DigitalOcean Harness Runtime vs Fly.io Sprites

DigitalOcean Harness Runtime costs $0.044 per vCPU-hour and Fly.io Sprites costs $0.0385 per vCPU-hour. DigitalOcean Harness Runtime runs Firecracker microVMs. Fly.io Sprites runs microVMs.

Updated Oct 14, 2026

DigitalOcean Harness Runtime

Managed microVM sandboxes for AI agents and their code.

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

Visit site DigitalOcean Harness Runtime profile

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

What is different

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

Field

DigitalOcean Harness Runtime

Fly.io Sprites

vCPU, per hour: DigitalOcean Harness Runtime: $0.044; Fly.io Sprites: $0.0385
RAM, per GiB-hour: DigitalOcean Harness Runtime: $0.0095; Fly.io Sprites: $0.021875
Storage: DigitalOcean Harness Runtime: Session volumes $0.05 per GiB-month; Fly.io Sprites: $0.000683 per GiB-hour
Isolation: DigitalOcean Harness Runtime: Firecracker microVM; Fly.io Sprites: MicroVM
SDKs: DigitalOcean Harness Runtime: Python; Fly.io Sprites: Python, JavaScript / TypeScript, Go

Full comparison

18 fields, at each provider's list price

DigitalOcean Harness Runtimedigitalocean.com/pricing/harness-runtimedigitalocean.com

Fly.io Spritesfly.io/pricing

Pricing

vCPU, per hour: DigitalOcean Harness Runtime: $0.044; Fly.io Sprites: $0.0385
RAM, per GiB-hour: DigitalOcean Harness Runtime: $0.0095; Fly.io Sprites: $0.021875
Storage: DigitalOcean Harness Runtime: Session volumes $0.05 per GiB-month; Fly.io Sprites: $0.000683 per GiB-hour
Free tier: DigitalOcean Harness Runtime: Not listed; Fly.io Sprites: $30 trial credit
Paid plan from: DigitalOcean Harness Runtime: Pay as you go; Fly.io Sprites: Pay as you go
Billing: DigitalOcean Harness Runtime: Active CPU time only; Fly.io Sprites: Active CPU time only

Limits

Max session: DigitalOcean Harness Runtime: Not listed; Fly.io Sprites: Not listed
Idle stop: DigitalOcean Harness Runtime: After 15 minutes; Fly.io Sprites: Not listed
Largest sandbox: DigitalOcean Harness Runtime: 16 vCPU · 32 GiB; Fly.io Sprites: Not listed
Concurrent sandboxes: DigitalOcean Harness Runtime: Up to 100; Fly.io Sprites: Not listed

Platform

Isolation: DigitalOcean Harness Runtime: Firecracker microVM; Fly.io Sprites: MicroVM
GPU: DigitalOcean Harness Runtime: Not listed; Fly.io Sprites: Not listed
Snapshots: DigitalOcean Harness Runtime:; Fly.io Sprites:
Pause and resume: DigitalOcean Harness Runtime:; Fly.io Sprites:

Developer

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

Trust

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

Hourly cost

One sandbox running for one hour

Size

DigitalOcean Harness Runtime

Fly.io Sprites

1 vCPU · 2 GiB: DigitalOcean Harness Runtime: $0.063; Fly.io Sprites: $0.082
2 vCPU · 4 GiB: DigitalOcean Harness Runtime: $0.126; Fly.io Sprites: $0.165
4 vCPU · 8 GiB: DigitalOcean Harness Runtime: $0.252; Fly.io Sprites: $0.329

Compute only, at list rates.

Open the calculator

Which one fits

Based on the fields above

DigitalOcean Harness Runtime fits when

You want the lower list price: $0.126 against $0.165 an hour for 2 vCPU and 4 GiB.

Fly.io Sprites fits when

You use MCP or the OpenAI Agents SDK.

More comparisons

See all comparisons

DigitalOcean Harness Runtime

Fly.io Sprites

What is different

Full comparison

Pricing

Limits

Platform

Developer

Trust

Hourly cost

Which one fits

DigitalOcean Harness Runtime fits when

Fly.io Sprites fits when

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