Shardflux vs Watasu

Shardflux costs $0.04 per vCPU-hour. Shardflux runs Firecracker microVMs and offers GPUs. Watasu limits a session to 24 hours.

Updated Oct 15, 2026

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

Watasu

Isolated Linux sandboxes for AI agents, hosted in the EU.

Isolation: Not listed
Free tier: Free Basic plan
Max session: 24 hours

Visit site Watasu profile

What is different

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

Field

Shardflux

Watasu

Storage: Shardflux: Retained storage is a monthly allowance per plan. No hourly storage rate is published.; Watasu: Retained disks €0.10 per GiB per month while the sandbox is stopped. Checkpoints and templates €0.03 per GiB per month.
Free tier: Shardflux: 30-day Pro trial, no card needed; Watasu: Free Basic plan
Billing: Shardflux: Active CPU time only; Watasu: Per second
Largest sandbox: Shardflux: 32 vCPU · 64 GiB; Watasu: 8 vCPU · 8 GiB
Concurrent sandboxes: Shardflux: Up to 200; Watasu: Up to 100

Full comparison

18 fields, at each provider's list price

Shardfluxshardflux.dev/#pricingshardflux.dev

Watasuwatasu.io/pricing

Pricing

vCPU, per hour: Shardflux: $0.04; Watasu: Not listed
RAM, per GiB-hour: Shardflux: $0.015; Watasu: Not listed
Storage: Shardflux: Retained storage is a monthly allowance per plan. No hourly storage rate is published.; Watasu: Retained disks €0.10 per GiB per month while the sandbox is stopped. Checkpoints and templates €0.03 per GiB per month.
Free tier: Shardflux: 30-day Pro trial, no card needed; Watasu: Free Basic plan
Paid plan from: Shardflux: $9 / month; Watasu: Not listed
Billing: Shardflux: Active CPU time only; Watasu: Per second

Limits

Max session: Shardflux: Not listed; Watasu: 24 hours
Idle stop: Shardflux: Not listed; Watasu: Not listed
Largest sandbox: Shardflux: 32 vCPU · 64 GiB; Watasu: 8 vCPU · 8 GiB
Concurrent sandboxes: Shardflux: Up to 200; Watasu: Up to 100

Platform

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

Developer

SDKs: Shardflux: TypeScript, Python; Watasu: Not listed
Integrations: Shardflux: Claude Code, MCP; Watasu: Not listed

Trust

License: Shardflux: Not listed; Watasu: Not listed
BYOC: Shardflux: Not listed; Watasu: Not listed

Hourly cost

One sandbox running for one hour

Size

Shardflux

Watasu

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

Compute only, at list rates.

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Which one fits

Based on the fields above

Shardflux fits when

You need GPUs.
You use Claude Code or MCP.
You need a desktop in the sandbox.
Your code waits a lot: CPU is billed only while it is in use.

More comparisons

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Shardflux

Watasu

What is different

Full comparison

Pricing

Limits

Platform

Developer

Trust

Hourly cost

Which one fits

Shardflux fits when

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