Fly.io Sprites vs Phonebox
Fly.io Sprites costs $0.0385 per vCPU-hour. Fly.io Sprites runs Firecracker microVMs. Phonebox limits a session to 3 hours.
Updated
Fly.io Sprites
- Isolation
- Firecracker microVM
- Free tier
- $30 trial credit
- Max session
- Not listed
Phonebox
- Isolation
- Not listed
- Free tier
- $2 starter credit, one time, no card
- Max session
- 3 hours
What is different
4 fields differ. The rest are the same or not listed.
Fly.io Sprites
Phonebox
- Free tier
- Fly.io Sprites: $30 trial credit
- Phonebox: $2 starter credit, one time, no card
- Billing
- Fly.io Sprites: Active CPU time only
- Phonebox: Bundled machine time
- SDKs
- Fly.io Sprites: Python, JavaScript / TypeScript, Go
- Phonebox: TypeScript
- Integrations
- Fly.io Sprites: MCP, OpenAI Agents SDK, Claude Code
- Phonebox: MCP
Full comparison
18 fields, at each provider's list price
Fly.io Spritesfly
Phoneboxphonebox
Pricing
- vCPU, per hour
- Fly.io Sprites: $0.0385
- Phonebox: Not listed
- RAM, per GiB-hour
- Fly.io Sprites: $0.021875
- Phonebox: Not listed
- Storage
- Fly.io Sprites: $0.000683 per GiB-hour
- Phonebox: Not listed
- Free tier
- Fly.io Sprites: $30 trial credit
- Phonebox: $2 starter credit, one time, no card
- Paid plan from
- Fly.io Sprites: Pay as you go
- Phonebox: Pay as you go
- Billing
- Fly.io Sprites: Active CPU time only
- Phonebox: Bundled machine time
Limits
- Max session
- Fly.io Sprites: Not listed
- Phonebox: 3 hours
- Idle stop
- Fly.io Sprites: Not listed
- Phonebox: After 5 minutes
- Largest sandbox
- Fly.io Sprites: Not listed
- Phonebox: Not listed
- Concurrent sandboxes
- Fly.io Sprites: Not listed
- Phonebox: Up to 5
Platform
- Isolation
- Fly.io Sprites: Firecracker microVM
- Phonebox: Not listed
- GPU
- Fly.io Sprites: Not listed
- Phonebox: Not listed
- Snapshots
- Fly.io Sprites:
- Phonebox: Not listed
- Pause and resume
- Fly.io Sprites:
- Phonebox:
Developer
- SDKs
- Fly.io Sprites: Python, JavaScript / TypeScript, Go
- Phonebox: TypeScript
- Integrations
- Fly.io Sprites: MCP, OpenAI Agents SDK, Claude Code
- Phonebox: MCP
Trust
- License
- Fly.io Sprites: Not listed
- Phonebox: Not listed
- BYOC
- Fly.io Sprites: Not listed
- Phonebox: Not listed
Hourly cost
One sandbox running for one hour
Fly.io Sprites
Phonebox
- 1 vCPU · 2 GiB
- Fly.io Sprites: $0.082
- Phonebox: Not listed
- 2 vCPU · 4 GiB
- Fly.io Sprites: $0.165
- Phonebox: Not listed
- 4 vCPU · 8 GiB
- Fly.io Sprites: $0.329
- Phonebox: Not listed
Compute only, at list rates.
Open the calculatorWhich one fits
Based on the fields above
Fly.io Sprites fits when
- You use the OpenAI Agents SDK or Claude Code.
- You want the larger free credit: $30 against $2.
- You need snapshots.
- Your code waits a lot: CPU is billed only while it is in use.
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