The Arbitrum testnets are designed for testing purposes and are connected to the respective Ethereum testnets, using test Ether with no real-world value.

Arbitrum Sepoliafunctions as a testnet chain that replicates the capabilities of Arbitrum One's main network. Integrated with the Sepolia testnet, it provides developers with a secure platform for experimenting with and assessing their smart contracts prior to deploying them on the mainnet.

Arbitrum Goerliis a testnet chain that mirrors the functionality of the Arbitrum One mainnet. It is connected to the Ethereum Goerli testnet, enabling developers to test their smart contracts in a risk-free environment before deploying them on the mainnet.

Stylusemploys Nitro technology and enables efficient smart contract development using programming languages like Rust, C, and C++. Leveraging Arbitrum's EVM equivalence, Stylus contracts achieve impressive speed and reduced gas fees. Full interoperability between Solidity and Stylus contracts opens up new possibilities, while substantially lowering memory costs unlocks innovative use cases for blockchain technology.