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DNS
Records, propagation, and resolver consistency across regions.
Live monitoring · 5 check types
The system is watching. You can finally sleep.
Five independent signals, eight global regions, one clear answer. Sentinel watches the edges of your infrastructure so your team can focus on what ships next.
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📡
🔒
📝
🖥️
Signals live · 8 regions active
sentinel.app/features🌍
8 regions
all active
✅
0 false alerts
30-day avg
Detection
Five ways to know something is wrong
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HTTP
Status codes, response time, redirect chains, and TLS handshake.
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SSL/TLS
Certificate validity, expiry countdown, chain trust, and HSTS.
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Content
Keyword presence or absence, page title match, and content hash drift.
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Browser (Chromium)
Full page render, JavaScript execution, and MetaMask/Web3 detection.
Alerting
Signal without the noise
Quorum 5/8 · Incident Closed
SFO
NYC
LON
SIN
SYD
TYO
FRA
AMS
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Smart escalation
Acknowledge → snooze → escalate with critical bypass. Quiet hours are respected — except when it matters.
Workflow
Built for the 3am runbook
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Audit log
Every check, notification, and operator action is immutable and timestamped. Find the exact moment of failure.
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Notification delivery
Every send is logged. Replay any notification. Know who was paged, when, and whether they saw it.
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Evidence library
Automatic screenshots on failure, visual diffs, and SSL cert snapshots. Incidents have receipts.
Security
The boring parts, done right
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TOTP 2FA
Recovery codes included.
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RBAC
Owner / Admin / Editor / Viewer.
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AES-GCM
Encryption at rest.
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CSRF protection
Double-submit by default.
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Append-only audit
A durable operator trail.
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Session management
IP logging and control.
Why Sentinel
What sets Sentinel apart
CapabilityTypical toolSentinel
- Quorum-based incident detectionSingle-region triggerMulti-region quorum
- False positive rateHigh (flapping)Near-zero
- Browser/JS checkExtra toolBuilt in
- MetaMask/Web3 detectionNot availableBuilt in
- Notification delivery proofDid it fire?Full log + replay
- Audit trailEnterprise onlyDay one, all plans
- SSL expiry trackingSeparate toolEvery domain, automatic
- Critical bypass routingAll-or-nothing quiet hoursPer-channel bypass
sentinel.app · free during beta · invite-only
The website uptime monitoring tool that earns every alert it sends.
Add your domains, choose DNS, HTTP, SSL, or browser checks, and let 8 independent regions build the quorum that separates real incidents from regional noise. Full forensic evidence on every failure — screenshots, response chains, SSL details.
- Quorum detection — zero false-positive alerts
- 8 independent global monitoring regions
- AES-GCM encrypted · 2FA · RBAC
- Free Starter plan · invite-only beta