Turborepo vs Nx vs Bazel vs Moon (2026): A Monorepo Decision Guide

Choosing a monorepo tool is not really a question of which is fastest. All four tools here cache aggressively, and all four will make a slow repository faster. The real question is how much build system you are willing to own.

This guide compares the four tools that matter in 2026, with the versions current at the time of writing: Turborepo 2.10, Nx 23, Bazel 9.2 and Moon 2.4.

The short answer

If you have a JavaScript or TypeScript repository and you want faster CI without changing how your team works, use Turborepo. If you want the build system to also generate code, enforce module boundaries and distribute work across CI machines, use Nx. If your repository spans several languages and correctness matters more than convenience, use Bazel. If you want language-agnostic builds without Bazel's learning curve, use Moon.

Decision matrix

How to read this table: the further right you go, the more the tool knows about your repository — and the more you have to tell it. Turborepo asks almost nothing and gives you caching. Bazel asks you to declare every input and output, and in exchange gives you builds that are genuinely reproducible.

Turborepo 2.10 — the sensible default

Turborepo does one thing extremely well: it works out what can be skipped, and skips it. You describe your tasks and their dependencies, and it handles ordering, parallelism and caching.

// turbo.json
{
  "$schema": "https://turbo.build/schema.json",
  "tasks": {
    "build": {
      "dependsOn": ["^build"],
      "outputs": ["dist/**", ".next/**", "!.next/cache/**"]
    },
    "test": {
      "dependsOn": ["build"],
      "outputs": ["coverage/**"]
    },
    "lint": {
      "dependsOn": ["^lint"]
    },
    "dev": {
      "cache": false,
      "persistent": true
    }
  }
}

That is close to a complete configuration for a real repository. The ^build syntax means "build this package's dependencies first". outputs tells Turborepo what to cache — get this wrong and you will cache nothing, which is the single most common Turborepo mistake.

Note that this is Turborepo 2 syntax. If you are reading an older guide that uses a pipeline key, that was renamed to tasks in version 2.

Where it wins: adoption cost. You can add Turborepo to an existing pnpm or npm workspace in an afternoon without restructuring anything. Remote caching through Vercel means a build produced on one machine is reusable by every other machine and by CI.

Where it stops: Turborepo tracks dependencies at package level, not file level. If package B depends on package A and you edit A's README, B is considered affected and rebuilt. On a repository with a handful of packages this costs nothing. At fifty or more packages, it starts wasting real CI minutes.

Turborepo also has no opinion about how your code is organised. It will not generate a new package for you, and it will not stop one application importing from another application's internals.

Nx 23 — a build system with opinions

Nx is what you reach for when the repository itself has become the problem: too many packages, unclear ownership, and nothing stopping anyone importing anything.

// nx.json
{
  "targetDefaults": {
    "build": {
      "dependsOn": ["^build"],
      "inputs": ["production", "^production"],
      "cache": true
    },
    "test": {
      "inputs": ["default", "^production"],
      "cache": true
    }
  },
  "namedInputs": {
    "default": ["{projectRoot}/**/*", "sharedGlobals"],
    "production": [
      "default",
      "!{projectRoot}/**/*.spec.ts",
      "!{projectRoot}/**/*.md"
    ]
  }
}

Look at namedInputs. That is the file-level dependency tracking Turborepo does not do: this configuration says a Markdown file or a spec file is not part of a production build, so changing one will not invalidate a downstream build. On a large repository, this is where the CI savings actually come from.

Nx adds three things Turborepo does not have:

• Affected commands. nx affected -t test runs tests only for projects genuinely touched by a change, based on the project graph.
• Code generators. nx g @nx/react:lib ui-buttons scaffolds a library matching your existing conventions — valuable when many people add packages.
• Module boundary rules. You can declare that anything tagged scope:admin may not import anything tagged scope:public, and have lint enforce it.

Nx Cloud additionally distributes tasks across several CI machines, assigning work based on historical timings rather than splitting it naively.

The trade-off: Nx is more configuration and more concepts. Some capability sits behind Nx Cloud, a commercial product with a free tier — not disqualifying, but a dependency worth entering deliberately.

Bazel 9.2 — correctness first

Bazel comes from a different tradition. Turborepo and Nx make your existing build faster. Bazel replaces your build entirely, and asks you to declare every input and output explicitly.

# BUILD.bazel
load("@aspect_rules_js//js:defs.bzl", "js_library")
load("@aspect_rules_ts//ts:defs.bzl", "ts_project")

ts_project(
    name = "lib",
    srcs = glob(["src/**/*.ts"]),
    declaration = True,
    tsconfig = "//:tsconfig",
    deps = ["//packages/shared:lib"],
)

js_library(
    name = "pkg",
    srcs = [":lib"],
    visibility = ["//visibility:public"],
)

Note deps and visibility: nothing is implicit. Bazel knows precisely what this target consumes, which is why it can guarantee that the same inputs produce the same outputs on any machine. That guarantee is what makes remote build execution safe — work can be farmed out to a fleet because results are deterministic.

Where it wins: repositories with more than one language, and organisations where a wrong build is expensive. If you ship Go services, a TypeScript frontend and a Python data pipeline from one repository, Bazel is the only tool here that treats all three as first-class.

