Castov vs Steward

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 Steward
Detail	Castov	Steward
What it does	Fast, 100% client-side developer platform with zero-data logging	A Mac app that turns GitHub pull-request notifications into a sorted inbox with AI-assisted code review
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	Not given
Pricing model	Free	Paid
Pricing	All tools are free with no usage limits. The site may show ads in the future to cover running costs.	$10 one-time purchase at launch, then $20 for future customers. All future updates included. 14-day free trial available.
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	Sorted inbox that separates pull requests into Needs my eyes and FYI categories Morning report with daily briefing of pending reviews Layered diff viewer with logical code organization Code folding for TypeScript, JavaScript, and Ruby Keyboard shortcuts for quick actions Reviews ranked by importance and impact Automatic morning report even when app is quit
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	Layers diffs logically by code flow rather than alphabetically so you read them in writing order Separates actionable notifications from informational ones so less noise reaches your inbox Runs entirely on your Mac with no code sent to external servers
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	2 −4 (down) since last check	Not checked yet no change since last check
Trust Flow (Majestic)	1	0
Citation Flow (Majestic)	19	0
Referring domains (Majestic)	7	0

5 details filled in for both companies.

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