Railway Sandboxes vs Shardflux

Railway Sandboxes costs $0.069444 per vCPU-hour and Shardflux costs $0.04 per vCPU-hour. Railway Sandboxes runs full VMs. Shardflux runs Firecracker microVMs and offers GPUs.

Updated Oct 15, 2026

Railway Sandboxes

Isolated Linux VMs you create on demand and destroy.

Isolation: Full VM
Free tier: $5 trial credit for 30 days
Max session: Not listed

Visit site Railway Sandboxes 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

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

Field

Railway Sandboxes

Shardflux

vCPU, per hour: Railway Sandboxes: $0.069444; Shardflux: $0.04
RAM, per GiB-hour: Railway Sandboxes: $0.069444; Shardflux: $0.015
Free tier: Railway Sandboxes: $5 trial credit for 30 days; Shardflux: 30-day Pro trial, no card needed
Paid plan from: Railway Sandboxes: $5 / month; Shardflux: $9 / month
Largest sandbox: Railway Sandboxes: 32 vCPU · 32 GiB; Shardflux: 32 vCPU · 64 GiB
Concurrent sandboxes: Railway Sandboxes: Up to 100; Shardflux: Up to 200
Isolation: Railway Sandboxes: Full VM; Shardflux: Firecracker microVM
SDKs: Railway Sandboxes: TypeScript; Shardflux: TypeScript, Python
Integrations: Railway Sandboxes: Claude Code; Shardflux: Claude Code, MCP

Full comparison

18 fields, at each provider's list price

Railway Sandboxesrailway.com/pricingrailway.com

Shardfluxshardflux.dev/#pricingshardflux.dev

Pricing

vCPU, per hour: Railway Sandboxes: $0.069444; Shardflux: $0.04
RAM, per GiB-hour: Railway Sandboxes: $0.069444; Shardflux: $0.015
Storage: Railway Sandboxes: Not listed; Shardflux: Retained storage is a monthly allowance per plan. No hourly storage rate is published.
Free tier: Railway Sandboxes: $5 trial credit for 30 days; Shardflux: 30-day Pro trial, no card needed
Paid plan from: Railway Sandboxes: $5 / month; Shardflux: $9 / month
Billing: Railway Sandboxes: Active CPU time only; Shardflux: Active CPU time only

Limits

Max session: Railway Sandboxes: Not listed; Shardflux: Not listed
Idle stop: Railway Sandboxes: After 30 minutes; Shardflux: Not listed
Largest sandbox: Railway Sandboxes: 32 vCPU · 32 GiB; Shardflux: 32 vCPU · 64 GiB
Concurrent sandboxes: Railway Sandboxes: Up to 100; Shardflux: Up to 200

Platform

Isolation: Railway Sandboxes: Full VM; Shardflux: Firecracker microVM
GPU: Railway Sandboxes: Not listed; Shardflux:
Snapshots: Railway Sandboxes:; Shardflux:
Pause and resume: Railway Sandboxes: Not listed; Shardflux:

Developer

SDKs: Railway Sandboxes: TypeScript; Shardflux: TypeScript, Python
Integrations: Railway Sandboxes: Claude Code; Shardflux: Claude Code, MCP

Trust

License: Railway Sandboxes: Not listed; Shardflux: Not listed
BYOC: Railway Sandboxes: Not listed; Shardflux: Not listed

Hourly cost

One sandbox running for one hour

Size

Railway Sandboxes

Shardflux

1 vCPU · 2 GiB: Railway Sandboxes: $0.208; Shardflux: $0.070
2 vCPU · 4 GiB: Railway Sandboxes: $0.417; Shardflux: $0.140
4 vCPU · 8 GiB: Railway Sandboxes: $0.833; Shardflux: $0.280

Compute only, at list rates.

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Which one fits

Based on the fields above

Railway Sandboxes fits when

You want each sandbox to be a full VM.
You need SOC 2 Type II, HIPAA and GDPR.

Shardflux fits when

You need GPUs.
You want each sandbox in its own microVM.
You use MCP.
You want the lower list price: $0.140 against $0.417 an hour for 2 vCPU and 4 GiB.

More comparisons

See all comparisons

Railway Sandboxes

Shardflux

What is different

Full comparison

Pricing

Limits

Platform

Developer

Trust

Hourly cost

Which one fits

Railway Sandboxes fits when

Shardflux fits when

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