Sei Testnets
Sei Testnets
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Sei Testnets

ℹ️ Introduction To Sei Network Environments for Development

Sei uses a multi-chain setup to support every stage of the development lifecycle — from early testing to live deployment. This approach helps developers build, test, and iterate with confidence.
Update Flow:
All updates are first rolled out on Devnet for stability checks, then pushed to Testnet for broader testing and validation. Only after passing these stages are updates released to Mainnet.
This structured rollout ensures a safer development process, giving teams time to test thoroughly and provide feedback before any changes go live.
Sei offers multiple environments to support safe and efficient dApp and smart contract development:

Testnet

A public staging environment that closely simulates mainnet conditions.
Use it to test apps in a real-world setup before going live.
  • Purpose: Staging
  • Chain ID: atlantic-2
  • EVM Chain ID: 1328 or 0x530

Devnet

An internal testing chain for early-stage development and integration testing.
Ideal for prototyping and testing new features in isolation.
  • Purpose: Testing
  • Chain ID: arctic-1
  • EVM Chain ID: 713715 or 0xAE3F3

Local Chains

Run your own Sei chain locally for full control and flexibility.
Useful for debugging, testing features, and experimenting with smart contracts.
  • Purpose: Development
  • Chain ID: Custom (default: sei-chain)