Castov

Castov is a client-side developer platform and Model Context Protocol server that executes utilities locally.

Castov is a client-side developer platform and Model Context Protocol server that runs utilities in the browser, terminal, and AI agents. It provides tools for timestamps, dates, time zones, cryptography, JSON conversion, and diff checking. The platform executes operations locally with zero-data logging and supports pipeline actions to pass outputs across utilities. It is designed for software teams and developers who need offline-capable and privacy-focused utilities. Users can also utilize encrypted URL shares, GitHub-synced team vaults, a command line interface, and an MCP server compatible with Cursor and Claude.

Castov at a glance

Best for: Software engineer
Runs on: Web, CLI, Docker
Pricing: Free browser-based tools with optional account features
Released: October 2026
Category: AI coding tool
Website: castov.com

Key features

MCP server with 10 tools
Castov CLI
JSON to TypeScript conversion
Cron expression generator
Cryptographic pipelines
Encrypted URL shares
P2P multiplayer canvas
Local API mocker

Use it for

Format and validate JSON data
Convert Unix timestamps and time zones
Inspect JWT tokens and generate UUIDs
Share environment variables securely
Generate code and mock data

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