Effortless Autoscaling for Ruby

Autoscale your Ruby web apps and job queues with ease, using request queue time and job queue latency.
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Judoscale scaling charts

Explore for yourself in our sandbox app →

Scaling is queue management. Queues ensure availability (no one is rejected when resources are busy), but create latency (waiting). Scaling is about ensuring both high availability and low latency, while minimizing cost.

Nate Berkopec
The Complete Guide to Rails Performance

All about queue time

Most autoscalers rely on generic metrics like CPU or memory, but queue time is the true measure of server capacity. Judoscale was built for queue time from the beginning.Learn more about request queue time

visualization of request queue time

Job queues, too!

Queue time isn’t just for web services. Judoscale also uses queue latency to autoscale your background workers, making sure your job queues never back up.

screenshot of web and worker instances in Judoscale

The fastest autoscaler

A capacity issue needs to trigger autoscaling as quickly as possible, and Judoscale is the fastest autoscaler available. Our autoscaling algorithm runs every 10 seconds, ensuring your app scales up before users notice an issue.

screenshot of scaling up fast

Reduce your hosting costs

Most Ruby applications are way overscaled, and Judoscale can help. Our precision autoscaling algorithm lets you scale down without sacrificing performance or peace of mind.

screenshot of a Heroku bill

Customize your autoscale behavior

Every Ruby app is different, and Judoscale gives you complete control. You can scale by multiple instances at a time and tweak the frequency of scaling. Each process is configured independently with a few simple sliders.Explore the configs in our sandbox app

screenshot of Judoscale configuration options
  • Trusted by
    900+
    engineering teams
  • Over
    2.5 million
    autoscales per month
  • Since
    2017
    we are here to stay

Supported Ruby Stacks

Judoscale’s deep integration with Sidekiq queues let us easily tag which queues we wanted a faster response. We were able to tune our scaling sensitivity for exactly our usage pattern of intermittent batches of large jobs.

Michael Buckbee
Founder, Gently Used Domains

If I was the king of the world, I would make it illegal to horizontally scale based on execution time. Scale based on queue depths, people!

Nate Berkopec
The Complete Guide to Rails Performance

I found Judoscale through Nate Berkopec’s Rails Performance workshop. Glad I did, because we’re very happy with Judoscale!

Eric Kurzenberger
Director of Engineering, Mitchell Stores

Chameleon has been extremely stable thanks to Judoscale. We have very high spikes in traffic, and I don’t even have to think about it.

Brian Norton
Co-founder & CTO, Chameleon

We could see the care in Judoscale’s documentation, the gems were well-documented and designed with a general sense of quality.

Sean Devine
CEO, XBE

We’re really impressed by the simplicity and ease of use of Judoscale. We’ve gone from constant worries over site performance, to complete confidence in our configuration. What a great tool!

Christopher Batts
Co-Founder & CEO, Setyl

Start autoscaling for free

Setup takes less than 5 minutes