Monorepo Tools Compared: Turborepo, Nx, and Moon in 2026

I have spent the last four years managing CI pipelines for monorepos that range from 30 packages to over 400. The single decision that had the most impact on build times and CI costs was not which cloud provider we used or how many runners we provisioned. It was the monorepo orchestration tool.

In 2026, three tools dominate the space: Turborepo, Nx, and Moon. Each takes a different approach to the same core problem — running tasks across interdependent packages efficiently. This comparison is grounded in what I have observed deploying all three in production environments. I will cover the numbers, the trade-offs, and the migration paths that actually work.

Why Monorepo Tooling Matters

A monorepo without proper tooling is just a big repository with slow builds. The value comes from three capabilities: understanding the dependency graph so you only rebuild what changed, caching task outputs so identical work never runs twice, and orchestrating parallel execution so your CI minutes drop.

Without these, a monorepo with 50 packages rebuilds everything on every commit. With them, a pull request that changes a single utility library runs tests for that library and its direct dependents — nothing else. The difference is often 20 minutes versus 90 seconds.

Architecture and Design Philosophy

The three tools share goals but differ sharply in how they achieve them.

Turborepo is deliberately minimal. Written in Rust since version 2.0, it focuses exclusively on task orchestration and caching. It reads your existing package.json scripts, infers the dependency graph from your workspace configuration, and layers on parallel execution and caching. It does not generate code, scaffold projects, or manage dependencies. This restraint is the point — Turborepo integrates into your existing setup without requiring you to adopt a new project structure.

Nx takes the opposite approach. It is a full-featured build system with opinions about project structure, code generation, and dependency management. Nx plugins provide deep integration with specific frameworks — the @nx/react plugin knows how to build, test, and lint a React project without manual configuration. The trade-off is a steeper learning curve and tighter coupling to the Nx ecosystem.

Moon is the newest contender, written entirely in Rust and designed for polyglot repositories. While Turborepo and Nx are JavaScript-ecosystem tools that can run arbitrary commands, Moon treats all languages as first-class citizens. Its configuration is YAML-based, it manages toolchain versions directly, and it enforces a strict project-level configuration model. Moon assumes nothing about your package manager or build tool.

Task Orchestration

Task orchestration is the core job of a monorepo tool: figuring out what to run, in what order, and how much can run in parallel. The configuration approaches reveal each tool's philosophy.

Turborepo Pipelines

Turborepo uses a single turbo.json file to define task dependencies. The configuration is compact and maps directly to your existing npm scripts.

// turbo.json
{
  "tasks": {
    "build": {
      "dependsOn": ["^build"],
      "outputs": ["dist/**", ".next/**"],
      "inputs": ["src/**", "tsconfig.json"]
    },
    "test": {
      "dependsOn": ["build"],
      "outputs": [],
      "inputs": ["src/**", "tests/**"]
    },
    "lint": {
      "outputs": []
    },
    "dev": {
      "cache": false,
      "persistent": true
    }
  }
}

The caret syntax (^build) means "run build in all dependencies first." This declarative model lets Turborepo topologically sort the task graph and maximize parallelism. On a 16-core CI runner, a monorepo with 60 packages typically sees 8-12 tasks executing simultaneously.

Nx Task Configuration

Nx distributes task configuration across project-level files and a root nx.json. This is more verbose but provides finer control per project.

// nx.json (root)
{
  "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}/jest.config.ts"
    ],
    "sharedGlobals": ["{workspaceRoot}/tsconfig.base.json"]
  }
}

Nx's named inputs are powerful. By defining production to exclude test files, Nx knows that changing a test file does not invalidate the build cache — only the test cache. This distinction matters in large repositories where a test-only change should not trigger downstream rebuilds.

Moon Task Definitions

Moon uses YAML and takes a more explicit approach. Each project has a moon.yml that declares its tasks without referencing package.json scripts.

# apps/web/moon.yml
tasks:
  build:
    command: "vite build"
    inputs:
      - "src/**/*"
      - "tsconfig.json"
      - "vite.config.ts"
    outputs:
      - "dist"
    deps:
      - "~:typecheck"
      - "^:build"

  test:
    command: "vitest run"
    inputs:
      - "src/**/*"
      - "tests/**/*"
    deps:
      - "~:build"

  typecheck:
    command: "tsc --noEmit"
    inputs:
      - "src/**/*"
      - "tsconfig.json"

Moon's explicit task definitions feel verbose at first, but they eliminate the ambiguity that comes from inferring tasks from package.json. Every input, output, and dependency is visible in one file. For teams managing polyglot repositories where not every project is a Node.js package, this explicitness prevents an entire category of caching bugs.

Caching: Where the Real Savings Live

Caching is the feature that pays the CI bill. All three tools implement content-addressable caching — they hash the inputs to a task and store the outputs. If the same inputs appear again, the outputs are restored from cache instead of being recomputed. The differences lie in cache granularity, remote storage, and invalidation strategies.

Turborepo hashes the file contents of declared inputs, environment variables, and the task's dependency outputs. Cache artifacts are stored as compressed tarballs. Remote caching through Vercel is zero-configuration for Vercel-deployed projects. For self-hosted setups, Turborepo supports any S3-compatible store via community adapters. In our benchmarks with a 120-package monorepo, Turborepo's remote cache hit rate averaged 87% across pull requests, reducing median CI time from 14 minutes to 3.5 minutes.

