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Developer Tools · head to head

Bazel vs Ory Kratos

Bazel logo

Bazel

Developer Tools

Multi-language build system with fast, correct incremental builds

From
Free
Rated
-
Full reviewWebsite
Ory Kratos logo

Ory Kratos

Cybersecurity

Headless identity and user management API

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Bazel steep learning curve for developers unfamiliar with build systems; Ory Kratos headless means you build every screen, which is significant work compared with a hosted login page
  • They diverge on capability: Bazel covers Fast incremental builds, Ory Kratos covers Headless API.

Where they differ

Only the attributes on which Bazel and Ory Kratos actually diverge.

Attributes where Bazel and Ory Kratos differ
AttributeBazelOry Kratos
Pricing modelopen-sourceOpen-source self-hosted, with a paid managed network
PlatformsWindows, macOS, LinuxLinux, Docker, Kubernetes, Self-hosted
CategoryDeveloper ToolsCybersecurity

Identical on both: starting price (Free), free tier (Yes), 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 Ory Kratos

  • Headless API
  • Self-service flows
  • Multi-factor authentication
  • Pluggable identity schemas

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 Ory Kratos
  • Multi-language projects requiring consistent build semanticsnot Ory Kratos
  • Organizations requiring reproducible builds and hermetic test executionnot Ory Kratos
  • Teams implementing distributed CI with shared build artifact cachingnot Ory Kratos

Ory Kratos

  • Products needing complete control over the look and flow of authenticationnot Bazel
  • Applications that must not hand user identity data to a third partynot Bazel
  • Teams building identity as infrastructure across several servicesnot 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

Ory Kratos

  • Headless means you build every screen, which is significant work compared with a hosted login page
  • More moving parts than a monolithic IAM: Kratos handles identity, and OAuth2 needs Ory Hydra alongside
  • Documentation assumes real familiarity with identity concepts and is not a gentle introduction
  • Self-hosting identity carries the security and availability burden that hosted providers absorb

Pricing, plan by plan

Bazel

Free

No published plan breakdown. See the Bazel review.

Ory Kratos

Free
  • Self-hostedFree
    • Full identity server
    • All flows
    • Community support

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.
Bazel review

Choose Ory Kratos if

  • You need headless api.
  • You want to start without paying.
  • You work on Linux, Docker, Kubernetes, Self-hosted.
  • You also want self-service flows.
Ory Kratos review

Questions people ask

Is Bazel or Ory Kratos better?
Neither clearly leads. Bazel starts at Free and Ory Kratos at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Bazel or Ory Kratos?
Bazel starts at Free and Ory Kratos at Free.
Does Bazel or Ory Kratos run on more platforms?
Bazel runs on Windows, macOS, Linux. Ory Kratos runs on Linux, Docker, Kubernetes, Self-hosted.
Can I use Bazel for free?
Both have a free tier, so you can try either at no cost before committing.
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 Ory Kratos is typically brought in for.
What can Bazel do that Ory Kratos cannot?
Bazel covers Fast incremental builds, Multi-language support, Distributed caching, Parallel execution. Ory Kratos covers Headless API, Self-service flows, Multi-factor authentication, Pluggable identity schemas.

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.

Source
Ory Kratos: Is Ory Kratos free?

Yes, open source and free to self-host. Ory Network is a paid managed service.

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.

Source
Ory Kratos: What does headless mean here?

Kratos provides identity flows as APIs and no user interface. You build the login, registration and recovery screens yourself.

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.

Source
Ory Kratos: Does Kratos do OAuth2?

No. Kratos handles user identity; OAuth2 and OpenID Connect provider functionality is Ory Hydra, a separate component.

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