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The bottom line
Good value for flexible app hosting and isolated code, but not the simplest or most predictable platform.
Fly.io is a flexible cloud platform for apps and isolated code workloads. The pricing page lists shared-CPU Machines from $2.19/month with 256 MB RAM, while Sprites are billed by CPU-hour and memory GB-hour. Fly says it has 18+ regions and a 99.9% uptime SLA; managed Postgres starts at $38/month.
The low Machine entry price is appealing, but it is not a free tier, and usage-based billing plus storage and egress charges can complicate cost estimates. Reddit users report rough documentation and deployment hiccups, though one user said the service became stable after initial problems. Fly lists paid support plans, starting at $29/month.
Good fit if
- Small apps with low baseline usage
- AI workloads needing isolated code sandboxes
- Teams wanting global Machine placement
Skip it if
- Teams that require a free tier
- Users who want a hands-off PaaS
- Teams seeking low-cost managed Postgres
ScoresHow it rates
What works
- Shared-CPU Machines start at $2.19/month with 256 MB RAM.
- Usage billing is by the second, hour or GB-hour.
- Sprites support isolated code environments with checkpointing and restore.
- Fly lists more than 18 regions and a 99.9% uptime SLA.
- Managed Postgres includes high availability, backups and connection pooling.
What doesn't
- No free plan is listed.
- The lowest-priced Machine has just 256 MB RAM.
- Managed Postgres starts at $38/month.
- Egress costs $0.02-$0.12 per GB, depending on region.
- Reddit users report rough documentation and deployment hiccups.
01What Fly.io actually does
Fly.io is a cloud platform for deploying apps and running workloads close to users. Its core product is Fly Machines: hardware-virtualized containers that, according to Fly.io, can launch instantly and run only when needed. Fly.io says deployments typically take 500ms; that is the company’s claim, not a benchmark we verified.
The platform also offers Sprites, hardware-isolated sandboxes for untrusted or AI-generated code. Fly.io says these environments can be checkpointed and restored. Storage options include local NVMe and global, durable object storage, while managed services include Postgres, Redis and Tigris object storage. Teams can also run their own datastore on a Machine.
Fly.io lists 18+ regions worldwide and a 99.9% uptime SLA. Its tools include CLIs, MCP servers and official plugins for agent-driven deployment, scaling and debugging. Pricing is usage-based, with no free plan listed.
02Where Fly.io is strong
Fly.io combines app hosting, isolated code execution and storage on one platform. That can suit teams deploying conventional services alongside agents or workloads that need to run untrusted code. Sprites can be checkpointed and restored, and Fly.io offers both managed database options and the choice to run a datastore on a Machine.
The listed entry price is low for a small always-on app: the shared-cpu-1x Machine is $2.19 per month for 1 shared CPU and 256 MB RAM, with a listed rate of $0.0030 per hour. Larger shared-CPU plans range from $4.39 to $17.55 per month. Pricing checked November 6, 2026; listed monthly prices have no annual billing option shown.
- Managed Postgres starts at $38 per month for 2 shared CPUs and 1 GB RAM. The listed Basic plan includes high availability, automated backups and connection pooling.
- Sprites are billed by CPU-hour and GB-hour: $0.0385 per CPU-hour and $0.021875 per GB-hour of memory. Hot storage is $0.50 per GB-month; cold storage is $0.02.
- Fly.io lists 18+ regions and a 99.9% uptime SLA, useful for teams that want to deploy across regions without managing their own servers.
03Where it falls short
The low entry price is not a predictable total bill. Machines, Sprites, storage and egress have separate rates, and usage can be billed by the second, hour or GB-hour. Egress is listed at $0.02/GB in North America and Europe, $0.04/GB in Asia Pacific, Oceania and South America, and $0.12/GB in Africa and India. There is no free plan listed, and monthly prices do not show an annual discount.
Capacity and add-ons can move costs up quickly. Managed Postgres storage costs $0.28 per GB, with a 1,000 GB maximum per cluster. Extra Machine RAM is $6 per GB per month, up to 128 GB; Machine volumes and stopped Machine rootfs each cost $0.15 per GB per month. Managed Postgres plans range from $38 to $1,922 per month. Standard support costs $29 per month and lists a 36-hour first response; Premium is $199 with a 24-hour first response and a 1-hour urgent response.