Where it hurts: the learning curve is genuinely steep. BUILD files are written in Starlark. The JavaScript ecosystem assumes node_modules semantics that Bazel deliberately does not follow, and reconciling the two is ongoing work. Budget weeks, not days, and expect to need someone who owns the build.

Do not adopt Bazel because it is what large companies use. Adopt it because you have a polyglot repository and reproducibility is a requirement.

Moon 2.4 — the pragmatic middle

Moon targets the gap between Turborepo and Bazel: language-agnostic builds without Starlark.

# moon.yml
type: library
language: typescript

tasks:
  build:
    command: 'tsc --build'
    inputs:
      - 'src/**/*'
      - 'tsconfig.json'
    outputs:
      - 'dist'
    deps:
      - '^:build'

  test:
    command: 'vitest run'
    inputs:
      - 'src/**/*'
      - 'tests/**/*'
    local: true

Explicit inputs and outputs give file-level accuracy, and it is YAML rather than a new language. Moon also manages toolchain versions, so every developer and CI runner uses the same Node or Rust version without a separate version manager.

Where it wins: polyglot repositories that do not need Bazel's rigour, and teams who want explicit inputs without adopting Starlark.

The trade-off: a smaller ecosystem. Fewer integrations, fewer answered questions, fewer people who have hit your problem before. That is a real cost when something breaks at 6pm.

The thing that actually determines your CI time

For most teams the decisive factor is not the tool — it is whether remote caching is switched on and configured correctly.

Local caching only helps the machine that already did the work. CI containers usually start empty, so without a remote cache every pipeline run rebuilds everything from scratch. With one, a CI run can restore artefacts a developer already built on their laptop.

All four tools support remote caching:

• Turborepo — Vercel Remote Cache, or self-hosted implementations
• Nx — Nx Cloud, or a self-hosted cache
• Bazel — remote cache plus remote build execution
• Moon — Moonbase, or self-hosted

If you take one action after reading this, make it verifying that your remote cache is actually being hit. A misconfigured outputs array produces a cache that silently never hits, and the symptom is simply that CI stays slow.

Migration paths

• To Turborepo: incremental. Add turbo.json, route a few scripts through turbo run, keep everything else. Reversible in an afternoon.
• To Nx: nx init can adopt an existing workspace without restructuring. Start with caching only, add affected commands next, and adopt generators and boundary rules once the team is comfortable.
• To Bazel: not incremental in any meaningful sense. Convert one leaf package first, keep the existing build running alongside, and expect a long coexistence.
• To Moon: moderate. Tasks are declared per project in moon.yml, so it can be adopted package by package.

When not to use each

• Not Turborepo if you have more than about fifty packages and CI cost is material — package-level invalidation will rebuild too much.
• Not Nx if your team is small and the repository is simple; you will pay configuration cost for capability you are not using.
• Not Bazel unless you are polyglot and can dedicate someone to owning the build. Adopted casually, it becomes the thing nobody can debug.
• Not Moon if you need a large ecosystem and lots of prior art.
• None of them if you have one application and two libraries. Workspaces plus npm scripts is a legitimate answer, and a monorepo tool is overhead.

Recommendation

For most JavaScript and TypeScript teams in 2026, start with Turborepo. It gives you most of the available benefit for a fraction of the complexity, and it is easy to leave.

Move to Nx when the repository grows past the point where package-level invalidation is affordable, or when you need enforced structure rather than faster builds.

Choose Bazel when you are genuinely polyglot and reproducibility is a requirement, not a preference — and only with someone owning it.

Choose Moon when you are polyglot and pragmatic, and Bazel is more rigour than the problem deserves.

The worst outcome is adopting the most powerful tool available and configuring it badly. A well-configured Turborepo beats a poorly-configured Bazel every single day.

Frequently asked questions

Is Turborepo or Nx better in 2026?

Turborepo is better for teams that want faster builds with minimal setup. Nx is better for teams that also need code generation, enforced module boundaries and distributed CI execution. Turborepo is the safer default; Nx pays off once repository structure, rather than build speed, is the problem.

Can I migrate from Turborepo to Nx later?

Yes. Both work on standard package manager workspaces, so the repository layout does not have to change. nx init adopts an existing workspace, and you can enable caching first and add other features later.

Do I need Nx Cloud to use Nx?

No. Nx caches locally without it. Nx Cloud adds remote caching and distributed task execution across CI machines. You can also self-host a remote cache instead.

Is Bazel worth it for a JavaScript-only monorepo?

Usually not. Bazel's advantages are strongest in polyglot repositories that need reproducible builds. For JavaScript or TypeScript only, Turborepo or Nx deliver most of the benefit at a fraction of the cost.

How does Moon differ from Turborepo?

Moon is language-agnostic and requires explicit inputs and outputs per task, giving file-level change detection. Turborepo is JS/TS focused with package-level detection and less configuration. Moon also manages toolchain versions.

What actually makes monorepo CI faster?

Remote caching, more than tool choice. Without it, CI containers start empty and rebuild everything each run. With it, CI reuses artefacts built elsewhere. Verify your cache is being hit — a misconfigured outputs array means it silently never is.

Which monorepo tool has the lowest migration cost?

Turborepo. It layers onto an existing workspace, needs one configuration file, and can be removed as easily as it was added.

Do I even need a monorepo tool?

Not always. With one application and a couple of libraries, package manager workspaces and npm scripts are enough. These tools earn their cost when build times or repository structure start to hurt.