Fly.io Sprites vs Unikraft Cloud

Fly.io Sprites costs $0.0385 per vCPU-hour. Fly.io Sprites runs microVMs. Unikraft Cloud 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

Unikraft Cloud

MicroVM sandboxes that start in under 10 ms.

Isolation: Firecracker microVM
Free tier: Hobby plan, free forever
Max session: Not listed

Visit site Unikraft Cloud profile

What is different

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

Field

Fly.io Sprites

Unikraft Cloud

Free tier: Fly.io Sprites: $30 trial credit; Unikraft Cloud: Hobby plan, free forever
Paid plan from: Fly.io Sprites: Pay as you go; Unikraft Cloud: $39 / month
Isolation: Fly.io Sprites: MicroVM; Unikraft Cloud: Firecracker microVM

Full comparison

18 fields, at each provider's list price

Fly.io Spritesfly.io/pricing

Unikraft Cloudunikraft.com/pricingunikraft.com

Pricing

vCPU, per hour: Fly.io Sprites: $0.0385; Unikraft Cloud: Not listed
RAM, per GiB-hour: Fly.io Sprites: $0.021875; Unikraft Cloud: Not listed
Storage: Fly.io Sprites: $0.000683 per GiB-hour; Unikraft Cloud: Not listed
Free tier: Fly.io Sprites: $30 trial credit; Unikraft Cloud: Hobby plan, free forever
Paid plan from: Fly.io Sprites: Pay as you go; Unikraft Cloud: $39 / month
Billing: Fly.io Sprites: Active CPU time only; Unikraft Cloud: Not listed

Limits

Max session: Fly.io Sprites: Not listed; Unikraft Cloud: Not listed
Idle stop: Fly.io Sprites: Not listed; Unikraft Cloud: Not listed
Largest sandbox: Fly.io Sprites: Not listed; Unikraft Cloud: Not listed
Concurrent sandboxes: Fly.io Sprites: Not listed; Unikraft Cloud: Up to 24

Platform

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

Developer

SDKs: Fly.io Sprites: Python, JavaScript / TypeScript, Go; Unikraft Cloud: Python, JavaScript / TypeScript, Go
Integrations: Fly.io Sprites: MCP, OpenAI Agents SDK; Unikraft Cloud: Not listed

Trust

License: Fly.io Sprites: Not listed; Unikraft Cloud: Not listed
BYOC: Fly.io Sprites: Not listed; Unikraft Cloud: Enterprise plan

Hourly cost

One sandbox running for one hour

Size

Fly.io Sprites

Unikraft Cloud

1 vCPU · 2 GiB: Fly.io Sprites: $0.082; Unikraft Cloud: Not listed
2 vCPU · 4 GiB: Fly.io Sprites: $0.165; Unikraft Cloud: Not listed
4 vCPU · 8 GiB: Fly.io Sprites: $0.329; Unikraft Cloud: Not listed

Compute only, at list rates.

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Which one fits

Based on the fields above

Fly.io Sprites fits when

You want to pay only for usage, with no plan fee.
You use MCP or the OpenAI Agents SDK.
Your code waits a lot: CPU is billed only while it is in use.

Unikraft Cloud fits when

You need the sandboxes in your own cloud account.
You need SOC 2 Type II, HIPAA and GDPR.

More comparisons

See all comparisons

Fly.io Sprites

Unikraft Cloud

What is different

Full comparison

Pricing

Limits

Platform

Developer

Trust

Hourly cost

Which one fits

Fly.io Sprites fits when

Unikraft Cloud fits when

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