Fly.io Sprites vs Runtime

Fly.io Sprites costs $0.0385 per vCPU-hour and Runtime costs $0.025 per vCPU-hour. Fly.io Sprites runs Firecracker microVMs. Runtime runs Firecracker microVMs and has no session limit.

Updated Oct 23, 2026

Fly.io Sprites

Persistent Linux computers that sleep when idle.

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

Visit site Fly.io Sprites profile

Runtime

Firecracker microVM sandboxes for AI agents, billed on the CPU that code uses.

Isolation: Firecracker microVM
Free tier: 100 hours of a 1 GB machine in the first 30 days
Max session: No limit

Visit site Runtime profile

What is different

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

Field

Fly.io Sprites

Runtime

vCPU, per hour: Fly.io Sprites: $0.0385; Runtime: $0.025
RAM, per GiB-hour: Fly.io Sprites: $0.021875; Runtime: $0.0075
Storage: Fly.io Sprites: $0.000683 per GiB-hour; Runtime: $0.000119 per GiB-hour after 10 free GiB
Free tier: Fly.io Sprites: $30 trial credit; Runtime: 100 hours of a 1 GB machine in the first 30 days
SDKs: Fly.io Sprites: Python, JavaScript / TypeScript, Go; Runtime: JavaScript / TypeScript, Python, Go, Ruby, Java
Integrations: Fly.io Sprites: MCP, OpenAI Agents SDK, Claude Code; Runtime: OpenAI Agents SDK, Vercel AI SDK, Claude Agent SDK, LangChain, MCP, Claude Code

Full comparison

18 fields, at each provider's list price

Fly.io Spritesfly.io/pricing

Runtimewithruntime.com/pricingwithruntime.com

Pricing

vCPU, per hour: Fly.io Sprites: $0.0385; Runtime: $0.025
RAM, per GiB-hour: Fly.io Sprites: $0.021875; Runtime: $0.0075
Storage: Fly.io Sprites: $0.000683 per GiB-hour; Runtime: $0.000119 per GiB-hour after 10 free GiB
Free tier: Fly.io Sprites: $30 trial credit; Runtime: 100 hours of a 1 GB machine in the first 30 days
Paid plan from: Fly.io Sprites: Pay as you go; Runtime: Pay as you go
Billing: Fly.io Sprites: Active CPU time only; Runtime: Active CPU time only

Limits

Max session: Fly.io Sprites: Not listed; Runtime: No limit
Idle stop: Fly.io Sprites: Not listed; Runtime: After 5 minutes
Largest sandbox: Fly.io Sprites: Not listed; Runtime: 16 vCPU · 64 GiB
Concurrent sandboxes: Fly.io Sprites: Not listed; Runtime: Up to 200

Platform

Isolation: Fly.io Sprites: Firecracker microVM; Runtime: Firecracker microVM
GPU: Fly.io Sprites: Not listed; Runtime: No
Snapshots: Fly.io Sprites:; Runtime:
Pause and resume: Fly.io Sprites:; Runtime:

Developer

SDKs: Fly.io Sprites: Python, JavaScript / TypeScript, Go; Runtime: JavaScript / TypeScript, Python, Go, Ruby, Java
Integrations: Fly.io Sprites: MCP, OpenAI Agents SDK, Claude Code; Runtime: OpenAI Agents SDK, Vercel AI SDK, Claude Agent SDK, LangChain, MCP, Claude Code

Trust

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

Hourly cost

One sandbox running for one hour

Size

Fly.io Sprites

Runtime

1 vCPU · 2 GiB: Fly.io Sprites: $0.082; Runtime: $0.040
2 vCPU · 4 GiB: Fly.io Sprites: $0.165; Runtime: $0.080
4 vCPU · 8 GiB: Fly.io Sprites: $0.329; Runtime: $0.160

Compute only, at list rates.

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Which one fits

Based on the fields above

Fly.io Sprites fits when

You need SOC 2 Type II, HIPAA and GDPR.

Runtime fits when

You use the Vercel AI SDK, the Claude Agent SDK or LangChain.
You want the lower list price: $0.080 against $0.165 an hour for 2 vCPU and 4 GiB.
You need a desktop in the sandbox.

More comparisons

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Fly.io Sprites

Runtime

What is different

Full comparison

Pricing

Limits

Platform

Developer

Trust

Hourly cost

Which one fits

Fly.io Sprites fits when

Runtime fits when

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