Fly.io Sprites

Name: Fly.io Sprites
Brand: Fly.io, Inc.

Persistent Firecracker microVMs for agents and dev environments that pause when idle, billed for CPU time and memory actually used plus storage.

Operated by Fly.io, Inc. fly.io/sprites Status: active[1] Checked 31 Oct 2026

Agent sandboxes

Sprites

Active-CPU billingOnly CPU in use is billed, so idle time costs less; the light-use column shows how much.

Sprites: plans
Plan	Price	Includes
Pay-as-you-go	Free[1]	Usage at standard rates; 10 Sprite creations a minute; community support
Adventurer	unknown[1]Price not on the current pages; the 2026-01-22 release notes listed 'Level 20 (Adventurer) - $20/mo'	60 Sprite creations a minute; community support
Veteran	unknown[1]Named in the Sprites FAQ; price not published	Community support
Hero	$100 /month[1]	1,200 CPU-hours, 4,800 RAM GB-hours, 150 GB storage; 100 running and 100 warm Sprites; standard email support
Champion	unknown[1]Named in the Sprites FAQ; price not published	Standard email support
Legend	unknown[1]Price not on the current pages; the 2026-01-22 release notes listed 'Level 200 (Legend) - $200/mo'	Standard email support
Epic	unknown[1]Named in the Sprites FAQ; price not published	Premium email support
Mythic	$2,000 /month[1]	28,000 RAM GB-hours; 240 Sprite creations a minute; premium email support

Sprites: prices per resource
Resource	Price	Per hour
per vCPU	$0.0385 /h[1]	$0.0385
per GB of memory	$0.0219 /h[1]	$0.0219

CPU is billed on cumulative CPU time (cpu.stat) and memory on actual memory used, both only while the Sprite is running; warm and cold (paused) Sprites are not billed for compute.
Storage is billed on bytes used, up to a 100 GB volume per Sprite. Cold storage is $0.000027/GB-hour (about $0.02/GB-month) for as long as data exists; hot storage adds $0.000683/GB-hour (about $0.50/GB-month) while the Sprite is awake.
Bandwidth is not metered for Sprites.
Each Sprite has 8 vCPUs; memory is assigned and scaled by the platform.
A warm wake keeps processes in memory (vendor claim 100-500 ms); a cold wake keeps only the filesystem (vendor claim 1-2 s).
Checkpoints snapshot the whole writable filesystem copy-on-write (vendor claim "about a second") and are taken automatically; restoring rewinds files in the same Sprite.
Plans bundle CPU-hours, RAM GB-hours and storage; usage above the allowance bills at the standard rates. Fly.io credits pay for usage, not the plan fee.
SSH works through `sprite proxy --ssh` as a ProxyCommand once you run an SSH server in the Sprite; `sprite console` is the built-in shell. Elixir SDK too; remote MCP server at sprites.dev/mcp.

Billing

Payment: Metered: usage billed afterwards[1]
Plan minimum: None[1]
Billing increment: unknown[1]Sprites page says resources are 'billed hourly, based on actual usage'; the docs overview says 'billed by the second'
Minimum charge: unknown[1]Not published
Per-job fee: None[1]

Runtime

Billed on: Active CPU[1]
Isolation: Firecracker microVM[1]
Max session: unknown[1]No maximum published; a Sprite runs while active and pauses about 30 seconds after activity stops (Tasks hold it active, 1 hour per task, renewable)
Concurrent sandboxes: unknown[1]Not published for pay-as-you-go; Hero allows 100 running and 100 warm Sprites, cold Sprites unlimited
Largest vCPU: 8[1]
Largest memory: unknown[1]Memory is managed and autoscaled by the platform; no fixed figure published

Lifecycle

Survives a stop: Disk[2]
Snapshots: Yes[2]
Pause and resume: Yes[2]
Fork: No[2]
Compute billed while stopped: No[2]
Auto-stop: unknown[2]Pauses about 30 seconds after activity stops; the field holds whole minutes
Start time (vendor claim): 2 s[2]

Capabilities

Storage and network

Disk included: None[4]
Extra disk: $0.02 per GB-month[4]
Snapshot storage: unknown[4]Checkpoint storage is not priced separately on the pricing pages
Egress: Free[4]

Platform

Free allowance

Raw data: JSON