CI and test infrastructure / AWS CodeBuild alternative

AWS CodeBuild alternative

CodeBuild runs builds and tests, with on-demand or reserved compute and a debug sandbox for custom commands and SSH troubleshooting. Those modes have different billing clocks and capacity commitments. A returning agent’s durable machine lifecycle is a separate requirement from CI artifacts or an image-layer cache.

Start buildingCompare capabilities ↓

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

When AWS CodeBuild fits

CodeBuild fits teams needing AWS-integrated build projects, buildspec execution, artifacts, IAM and managed CI capacity. Retain that workflow integration where needed; using a Linux runtime does not automatically recreate a CodeBuild project or pipeline.

When to consider Sandbox0

Consider Sandbox0 when the agent’s complete writable environment should persist across tasks and grow online, with supported files available while compute is paused. You supply CI/job scheduling, AWS artifact/IAM adapters and any required build isolation integration.

Capabilities

AWS CodeBuild and Sandbox0: what persists?

Feature comparison with documentation and verification status
Environment and runtime lifetimeAWS CodeBuildThe general maximum build timeout is 2,160 minutes, with compute-mode-specific constraints; not an always-on VM offer.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 filesAWS CodeBuildArtifacts/caches are separate; durable debug-machine disk recovery after termination is not established.View evidence ↗Sandbox0The writable RootFS survives successful checkpoints, including software, system configuration, dependencies, and user data.Read documentation →
Whole RootFSAWS CodeBuildAn interactive debug build does not establish saved whole writable RootFS lifecycle.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 stateAWS CodeBuildStart/stop of a debug sandbox is not a documented arbitrary-process checkpoint interface.View evidence ↗Sandbox0Pause compute between tasks; resume on available capacity. Default resume starts fresh processes from the saved filesystem.Read documentation →
Memory and process stateAWS CodeBuildNo general process-memory snapshot/restore contract is established.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.

CodeBuild caches, artifacts and debug access are useful build features. The reviewed sources do not establish automatic growth of a complete durable RootFS retained as the same returning agent environment. Reserved machine capacity and persistent application state are different contracts.

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.

The debug guide’s command and SSH actions use running compute. Reading stored build logs or S3 artifacts is not supported file access to a complete paused guest RootFS; that broader interface is not established here.

See paused file operations →

The billing clock depends on the compute mode

EC2 on-demand builds round usage up to minutes; Lambda build usage is measured in seconds. Reserved EC2 capacity has a 60-minute minimum and Mac reservations a 24-hour minimum. Debug Sandbox usage runs from start to termination and rounds to seconds; the normal CodeBuild free tier does not cover Sandbox or reserved capacity.

Source 1 ↗

Debug Sandbox is a build troubleshooting surface

The official guide describes running custom commands and connecting through SSH to debug a project, then stopping the sandbox when troubleshooting ends. That is a useful interactive environment; the guide does not establish a returning whole-RootFS snapshot/recovery contract after termination.

Source 1 ↗

Stored build assets and a complete machine are different resources

Build artifacts, external storage, logs and image-layer cache can survive a job under their own policies. Image-server cache-at-rest remains billable until disabled. The quotas page lists a maximum build timeout of 2,160 minutes; do not apply that figure indiscriminately to every compute mode or infer indefinite machine retention.

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.

AWS CodeBuild

Pricing reviewed 2026-10-18

Published EC2 example
$0.005 per build minute
The official example uses build.general1.small; confirm current target region and compute class.
Rate source ↗
Published Lambda example
$0.00001 per build second
The official example uses lambda.arm.1GB; different hardware/mode from EC2.
Rate source ↗
Reserved EC2 minimum
60 minutes per instance
Capacity metering continues until instance termination; Mac has a separate 24-hour minimum.
Rate source ↗
Debug Sandbox
Per second from start to termination
No CodeBuild AWS Free Tier allowance; obtain the selected region/resource quote.
Rate source ↗

Numerical amounts above are explicitly AWS’s worked-example rates, not a universal live regional quote. Current compute type, region and purchase mode matter. Free-tier build allowances cannot be moved into Sandbox usage. Logs, S3, data transfer, image-server/cache and other AWS services can be additional charges. No equal-hardware or universal savings conclusion is drawn from these examples.

Check current AWS CodeBuild 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 AWS CodeBuild

  1. Inventory buildspecs, project/resource modes, AWS roles, caches/artifacts, timeout settings and regional price assumptions.
  2. Retain or choose a CI control plane and integrate Sandbox0 explicitly for compatible returning-agent execution.
  3. Test repeated builds/tasks, retained system tools, growth, paused files, permissions and all compute/storage/AWS charges.

Common questions

Is Sandbox0 a drop-in AWS CodeBuild 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 ↗aws.amazon.com/codebuild/pricing/ ↗docs.aws.amazon.com/codebuild/latest/userguide/sandbox.html ↗docs.aws.amazon.com/codebuild/latest/userguide/limits.html ↗Sandbox0 RootFS capacity →

Related comparisons

Apple Xcode Cloud vs Sandbox0 →Artillery vs Sandbox0 →Azure Pipelines vs Sandbox0 →Bitbucket Pipelines vs Sandbox0 →Blacksmith (GitHub Actions runners) vs Sandbox0 →Buildkite hosted agents vs Sandbox0 →