dotenvx excels at
- Encrypting .env files for safe Git commits
- Cross-language runtime injection
- CI/CD pipeline secret delivery
- Multi-environment key management
- Preventing accidental secret leaks with precommit hooks
dotenvx vs env-sync
dotenvx encrypts .env files and injects them at runtime. env-sync synchronizes .env secrets across machines on your local network. They solve different problems — and can work together.
What each tool does
dotenvx is built by the creator of dotenv. It focuses on encrypting .env files so they can be safely committed to Git, and injecting them at runtime across any language or framework. Each environment gets its own key pair with AES-256 encryption and Secp256k1 key wrapping.
env-sync focuses on keeping .env state consistent across multiple machines on a local network. It discovers peers automatically via mDNS, transfers secrets over SSH or mTLS, merges changes with per-key timestamps, and keeps versioned backups.
Feature-by-feature comparison
| Dimension | env-sync | dotenvx |
|---|---|---|
| Primary job | Sync secrets across machines on a LAN | Encrypt .env files and inject vars at runtime |
| Architecture | Peer-to-peer mesh with mDNS discovery | CLI tool per app / per environment |
| Encryption at rest | Optional AGE (mandatory in secure-peer mode) | AES-256 with public-key cryptography |
| Transport security | SSH or HTTPS + mTLS (depending on mode) | No network transport — files are local or in Git |
| Peer discovery | Automatic via mDNS (Avahi / Bonjour) | Not applicable — no peer concept |
| Conflict resolution | Per-key timestamps + version-aware merge | File-level encryption — no merge behavior |
| Multi-environment | One secrets file per machine, mode-aware | Separate .env.production, .env.staging, etc. |
| Runtime injection | Shell eval via env-sync load | Cross-language injection via dotenvx run |
| CI/CD integration | Not primary focus — designed for LAN hosts | Strong — GitHub Actions, Vercel, Docker, etc. |
| Backup & recovery | Automatic backups (keeps last 5 versions) | Git history provides version control |
| Key management | AGE keypairs + SSH keys + mTLS certs | Secp256k1 keypairs per environment |
| Language support | Language-agnostic (manages .env files) | Explicit cross-language runtime support |
| Team onboarding | SSH trust or invitation-based approval | Share private keys with team members |
| Pricing | Free, open source (MIT) | Free, open source (BSD-3) |
| Written in | Go | Node.js / TypeScript |
Where each tool shines
env-sync excels at
- Keeping multiple machines in sync automatically
- Zero-config peer discovery on local networks
- Conflict resolution with per-key timestamps
- Explicit trust boundaries (SSH vs mTLS modes)
- Offline / air-gapped LAN operation
When to choose which
- Choose dotenvx when your primary need is encrypting .env files for safe version control and injecting them at runtime across different app environments and CI/CD pipelines.
- Choose env-sync when your primary need is keeping multiple developer workstations, servers, or edge nodes on the same LAN converged on the same secrets — without cloud dependencies.
- Use both together: Use dotenvx for per-app encrypted .env management in Git repos, and env-sync for cross-machine parity on your local infrastructure. They solve complementary problems.
Bottom line: dotenvx is a per-app encryption and injection workflow. env-sync is a per-network synchronization engine. If your pain is "secrets drift between my machines," env-sync is the direct solution. If your pain is "secrets leak when I commit .env files," dotenvx is the direct solution.