What Is Sui (SUI)? A Plain-English Guide

Sui is a newer layer-1 blockchain built by Mysten Labs, a team of ex-Meta engineers from the abandoned Diem project. Like its cousin Aptos, it uses the Move language — but it organises data in an unusual 'object' model that lets simple transactions settle very quickly. This guide explains what Sui is in plain English and how to think about it without hype.

What is Sui?

Sui (pronounced 'swee') is a layer-1 blockchain — a base network in the same family as Bitcoin and Ethereum, but much newer. Its main network launched in May 2023. It is built by Mysten Labs, a company founded by engineers who worked on Meta's abandoned Diem (Libra) project.

That shared heritage is why Sui and Aptos are often mentioned together: both came out of the Diem team and both use the Move language. But they made different design choices, so they are cousins, not copies.

How Sui works

Sui is a proof-of-stake network, so validators lock up SUI to confirm transactions and earn rewards. Its most distinctive idea is the object model.

• Everything is an object. Instead of tracking the world as one big shared ledger of account balances, Sui treats each coin, token or item as a separate object with its own owner.
• Simple transfers skip the queue. When a transaction only touches objects you alone own — like sending a coin — Sui can finalise it very fast without needing the whole network to agree on ordering. More complex, shared transactions go through fuller consensus.
• Move under the hood. Sui apps are written in its own version of Move, designed to handle these objects safely.

The goal is low latency and high throughput for everyday actions. As always, headline 'transactions per second' figures are best-case lab numbers; real usage is lower.

What is the SUI token for?

SUI is the native token of the network, with three main roles:

• Paying fees — transactions and data storage on Sui are paid for in SUI.
• Staking — holders can stake or delegate SUI to validators to help secure the network and earn rewards. See what is staking.
• Governance — SUI is used to vote on network decisions.

SUI has a capped maximum supply of 10 billion tokens, though a large portion was not yet in circulation at launch and is released gradually over time.

Sui vs Aptos: the short version

Because they share roots, people constantly compare the two. The simplest distinction: Aptos keeps a more traditional account-and-ledger structure and leans on parallel execution; Sui rebuilds around independent objects so that simple, single-owner transactions can settle almost instantly. Both are fast, both are young, and both depend on attracting real, lasting usage to matter.

Where to go next

To go deeper, read about the Move programming language, compare Sui with Aptos, or learn the practical steps in how to buy Aptos (the same approach applies to SUI) and how to store coins safely.

Frequently asked questions