Fly.io runs your app on Machines: small virtual machines billed by the second while they run. The smallest shared-CPU machine costs $2.19 if it runs all month, and you can add memory at $6 per GB a month.
✓Good for
The lowest price for a small always-on service
Early-stage companies, which can apply for up to $15,000 in credit
!Watch out for
No free allowance is listed
A dedicated IPv4 address ($2 a month), volumes and support plans cost extra
Volumes are billed on the size you set up, not what you use
Listed prices are for Ashburn (US East); London costs about 1.135 times as much