SteelreedSteelreed

Open-source tools for the parts of your backend nobody is watching.

Steelreed is a small studio in Vietnam. We build developer tools you can run on your own server for free, and run them for you when you would rather not.

See Cronbell Steelreed on GitHub
CronbellTelegram · #ops

close-month missed its 02:00 run. Last success Oct 9 at 02:00, 38 s.

QueryFence./mvnw verify
[tenant-isolation] MISSING_PREDICATE
  table   : invoice
  sql     : select … from invoice where status=?
  origin  : InvoiceService.java:20 #openInvoices
BUILD FAILURE

Products

Each one is open source, does one job, and tells you plainly when something is wrong.

Beta · self-host it today

Cronbell

Self-hosted service

Monitoring for cron jobs, scheduled tasks and background workers. Add one line to a job and get a message on Telegram, Slack or email when it misses a run, fails or runs too long. Self-host it with one Docker command.

Docker · Linux cron · Kubernetes · Spring Boot · AGPL-3.0

Learn more
0.1.0 · Maven Central

QueryFence

Java library

SQL checks for Java tests. It fails the build when a query your tests run forgets its tenant filter, and names the line that wrote it.

Java 17+ · Spring Boot · JUnit 5 · Apache-2.0

Learn more

How we build

Four rules every Steelreed tool follows. If a release breaks one, it is a bug.

  • Self-hosting is the full product.Nothing is removed from the open-source version to sell the cloud one. The cloud sells not having to run it.
  • When unsure, say so.A tool that cannot tell whether something is safe reports it. It does not stay quiet and hope.
  • Show the misses too.We test our tools on real applications and publish the false alarms with the real catches.
  • Small releases, dated changelog.Every change goes through a pull request and CI, and every release says what changed.

Updates

  1. Cronbell 0.1.0-beta.3: status history and uptime, Discord and ntfy, per-check alert channels; the Spring Boot starter is on Maven Central.

  2. Cronbell 0.1.0-beta.1 is out: one Docker image for amd64 and arm64, source on GitHub.

  3. Blog: 15 tenant leaks in 75 queries, what QueryFence found in an app it was not designed around.

  4. Started Cronbell, open-source cron job monitoring. Early access is open.

  5. QueryFence 0.1.0 is on Maven Central as com.steelreed:queryfence-spring-test.

  6. QueryFence dogfood report: on an application it was not written for, 75 statements checked, 15 real leaks found, 4 false alarms.

Contact

Questions, ideas, or a job that broke at 2 a.m. and nobody noticed: write to us.