Phonebox vs Runtime

Runtime costs $0.025 per vCPU-hour. Phonebox limits a session to 3 hours. Runtime runs Firecracker microVMs and has no session limit.

Updated Oct 23, 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

Runtime

Firecracker microVM sandboxes for AI agents, billed on the CPU that code uses.

Isolation: Firecracker microVM
Free tier: 100 hours of a 1 GB machine in the first 30 days
Max session: No limit

Visit site Runtime profile

What is different

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

Field

Phonebox

Runtime

Free tier: Phonebox: $2 starter credit, one time, no card; Runtime: 100 hours of a 1 GB machine in the first 30 days
Billing: Phonebox: Bundled machine time; Runtime: Active CPU time only
Max session: Phonebox: 3 hours; Runtime: No limit
Concurrent sandboxes: Phonebox: Up to 5; Runtime: Up to 200
SDKs: Phonebox: TypeScript; Runtime: JavaScript / TypeScript, Python, Go, Ruby, Java
Integrations: Phonebox: MCP; Runtime: OpenAI Agents SDK, Vercel AI SDK, Claude Agent SDK, LangChain, MCP, Claude Code

Full comparison

18 fields, at each provider's list price

Phoneboxphonebox.dev/pricingphonebox.dev

Runtimewithruntime.com/pricingwithruntime.com

Pricing

vCPU, per hour: Phonebox: Not listed; Runtime: $0.025
RAM, per GiB-hour: Phonebox: Not listed; Runtime: $0.0075
Storage: Phonebox: Not listed; Runtime: $0.000119 per GiB-hour after 10 free GiB
Free tier: Phonebox: $2 starter credit, one time, no card; Runtime: 100 hours of a 1 GB machine in the first 30 days
Paid plan from: Phonebox: Pay as you go; Runtime: Pay as you go
Billing: Phonebox: Bundled machine time; Runtime: Active CPU time only

Limits

Max session: Phonebox: 3 hours; Runtime: No limit
Idle stop: Phonebox: After 5 minutes; Runtime: After 5 minutes
Largest sandbox: Phonebox: Not listed; Runtime: 16 vCPU · 64 GiB
Concurrent sandboxes: Phonebox: Up to 5; Runtime: Up to 200

Platform

Isolation: Phonebox: Not listed; Runtime: Firecracker microVM
GPU: Phonebox: Not listed; Runtime: No
Snapshots: Phonebox: Not listed; Runtime:
Pause and resume: Phonebox:; Runtime:

Developer

SDKs: Phonebox: TypeScript; Runtime: JavaScript / TypeScript, Python, Go, Ruby, Java
Integrations: Phonebox: MCP; Runtime: OpenAI Agents SDK, Vercel AI SDK, Claude Agent SDK, LangChain, MCP, Claude Code

Trust

License: Phonebox: Not listed; Runtime: Not listed
BYOC: Phonebox: Not listed; Runtime: Not listed

Hourly cost

One sandbox running for one hour

Size

Phonebox

Runtime

1 vCPU · 2 GiB: Phonebox: Not listed; Runtime: $0.040
2 vCPU · 4 GiB: Phonebox: Not listed; Runtime: $0.080
4 vCPU · 8 GiB: Phonebox: Not listed; Runtime: $0.160

Compute only, at list rates.

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Which one fits

Based on the fields above

Runtime fits when

A session must run longer than 3 hours.
You use the OpenAI Agents SDK, the Vercel AI SDK, the Claude Agent SDK, LangChain or Claude Code.
You need snapshots.
You need a desktop in the sandbox.

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Phonebox

Runtime

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Trust

Hourly cost

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