Fleet vs Helios: What are the differences?

What is Fleet? Container management and deployment for your cluster. Fleet is a low-level cluster engine that feels like a distributed init system. With fleet, you can treat your CoreOS cluster as if it shared a single init system.

What is Helios? Docker container orchestration platform, by Spotify. Helios is a Docker orchestration platform for deploying and managing containers across an entire fleet of servers. Helios provides a HTTP API as well as a command-line client to interact with servers running your containers.

Fleet and Helios belong to "Container Tools" category of the tech stack.

Some of the features offered by Fleet are:

• Deploy docker containers on arbitrary hosts in a cluster
• Distribute services across a cluster using machine-level anti-affinity
• Maintain N instances of a service, re-scheduling on machine failure

On the other hand, Helios provides the following key features:

• Helios is pragmatic.
• Helios fits into the way you already do ops.
• Hihgly scalable

Fleet and Helios are both open source tools. Fleet with 2.45K GitHub stars and 309 forks on GitHub appears to be more popular than Helios with 2K GitHub stars and 229 GitHub forks.