Stop worrying about
what might break

Uptime, APIs, cron jobs, errors, and LLM costs - one place to monitor everything that quietly breaks. Built for indie makers and small teams.

No credit card required · No agents to install · First monitor in under a minute

 
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
Discord
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

Replace your monitoring patchwork

Uptime pinger, error tracker, cron monitor, and LLM cost dashboard - all in one tool instead of four.

One command center

Monitor the parts of your business that need attention.

Keep track of what customers feel, what background systems depend on, and what your AI stack is spending, all in one place.

Signals watched
8
Alert channels
5
Coverage
24/7

Customer-facing issues

Watch the parts of your product customers notice first: uptime, working APIs, and error spikes.

Jobs, renewals, and deadlines

Cover the quiet failures that hurt later: missed cron jobs, forgotten renewals, and expiring infrastructure.

LLM usage and spend

Monitor provider activity, unusual token spikes, and balance risk before your bill surprises you.

Add more monitors as your stack grows without turning the page into another checklist.

Surface area

Customer-facing issues

Watch the parts of your product customers notice first: uptime, working APIs, and error spikes.

Web Availability

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

No code - paste your URL

200 OK

API Calls

Validate response body content, headers, and status codes. Not just a ping - actual payload checks.

No code - paste your endpoint

Healthy

Error Tracking

Sentry-compatible SDKs. AI-powered error explanation. Smart grouping to cut through noise.

Sentry SDK integration

0 errors

Built-in LLM Observability

LLM observability via OpenTelemetry - works across providers. Track calls, tokens, and costs per model. Built-in anomaly detection catches unusual spending patterns automatically.

Track Every Call

OpenTelemetry-based tracing. See model, provider, tokens, cost, and duration per request across any LLM provider.

Credit Monitoring

Track your OpenRouter credit balance in real time. Get alerted when it drops below your threshold.

Anomaly Detection

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

LLM 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

Built for indie makers and small startups

You need monitoring that is quick to set up, affordable to start, and focused on the problems that actually matter.

Add your URL. Get alerts in 60 seconds.

No YAML. No agents. No 30-minute setup wizard. Paste your endpoint and start monitoring.

Free to start

Start on the free tier for side projects, then move to an affordable paid plan when you need more coverage.

Built for lean teams

Made for indie makers and small startups that need useful monitoring without a dedicated ops team.

Covers the essentials

Monitor uptime, APIs, cron jobs, domains, and other quiet failures before they become customer-facing problems.

We'll let you know when something needs your attention

Alerts should fit into your workflow, not force you into another dashboard.

Alert delivery

Get notified on the channels you already use. No new app to learn, no giant alert center to babysit, just a direct message when something actually needs intervention.

Use the channels you already check.

Route noisy events away from your main inbox.

Keep critical alerts impossible to miss.

Choose where the alert lands. Keep urgent issues close and lower-priority signals somewhere quieter.

Email
Slack
Telegram
Discord
Webhooks

You know what can break. Now keep an eye on it.

Replace your uptime pinger, error tracker, and cron monitor with one tool. Free to start, no credit card needed.

First monitor live in under a minute · Free tier included