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Volley vs Hronaut

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 Hronaut
DetailVolley logo VolleyHronaut logo Hronaut
What it doesAPI sequence diagram tool with payloads on every arrow A separate, visible browser for every project your coding agent touches
StageNot given Startup
FoundedNot given Not given
Based inNot given Not given
Pricing modelFreemium Free trial
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 10-day free trial (no credit card required), then $4/month or $24/year per named user. Annual plan is 50% off the $48 cost of twelve monthly payments.
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
  • Isolated workspace per project with separate cookies and sign-ins
  • Watch, pause, and take over agent actions at any time
  • Test local applications and localhost environments
  • Support for signed-in applications and session handoff
  • Parallel agent execution with isolated workspaces
  • Resume after agent disconnection with workspace persistence
  • Local Web3 wallet interaction and approval
  • Side-by-side split view for comparing pages
  • Cross-platform support: Windows, macOS, Linux
  • Up to three active devices per subscription
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
  • Your personal Chrome stays completely private and separate from agent operations
  • Local-first design with profiles stored on your computer
  • Verifiable releases with SHA-256 hashes and GitHub build attestations
  • Source-available under a subscription license
  • No credit card required for 10-day trial
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 check12 −1 (down) since last check
Trust Flow (Majestic)32
Citation Flow (Majestic)2230
Referring domains (Majestic)830

5 details filled in for both companies.

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