed time alone. It doesn't know whether a human actually saw the first alert.
failover.io's escalation is acknowledgment-gated. The chain fires channel 1, then waits. If nobody acknowledges, it fires channel 2, then waits again. It keeps escalating (SMS, voice call, PagerDuty, the VP) until a human explicitly acknowledges from any channel, by SMS reply, voice keypress, email click, or Slack button. The instant someone acknowledges, the chain stops. Escalation is driven by human response, not just the clock.
UptimeRobot sells SMS and voice credits as one-time purchases. They don't renew with your subscription; when they run out, you buy more. High-incident months mean more top-ups.
On failover.io's Pro plan ($19/month), SMS and voice are included in the plan. There are no separate credit packs to buy. A noisy month with several outages doesn't produce a separate bill.
failover.io's free plan checks every 60 seconds. UptimeRobot's free plan checks every 5 minutes. For a revenue-critical endpoint, the difference between learning about an outage in 1 minute versus up to 5 minutes is material. UptimeRobot offers more free monitors; failover.io offers faster free checks. Pick the tradeoff that matches your situation.
UptimeRobot doesn't include on-call rotation logic. Teams who need it integrate PagerDuty or a similar tool: a second product, a second login, a second bill, a second integration to maintain.
failover.io's Team plan includes on-call schedules with rotations, one-click overrides, and per-user timezones. Alerts route to whoever is on-call right now. No second tool required.
UptimeRobot's Terms of Service state the Free Plan is intended solely for personal, non-commercial use, and that commercial use is strictly prohibited. If you're monitoring a business endpoint on UptimeRobot's free tier, you're technically outside their terms. failover.io's Terms explicitly permit commercial use on the Free Plan, so you can monitor a side business or a revenue-generating service on the free tier without violating anything.
Standard HTTP checks cover most websites. failover.io adds first-class support for JSON-RPC payloads (Ethereum nodes, Solana RPCs, Bitcoin Core, any JSON-RPC 2.0 service) plus up to 20 custom headers per monitor for authenticated APIs. That matters for infrastructure that returns errors as HTTP 200 inside the JSON body, which a status-code check would miss. UptimeRobot can POST a body and check for a keyword, but it isn't designed around RPC semantics.
A blockchain node can answer every call with HTTP 200 in a few milliseconds while its block height sits frozen. It lost peers, fell out of consensus, or got stuck syncing, and the RPC keeps replying from stale state. A status check calls that healthy. So does a keyword or a JSON-field assertion, because the height is still a valid number in every response. It just stopped moving.
failover.io tracks the value across checks. You point a monitor at the height field, hex is decoded automatically for EVM and Substrate chains, and set a stall window sized to your chain: 60 seconds for Ethereum, a couple of hours for Bitcoin where long block gaps are normal. A value that hasn't advanced past the window fails the check and climbs the same alert chain as any outage. Presets fill in the right call and JSON path for Bitcoin Core, EVM chains, Solana, Cosmos, Polkadot, XRPL, and NEAR. The first hour we pointed this at a public XRPL pool it flagged an amendment-blocked node returning 200 in 247ms that could not process ledgers at all.
UptimeRobot can POST a JSON-RPC payload, assert on a field in the response, and send custom headers for an authenticated endpoint. What it can't do is compare one check against the last, so a height that is frozen but still a valid number passes its assertions indefinitely. UptimeRobot's own blockchain-monitoring guidance is about watching crypto sites and node status pages for keywords, not detecting a stalled height. Stall detection is stateful, and that state is the whole point.
We mean this honestly: not every team needs what failover.io offers, and switching tools has a cost.
Strengths
Trade-offs
Strengths
Trade-offs
Yes, for teams whose primary pain isn't "is the site up" but "did the right person actually find out the site is down." UptimeRobot is excellent at uptime detection. failover.io is built around what happens after the first ping fails: cascading escalation across multiple channels where each step waits for an explicit acknowledgment.
UptimeRobot offers time-based escalation: if a monitor is still down after a set number of minutes, it can notify an additional contact. It does not have acknowledgment-gated escalation chains, where each step waits for a human to explicitly acknowledge before the next one fires. failover.io's escalation advances on acknowledgment, not just elapsed time.
No. UptimeRobot's Terms of Service state the Free Plan is intended solely for personal, non-commercial use, and that use for any commercial purpose is strictly prohibited. failover.io's Terms explicitly permit commercial use on the Free Plan.
UptimeRobot's Team plan is $38/month for 100 monitors with 3 login seats included. SMS and voice credits are sold separately as one-time purchases that don't renew with the plan. failover.io's Team plan is $79/month for unlimited monitors, up to 20 team members, on-call scheduling, and SMS/voice included with no separate credit purchases.
If you're monitoring personal projects and an email is a sufficient response when something breaks, UptimeRobot's free plan (50 monitors at 5-minute intervals) is excellent and hard to beat. The move to failover.io makes sense when downtime has business consequences and alerts need to reach an awake human, not just land in an inbox.
Not on its own. UptimeRobot can POST a JSON-RPC request and assert that a field is present or matches a value, but it evaluates each check in isolation. A stalled node keeps returning a valid block height that simply stops moving, so a per-check assertion stays green. failover.io tracks the height across checks and fails when it freezes past a stall window you set, with presets for Bitcoin Core, EVM chains, Solana, Cosmos, Polkadot, XRPL, and NEAR, on every plan including free.
Not via a one-click button today. We're planning a CSV import workflow; in the meantime, if you have more than a handful of monitors, email us and we'll help you migrate. It's faster than it sounds.
5 monitors, 60-second checks, all 8 free-tier channels. No credit card. Commercial use allowed.
Start monitoring free →