Phonebox vs Shardflux

Shardflux costs $0.04 per vCPU-hour. Phonebox limits a session to 3 hours. Shardflux runs Firecracker microVMs and offers GPUs.

Updated Oct 15, 2026

Phonebox

Cloud Android phones that AI agents control through their screens.

Isolation: Not listed
Free tier: $2 starter credit, one time, no card
Max session: 3 hours

Visit site Phonebox profile

Shardflux

Serverless VMs for cloud agents that park when idle and keep their state.

Isolation: Firecracker microVM
Free tier: 30-day Pro trial, no card needed
Max session: Not listed

Visit site Shardflux profile

What is different

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

Field

Phonebox

Shardflux

Free tier: Phonebox: $2 starter credit, one time, no card; Shardflux: 30-day Pro trial, no card needed
Paid plan from: Phonebox: Pay as you go; Shardflux: $9 / month
Billing: Phonebox: Bundled machine time; Shardflux: Active CPU time only
Concurrent sandboxes: Phonebox: Up to 5; Shardflux: Up to 200
SDKs: Phonebox: TypeScript; Shardflux: TypeScript, Python
Integrations: Phonebox: MCP; Shardflux: Claude Code, MCP

Full comparison

18 fields, at each provider's list price

Phoneboxphonebox.dev/pricingphonebox.dev

Shardfluxshardflux.dev/#pricingshardflux.dev

Pricing

vCPU, per hour: Phonebox: Not listed; Shardflux: $0.04
RAM, per GiB-hour: Phonebox: Not listed; Shardflux: $0.015
Storage: Phonebox: Not listed; Shardflux: Retained storage is a monthly allowance per plan. No hourly storage rate is published.
Free tier: Phonebox: $2 starter credit, one time, no card; Shardflux: 30-day Pro trial, no card needed
Paid plan from: Phonebox: Pay as you go; Shardflux: $9 / month
Billing: Phonebox: Bundled machine time; Shardflux: Active CPU time only

Limits

Max session: Phonebox: 3 hours; Shardflux: Not listed
Idle stop: Phonebox: After 5 minutes; Shardflux: Not listed
Largest sandbox: Phonebox: Not listed; Shardflux: 32 vCPU · 64 GiB
Concurrent sandboxes: Phonebox: Up to 5; Shardflux: Up to 200

Platform

Isolation: Phonebox: Not listed; Shardflux: Firecracker microVM
GPU: Phonebox: Not listed; Shardflux:
Snapshots: Phonebox: Not listed; Shardflux:
Pause and resume: Phonebox:; Shardflux:

Developer

SDKs: Phonebox: TypeScript; Shardflux: TypeScript, Python
Integrations: Phonebox: MCP; Shardflux: Claude Code, MCP

Trust

License: Phonebox: Not listed; Shardflux: Not listed
BYOC: Phonebox: Not listed; Shardflux: Not listed

Hourly cost

One sandbox running for one hour

Size

Phonebox

Shardflux

1 vCPU · 2 GiB: Phonebox: Not listed; Shardflux: $0.070
2 vCPU · 4 GiB: Phonebox: Not listed; Shardflux: $0.140
4 vCPU · 8 GiB: Phonebox: Not listed; Shardflux: $0.280

Compute only, at list rates.

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Which one fits

Based on the fields above

Phonebox fits when

You want to pay only for usage, with no plan fee.

Shardflux fits when

You need GPUs.
You use Claude Code.
You need snapshots.
You need a desktop in the sandbox.

More comparisons

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Phonebox

Shardflux

What is different

Full comparison

Pricing

Limits

Platform

Developer

Trust

Hourly cost

Which one fits

Phonebox fits when

Shardflux fits when

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