Builder
$5.00 /mo
Billed monthly plus applicable taxes; fixed compute allowance
- Compute
- 250 compute-unit hours and 1,000 starts/month
Mainbrella
● Identity checkedAI agent sandboxes · Official vendor documentation reviewed 2026-10-07
Mainbrella provides API-managed Linux workspaces for AI agents to execute commands, transfer files and open web previews. Applications can select runtime images, inspect stdout and exit codes, or connect by SSH and a browser terminal. Fixed monthly plans cap compute and sessions, while saved-workspace features preserve selected filesystem state.
- Category
- AI agent sandboxes
- Free access
- No ongoing free tier or trial confirmed; Builder begins at $5 per month.
- API access
- HTTP API and JavaScript SDK for creation, commands, files, SSH and previews.
Is Mainbrella right for you?
A good fit for
Developers integrating command execution and temporary isolated filesystems into coding agents or tool-calling applications.
Before you choose
Workspaces are temporary: ordinary stop discards unsaved changes. Session deadlines, concurrency, compute allowance and saved-workspace retention vary by plan. Export important artifacts independently; model tokens are not included as an AI service.
Execute and retain the needed artifacts
Create a workspace with an available runtime image, upload required inputs and execute a bounded command through the API. Check stdout, stderr and exit status. Export results or explicitly save the workspace before stopping, then clean up the temporary container.
Fixed allowances and persistence tradeoffs
On 2026-10-07 the vendor lists Builder at $5 monthly, Pro at $180 and Scale at $999, plus taxes. Larger machine sizes consume additional compute units, and hard caps stop usage rather than automatically billing overages. A stopped unsaved container loses changes; saved workspaces have plan-specific quota and retention limits.
What it can do
Features & capabilities
Unknown is different from unavailable. Each fact carries its own evidence.
| Capability | Value | Evidence | Checked |
|---|---|---|---|
| Builder allowance | 250 compute-unit hours and 1,000 starts per month. | Facts sourced | 2026-10-07 |
| Builder concurrency | Up to five containers within 28 concurrent compute units. | Facts sourced | 2026-10-07 |
| Builder sessions | Up to one-hour sessions with a ten-minute idle timeout. | Facts sourced | 2026-10-07 |
| Billing | Builder $5/month, Pro $180/month and Scale $999/month plus applicable tax; no automatic overage or paid top-ups. | Facts sourced | 2026-10-07 |
Understand the total cost
Mainbrella pricing & plans
Pro
$180.00 /mo
Billed monthly plus applicable taxes
Scale
$999.00 /mo
Billed monthly plus applicable taxes
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Explore toolThe practical questions
Frequently asked questions
Are files retained when a machine stops?
The official page says ordinary stop discards unsaved changes. Save the workspace before stopping and keep separate exports for important outputs.
Can extra usage trigger an automatic compute charge?
The vendor says fixed allowances and runtime deadlines cap usage, with no automatic compute overage charges or paid top-ups enabled.
What is Mainbrella used for?
Mainbrella provides API-managed Linux workspaces for AI agents to execute commands, transfer files and open web previews. Applications can select runtime images, inspect stdout and exit codes, or connect by SSH and a browser terminal. Fixed monthly plans cap compute and sessions, while saved-workspace features preserve selected filesystem state.
Does Mainbrella have a free plan?
No ongoing free tier or trial confirmed; Builder begins at $5 per month.. This record does not confirm an ongoing free plan.
How much does Mainbrella cost?
The listed monthly price is $5.00 USD at monthly billing. See the plan cards for entitlements, billing commitments and seat minimums.
Can I use Mainbrella through an API?
HTTP API and JavaScript SDK for creation, commands, files, SSH and previews.. API access and subscription access may have different terms; consult the linked sources.
What should I check before choosing it?
Workspaces are temporary: ordinary stop discards unsaved changes. Session deadlines, concurrency, compute allowance and saved-workspace retention vary by plan. Export important artifacts independently; model tokens are not included as an AI service.
Price history
No retained pricing changes yet. A current price alone does not establish a historical trend.
How this profile is supported
Official product documentation
Vendor website reviewed for current workflow and limitations; no application test performed.
Read original source ↗Facts apply to the named version and check date. Send a sourced correction if something changed.