Fly.io vs Koyeb
A side-by-side, data-driven comparison of Fly.io and Koyeb — pricing, free tiers and capabilities.
Both run containers on a global edge with usage-based pricing; Koyeb leans serverless with scale-to-zero while Fly gives lower-level control over machines and regions — but note Koyeb's free tier is closed to new signups since its 2026 Mistral acquisition.
At a glance
- At a medium always-on instance they're similarly priced (~$10.7/mo vs ~$10.71/mo).
Specs side by side
Estimated cost
Estimated monthly cost of a single always-on service — estimates, not quotes. Try the calculator for your own traffic. “—” means no verified price for that tier.
| Fly.io | Koyeb | |
|---|---|---|
| Small (~0.5 vCPU / 512MB–1GB) | $5.7 | $5.36 (lower) |
| Medium (~1 vCPU / 2GB) | $10.7 (lower) | $10.71 |
| Large (~2 vCPU / 4GB) | $21.4 (lower) | $21.43 |
| Egress ($/GB) | $0.02 | $0.02 |
Pros & cons
Our editorial assessment — not vendor-stated facts. Last reviewed 2026-07-16.
Fly.io
Pros
- Runs full Docker containers globally, not just functions, so it fits stateful and long-running apps
- CLI- and config-driven workflow makes provisioning multi-region deployments straightforward
- Usage-based billing charged per second, with no required monthly plan commitment
- Places compute close to users, which suits latency-sensitive applications
- Includes stateful primitives (volumes, managed Postgres, private networking) that many edge/PaaS platforms lack
Cons
- Has had publicized reliability incidents in recent years (some community reports attribute past outages to internal service-discovery systems); check Fly's status page and recent incident history before committing
- Uptime SLA is offered only to Enterprise-plan customers; standard pay-as-you-go usage carries no contractual uptime guarantee
- Billing can be hard to predict once you scale across instances and regions, and some users report unexpected charges
- CLI- and config-first, region-centric model has a steeper learning curve than conventional click-to-deploy PaaS
Koyeb
Pros
- Simple Git-to-deploy and container workflow that abstracts away most infrastructure management
- Runs workloads on bare-metal-backed microVMs with global geographic distribution
- Scale-to-zero plus per-second billing, so idle services cost little
- Expanding GPU and AI-inference capabilities that go beyond a typical PaaS
Cons
- The Mistral AI acquisition is steering Koyeb toward AI infrastructure (positioned as part of Mistral Compute), creating uncertainty about its long-term commitment to general-purpose web hosting
- Following the acquisition, the free (Starter) tier is closed to new sign-ups: new accounts must start on a paid plan, and a credit card is required to register
- Smaller ecosystem, integration catalog, and community than the major clouds or larger PaaS competitors
- Managed data services center on Postgres, with no broad catalog of managed databases, queues, or caches
Bottom line
Pick Fly.io for latency-sensitive apps that need multi-region by default. Pick Koyeb for serverless-style container apps deployed to the global edge.
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Frequently asked questions
- What is the difference between Fly.io and Koyeb?
- Fly.io: Runs full-stack apps and Docker containers as lightweight VMs in many regions, with a focus on low-latency, globally-distributed deployments. Koyeb: A serverless platform to deploy apps and Docker containers globally with autoscaling.
- Is Fly.io or Koyeb cheaper?
- They're similarly priced for a medium always-on instance (about $10.7/mo vs $10.71/mo). Actual cost depends on your usage.
- Does Fly.io have a free tier?
- No.
- Does Koyeb have a free tier?
- No.
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