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It's a split decision.
Choose Fly.io when you need configurable Machines, hardware-isolated code sandboxes, or managed Postgres alongside your app. Choose Vercel for a managed deployment platform with a free non-commercial tier, global delivery, and built-in agent tools and model access. Fly.io charges for compute and related resources; Vercel combines plan prices with usage-based charges. Check the expected compute, transfer, storage, and feature usage before comparing bills.
01Side by side
| Fly.io | Vercel | |
|---|---|---|
| Pricing model | Machine, storage, database, and egress charges | Plans plus metered platform features |
| Free tier | No free plan listed | Hobby is free for non-commercial projects |
| API and SDKs | CLIs and MCP servers; no SDK named | API, CLI, MCP, and Skills |
| CLI and agent tooling | CLIs, MCP servers, and official plugins | API, CLI, MCP, and Skills |
| Integrations | Frameworks, Docker, languages, and coding agents | 400+ models |
| Deployment model | Hardware-virtualized Machines and isolated Sprites | Deployment environments, functions, and sandboxes |
| Platforms | Web | Web |
| Global delivery and scale | 18+ regions; 99.9% uptime SLA listed | Global delivery; Enterprise 99.99% SLA |
Fly.io Choose Fly.io if
- Choose Fly.io if you need configurable Machines and managed Postgres.
- Choose Fly.io if you run untrusted or AI-generated code in Sprites.
- Choose Fly.io if you want to use Docker or your own datastore.
Vercel Choose Vercel if
- Choose Vercel if a free non-commercial tier fits your project.
- Choose Vercel if you want deployment environments and global delivery.
- Choose Vercel if your agent workflow needs MCP, Skills, or model access.
02Pricing at real usage
Fly.io has no free plan listed. Its shared-cpu-1x Machine is $2.19 per month for 1 shared CPU and 256 MB RAM; the listed rate is $0.0030 per hour. Machines are billed by the second, hour, or GB-hour, and extra costs can include storage and regional egress. Managed Postgres Basic starts at $38 per month, with 2 shared CPUs, 1 GB RAM, high availability, backups, and connection pooling. Vercel’s Hobby plan is $0 for non-commercial projects and includes 1M CDN requests and 100 GB data transfer per month. Pro is $20 per month with a $20 monthly usage credit. Vercel bills additional features separately: for example, Fluid Active CPU starts at $0.128 per hour and function invocations at $0.60 per 1M. Neither page lists annual rates.
03API, SDKs and integration
Fly.io lists CLIs and MCP servers for agent-driven deployment, scaling, and debugging, plus official plugins for Claude Code, Codex, Cursor, and OpenCode. Its Sprites MCP server works with agents that speak MCP. The listed framework and runtime ecosystem includes Phoenix, SvelteKit, Ruby on Rails, Docker, Django, Laravel, Next.js, Go, and Rust. Fly.io also describes Machines, storage, and managed databases as deployment options. Vercel offers an API, CLI, MCP, and Skills for coding agents, and says its platform supports 400+ models. Its product features include deployment environments, serverless functions, sandboxed environments, and AI Model Gateway. The product pages name no language-specific SDKs for either platform. Fly.io’s listed integrations lean toward frameworks, containers, and coding agents; Vercel’s agent surface includes model access as well as deployment. Confirm API behavior and SDK availability against the vendors’ current developer documentation before choosing an integration path.
04Open source, self-hosting and lock-in
The vendor pages do not state whether either platform is open source, self-hostable, or offers a platform-wide data export path. Fly.io says teams can use the same primitives as they scale and lists Docker, Machines, volumes, and the option to run their own datastore on a Machine. Those choices can help keep application components familiar, but the Machine and storage setup still depends on Fly.io’s platform. Vercel provides deployment environments, serverless functions, and platform services such as Blob storage and AI Gateway; replacing those services may mean changing application configuration and integrations. Neither platform’s listed features establish how to export all application data or migrate platform-specific state. Before committing, ask each vendor about data export formats, retention, and the steps required to move deployments, stored files, and managed database data.
Questions people ask
Is Vercel a good app deployment platform?
Vercel offers deployment environments, global delivery, serverless functions, sandboxed environments, and an API, CLI, MCP, and Skills for agents. Its free Hobby plan is for non-commercial projects; Pro costs $20 per month before usage beyond the included credit. Whether it fits depends on your workload and expected usage charges.
Which is better, Fly.io or Vercel?
Fly.io fits workloads that need hardware-virtualized Machines, isolated Sprites, or managed Postgres. Vercel fits teams looking for managed app deployment, global delivery, and agent tooling, with a free non-commercial Hobby plan. Compare the features and usage charges your application will actually consume rather than treating either platform as a universal winner.
Does Fly.io have a free tier?
Fly.io’s pricing lists no free plan. Its smallest listed Machine, shared-cpu-1x with 1 shared CPU and 256 MB RAM, costs $2.19 per month, with a listed rate of $0.0030 per hour. Storage, egress, and other resources can add charges.
Is there anything better than Vercel?
Fly.io is an alternative when you want to deploy on Machines, run isolated code sandboxes, or manage Postgres on the same platform. Vercel offers a free non-commercial plan and built-in agent and model features. The better fit depends on your deployment model, service needs, and how usage-based costs compare for your workload.