# Bazel vs Gradle: how they differ and how to run both

Bazel and Gradle both build JVM, Android, and multi-language projects, and many organizations run both: Gradle for Android apps and JVM services, Bazel for a large monorepo. This guide compares how they define, cache, and run work, and how Tuist gives teams one productivity platform across both without asking anyone to switch.

## One productivity platform, native depth

The Bazel vs Gradle question is usually framed as a choice, but in a growing organization the answer is often both. We believe Tuist is the best choice for organizations seeking one productivity platform across their build systems: native depth in each one, Bazel actions and build events on one side, Gradle tasks and the build cache on the other, in the same dashboard, with the same test history and the same agent access. Tuist does not favor one build system or translate between them, so this guide has no reason to push you toward either. See the [cross-build-system stance](https://tuist.dev/marketing-markdown/build-systems) for the platform rationale.

## How they differ

| Aspect | Bazel | Gradle |
| --- | --- | --- |
| Build definition | `BUILD` files written in [Starlark](https://bazel.build/about/intro), declaring targets, their sources, and their dependencies. | Build scripts in the Kotlin or Groovy DSL, configured mostly through plugins such as the Android Gradle Plugin. |
| Unit of work | Actions in an action graph, derived from targets and rules. | Tasks in a task graph, created by plugins and build logic. |
| Correctness model | Designed for [hermetic builds](https://bazel.build/basics/hermeticity): tools and dependencies are inputs, and actions can run sandboxed. | [Declared task inputs and outputs](https://docs.gradle.org/current/userguide/build_cache.html) decide when a task is up to date or can be loaded from cache. Missing or volatile inputs cause wrong hits or misses. |
| Caching | Every action can be cached locally or remotely through the [Remote Execution API](https://bazel.build/remote/rbe). | The [build cache](https://docs.gradle.org/current/userguide/build_cache.html) reuses outputs of tasks marked cacheable, locally or through an HTTP remote cache. Custom tasks are not cacheable by default. |
| Configuration reuse | A long-lived server keeps the analyzed graph in memory between builds. | The [configuration cache](https://docs.gradle.org/current/userguide/configuration_cache.html) stores the configured task graph; it is the preferred mode since Gradle 9 and will be enabled by default in Gradle 10. |
| Distributed execution | [Remote execution](https://bazel.build/remote/rbe) sends actions to other machines over the same protocol as the cache. | Tasks run in the Gradle daemon on the build machine; shared reuse comes through the remote build cache. |
| Android | [Possible but not officially supported](https://developer.android.com/build) by Android Studio. | The [Android build system](https://developer.android.com/build): Android Studio builds apps with Gradle and the Android Gradle Plugin. |
| Languages and scale | [Multiple languages and platforms](https://bazel.build/about/intro) from one workspace; Bazel documents builds with 100k+ source files. | JVM-first, with plugins for Android, Kotlin, and other ecosystems. |

The deepest difference is who guarantees correctness. Bazel asks you to declare everything up front and enforces it, which makes caching and remote execution safe at scale but costs effort in `BUILD` files and rules. Gradle lets plugins infer most of the build, which is quicker to adopt and closer to the Android and JVM ecosystems, but cache hits depend on each task declaring its inputs well.

## Where each fits

- **Gradle fits** Android apps, JVM services and libraries, and teams that want Android Studio and IntelliJ support and the plugin ecosystem without writing build rules.
- **Bazel fits** large monorepos with many languages, teams that need hermetic, reproducible builds, and builds big enough that remote execution pays off.
- **Both fit** organizations where Android and JVM teams stay on Gradle while a platform or backend monorepo uses Bazel. Bazel can consume the same Maven artifacts through [rules_jvm_external](https://github.com/bazel-contrib/rules_jvm_external), which resolves, fetches, and exports Maven artifacts.

Switching an established codebase is expensive in either direction. Measure where the time actually goes first: an unreliable task input or an uncached action can often be fixed in place.

