Fly.io vs Heroku

Fly.io is strongest for full-stack apps needing global low latency. Heroku is strongest for teams migrating away. Here's how they stack up on price, uptime, and support.

Feature	Fly.io	Heroku
Starting price	$0.01/mo	$3/mo
Best for	Full-stack apps needing global low latency Docker-native deploys Small teams wanting per-second billing Postgres close to compute	Teams migrating away Legacy Rails/Node apps Historical PaaS comparison
Stated uptime SLA	No blanket platform SLA published; Enterprise support plans include custom SLAs	99.5% (Postgres Essential); higher SLAs on Standard/Premium/Private/Shield not separately published
Storage	SSD	SSD
Regions	35	2
Managed Kubernetes	Yes	No
Support channels	Community forum, Docs, Ticket (paid support plans), Enterprise Slack (Enterprise plan)	Ticket, Docs (Dev Center), Community forum
Compliance	SOC 2	SOC 2, HIPAA (Shield tier only), GDPR, PCI (Shield tier only)
Hidden costs to watch for	Machine prices vary by region -- the reference/base rates in this dataset are for the Amsterdam (ams) region; several regions carry a price premium Extra RAM beyond a preset's base allocation is billed separately (~$5 per 30 days per additional GB, prorated per-second) Stopped Machines still incur a rootfs storage charge of $0.15/GB per month Volume snapshots are billed at $0.08/GB per month above the first 10GB free per month Dedicated (non-shared) egress IPs are billed hourly (~$0.005/hr, ~$3.60/mo) in addition to the free shared IPv4 Cross-region private networking traffic is billed per GB and varies sharply by region group (Africa/India up to $0.12/GB egress) Wildcard/extra SSL certificates beyond the first 10 free per org are billed monthly	Eco dynos ($5/mo flat) are personal-account only and not available to Enterprise/Team customers Postgres Essential tier has no fork/follow, no HA, and only 99.5% uptime SLA -- a hidden reliability cliff vs. Standard Add-on overages (Postgres row/connection limits, Redis memory limits) can force an unplanned upgrade to the next tier Performance dynos require an established payment/billing history before they can be provisioned Private Spaces and Shield Private Spaces carry a substantial network-isolation premium (2-3x) over common-runtime equivalents Heroku Postgres Advanced tier pricing is not published; requires contacting sales
Last reviewed	2026-07-18	2026-07-18