Probes — Uptime & Performance Monitoring
Know your site is up.
_From everywhere._
Lightweight uptime and performance monitoring from multiple regions worldwide. DNS, TCP, TLS, and TTFB all broken down to the millisecond.
!Image 1: Probe detail view showing uptime stats, response histogram, and timing breakdown
Probing from 3 regions
San Francisco New York City Amsterdam
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Multi-Region Probes
Every check runs from San Francisco, New York City, and Amsterdam simultaneously. Know if the problem is global or regional.
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Timing Breakdown
Full timing breakdown: DNS lookup, TCP connect, TLS handshake, time-to-first-byte, and content transfer.
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Apdex Scoring
Understand real user satisfaction at a glance. Apdex scores distill response times into a single meaningful number.
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Email & Webhook Alerts
Get notified where you already work. Route alerts to an email address or any HTTP endpoint via webhooks.
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Public Status Pages
Give your users a branded status page with real-time uptime data. No extra setup required.
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Deploy probes in seconds
Add a URL and be done. No agents to install, no YAML to write, no config files to manage.
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Add your endpoint
Enter the URL you want to monitor. Probes start to fire every minute.
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We probe from every region
Probes run from San Francisco, New York City, and Amsterdam. Each captures full connection timings.
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See results instantly
Response times, uptime percentage, Apdex scores, and timing breakdowns in a clean dashboard.
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Know when things break
Set up email or webhook alerts and get notified the moment a probe detects downtime or degraded performance.
Time spent resolving the hostname to an IP address via DNS. A slow lookup often points to a misconfigured or distant DNS resolver.
The TCP handshake — the time from sending SYN to receiving SYN-ACK. This reflects the raw network distance between the probe and your server.
Time to negotiate the TLS session after TCP connects. Certificate chain depth, cipher selection, and OCSP stapling all affect this.
Time to first byte — the wait between sending the request and receiving the first byte of the response. This is your server's think time.
Time to download the full response body after the first byte arrives. Large payloads or slow transfer rates show up here.
The complete round trip — DNS through response body. This is what your users actually experience end to end.
$5 / mo
- ✓ 5 probes to start
- ✓ $1/mo for each additional probe, up to 25 probes (for 25+, contact us)
- ✓ 1 minute check interval
- ✓ 30 days data retention
- ✓ All regions (San Francisco, New York City, and Amsterdam)
- ✓ Email & Webhook alerts
- ✓ Timing breakdown (DNS, TCP, TLS, TTFB)
- ✓ Status pages
| | Probes | UptimeRobot | Statuspage | Cronitor | | --- | --- | --- | --- | --- | | Multi-region probing | ✓ | ✓ | ✓ | ✓ | | Full timing breakdown | ✓ | ✕ | ✕ | ✕ | | Apdex scoring | ✓ | ✕ | ✕ | ✕ | | Status pages included | ✓ | Paid add-on | ✓ | ✓ | | Unlimited team members | ✓ | ✕ | ✕ | ✕ | | Starts at | Free / $5 | Free / $7 | $29 | Free / $7 |
Who is Probes for?
Solo developers, indie hackers, small teams, and anyone running a SaaS, API, or marketing site who wants to know it's up and fast without wading through enterprise dashboards or paying enterprise prices. If you've outgrown a cURL in a cron job but don't need a $300/mo observability platform, Probes is for you.
Start monitoring in under a minute.
No credit card required. Free 14-day trial.