Compare Arbitrum vs. Starknet vs. zkSync

The next-generation layer 2 solution for Ethereum decentralized applications (dApps) allows developers to leverage their preferred tools while achieving cost-effective scaling for their projects. In this ecosystem, an aggregator functions similarly to a node in the Ethereum network, enabling client software to perform remote procedure calls (RPCs) to interact with an Arbitrum chain via a standard API. Once a client makes a request, the aggregator interacts with the EthBridge to generate transaction results, akin to the operation of an Ethereum node. Although most clients will typically route their transaction submissions through an aggregator for efficiency, it is not a strict requirement for operation. There are no restrictions on the number of aggregators that can be established, nor on who is eligible to serve as one. To enhance processing efficiency, aggregators often consolidate several client transactions into a singular message for submission to the Arbitrum chain. Additionally, Arbitrum features a specialized Sequencer that has the capability to prioritize transaction ordering and provide rapid transaction receipts, further optimizing the user experience. This innovative structure opens up new possibilities for developers looking to enhance their dApps on Ethereum.

Starknet functions as a decentralized ZK-Rollup on Ethereum, operating without permission and allowing any decentralized application (dApp) to attain boundless computational scale while maintaining Ethereum's security and composability. By generating STARK proofs off-chain and verifying them on-chain, Starknet successfully scales while safeguarding the integrity of Layer 1 Ethereum. Developers can seamlessly implement diverse business logic through Starknet Contracts, promoting Ethereum-level composability that encourages straightforward development and fosters innovation. The STARK Prover drives the StarkEx scalability engine, showcasing its capability to handle up to 600,000 transactions in a single proof on Mainnet, which highlights its efficiency and robustness. This combination of features positions Starknet as a vital infrastructure for the next generation of decentralized applications.

zkSync stands out as the most user-focused ZK rollup solution in the Ethereum ecosystem. This innovative scaling method has no limitations on the volume it can securely manage in Layer 2, setting it apart from other strategies. In contrast to optimistic rollups, it facilitates rapid and economically efficient transfers of assets between the ZK rollup and Layer 1. Notably, zkSync boasts the lowest transaction costs among all current and forthcoming rollups. Additionally, it offers features like meta-transactions, immediate confirmations with economic finality, and affordable privacy options. The design philosophy of zkSync emphasizes simplicity and enjoyment in the development process. Developers can easily integrate payments and atomic swaps using just a few lines of code. Moreover, zkSync allows for the creation of type-safe, functional smart contracts with Zinc, a Rust-based framework, and enables the deployment of existing EVM codebases with minimal adjustments. This combination of features makes zkSync an attractive choice for developers seeking efficiency and innovation in blockchain applications.