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Fallow vs Day

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Fallow compared with Day
DetailFallow logo FallowDay logo Day
What it doesCodebase intelligence for TypeScript and JavaScript One app. Every platform. All Day.
StageStartup Not given
Founded2026 Not given
Based inNL Not given
Pricing modelFree Open source
PricingNot given Not given
Key features
  • Health scoring and complexity analysis
  • Dead code and unused export detection
  • Code duplication detection
  • Architecture boundary enforcement
  • Styling drift detection
  • VS Code extension with Code Lens and fixes
  • CLI with local analysis
  • MCP server and agent integration
  • Runtime coverage with production data
  • Automatic code fixes
  • Native UI toolkits (AppKit, UIKit, Material Components, WinUI, GTK, Qt)
  • Shared Rust codebase for interface and logic
  • Localization with Fluent catalogs
  • UI testing with DayScript walkthroughs
  • Automated packaging and app store submission preparation
  • Accessibility annotations with native integration
  • Platform-specific extensions in Cargo crates
  • VS Code extension for development workflow
  • Crash reporting integration
  • Reusable components across apps
What makes it different
  • Reads entire repository as one graph in under a second
  • Checks problems between files that linters and TypeScript miss
  • Free and open source under MIT license
  • No source code uploaded; all analysis runs locally
  • Bootstrapped with no venture capital funding
  • Single Rust codebase compiles to native machine code for each target
  • Platform-native appearance and behavior without custom rendering
  • Keep existing Rust libraries unchanged and reuse across platforms
  • Full open source framework under MPL-2.0 with inspectable and modifiable code
  • Unified CLI and test format for all platforms and builds
Free planNot given Not given
Open sourceNot given Not given
PlatformsNot given Not given
Public APINot given Not given
Community votes00
DR (Domain Rating by Ahrefs)32 no change since last check29 no change since last check
Trust Flow (Majestic)81
Citation Flow (Majestic)4025
Referring domains (Majestic)20829

4 details filled in for both companies.

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