Fly.io Sprites vs Modal

Fly.io Sprites costs $0.0385 per vCPU-hour and Modal costs $0.070956 per vCPU-hour. Fly.io Sprites runs microVMs. Modal runs gVisor, offers GPUs and limits a session to 24 hours.

Updated Oct 14, 2026

Fly.io Sprites

Persistent Linux computers that sleep when idle.

Isolation: MicroVM
Free tier: $30 trial credit
Max session: Not listed

Visit site Fly.io Sprites profile

Modal

Serverless compute with sandboxes and GPUs.

Isolation: gVisor
Free tier: $30 credit every month
Max session: 24 hours

Visit site Modal profile

What is different

6 fields differ. The rest are the same or not listed.

Field

Fly.io Sprites

Modal

vCPU, per hour: Fly.io Sprites: $0.0385; Modal: $0.070956
RAM, per GiB-hour: Fly.io Sprites: $0.021875; Modal: $0.024012
Free tier: Fly.io Sprites: $30 trial credit; Modal: $30 credit every month
Billing: Fly.io Sprites: Active CPU time only; Modal: Per second
Isolation: Fly.io Sprites: MicroVM; Modal: gVisor
Integrations: Fly.io Sprites: MCP, OpenAI Agents SDK, Claude Code; Modal: Claude Agent SDK, Claude Code

Full comparison

18 fields, at each provider's list price

Fly.io Spritesfly.io/pricing

Modalmodal.com/pricing

Pricing

vCPU, per hour: Fly.io Sprites: $0.0385; Modal: $0.070956
RAM, per GiB-hour: Fly.io Sprites: $0.021875; Modal: $0.024012
Storage: Fly.io Sprites: $0.000683 per GiB-hour; Modal: Not listed
Free tier: Fly.io Sprites: $30 trial credit; Modal: $30 credit every month
Paid plan from: Fly.io Sprites: Pay as you go; Modal: Pay as you go
Billing: Fly.io Sprites: Active CPU time only; Modal: Per second

Limits

Max session: Fly.io Sprites: Not listed; Modal: 24 hours
Idle stop: Fly.io Sprites: Not listed; Modal: Not listed
Largest sandbox: Fly.io Sprites: Not listed; Modal: Not listed
Concurrent sandboxes: Fly.io Sprites: Not listed; Modal: Not listed

Platform

Isolation: Fly.io Sprites: MicroVM; Modal: gVisor
GPU: Fly.io Sprites: Not listed; Modal:
Snapshots: Fly.io Sprites:; Modal:
Pause and resume: Fly.io Sprites:; Modal: Not listed

Developer

SDKs: Fly.io Sprites: Python, JavaScript / TypeScript, Go; Modal: Python, JavaScript / TypeScript, Go
Integrations: Fly.io Sprites: MCP, OpenAI Agents SDK, Claude Code; Modal: Claude Agent SDK, Claude Code

Trust

License: Fly.io Sprites: Not listed; Modal: Not listed
BYOC: Fly.io Sprites: Not listed; Modal: Not listed

Hourly cost

One sandbox running for one hour

Size

Fly.io Sprites

Modal

1 vCPU · 2 GiB: Fly.io Sprites: $0.082; Modal: $0.119
2 vCPU · 4 GiB: Fly.io Sprites: $0.165; Modal: $0.238
4 vCPU · 8 GiB: Fly.io Sprites: $0.329; Modal: $0.476

Compute only, at list rates.

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Which one fits

Based on the fields above

Fly.io Sprites fits when

You want each sandbox in its own microVM.
You use MCP or the OpenAI Agents SDK.
You want the lower list price: $0.165 against $0.238 an hour for 2 vCPU and 4 GiB.
You need pause and resume.

Modal fits when

You need GPUs.
You use the Claude Agent SDK.
You need a desktop in the sandbox.
You need SOC 2 Type II, HIPAA and GDPR.

More comparisons

See all comparisons

Fly.io Sprites

Modal

What is different

Full comparison

Pricing

Limits

Platform

Developer

Trust

Hourly cost

Which one fits

Fly.io Sprites fits when

Modal fits when

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