DeployAngel

Release clearance for Rails

Know when every release is safe to stop watching.

CI tells you your code passed its tests. DeployAngel tells you it passed production: after each deploy it compares real traffic against your last healthy release, then clears it, fails it, or says exactly what it's still waiting to see.

Start free Add to Heroku

One gem. No dashboards or thresholds to configure.

Cleared

v381 cleared for normal traffic

12 min after rollout · promoted from staging v57, which was cleared

Confidence
High
Routes exercised
31 / 33
Requests
18,204
  • HTTP 5xx rate0.12% → 0.10%
  • Background jobsall normal
  • Checkpoint order.created412 expected · 405 seen
  • Still watchingNightlyInvoiceJob by 03:00 EDT

You ship more often than ever.

Coding agents write a lot of the code now. Releases go out daily, and nobody has time to stare at dashboards after each one.

Monitoring tells you something is wrong.

Error trackers and APM are great at alerts. None of them tell you a specific release is done, safe, and no longer worth watching.

DeployAngel gives every release a verdict.

Cleared, failed, or not cleared yet, with the evidence behind it: what ran, what didn't, and what it's still watching for you.

How it works

From deploy to verdict, without setup

  1. 1

    Add the gem

    The agent aggregates requests, jobs, and exceptions in memory and sends one small payload a minute. No code changes.

    # Gemfile
gem "deployangel"
  2. 2

    Deploy as usual

    DeployAngel notices each new release on Heroku, Kamal, Render, Fly.io, or your own servers. Registering from CI adds a link to the run.

    # Optional, after deploying
deployangel release
  3. 3

    Get a verdict

    DeployAngel compares the release with your last healthy one and clears it once enough normal behavior has run. Failures alert immediately.

    ✓ Cleared ✕ Failed ! Not cleared yet

What it checks

Catches what error trackers miss

Regressions, per route and job

Error rates and latency for every route, failure rates and durations for every job class, each compared with the last healthy release.

Work that silently stops

Add DeployAngel.checkpoint("order.created") and a release fails if orders stop, even when every request still returns 200.

Recurring jobs that skip a run

It learns your schedules and keeps watching after clearance. A missed nightly job revokes the release's clearance.

Rare paths, watched after release

Password resets and sign-ups that changed but haven't run yet are flagged, and you're alerted if they fail the first time they do.

Points at the cause

Failures show the affected routes and jobs, new exceptions, and the changed files most likely responsible, with optional AI investigation.

Honest about low traffic

Quiet apps and after-hours deploys wait for normal activity instead of guessing, and the clearance report says what couldn't be observed.

Built for coding agents

Your agent ships the release. Now it can check it too.

The deployangel CLI and MCP server let Claude Code, Cursor, or CI wait for a release's verdict and read the evidence when it fails. Stable exit codes mean a pipeline can stop on a bad release without anyone watching.

  • ✓ Read-only tokens for agents and developer machines
  • ✓ "No problems so far" is never reported as cleared
  • ✓ Works with any agent that supports MCP
$ bundle exec deployangel verify --wait
Waiting for v381… observing, 6 min of traffic
Waiting for v381… initial check: no problems so far

v381 cleared for normal traffic at 14:12 UTC (12 min after rollout)
State: closed · Verdict: verified · Confidence: high · Coverage: 94%
Still watching:
  NightlyInvoiceJob (expected by 03:00)
Changed but not yet exercised:
  POST /password_resets
$ echo $?
0

Safe to install

Never in your request path

No network calls in requestsEverything is aggregated in memory and sent from a background thread once a minute.

No user dataRoute patterns, counts, and sanitized exceptions. Never request bodies, parameters, or source code.

Fails openIf DeployAngel is unreachable, your app is unaffected and telemetry is simply dropped.

Stop watching dashboards after every deploy.

Free while in beta. Ruby on Rails 7.1+ on Heroku, Kamal, Render, Fly.io, or anywhere Rails runs.

Start free See pricing