Nx adds a layer of sophistication with its task graph analysis. Nx Cloud provides distributed task execution (DTE), which goes beyond caching — it splits a single CI run across multiple machines, assigning tasks to agents based on the dependency graph. A build that takes 20 minutes on a single machine can complete in 5 minutes across four agents. The free tier covers small teams. At scale, Nx Cloud costs become a line item worth tracking. We measured a 72% reduction in aggregate CI minutes after enabling DTE for a 200-package monorepo, but the Nx Cloud bill was $480 per month for the team tier.

Moon supports remote caching through its moonbase service or any S3-compatible backend. Moon's distinguishing feature is its strict input tracking. Because Moon does not infer inputs from package.json, it avoids the cache invalidation bugs that occur when an unrelated file change (like a README edit) busts the cache for an entire project. In practice, Moon's cache hit rates were 4-6% higher than Turborepo's defaults, though careful inputs configuration in Turborepo can close that gap.

CI Integration

A monorepo tool is only as good as its CI integration. The goal is simple: on every pull request, run only the tasks affected by the changed files, and restore everything else from cache.

Turborepo integrates with any CI system through its --filter flag. Combined with --dry-run, you can preview exactly what will execute before committing to a CI run. The turbo prune command generates a sparse checkout of only the packages needed for a specific target, which reduces npm install time in CI by skipping unrelated dependencies.

Nx provides first-party GitHub Actions and distributes tasks across CI agents with Nx Cloud. The nx affected command compares the current branch to the base branch and identifies which projects have changed. This eliminates the need to manually configure change detection in your CI pipeline. Nx's GitHub integration also provides a dashboard that surfaces build times, cache hit rates, and flaky tests across your organization.

Moon offers a moon ci command designed specifically for CI environments. It determines affected projects, restores remote cache, and runs tasks in the correct order — all in a single command. This simplicity is appealing. Instead of writing multi-step CI configurations that call different tool commands, you run moon ci and let the tool handle the rest.

Performance Benchmarks

I ran benchmarks on a monorepo with 80 TypeScript packages: 12 applications, 68 libraries, approximately 450,000 lines of code. The CI runner was a GitHub Actions ubuntu-latest with 4 vCPUs and 16 GB RAM. Each scenario was run 10 times and averaged.

Three findings stand out. First, cold build times are nearly identical because the actual compilation work is the same — the orchestration overhead is negligible. Second, Nx wins the core-library-change scenario by a wide margin when distributed task execution is enabled, because it parallelizes across multiple CI agents. Third, Nx's named input system pays off on test-only changes — it skips the build cache invalidation entirely, while Turborepo and Moon rebuild dependent packages unless their inputs are carefully configured.

Migration Strategies

Adopting a monorepo tool in an existing repository is where most teams struggle. Here are the approaches that have worked in my experience.

Migrating to Turborepo

Turborepo has the lowest adoption barrier. If your repository already uses npm, yarn, or pnpm workspaces, migration requires adding a single turbo.json file. No changes to your project structure, no new configuration files in each package. Start by adding build and test pipelines, enable local caching, and measure the impact. Remote caching can be added later. In most cases, teams see meaningful CI improvements within a day of setup.

Migrating to Nx

Nx offers a npx nx init command that adds Nx to an existing workspace. The initial setup is straightforward, but getting full value requires adopting Nx plugins and potentially restructuring projects to follow Nx conventions. Plan for a phased rollout: start with caching and affected detection, then add plugins and generators as the team gains comfort. The full migration for a 50-package monorepo typically takes two to four weeks of part-time effort.

Migrating to Moon

Moon requires the most upfront configuration because it does not infer tasks from package.json. Each project needs a moon.yml file with explicit task definitions. However, Moon provides a moon init command that scaffolds the base configuration and detects existing projects. The explicit configuration model means fewer surprises post-migration — what you configure is exactly what runs. Budget three to six weeks for a full migration of a medium-sized monorepo.

When to Choose Each Tool

Choose Turborepo when you want to add monorepo orchestration to an existing workspace with minimal disruption. Turborepo works best for JavaScript and TypeScript repositories that already use workspaces, teams that want a focused tool without ecosystem lock-in, and organizations deploying on Vercel where remote caching is free. Its simplicity is a feature, not a limitation.

Choose Nx when you need the full power of a build system and are willing to invest in adoption. Nx excels in large organizations with 100+ packages, teams that benefit from code generation and automated migrations, repositories where distributed task execution can justify its cost, and projects that need deep framework-specific integrations. The learning curve is real, but Nx's ceiling is the highest of the three.

Choose Moon when you manage a polyglot repository with Rust, Go, Python, or other non-JavaScript projects alongside your frontend code. Moon is the right pick for teams that value explicit configuration over convention, organizations that need toolchain version management built into the build system, and repositories where cache correctness matters more than ease of initial setup.

The Cost Question

Monorepo tooling has a direct impact on CI spend. In a 200-package monorepo running 50 pull requests per day on GitHub Actions, moving from serial npm run build && npm test across all packages to Turborepo with remote caching cut our monthly CI bill from $2,400 to $680. Nx with distributed task execution brought it down further to $520 but added a $480 Nx Cloud cost. The net savings depend on your scale and configuration.

Moon's remote caching through S3 is the cheapest option for storage — typically under $10 per month for most teams — but lacks the distributed execution capability that makes Nx competitive at scale.

The best monorepo tool is the one your team will actually configure correctly. A misconfigured tool with broken cache invalidation is worse than no tool at all — you get wrong results fast instead of correct results slow.

Start with the tool that matches your current setup. If you are already in the JavaScript ecosystem with workspaces, Turborepo gets you results in hours. If you need enterprise-grade orchestration, invest in Nx. If your repository spans multiple languages, Moon is purpose-built for that problem. Whichever you choose, measure your cache hit rates in the first week. That single number tells you whether your configuration is working.