Live monitoring
Status refreshes continuously. Pause, resume or force a refresh whenever you like.
Built with Rust
→
Know the moment
Know the moment
something goes down.
Sentinel watches your hosts, ports and endpoints around the clock — with live latency, uptime history and instant status at a glance. Fast, rock‑solid and remarkably light on resources.
✓ Single native binary
✓ No runtime, no garbage collector
✓ Your data stays on your machine
Stable
Runs for months, not hours
Rust's compiler rules out null pointers, data races and memory corruption before the program ever ships. A monitor has to outlive the things it monitors — Sentinel is built to.
Fast
Sub‑millisecond precision
Native code and async I/O mean checks fire on time and latency is measured, not estimated. With no garbage collector there are no pauses to skew your numbers.
Lightweight
Barely there
No bundled browser, no interpreter, no background daemons. One small binary that idles near zero CPU and leaves your memory for the work that matters.
Features
Everything you need. Nothing you don't.
One clean overview for every host you care about — from the router in the closet to production APIs.
Ping, TCP & HTTPS
Check a bare IP, a specific port or a full HTTPS endpoint — mix them freely in one list.
Latency & uptime
Current latency, rolling average and uptime percentage for every host, always in view.
History at a glance
Green and red history bars show exactly when things broke — and when they came back.
Zoom through time
Switch between Live, 15 minutes, 1, 6 and 24 hours — or everything Sentinel has ever recorded.
Clear failure reasons
Operational, degraded or down — with the reason spelled out, so you know where to look first.
🦀 Powered by Rust
Built with Rust,
from the first line.
A monitoring tool is only useful if it's the last thing standing. That's why Sentinel is written in Rust — the language trusted for operating systems, browsers and network infrastructure.
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1
Memory safe by design
Whole classes of crashes and leaks are rejected at compile time — so long-running sessions stay flat and predictable.
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2
Native speed, zero GC
Compiled straight to machine code with no garbage collector. Checks run concurrently without stalling each other.
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Tiny footprint
No VM, no interpreter, no runtime to install. A single self-contained binary that starts instantly.
sentinel — checks
$ sentinel --watch
● gateway 192.168.1.1 0.9 ms
● api https://api.example.com 24.1 ms
● db 10.0.0.12:5432 1.3 ms
● staging 10.0.0.40:443 timed out
3 operational · 0 degraded · 1 down
refreshed continuously
Illustrative output
How it works
Up and watching in under a minute
01
Add a host
Hit + and enter an IP, a host:port or an https:// URL.
02
Sentinel starts checking
Checks begin immediately and run continuously in the background — no configuration files required.
03
See everything at once
Operational, degraded and down counts, average latency and per-host history on a single screen.
Stand guard over your uptime.
Fast, stable and lightweight — Sentinel keeps watch so you don't have to.