Application platforms / Wasmer Edge alternative

A Wasmer Edge alternative for the agent’s Linux environment

Wasmer provides a WebAssembly runtime and Wasmer Edge application hosting. Edge apps can use persistent mounted volumes, remote S3-compatible access and managed application infrastructure. Its WASM/WASIX execution model and selected app volumes are distinct from a general-purpose Linux agent computer.

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Reviewed 2026-10-19 · Published by the Sandbox0 team

When Wasmer Edge fits

Wasmer Edge fits compatible web and network applications built for its runtime, global delivery and managed hosting. Its persistent volume and remote-file capabilities are real functionality to retain in a comparison.

When to consider Sandbox0

Choose Sandbox0 for compatible Linux agents that need installed native tools, system configuration and files across a complete durable writable RootFS, with automatic online growth and supported paused files. Check runtime compatibility when porting an app or agent.

Capabilities

Wasmer Edge and Sandbox0: what persists?

Feature comparison with documentation and verification status
Environment and runtime lifetimeWasmer EdgeNot established in this reviewSandbox0ttl 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 filesWasmer EdgeRegional mounted app volumes retain data and support enabled S3-compatible remote access, with configuration-sensitive deletion.View evidence ↗Sandbox0The writable RootFS survives successful checkpoints, including software, system configuration, dependencies, and user data.Read documentation →
Whole RootFSWasmer EdgePersistent selected app volumes and WASM workload isolation do not establish complete mutable Linux OS root retention.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 stateWasmer EdgeThe hosting product advertises rapid website pause/resume and on-demand execution; this is an app/runtime lifecycle.View evidence ↗Sandbox0Pause compute between tasks; resume on available capacity. Default resume starts fresh processes from the saved filesystem.Read documentation →
Memory and process stateWasmer EdgeThe reviewed Edge contract does not establish durable arbitrary Linux guest process/RAM checkpoint restoration.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.

Regional app-volume storage is separate from a complete mutable Linux RootFS. The reviewed Edge contract does not establish automatic online expansion of the whole agent OS filesystem.

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.

Wasmer already supports enabled S3-compatible volume access and a dashboard file explorer. Sandbox0’s comparison is supported access to the durable writable RootFS while guest compute remains paused, with filesystem-only mutations and retained-memory reads.

See paused file operations →

Persistent volumes have regional and concurrency constraints

Volumes mount at selected app paths and currently stay within one Edge region. The guide describes read-write-many access and warns that the current implementation is unsuitable for databases requiring a single writer. Renaming or removing a volume in app configuration deletes its data on deployment, so volume identity is part of the data lifecycle.

Source 1 ↗

Remote file access already includes S3-compatible clients

Once enabled, each volume has credentials for S3-compatible access; the dashboard file explorer and SFTP offer other paths. This is durable application-volume access, rather than evidence that every changed runtime OS path is retained. The guide documents daily volume backups with a 24-hour recovery point objective.

Source 1 ↗Source 2 ↗

Active CPU and provisioned memory are different meters

The Pro plan includes active CPU and provisioned-memory allowances, followed by distinct overage rates. The page advertises fast website pause/resume, while the architecture describes on-demand WASM workloads. Neither description establishes an arbitrary Linux guest RAM checkpoint contract for agent processes.

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.

Wasmer Edge

Pricing reviewed 2026-10-19

Hobby hosted plan
$0
Published limits and allowances apply.
Rate source ↗
Pro hosted plan
$10/month
Rate source ↗
Pro active CPU overage
$0.10 per active CPU-hour
6 active CPU-hours included.
Rate source ↗
Pro provisioned memory overage
$0.01 per GB-hour
400 GB-hours included.
Rate source ↗

The plan also has bandwidth, request, app, database, build and other limits. Storage overage labels show $0.05 per GB without an explicit period in the table, so confirm that meter before estimating a storage bill. Active CPU time and provisioned memory are distinct; hosted plan fees do not price the standalone runtime.

Check current Wasmer Edge 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 Wasmer Edge

  1. Inventory WASM/WASIX compatibility, application builds, named regional volumes, credentials and concurrent-writer requirements.
  2. Export volume data before renaming/removing mounts and port only compatible Linux agent execution and needed app behavior.
  3. Test app correctness separately from full-system retention, online growth, paused files and active-CPU/provisioned-memory costs.

Common questions

Is Sandbox0 a drop-in Wasmer Edge replacement?

Evaluate API compatibility and product scope. These products serve different core workflows, so a change may require a different architecture.

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.wasmer.io/edge/learn/volumes/ ↗docs.wasmer.io/edge/architecture/ ↗wasmer.io/pricing ↗Sandbox0 RootFS capacity →

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