Usability and support are less certain. In Reddit discussions, some users describe Fly.io as rough, report deployment hiccups, or say they had to search forums for documentation answers. Those are individual reports, not proof of a current platform-wide problem, but they are worth weighing if you need a highly managed migration.
04Fly.io pricing: what you'll actually pay
Fly.io lists no free plan. The smallest shared Machine is $2.19/month for 1 shared CPU and 256 MB RAM; the 2-CPU, 512 MB tier is $4.39/month. That price roughly doubles at each step: shared-cpu-4x is $8.78, while dedicated performance starts at $33/month for 1 CPU and 2 GB RAM. These are listed monthly prices, not annual commitments; usage is billed by the second, hour or GB-hour, so your bill depends on runtime and resources used.
Sprites have no fixed monthly price: CPU is $0.0385 per CPU-hour and memory is $0.021875 per GB-hour, plus hot storage at $0.50/GB-month or cold storage at $0.02. Managed Postgres starts at $38/month, a steep step up from a small Machine. Watch add-ons: Machine volumes and stopped-Machine rootfs each cost $0.15/GB-month, and egress ranges from $0.02 to $0.12/GB by region. The first 10 GB of snapshots per month is free; extra RAM is $6/GB-month.
05Switching to (or from) Fly.io
Moving to Fly.io means fitting your app to its Machines and deployment model; the effort will depend on your app and its dependencies. Fly.io also offers Sprites for isolated code, storage options and managed databases, so switching a database or storage layer may be a separate project from moving the app. The published material does not specify migration tooling or data-export steps. Confirm export formats, backup access and restore procedures before moving production data.
Leaving may be straightforward for a portable app, but workloads tied to Fly-specific deployment, sandbox or storage features could take more work to replace. That is a practical lock-in risk, not a claim that export is impossible. We don’t have Reddit posts or comments in the published material for this review, so we can’t verify what users there cite as reasons for leaving. Before switching, price your actual compute, storage, egress and database needs; the published entry price alone won’t predict the bill.
From the threadsWhat users say
The Reddit accounts are mixed: some describe Fly.io as much cheaper than Heroku and stable after initial issues, while others call it rough, slow to deploy, hard to document, or concerning after downtime. These are individual reports, not a reliable measure of current service quality.
deployments are slow, it seems a bit underdeveloped and opaque in pricing
so far it seems to be about 1/8th the price too (~16/mo on heroku and like 2-3/mo on fly)
I've found myself scouring their forums for answers that should be in the main documentation
In my case, deployment was actually broken for a couple of days. If this had a happened on a real production app, I'd be a sad.). Since then though, it's been stable
Questions people ask
Does Fly.io have a free plan?
Fly.io does not have a free plan, according to the published pricing data. A free trial is not published there either, so we can’t confirm one. The lowest listed Machine is shared-cpu-1x at $2.19 per month for 1 shared CPU and 256 MB RAM; usage is billed by the second, hour or GB-hour.
How much does Fly.io cost?
Budget beyond the headline Machine price. The pricing data lists shared-cpu-1x at $2.19 monthly, but also lists storage, snapshots, egress and dedicated IPv4 charges; North America and Europe egress is $0.02/GB. Managed Postgres starts at $38/month. Total cost depends on your running resources and add-ons, not just the smallest Machine.
Is Fly.io down right now?
We can’t confirm whether Fly.io is down right now: the published materials contain no live status feed or incident history. A Reddit user described a deployment broken for a couple of days, while another reported downtime during a migration. Those are user accounts, not evidence of current availability. Fly.io lists a 99.9% uptime SLA.
Is Fly.io trustworthy for production apps?
The product information lists a 99.9% uptime SLA, and Fly.io’s managed Postgres plans include high availability and automated backups. Reddit reports are less reassuring: users describe deployment problems and migration downtime, alongside one report that the service later became stable. Treat those comments as individual experiences, not a measure of present reliability.
What should we check before choosing Fly.io?
Check whether you’re comfortable managing Machines and reviewing usage-based charges. Fly.io lists 18+ regions, deployment and debugging tools, and managed database options. But Reddit users have called deployments slow and documentation hard to find. If you need predictable billing or hands-on transition support, review the listed add-on costs and support response times before committing.