Cloudflare Workers vs Fly.io
Cloudflare Workers and Fly.io both answer the same question: where does the app actually run? Code that runs in Cloudflare's edge network on a lightweight runtime, with storage primitives designed around it. Runs your containers as lightweight virtual machines in many regions, so the app itself can live near users. Fly.io covers more of the ecosystem, so it survives a change of framework; Cloudflare Workers is the better fit while you stay where it is strongest.
Verdict
Fly.io covers more of the ecosystem, so it survives a change of framework; Cloudflare Workers is the better fit while you stay where it is strongest.
Pick Cloudflare Workers if
- ✓Runs in hundreds of locations, so cold starts are effectively invisible.
- ✓R2 storage has no egress fees, which changes the maths for media-heavy apps.
- ✓Durable Objects give strongly consistent coordination without running a database.
Pick Fly.io if
- ✓Multi-region deployment of a normal app, not just of cached static files.
- ✓Machines can sleep and wake on request, keeping idle services cheap.
- ✓Private networking between regions makes distributed architectures achievable.
| Comparison | Cloudflare Workers | Fly.io |
|---|---|---|
| Pricing shape | Free tier with a daily request allowance, then low usage-based pricing per million requests and CPU time. | Usage-based per machine, priced by CPU, memory and running time, with volumes billed separately. |
| Frameworks | Next.js, SvelteKit, Nuxt | Next.js, SvelteKit, Nuxt, Laravel, Django, Rails |
| In one line | Code that runs in Cloudflare's edge network on a lightweight runtime, with storage primitives designed around it. | Runs your containers as lightweight virtual machines in many regions, so the app itself can live near users. |
Pricing described qualitatively because published plans change often. Checked 2026-08-23. Confirm current terms on Cloudflare Workers and Fly.io.
Cloudflare Workers
Strengths
- ✓Runs in hundreds of locations, so cold starts are effectively invisible.
- ✓R2 storage has no egress fees, which changes the maths for media-heavy apps.
- ✓Durable Objects give strongly consistent coordination without running a database.
- ✓Request pricing is among the cheapest available at high traffic.
Tradeoffs
- ✗Not full Node, so libraries touching filesystem or native modules break.
- ✗CPU time limits per request rule out heavy synchronous computation.
- ✗Storage primitives are proprietary, so building on them is a commitment.
- ✗Local development fidelity against the real runtime takes effort to trust.
Fly.io
Strengths
- ✓Multi-region deployment of a normal app, not just of cached static files.
- ✓Machines can sleep and wake on request, keeping idle services cheap.
- ✓Private networking between regions makes distributed architectures achievable.
- ✓Persistent volumes and full Linux processes mean almost nothing is off limits.
Tradeoffs
- ✗Closer to infrastructure, so you own more operational decisions than on a platform host.
- ✗Distributed regions force you to think about data locality and replication.
- ✗Configuration lives in files and CLI flags rather than a guided dashboard.
- ✗Platform reliability history has had rough patches that teams still weigh.
Frequently asked questions
Is Cloudflare Workers or Fly.io better?
Neither is better in the abstract. Fly.io covers more of the ecosystem, so it survives a change of framework; Cloudflare Workers is the better fit while you stay where it is strongest. Pick the one whose downside you can absorb, because both upsides are real.
What is the main drawback of Cloudflare Workers?
Not full Node, so libraries touching filesystem or native modules break. CPU time limits per request rule out heavy synchronous computation.
What is the main drawback of Fly.io?
Closer to infrastructure, so you own more operational decisions than on a platform host. Distributed regions force you to think about data locality and replication.
Can you switch from one to the other later?
Usually, at a cost that grows with how much of your product leans on the hosting layer. The sooner you wrap it in your own interface, the cheaper the exit stays.