Compare Monitoring Tools
Sentinel vs UptimeRobot A Better Alternative for Agencies
UptimeRobot is trusted by millions of users and offers a generous free tier, though it spent most of a year under non-commercial compliance notices before a May 2026 terms rewrite swapped the ban for fair-use reviews, and in August 2026 it raised prices across its paid plans. Sentinel takes a different approach: simple flat pricing with no add-on fees, agency-focused workflows, and automated client reports. Here's an honest look at how they compare.
Feature-by-Feature Breakdown
How Sentinel compares to UptimeRobot
| Feature | Sentinel | UptimeRobot |
|---|---|---|
| Pricing Model | Flat monthly fee, everything included | Base fee + SMS credit packs + per-seat add-ons |
| Check Interval | 30s Business / 1 min Starter & Pro / 5 min Free | 15-30s Team & Scale / 1 min Solo / 5 min Free |
| Locations Verifying Each Check | All 4 regions, simultaneously | 1 region per check (rotating), re-checks from that same region |
| Free Tier | 10 monitors, 5-min checks, Discord and Telegram alerts, commercial use OK | 50 monitors, 5-min; any use since May 2026, fair-use reviews can push heavy accounts to paid |
| SSL Monitoring | Included on all plans | Included on all plans |
| DNS & Domain Monitoring | DNS records + domain expiry on every plan, including Free | Domain & SSL expiry |
| Keyword Monitoring | All plans, up to 10 per monitor | All plans, 1 per monitor |
| Ping & TCP Port | Included on all plans | Included |
| Heartbeat & Cron | Paid plans (Starter+) | Included |
| Performance Audits | Lighthouse audits (Pro+, Beta) | Not available |
| SMS Alerts | Included on Starter+ ($14/mo), US & Canada | Credit packs sold separately ($3-$100) |
| Status Pages | 1 on Free, 5 on Starter, 10 on Pro, unlimited on Business | 1 basic (Free), 3 (Solo), 100+ (Team+) |
| Client Uptime Reports | Automated PDF reports on Business ($79/mo) | Monthly email summaries on paid plans |
| Incident Management | Built-in with notes and timeline | Built-in with root cause details |
| Integrations | Official Slack app, email, SMS, Discord, Telegram, Teams, Webhooks, PagerDuty | 20+ integrations including PagerDuty, Zapier |
| Team Seats | Included on Pro+ (5 members), no per-seat fee | Included on Team+ (3), extras $15-19/mo each |
| macOS Menu Bar App | Native menu bar app on every plan, including Free | Mobile app (iOS + Android) |
Why Agencies Switch
More than just uptime checks
Simple, Predictable Pricing
UptimeRobot's pricing looks simple until you need SMS alerts (sold as credit packs starting at $3), extra login seats ($15-19/mo each), or notify-only seats (another add-on). With Sentinel, the plan price is the whole bill. SMS comes with Starter, and team seats and webhooks come with Pro, with nothing metered on top. No surprises, no calculator needed.
Built for Client Work
UptimeRobot is a great general-purpose tool, but it wasn't designed for agencies managing client portfolios. Sentinel's Pro plan ($29/mo) includes tags to organize by client, a team of 5 with no per-seat fees, 10 branded status pages, and keyword monitoring with up to 10 keywords per endpoint (keyword checks are on every plan, Free included). It's the workflow agencies actually need.
Automated Client Reports
This is where Sentinel is genuinely unique. On the Business plan ($79/mo), you can generate automated, scheduled uptime reports with PDF export, designed to send directly to clients. Pair that with branded status pages on custom domains, and you have a complete client transparency toolkit. UptimeRobot doesn't offer anything comparable.
FAQ
Sentinel vs UptimeRobot questions
How does UptimeRobot's 2026 price increase change the math?
In August 2026, UptimeRobot raised prices across its paid plans; the Solo plan now lists at $11/mo for 10 monitors at 1-minute checks. Sentinel's Starter plan is $14/mo for 25 monitors at the same 1-minute interval, with the official Slack app, Discord, Telegram and Teams alerts, 5 status pages, and SSL, DNS, domain, ping, port and heartbeat checks included. If the increase has you re-evaluating, you can run both side by side on the free plan before deciding: no card required.
Can I use UptimeRobot's free plan to monitor client sites?
On paper, yes. UptimeRobot ran in-app non-commercial compliance notices on free accounts for the better part of a year, then rewrote its terms on May 26, 2026 to allow any use. What replaced the ban is a Fair Use Policy under which account reviews are typically resolved by moving to the plan that matches your level of use, plus a no-resale clause covering white-labeled or repackaged monitoring. Sentinel's free plan has neither: ten monitors, no credit card, client work included.
Doesn't UptimeRobot check from multiple locations?
It can check from multiple regions, but not at once. Per UptimeRobot's documentation, checks rotate through your selected regions, each individual check runs from one region, and when a failure is detected the confirmation re-checks come from that same region. Sentinel runs every check from all four of its regions simultaneously and only alerts when at least three agree your site is down, so a network problem near one data center can't page you.
How does pricing compare?
UptimeRobot is cheap to start, but SMS runs on pay-as-you-go credit packs and some features sit on higher tiers, which makes the bill less predictable. Sentinel uses flat pricing with check types, regions and status pages bundled in, and client reports on Business.
What does Sentinel include that UptimeRobot charges extra for?
Branded status pages on custom domains and automated PDF client reports are the big ones, alongside SSL, DNS, domain, keyword, ping, port and heartbeat/cron checks across four regions on every paid plan.
Can I try Sentinel alongside UptimeRobot?
Yes. The free plan needs no credit card, so you can run both on the same sites and compare alerts, speed and features before switching.
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Start monitoring with Sentinel
If you're an agency that wants simple pricing, no per-seat fees, and monitoring tools designed for client work, give Sentinel a try. 10 monitors free forever, no credit card required.