Best free tier for docker

Fly.io

★ 49

True free allowance of small VMs near users worldwide.

Bandwidth: 160 GB/month
Requests: 3 shared-cpu-1x 256MB VMs
Paid from: $5/mo

Render

★ 41

Free web services + static sites; services sleep when idle.

Bandwidth: 100 GB/month
Requests: free web services spin down after 15 min idle
Paid from: $5/mo

Railway

★ 29

No true forever-free tier — $5 trial credit then Hobby ($5/mo).

Bandwidth: usage-based
Requests: $5 trial credit, then requires Hobby plan
Paid from: $5/mo