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Developer Tools · head to head

Bazel vs Flowable

Bazel logo

Bazel

Developer Tools

Multi-language build system with fast, correct incremental builds

From
Free
Rated
-
Full reviewWebsite
Flowable logo

Flowable

Automation Integration

Apache 2.0 BPMN, CMMN and DMN engine from the team that originally built Activiti

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Bazel steep learning curve for developers unfamiliar with build systems; Flowable the open source engine is genuinely usable but ships without the modelling studio, work application and admin console, so an open source deployment means building your own user interfaces before anyone can use it.
  • They diverge on capability: Bazel covers Fast incremental builds, Flowable covers BPMN 2.0 engine.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Bazel and Flowable actually diverge.

Attributes where Bazel and Flowable differ
AttributeBazelFlowable
Pricing modelopen-sourcequote
PlatformsWindows, macOS, LinuxLinux, Windows, Docker, Kubernetes, Cloud
CategoryDeveloper ToolsAutomation Integration

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 Flowable

  • BPMN 2.0 engine
  • CMMN case management
  • DMN decision tables
  • Spring Boot integration
  • Modelling studio
  • Task and case application
  • REST APIs
  • History and audit

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

Flowable

  • An insurer automating claims handling where each case follows a different path and BPMN alone cannot express itnot Bazel
  • A bank embedding process orchestration inside an existing Spring Boot estate rather than buying a separate platformnot Bazel
  • A team leaving Activiti or jBPM that wants the same API family with active commercial maintenancenot Bazel
  • A regulated organisation needing complete process history and decision table audit trails for supervisorsnot 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

Flowable

  • The open source engine is genuinely usable but ships without the modelling studio, work application and admin console, so an open source deployment means building your own user interfaces before anyone can use it.
  • It expects Java engineering capacity; teams looking for a business-user low-code automation tool will find the modelling and deployment cycle far too technical.
  • Enterprise pricing is not published and is quoted per deployment, leaving buyers without a benchmark against Camunda or IBM alternatives.
  • The Activiti fork left three engines with related APIs and overlapping documentation in circulation, and search results routinely return advice for the wrong one.
  • Flowable AG is a small Swiss company relative to its competitors, so the partner network, training market and pool of engineers with production experience are all limited outside Europe.

Pricing, plan by plan

Bazel

Free

No published plan breakdown. See the Bazel review.

Flowable

Free
  • Flowable Open SourceFree
    • Apache 2.0 licensed BPMN, CMMN and DMN engines
    • Embeddable Java library or standalone apps
    • No modelling studio or enterprise applications
  • Flowable Enterprise$undefined/year
    • Modelling studio, work application and admin console
    • Connectors, forms and advanced identity management
    • Support with SLA and version maintenance

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 Flowable if

  • You need bpmn 2.0 engine.
  • You want to start without paying.
  • You work on Linux, Windows, Docker, Kubernetes, Cloud.
  • You also want cmmn case management.
Flowable review

Questions people ask

Is Bazel or Flowable better?
Neither clearly leads. Bazel starts at Free and Flowable at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Bazel or Flowable?
Bazel starts at Free and Flowable at Free.
Does Bazel or Flowable run on more platforms?
Bazel runs on Windows, macOS, Linux. Flowable runs on Linux, Windows, Docker, Kubernetes, Cloud.
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 Flowable is typically brought in for.
What can Bazel do that Flowable cannot?
Bazel covers Fast incremental builds, Multi-language support, Distributed caching, Parallel execution. Flowable covers BPMN 2.0 engine, CMMN case management, DMN decision tables, Spring Boot integration.

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
Flowable: Is Flowable open source?

Yes, the BPMN, CMMN and DMN engines are Apache 2.0. The modelling studio and enterprise applications are commercial.

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
Flowable: How does it relate to Activiti and jBPM?

The same core developers built jBPM, then Activiti, then forked Activiti in 2016 to create Flowable.

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
Flowable: What does Flowable Enterprise cost?

Nothing is published. It is quoted per deployment by the vendor.

Flowable: Why choose it over Camunda?

CMMN case management is a first-class engine, which matters when work is exception-driven rather than a fixed sequence.

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