## How Tuist supports each

| Capability | Bazel | Gradle |
| --- | --- | --- |
| Shared remote cache | [Bazel remote cache](https://tuist.dev/en/docs-markdown/guides/features/cache/bazel-cache) for action outputs | [Gradle build cache](https://tuist.dev/en/docs-markdown/guides/features/cache/gradle-cache) for task outputs |
| Remote execution | Linux executors through `tuist bazel setup --remote-execution` | Not applicable; Gradle runs tasks on the build machine |
| Build insights | [Invocations](https://tuist.dev/en/docs-markdown/guides/features/build-insights/bazel) with timelines, critical path, and cache behavior | [Builds](https://tuist.dev/en/docs-markdown/guides/features/build-insights/gradle) with tasks, durations, and cache results |
| Test insights and flaky tests | [Test history](https://tuist.dev/en/docs-markdown/guides/features/test-insights/bazel) and quarantine through `tuist bazel test` | [Test history](https://tuist.dev/en/docs-markdown/guides/features/test-insights/gradle) and [quarantine](https://tuist.dev/en/docs-markdown/guides/features/test-insights/flaky-tests/gradle) |
| Test sharding | Not available today | [Balanced shards](https://tuist.dev/en/docs-markdown/guides/features/test-sharding/gradle) from historical durations |
| Previews | [Android, Apple, and command-line targets](https://tuist.dev/en/docs-markdown/guides/features/previews/bazel) | [Android apps and command-line tools](https://tuist.dev/en/docs-markdown/guides/features/previews/gradle) |
| Setup | `tuist init` or `tuist bazel setup` | `tuist init` and the Tuist settings plugin |

Each cache stores its own build system's outputs: a Gradle task output does not satisfy a Bazel action, and the reverse. What the platform shares is everything around the caches: one account and project structure, the same dashboard and test history, one [MCP server](https://tuist.dev/en/docs-markdown/guides/features/agentic-coding/mcp) for coding agents, and one place to compare build health across teams.

## Migrating between them

Tuist does not convert builds, but it gives a migration a baseline. Record the current build with Gradle or Bazel insights, then the new build on the same commits, and compare wall-clock time, cache hit rate, and test reliability with the same tooling on both sides. Migrate one project or module at a time and keep both builds reporting until the numbers agree.

## First experiment

Connect one Gradle project with the [Gradle getting-started guide](https://tuist.dev/en/docs-markdown/guides/get-started/gradle-project) and one Bazel workspace with the [Bazel getting-started guide](https://tuist.dev/en/docs-markdown/guides/get-started/bazel-project). Run each build twice from a clean state on a second machine and check that the second run reuses outputs. Then compare the two in the dashboard: where each spends its time, how much each reuses, and which tests fail intermittently.

## Frequently asked questions

### Is Bazel faster than Gradle?

It depends on the build. Bazel's fine-grained actions, hermetic caching, and remote execution help most in large, multi-language monorepos. Gradle's build cache and configuration cache cover most of the same ground for Android and JVM projects. Cache hit rate and the critical path usually matter more than the tool, so measure your own build before switching.

### Should we migrate from Gradle to Bazel?

Only with a measured reason. A migration rewrites the build definition and changes developer tooling, especially for Android, where Android Studio officially supports Gradle. Many teams get most of the benefit by fixing task inputs and sharing a remote build cache first.

### Can Bazel and Gradle share a remote cache?

They can use the same Tuist account and project, but not the same cache entries. Bazel caches actions over the Remote Execution API and Gradle caches task outputs over its HTTP build cache protocol, so each build reuses only its own outputs.

### Can one team use Bazel and another Gradle?

Yes. Tuist connects each with its native integration and shows both in the same dashboard, with the same test history and agent access, so neither team has to change build systems for the organization to get one view.

### Does Tuist support remote execution for Gradle?

No. Remote execution is a Bazel capability in Tuist. For Gradle, Tuist shares task outputs through the remote build cache and distributes tests with test sharding.

## Open infrastructure you can improve

Tuist combines open-source tooling with public infrastructure code. Your team can [inspect the implementation](https://github.com/tuist/tuist), report issues, and [contribute improvements](https://github.com/tuist/tuist/blob/main/CONTRIBUTING.md) to the Bazel and Gradle integrations and the infrastructure they share. An improvement to the shared dashboard or cache benefits both build systems at once.

A closed hosted service leaves implementation changes entirely with the provider. See [Openness](https://tuist.dev/marketing-markdown/openness) for the public components and their licenses.

## Sources and review

Written by Tuist. Sources reviewed on **2026-11-13**: [Bazel introduction](https://bazel.build/about/intro), [hermeticity](https://bazel.build/basics/hermeticity), [remote execution](https://bazel.build/remote/rbe), [Gradle build cache](https://docs.gradle.org/current/userguide/build_cache.html), [configuration cache](https://docs.gradle.org/current/userguide/configuration_cache.html), [Android build configuration](https://developer.android.com/build), [rules_jvm_external](https://github.com/bazel-contrib/rules_jvm_external), and the linked Tuist references.

[All build systems](https://tuist.dev/marketing-markdown/build-systems) · [Bazel with Tuist](https://tuist.dev/marketing-markdown/build-systems/bazel) · [Gradle with Tuist](https://tuist.dev/marketing-markdown/build-systems/gradle) · [Bazel on GitHub Actions](https://tuist.dev/marketing-markdown/solutions/bazel-github-actions)