ArcBox vs Mailosaur

See how their public offers line up before you choose your own position. Prices stay in the currency, billing schedule, and charged unit each vendor publishes.

ArcBox

See full pricing history

USD · US · source: arcbox.dev

Plan	Pricing	Charged by	Offer type
Free — Linux and Windows	Free Free $0 to start Try Linux and Windows machines with usage credits. No card required.	Usage · Usage-based on every OS	Standalone · Free
Pro — Linux and Windows Highlighted	Usage-based billed by the second For teams running agents in production on Linux and Windows. Usage-based billed by the second For teams running agents in production on Linux and Windows.	Usage · Usage-based billed by the second	Standalone · Usage based

Mailosaur

See full pricing history

USD · US · source: mailosaur.com

Plan	Pricing	Charged by	Offer type
personal — annual billing	USD 20 monthly · USD 20 / month with annual commitment From $ 20 per month , billed annually	Flat · per month , billed annually	Standalone · Starting at

What each plan includes

Feature names follow each vendor’s own pricing page, so verify the wording before treating them as exact equivalents.

ArcBox

Free — Linux and Windows

Highlights Concurrent environments: Up to 5

Included
Highlights Support: Community support

Included
Highlights Stopped Computers disk storage: Included

Pro — Linux and Windows

Highlights Concurrent environments: Higher concurrency and larger machines

Included
Highlights Team workspaces and API keys: Included
Highlights Snapshot storage and warm pools: Included
Highlights Priority email support: Included

Mailosaur

personal — annual billing

Highlights Users: Includes 1 user With support for up to 3 users

Included
Highlights Inboxes: 1 inbox (with unlimited email addresses)

Included
Highlights Unique domain name per inbox: Each inbox has a unique domain name

Included
Highlights Inbound emails: From 15,000 inbound emails/month

Included
Highlights Email compatibility testing: Included
Highlights API for test automation: Included
Highlights Forward individual emails to external addresses: Included

How their prices changed

Each dated row shows the public prices observed when that vendor’s pricing page changed.

ArcBox

August 27, 2026 Source
- Free — Linux and Windows: Free
- Pro — Linux and Windows: Usage-based billed by the second For teams running agents in production on Linux and Windows.

Mailosaur

August 27, 2026 Source
- personal — annual billing: USD 20 monthly · USD 20 / month with annual commitment