Developer Tools · head to head
Bazel vs Semperis
Bazel
Developer Tools
Multi-language build system with fast, correct incremental builds
- From
- Free
- Free plan
- Yes
Semperis
Cybersecurity
Identity threat detection and Active Directory forest recovery for AD, Entra ID and Okta, from a privately held US vendor.
- From
- On request
- Free plan
- No
The short version
- Only Bazel has a free tier, so it costs nothing to try first.
- Each has a real cost: Bazel steep learning curve for developers unfamiliar with build systems; Semperis scope is limited to Active Directory, Entra ID and Okta, so an organisation whose critical identity lives elsewhere gets little from it, and the recovery value declines in direct proportion to how much has already moved off on-premises AD.
- They diverge on capability: Bazel covers Fast incremental builds, Semperis covers Active Directory Forest Recovery.
- Prices and features above were last checked on 30 August 2026.
Where they differ
Only the attributes on which Bazel and Semperis actually diverge.
Identical on both: user rating (Not yet rated).
What each one covers
Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.
Only in Bazel
- Fast incremental builds
- Multi-language support
- Distributed caching
- Parallel execution
- Dependency analysis
- Starlark extensibility
- Cross-platform support
Only in Semperis
- Active Directory Forest Recovery
- Malware-free restore
- Replication-stream monitoring
- Automated rollback
- Attack indicator scoring
- Entra ID and Okta coverage
- Purple Knight
- Forest Druid
What people use each for
The jobs each tool is most often brought in to do.
Bazel
- Building large monorepos with hundreds of interdependent projectsnot Semperis
- Multi-language projects requiring consistent build semanticsnot Semperis
- Organizations requiring reproducible builds and hermetic test executionnot Semperis
- Teams implementing distributed CI with shared build artifact cachingnot Semperis
Semperis
- An organisation that cannot answer an auditor or insurer asking how long it would take to rebuild Active Directory after a destructive attacknot Bazel
- Post-incident recovery where domain controllers are compromised and restoring from system-state backup would reintroduce the attacker's footholdnot Bazel
- Continuous detection of privileged group changes and directory-level tampering that domain controller security logs missnot Bazel
- Hybrid estates where AD, Entra ID and Okta all matter and no single tool currently shows changes across the threenot Bazel
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Bazel
- Steep learning curve for developers unfamiliar with build systems
- Initial setup complexity; requires BUILD files and Bazel configuration
- Verbose error messages can be difficult to debug for new users
- Smaller community and fewer third-party integrations vs enterprise tools
Semperis
- Scope is limited to Active Directory, Entra ID and Okta, so an organisation whose critical identity lives elsewhere gets little from it, and the recovery value declines in direct proportion to how much has already moved off on-premises AD.
- The licence buys tooling, not a proven runbook: forest recovery is only worth what your last rehearsal demonstrated, and a plan that has never been executed end to end in a lab is an untested assumption regardless of what was purchased.
- It overlaps with backup and directory management products from Quest, Veeam, Commvault and others, so the buyer must argue internally why a dedicated product is needed alongside a backup contract that already claims to protect Active Directory.
- Running Directory Services Protector well requires someone who understands AD internals, replication metadata and Tier 0 attack paths, and without that person the alerts on privileged changes are either ignored or auto-reverted in ways that break legitimate administration.
- Licensing is driven by identity object counts, so directories carrying years of stale user accounts and service principals pay for objects that should have been deleted, and the cleanup project that would reduce the bill is the one nobody has time for.
Pricing, plan by plan
Bazel
FreeNo published plan breakdown. See the Bazel review.
Semperis
On requestNo published plan breakdown. See the Semperis review.
Which should you pick?
Choose Bazel if
- You need fast incremental builds.
- You want to start without paying.
- You work on Windows, macOS, Linux.
- You also want multi-language support.
Choose Semperis if
- You need active directory forest recovery.
- You also want malware-free restore.
Questions people ask
- Is Bazel or Semperis better?
- Neither clearly leads. Bazel starts at Free and Semperis at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Bazel or Semperis?
- Bazel has a free tier; the other does not. Paid plans start at Free for Bazel and On request for Semperis.
- Does Bazel or Semperis run on more platforms?
- Bazel runs on Windows, macOS, Linux. Semperis runs on Web.
- Can I use Bazel for free?
- Yes. Bazel has a free tier, so you can try it without paying. Semperis starts at On request.
- What is Bazel best used for?
- Bazel is most often used for building large monorepos with hundreds of interdependent projects, multi-language projects requiring consistent build semantics, organizations requiring reproducible builds and hermetic test execution, teams implementing distributed ci with shared build artifact caching. Of those, building large monorepos with hundreds of interdependent projects and multi-language projects requiring consistent build semantics are not what Semperis is typically brought in for.
- What can Bazel do that Semperis cannot?
- Bazel covers Fast incremental builds, Multi-language support, Distributed caching, Parallel execution. Semperis covers Active Directory Forest Recovery, Malware-free restore, Replication-stream monitoring, Automated rollback.
Answered from the vendors’ own pages
Bazel: Does Bazel support distributed builds across CI infrastructure?
Yes, Bazel supports distributed execution and remote caching, allowing build work to be distributed across multiple machines and CI agents.
SourceSemperis: Does this replace my backups?
No. It replaces the Active Directory recovery procedure specifically. You still need backups for everything else, and the point of Semperis is that a generic system-state backup of a domain controller is a poor way to recover a forest because it restores the operating system along with whatever compromised it.
Bazel: What languages can be built with Bazel?
Bazel has built-in support for Java, C++, Go, Python, and Android/iOS development, with additional language support available through custom rules and community extensions.
SourceSemperis: Is it useful if we are cloud-only on Entra ID?
Partly. Directory Services Protector covers Entra ID and Okta for change tracking and posture, but the forest recovery product, which is the strongest reason to buy, applies to on-premises Active Directory. A genuinely cloud-only organisation should weigh it against Microsoft's own tooling.
Bazel: Can I use Bazel for small projects or is it only for large monorepos?
While Bazel excels at handling large projects, it can be used for smaller codebases. However, the setup overhead may not be justified for very small or simple projects.
SourceSemperis: Are Purple Knight and Forest Druid really free?
Yes, both are free downloads with no licence requirement, and they are widely used by organisations that are not Semperis customers. They are also, transparently, the top of the sales funnel.
Semperis: How long does forest recovery actually take?
The honest answer is whatever your rehearsal took. The vendor's case is hours instead of days, and automation genuinely removes most manual steps, but the number that matters for your board is the one from a test in your own environment.
Semperis: Does it require agents on domain controllers?
It collects directory changes from the AD replication stream, which is what lets it see changes that bypass the security log. Deployment details vary by product and version, so confirm the exact architecture against your domain controller change-control rules.
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