Stop worrying about
what might break

Dead simple monitoring for your SaaS infrastructure. Monitor uptime, domains, LLM costs, and more. Get notified before your users do.

 
sentinelboard.com/dashboard
Web Availability
https://myapp.com
142ms
Domain Expiration
myapp.com
12 days
Heartbeat
Deploy Agent
Healthy
Last seen 2m ago
Credits
OpenRouter
$24.80
Email
Slack
Telegram
Webhooks

What breaks when you're not watching?

Every one of these is preventable with the right alert at the right time.

Your site goes down and you find out from a customer tweet. Hundreds of others left without telling you a thing.

Database backup silently stops running. You find out when you need to restore half year later.

An API changes its response format and your app silently breaks. The page is up but functionality is broken.

The domain renewal email went to an inbox nobody checks. Suddenly your website, email, and login system stop working.

...and a hundred other things can ruin your business when you're not watching.

Unmonitored systems leading to major failures and business impact

Built for indie makers

No time for setting up Prometheus and Grafana. You need monitoring that just works.

Super simple setup

No complex configuration. Add your endpoints and you're done. Works with any stack.

Pay as you use

Variable pricing that scales with your needs. Less usage means less cost.

Multiple channels

Get notified via email, Slack, Discord, SMS, or webhooks. Your choice.

LLM Anomaly Detection

Detect unusual spikes in LLM costs and token usage automatically. Get alerted before your bill explodes.

Built-in LLM Observability

Track every OpenRouter call, monitor your credit balance, and get alerted when costs spike. Built-in anomaly detection catches unusual spending patterns automatically.

Track Every Call

Monitor every LLM API call with OpenTelemetry. See model, provider, tokens, cost, and duration in one place.

Credit Monitoring

Never run out of OpenRouter credits unexpectedly. Get alerted when your balance drops below your threshold.

Anomaly Detection

Z-score analysis on hourly cost and token data. Catch unusual spikes automatically before they hurt.

OpenRouter Traces
Cost Overview
Anomaly Detected
Total Cost
$4.23
Tokens
142k
Traces
847
Hourly Cost
Recent Traces
gpt-4.1-mini
1.2k$0.003
claude-sonnet-4-5
3.4k$0.012
gpt-4.1-mini
24k$0.087

Everything you need to monitor

One dashboard for all the things that keep you up at night.

Web Availability

Know when your website is slow or down before your customers do

200 OK

Domain Expiration

Never forget a domain expiration date again

347 days

API Calls

Validate API responses return the data you expect, not just 200 OK

Healthy

Cron Heartbeat

Detect missed or late scheduled jobs instantly

On time

LLM Calls

Track LLM API calls, failures, and tokens

Running

VPS / Hosting

Never forget a hosting renewal date again

Renewed

OpenRouter Credits

Monitor your LLM API spend and balance

$24.80

Error Tracking

Catch failed API calls and error spikes early

0 errors

and more...

We'll let you know when something needs your attention

Get alerted on the channels you already use. No new apps to install, no notification fatigue — just the right signal at the right time.

Email
Slack
Telegram
Webhooks

Stop worrying. Start shipping.

Join hundreds of indie developers who sleep better knowing their apps are monitored 24/7.

Free tier available · No credit card required