Castov vs BracketView

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 BracketView
Detail	Castov	BracketView
What it does	Fast, 100% client-side developer platform with zero-data logging	Privacy-first JSON workspace for viewing, formatting, validating, and querying API data
Stage	Not given	Startup
Founded	Not given	2025
Based in	Not given	Not given
Pricing model	Free	Freemium
Pricing	All tools are free with no usage limits. The site may show ads in the future to cover running costs.	Free: $0 forever with JSON viewer, formatter, validator, tree, graph, node, table, JSONPath, JQ, diff, schema tools, 5 MB uploads, 20 AI actions per month, and 5 encrypted snapshots with 10 minute expiry. Monthly: $3 per month with 50 MB uploads, unlimited snapshot links up to 2 hours expiry, unlimi
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	Real-time JSON validator JQ and JSONPath query support JSON diff and comparison AI JSON fixer for malformed data Performance Mode for files up to 50 MB Nine UI languages including English, Chinese, Japanese, Korean, Portuguese, Spanish, French, German, and Russian Webhook Tester with request capture and response mocking
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	Privacy-first design with all core tools running client-side in your browser Unified workspace replacing multiple single-purpose tools for JSON work and API debugging No data selling with optional encryption for cloud features Affordable Pro plan at $3/month or $27/year with unlimited AI and larger uploads
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)	1 +1 (up) since last check	4 +1 (up) since last check
Trust Flow (Majestic)	1	2
Citation Flow (Majestic)	19	21
Referring domains (Majestic)	7	34

5 details filled in for both companies.

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