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Prompt Builder

Assemble massive LLM context prompts from your codebase.

Prompt Builder — file selection

Modern LLMs like Claude (1M tokens) can digest entire codebases in a single prompt. The challenge is assembling that prompt — selecting the right files, formatting them, tracking token count.

RepoPrompt does this, but it costs money and caps you at ~35k tokens. Prompt Builder is free, open-source, and has no limits.

Open a folder. Check files from the tree — folders select recursively. Exclude patterns like *.css, *.test.ts. Write instructions. Hit Copy. Done.

$ brew install --cask alexrett/tap/prompt-builder
Download DMG Source on GitHub
Prompt Builder — empty state

Releases

v1.0.0Mar 14, 2026

Prompt Builder v1.0.0

Native macOS app for assembling LLM context prompts from your codebase.

Features

  • Project file tree with recursive folder selection
  • Tri-state checkboxes (checked / unchecked / partial)
  • Smart filtering (node_modules, .git, binaries, .gitignore)
  • Exclude patterns by glob masks (e.g. *.css, *.md, *.test.ts)
  • Live token counter
  • One-click build & copy to clipboard

Install

Download PromptBuilder.dmg, open it and drag to Applications.

Signed and notarized with Apple Developer ID.

Requirements

  • macOS 13.0 (Ventura) or later
  • Universal binary: Apple Silicon + Intel
platform macOS 13+
architecture universal (arm64 + x86_64)
framework SwiftUI
license MIT
privacy fully offline, no telemetry
update brew upgrade --cask alexrett/tap/prompt-builder
uninstall brew uninstall --cask alexrett/tap/prompt-builder