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Volley vs Fallow

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

Volley compared with Fallow
DetailVolley logo VolleyFallow logo Fallow
What it doesAPI sequence diagram tool with payloads on every arrow Codebase intelligence for TypeScript and JavaScript
StageNot given Startup
FoundedNot given 2026
Based inNot given NL
Pricing modelFreemium Free
PricingFree: editor, local diagrams, share links, SVG and PNG export, CLI, 3 saved diagrams, HAR imports up to 8 requests, 200 hosted API and MCP calls a month, 1 webhook inbox with 25 requests a month, 1 recording link with 3 recordings. Pro: $9/month or $90/year (billed in advance), up to 1,000 saved dia Not given
Key features
  • Plain-text sequence diagram editor with real-time rendering
  • Request and response payloads displayed on every arrow
  • HAR file import with automatic redaction of secrets
  • Webhook inbox to capture and diagram provider deliveries
  • Recording links to collect customer HAR files as diagrams
  • Drift Check to update diagrams when APIs change
  • SVG and PNG export for sharing and embedding
  • AI agent support via MCP server, HTTP API and CLI
  • README embeds that update when diagrams are edited
  • Presentation mode for step-through walkthroughs
  • 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
  • No account needed to write and share diagrams
  • AI can write diagrams from plain-text syntax
  • Built from real traffic: HAR files, webhooks and customer recordings
  • 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)3 no change since last check32 no change since last check
Trust Flow (Majestic)38
Citation Flow (Majestic)2240
Referring domains (Majestic)8208

4 details filled in for both companies.

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