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Cron-like job scheduler for Elixir.

Financial Contributors on Open Collective Version Hex docs .github/workflows/elixir.yml Coverage Status

This README follows master, which may not be the currently published version. Here are the docs for the latest published version of Quantum.


To use Quantum in your project, edit the mix.exs file and add Quantum to

1. the list of dependencies:

defp deps do
  [{:quantum, "~> 3.0"}]

2. and create a scheduler for your app:

defmodule Acme.Scheduler do
  use Quantum, otp_app: :your_app

3. and your application's supervision tree:

defmodule Acme.Application do
  use Application

  def start(_type, _args) do
    import Supervisor.Spec, warn: false

    children = [
      # This is the new line

    opts = [strategy: :one_for_one, name: Acme.Supervisor]
    Supervisor.start_link(children, opts)


To see more transparently what quantum is doing, configure the logger to display :debug messages.

config :logger, level: :debug

If you want do use the logger in debug-level without the messages from quantum:

config :acme, Acme.Scheduler,
  debug_logging: false

If you encounter any problems with quantum, please search if there is already an open issue addressing the problem.

Otherwise feel free to open an issue. Please include debug logs.


Configure your cronjobs in your config/config.exs like this:

config :acme, Acme.Scheduler,
  jobs: [
    # Every minute
    {"* * * * *",      {Heartbeat, :send, []}},
    # Every 15 minutes
    {"*/15 * * * *",   fn -> System.cmd("rm", ["/tmp/tmp_"]) end},
    # Runs on 18, 20, 22, 0, 2, 4, 6:
    {"0 18-6/2 * * *", fn -> :mnesia.backup('/var/backup/mnesia') end},
    # Runs every midnight:
    {"@daily",         {Backup, :backup, []}}

More details on the usage can be found in the Documentation


This project uses the Collective Code Construction Contract (C4) for all code changes.

"Everyone, without distinction or discrimination, SHALL have an equal right to become a Contributor under the terms of this contract."


  1. Check for open issues or open a new issue to start a discussion around a problem.
  2. Issues SHALL be named as "Problem: description of the problem".
  3. Fork the quantum-elixir repository on GitHub to start making your changes
  4. If possible, write a test which shows that the problem was solved.
  5. Send a pull request.
  6. Pull requests SHALL be named as "Solution: description of your solution"
  7. Your pull request is merged and you are added to the list of contributors

Code Contributors

This project exists thanks to all the people who contribute.

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Become a financial contributor and help us sustain our community. [Contribute]



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Apache License, Version 2.0

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