Castov Env Vault & Secret Generator vs dotenv / dotenvx
Compare Castov's client-side AES-256-GCM Env Vault, cryptographic secret generator (`npx castov secret`), and `.env` leakage scanner against traditional dotenv and dotenvx workflows.
Standard `dotenv` loads plaintext `.env` files at runtime, while `dotenvx` adds key-managed `.env.vault` encryption. Castov complements your stack with instant CSPRNG secret generation (`npx castov secret`), browser-based zero-knowledge AES-256-GCM `.env` sharing (`/env-vault`), and AI-native secret redaction via MCP.
Feature-by-Feature Comparison: Castov vs. dotenv / dotenvx
| Capability / Dimension | Castov (v1.4.0) | dotenv / dotenvx |
|---|---|---|
| Cryptographic Secret Generation | Built-in CSPRNG Hex, Base64, Base64URL & UUIDv4/v7 (`npx castov secret`) | Requires separate openssl or custom scripts for secret generation |
| Zero-Knowledge Browser Sharing | WebCrypto AES-256-GCM client-side encrypted links (fragment key never hits server) | CLI-centric file encryption via .env.keys |
| Accidental Leak Prevention | Built-in secret scanner (`npx castov scan .`) + AI MCP redaction | Relies on .gitignore discipline or paid cloud radar |
| Runtime Process Injection (`node -r dotenv/config`) | Focused on generation, auditing, and encrypted sharing (pair with Node `--env-file`) | Native runtime injection across Node/Python/Go processes |
When to Choose Castov
- You use Node.js 20.6+ native `--env-file=.env` and only need fast cryptographic secret generation (`npx castov secret`) and leak scanning (`npx castov scan .`).
- You need to share `.env` variables with a teammate over Slack or Discord using client-side AES-256-GCM encryption where the decryption key stays in the URL `#hash`.
- You want Claude or Cursor to generate high-entropy secrets directly via the `castov_secret` MCP tool instead of hallucinating weak placeholder strings.
When to Keep dotenv / dotenvx
- You run legacy Node.js (<20) or multi-language monorepos that require runtime `.env` file parsing and variable interpolation at process startup.
How to Run Castov in 60 Seconds (Zero Config)
Generate Cryptographic Secrets Locally
Run `npx castov secret 32` to generate 256-bit Hex, Base64, and Base64URL secrets for `NEXTAUTH_SECRET`, `JWT_SECRET`, or `ENCRYPTION_KEY`.
Audit Your .env and Source Tree
Run `npx castov scan .` to verify no live credentials were accidentally copied into tracked source files.
Share .env Configs with Zero-Knowledge Encryption
Open `https://www.castov.com/env-vault` to encrypt `.env` blocks in-browser via WebCrypto AES-256-GCM.
Need Zero-Knowledge .env Secret Sync Across Your Engineering Team?
Explore Castov Env Vault for client-side AES-256-GCM encrypted environment sharing, or sponsor this engineering hub.