Castov vs C2PA Lab

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 C2PA Lab
Detail	Castov	C2PA Lab
What it does	Fast, 100% client-side developer platform with zero-data logging	Free browser-based C2PA Content Credentials checker and provenance viewer
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	Not given
Pricing model	Free	Free
Pricing	All 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	C2PA Manifest Viewer - inspect manifest store, claim, assertions, ingredients and raw JSON C2PA Metadata Inspector - read signer, source disclosure, counts, identifiers and checksum in structured table C2PA URL Checker - inspect remote image, video, audio or PDF provenance from public URL C2PA PDF Checker - check Content Credentials in PDF files and review signature validation evidence Local browser inspection via WebAssembly - no file uploads Supports JPEG, PNG, WebP, AVIF, HEIC, HEIF, SVG, MP4, MOV, MP3, WAV and PDF files up to 200 MB Cryptographic verification state with signer and issuer information Provenance timeline with recorded actions and ingredient references
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	Files never leave your device - all inspection runs locally in your browser Independent tool not affiliated with or endorsed by the Coalition for Content Provenance and Authenticity Reports evidence not verdicts - no authenticity percentages or false claims Multiple inspection views for different user needs and expertise levels Privacy-focused with non-sensitive usage metrics only via Google Analytics
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	1 no change since last check
Trust Flow (Majestic)	1	2
Citation Flow (Majestic)	19	26
Referring domains (Majestic)	7	16

4 details filled in for both companies.

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