Fly.io Sprites vs Mosaic Sandbox

Fly.io Sprites costs $0.0385 per vCPU-hour and Mosaic Sandbox costs $0.025 per vCPU-hour. Fly.io Sprites runs microVMs. Mosaic Sandbox runs Firecracker microVMs.

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

Mosaic Sandbox

Linux microVM sandboxes for coding agents.

Isolation: Firecracker microVM
Free tier: Not listed
Max session: Not listed

Visit site Mosaic Sandbox profile

What is different

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

Field

Fly.io Sprites

Mosaic Sandbox

vCPU, per hour: Fly.io Sprites: $0.0385; Mosaic Sandbox: $0.025
RAM, per GiB-hour: Fly.io Sprites: $0.021875; Mosaic Sandbox: Included
Storage: Fly.io Sprites: $0.000683 per GiB-hour; Mosaic Sandbox: Free
Billing: Fly.io Sprites: Active CPU time only; Mosaic Sandbox: Bundled machine time
Isolation: Fly.io Sprites: MicroVM; Mosaic Sandbox: Firecracker microVM
SDKs: Fly.io Sprites: Python, JavaScript / TypeScript, Go; Mosaic Sandbox: Python, TypeScript, Go
Integrations: Fly.io Sprites: MCP, OpenAI Agents SDK; Mosaic Sandbox: LangChain, MCP

Full comparison

18 fields, at each provider's list price

Fly.io Spritesfly.io/pricing

Mosaic Sandboxsandbox.mosaicos.com/pricingsandbox.mosaicos.com

Pricing

vCPU, per hour: Fly.io Sprites: $0.0385; Mosaic Sandbox: $0.025
RAM, per GiB-hour: Fly.io Sprites: $0.021875; Mosaic Sandbox: Included
Storage: Fly.io Sprites: $0.000683 per GiB-hour; Mosaic Sandbox: Free
Free tier: Fly.io Sprites: $30 trial credit; Mosaic Sandbox: Not listed
Paid plan from: Fly.io Sprites: Pay as you go; Mosaic Sandbox: Pay as you go
Billing: Fly.io Sprites: Active CPU time only; Mosaic Sandbox: Bundled machine time

Limits

Max session: Fly.io Sprites: Not listed; Mosaic Sandbox: Not listed
Idle stop: Fly.io Sprites: Not listed; Mosaic Sandbox: Not listed
Largest sandbox: Fly.io Sprites: Not listed; Mosaic Sandbox: 16 vCPU · 32 GiB
Concurrent sandboxes: Fly.io Sprites: Not listed; Mosaic Sandbox: Up to 200

Platform

Isolation: Fly.io Sprites: MicroVM; Mosaic Sandbox: Firecracker microVM
GPU: Fly.io Sprites: Not listed; Mosaic Sandbox: Not listed
Snapshots: Fly.io Sprites:; Mosaic Sandbox:
Pause and resume: Fly.io Sprites:; Mosaic Sandbox:

Developer

SDKs: Fly.io Sprites: Python, JavaScript / TypeScript, Go; Mosaic Sandbox: Python, TypeScript, Go
Integrations: Fly.io Sprites: MCP, OpenAI Agents SDK; Mosaic Sandbox: LangChain, MCP

Trust

License: Fly.io Sprites: Not listed; Mosaic Sandbox: Not listed
BYOC: Fly.io Sprites: Not listed; Mosaic Sandbox: Not listed

Hourly cost

One sandbox running for one hour

Size

Fly.io Sprites

Mosaic Sandbox

1 vCPU · 2 GiB: Fly.io Sprites: $0.082; Mosaic Sandbox: $0.025
2 vCPU · 4 GiB: Fly.io Sprites: $0.165; Mosaic Sandbox: $0.050
4 vCPU · 8 GiB: Fly.io Sprites: $0.329; Mosaic Sandbox: $0.100

Compute only, at list rates.

Open the calculator

Which one fits

Based on the fields above

Fly.io Sprites fits when

You use the OpenAI Agents SDK.
Your code waits a lot: CPU is billed only while it is in use.

Mosaic Sandbox fits when

You use LangChain.
You want the lower list price: $0.050 against $0.165 an hour for 2 vCPU and 4 GiB.

More comparisons

See all comparisons

Fly.io Sprites

Mosaic Sandbox

What is different

Full comparison

Pricing

Limits

Platform

Developer

Trust

Hourly cost

Which one fits

Fly.io Sprites fits when

Mosaic Sandbox fits when

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