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Castov vs Fallow

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

Castov compared with Fallow
DetailCastov logo CastovFallow logo Fallow
What it doesFast, 100% client-side developer platform with zero-data logging Codebase intelligence for TypeScript and JavaScript
StageNot given Startup
FoundedNot given 2026
Based inNot given NL
Pricing modelFree Free
PricingAll tools are free with no usage limits. The site may show ads in the future to cover running costs. Not given
Key features
  • Multi-timezone support with IANA database and daylight saving time
  • JSON to TypeScript conversion
  • JWT decoder and inspection
  • Cron expression parser and generator
  • End-to-end encrypted environment variable vaults
  • P2P multiplayer canvas with WebRTC and CRDT
  • Steganography for hiding encrypted secrets in images
  • Service Worker API mocker for frontend testing
  • Encrypted URL shares with hash fragment storage
  • 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
What makes it different
  • Zero-data logging: no keystroke sent to external servers, all processing in browser memory
  • 100% client-side operation works entirely offline
  • Unified ecosystem across web, CLI, and AI agents via MCP Server
  • Sub-millisecond performance with local execution
  • Tool chaining and piping for seamless multi-stage workflows
  • 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
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)1 +1 (up) since last check32 no change since last check
Trust Flow (Majestic)18
Citation Flow (Majestic)1940
Referring domains (Majestic)7208

4 details filled in for both companies.

More alternatives to Castov More alternatives to Fallow

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