Dead Man's Snitch Explained: How It Works & Its Limits

What Is Dead Man's Snitch?

"Dead man's switch" is the generic concept: a mechanism that assumes something has gone wrong if it stops hearing from you, rather than waiting for an explicit failure signal. The term comes from railway and industrial safety equipment — a lever or pedal that triggers an alarm the moment a human operator lets go.

Dead Man's Snitch is the specific SaaS product that borrowed that name and applied it to cron jobs and scheduled tasks. Instead of watching your server for errors, it waits for your job to "check in" on a schedule; if the check-in doesn't arrive, it assumes the job died and alerts you. The product was built by Collective Idea, a software consultancy, and has run long enough to become one of the default names people reach for when searching for cron monitoring — to the point that many developers use "dead man's snitch" as shorthand for the whole category, even when they mean the general pattern rather than this particular tool.

That conflation matters. Knowing the difference between the concept and the product helps you evaluate whether the specific implementation — and its limitations — actually fits what you're trying to monitor.

How the Snitch Model Actually Works

The mechanics are deliberately simple. You create a "snitch" in the dashboard, and the service generates a unique snitch URL — essentially a private token embedded in a link. Your job pings that URL every time it completes successfully, typically with a one-line curl command tacked onto the end of a script or added as a new step in a cron entry. This is curl-based cron monitoring in its purest form: no agent to install, no API client, just an HTTP GET or POST fired off after your task finishes.

When you set up the snitch, you also define a check-in interval — hourly, daily, weekly, or a custom cadence matching how often the job should run. Dead Man's Snitch tracks the last time it heard from you and compares that against the interval, plus a short grace period. If the ping doesn't land in the expected window, the snitch flips to "missing" status and fires an alert through whatever channel you've configured — email, Slack, PagerDuty, and similar integrations.

For teams who want more than a binary check-in, Dead Man's Snitch also offers Field Agent, a small CLI wrapper you run around your actual command. Field Agent watches the exit code of the wrapped process and can report a distinct "error" state — not just silence, but a nonzero exit — along with captured output. It's a meaningful step up from a bare ping, and worth knowing about since it's the closest the product gets to real execution detail.

Pricing and Plan Limits

The free plan is intentionally minimal: Dead Man's Snitch's FAQ confirms one snitch, standard check-in intervals, and basic email alerting. That's enough to monitor a single critical backup job or nightly script, but not much beyond that.

Paid plans scale up by snitch count and feature set — more snitches, shorter intervals, team member seats, and integrations like Slack or PagerDuty. Independent tracking of the company, including the Tracxn company profile, confirms its history as a long-running Collective Idea product with a tiered pricing structure rather than a flat per-snitch fee. If you're watching more than a handful of jobs, or need faster-than-daily granularity, you'll outgrow the free tier quickly and land in the paid range.

Where the Dead-Man's-Switch Model Falls Short

Here's the structural limitation, and it applies to every ping-based tool, not just this one: a missing check-in tells you that something didn't happen, never why. The alert says your job failed to ping on schedule — it says nothing about whether the job crashed on line 40, timed out waiting on a database connection, ran twice, or simply hasn't started because a queue is backed up. Field Agent narrows that gap slightly by capturing an exit code, but it still doesn't give you a searchable history of runs, response bodies, or timing trends.

This is a known blind spot across the category — we've covered the same gap in more depth in our healthchecks.io review, which faces an almost identical ceiling. If your job fails silently — say, it exits 0 but writes corrupted output, or hangs and never reaches the ping line — a pure heartbeat monitor may not even register a problem until the next scheduled window closes. You get an alert, but you're still opening logs, SSHing into a box, or guessing, because the tool wasn't built to keep execution history in the first place.

When Cronevra Is the Better Fit

If your scheduled jobs run over HTTP — API polls, webhook processors, data syncs triggered by a request rather than a raw shell script — you're a good candidate for something built around execution history rather than a bare check-in. Cronevra monitors HTTP-triggered cron jobs and keeps a record of what actually happened on each run: response codes, timing, output snippets, and a timeline you can scroll back through instead of a single "last seen" timestamp.

That distinction matters most at the recovery stage. A missing-ping alert tells you a job stopped checking in; Cronevra aims to tell you what the job returned, how long it took relative to its usual pattern, and whether the failure looks like a one-off blip or a repeating problem — the detail you need to actually fix things, not just get notified something's wrong. For teams evaluating a dead man's snitch alternative because they've hit the one-snitch ceiling or want more than exit-code detail, this is the practical next step up. Check the Cronevra pricing page to see current tiers.

Dead Man's Snitch does its narrow job well: it's cheap, simple, and reliable for "did this run at all" questions. But if you need "did this run correctly, and here's proof," that's a different tool.

If you just need a heartbeat, a basic snitch is fine. If you need to know what actually happened — and get real recovery detail when it doesn't — try Cronevra or compare tiers on the pricing page.

Frequently Asked Questions

Is Dead Man's Snitch the same thing as a 'dead man's switch'?

No — "dead man's switch" is the generic safety concept borrowed from railway and industrial equipment, describing any system that alerts when expected input stops arriving. Dead Man's Snitch is a specific commercial SaaS product, built by Collective Idea, that applies that concept to cron job and scheduled task monitoring.

How much does Dead Man's Snitch cost?

The free plan includes one snitch with standard check-in intervals and basic alerting, per the product's own FAQ. Paid plans scale by snitch count and feature access, including shorter intervals and team integrations, with pricing tiers confirmed by independent sources like Tracxn's company profile.

What's the difference between Dead Man's Snitch and healthchecks.io?

Both are ping-based, heartbeat-style monitors that alert on a missing check-in rather than watching execution directly. The differences are mostly in interface, integrations, and self-hosting options — healthchecks.io offers an open-source self-hosted version — but both share the same core limitation of not capturing execution detail, as covered in our healthchecks.io review.

Can Dead Man's Snitch tell me why my cron job failed, not just that it didn't run?

Not by default — a standard snitch only knows whether a ping arrived on schedule. The Field Agent CLI wrapper adds exit-code detection, distinguishing a crash from silence, but it still doesn't provide full execution history or output logging the way a purpose-built execution monitoring tool does.

Do I need to change my crontab syntax to use Dead Man's Snitch or a similar tool?

No — you keep your existing crontab entry and simply add a curl command pinging your unique snitch URL when the job succeeds. No changes to the cron schedule syntax are required, though you do need to choose a check-in interval in the dashboard that matches your job's cadence.

What happens if I exceed the free plan's one-snitch limit?

You'll need to upgrade to a paid tier to monitor additional jobs, since the free plan caps out at a single snitch. Teams monitoring more than one scheduled task, or wanting shorter intervals and richer alerting, typically move to a paid plan or evaluate an alternative tool with a more generous free tier or deeper monitoring features.