Agent sandboxes / Omnara alternative

Evaluating Omnara alternatives for a persistent agent computer

Omnara operates the agent control plane and can attach managed pool machines or your own computers. Sandbox0 supplies a persistent Linux runtime beneath an agent application. Decide which platform responsibilities you need before comparing the underlying machines.

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Reviewed 2026-10-18 · Published by the Sandbox0 team

When Omnara fits

Omnara fits teams that want managed agent orchestration, conversation and event history, machine grants, and a choice of execution providers or connected computers. Its default managed pool uses Blaxel and supports sleeping with retained process state.

When to consider Sandbox0

Consider Sandbox0 when your application owns the agent harness and needs a per-user durable RootFS, automatic online disk growth, and supported Files API access while compute stays paused. Recreate any orchestration and user-facing agent controls your product needs.

Capabilities

Omnara and Sandbox0: what persists?

Feature comparison with documentation and verification status
Environment and runtime lifetimeOmnaraMachine lifetime follows pool bindings and configured deletion policies; the reviewed guide does not establish one universal continuous-runtime limit.View evidence ↗Sandbox0ttl and hard_ttl default to 0 (disabled). Configure idle pause and deletion policies for the same persistent sandbox identity; an idle running sandbox still accrues compute charges.Read documentation →
Persistent filesOmnaraA pool machine retains its files and installed dependencies across turns and supported provider sleep, until machine deletion.View evidence ↗Sandbox0The writable RootFS survives successful checkpoints, including software, system configuration, dependencies, and user data.Read documentation →
Whole RootFSOmnaraThe machine retains dependencies and files; exact writable-disk scope and growth follow the chosen provider and image.View evidence ↗Sandbox0Persistence extends beyond /workspace to paths such as /usr/local, /etc, and /home. Runtime tmpfs and virtual filesystems are excluded.Read documentation →
Release compute, keep stateOmnaraSupported adapters sleep and resume; other adapters remain running.View evidence ↗Sandbox0Pause compute between tasks; resume on available capacity. Default resume starts fresh processes from the saved filesystem.Read documentation →
Memory and process stateOmnaraSupported sleeping providers retain memory and processes, including the default Blaxel pool; this is not universal across adapters.View evidence ↗Sandbox0Experimental memory checkpoints can preserve compatible process state. Use memory: true on both pause and resume on a compatible deployment. A filesystem checkpoint alone does not preserve running processes.Read documentation →

Online RootFS growth

On growth-enabled images, Sandbox0 automatically expands the writable RootFS as free space runs low, within a configured sparse logical ceiling up to 64 TiB. Agent processes keep running. Growth is enabled in the qualified Cloud region; confirm activation for other regions. Existing images and snapshots retain their captured storage geometry. The ceiling is logical capacity, not preallocated host disk.

Omnara pool configuration selects a provider and image or snapshot. The reviewed platform guides do not establish a uniform automatically growing RootFS across all adapters; evaluate the underlying machine’s storage contract.

Files while compute is paused

Sandbox0's Files API reads persistent files without resuming compute. Filesystem-only pauses also permit edits; retained-memory pauses are read-only and reject mutations with 409. SSH, SFTP, file watching, and runtime-only mounts require running compute.

See paused file operations →

Agent history and machine state have different lifetimes

A pool machine keeps files, dependencies, and supported running processes across turns and provider sleep. Archiving the agent, removing its pool source, explicit deletion, or idle-deletion policy can delete that machine. A replacement starts from the pool’s original image or snapshot; retained conversation events do not restore the deleted machine’s newer files.

Source 1 ↗Source 2 ↗

Sleep semantics follow the selected provider adapter

Omnara documents memory-preserving sleep for supported adapters, including its default Blaxel pool. Other adapters keep machines running rather than sleeping. These are Omnara integration behaviors, so confirm the selected adapter and configured sleep and deletion policies instead of applying one checkpoint promise to every provider.

Source 1 ↗

Retention is priced by machine memory, not stored file bytes

Omnara lists a free platform with managed runtime and retention charges, plus model tokens at provider rates. Its retention meter uses the machine’s GiB of memory for each retained 30-day period. Sandbox0 retained-storage pricing uses incremental stored data, so the two GiB-denominated rates measure different resources.

Source 1 ↗Source 2 ↗

Pricing

Compare billing models, then price your workload

CPU allocation, memory, billing minimums, disk, plan fees, and supported workload differ. These meters are not equal-performance machine quotes. Confirm region, resource units, and included allowances before estimating a total.

Omnara

Pricing reviewed 2026-10-18

Platform fee
$0
No per-seat platform fee; managed resources and model tokens are additional.
Rate source ↗
Managed machine runtime
$0.0414 per GiB of memory per hour online
Idle auto-sleep pauses runtime charges.
Rate source ↗
Managed machine retention
$0.20016 per GiB of memory per 30 days retained
Additional to runtime; this meter is memory capacity, not disk bytes.
Rate source ↗
Managed model tokens
At the model provider’s token rates
Rate source ↗

Bring-your-own model keys and machines are supported without a platform fee. Managed retention continues in addition to online runtime. Account for the selected provider, pool policy, model usage, and any enterprise deployment terms; Sandbox0 compute does not include an equivalent managed agent platform.

Check current Omnara pricing ↗

Sandbox0

$0.015/GiB-hour compute (billed by the second at approximately $0.000004167/GiB-second), plus $0.02/GiB-month of retained incremental RootFS and memory checkpoint data. Shared base images and platform recovery retention are excluded; paused sandboxes accrue storage charges only.

Compute / GiB-hour
$0.015
Retained data / GiB-month
$0.02
Paused compute
$0.00

A 4 GiB agent, 100 running hours

$6.00 compute

4 GiB × 100 hours, billed by the second. Keeping 20 GiB of billable incremental data for a full billing month adds $0.40. CPU is derived from memory by the platform; choose a tier that fits your workload.

Understand storage billing →

Before migrating from Omnara

  1. Inventory agents, pool bindings, image or snapshot IDs, tools, model settings, sleep policy, and idle-deletion rules.
  2. Export required machine files before archiving an agent or removing a pool, and retain conversation and event data separately.
  3. Choose the harness and model integration to run with Sandbox0, port machine tools and credentials, and validate RootFS growth, paused files, and required process restoration.

Common questions

Is Sandbox0 a drop-in Omnara replacement?

Evaluate API compatibility and product scope. A shared sandbox category does not make SDKs, lifecycle semantics, or limits interchangeable.

Does keeping files also keep a running agent?

Filesystem state and volatile process state are separate. Sandbox0 requires explicit compatible memory checkpoints to preserve running processes; its default filesystem resume starts fresh processes.

Sources and review scope

The Boat team's Battleships directory is the discovery source. References below describe the product and plan discussed on this page. Check current availability, regional terms and billing units before migrating. Where the cited material does not establish a capability or price, the comparison identifies that uncertainty.

Battleships research record ↗docs.omnara.com/machines/pools.md ↗docs.omnara.com/machines/overview ↗docs.omnara.com/machines/providers/overview.md ↗www.omnara.com/pricing ↗/pricing ↗Sandbox0 RootFS capacity →

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