# Overview (https://docs-orhepa2tm-ton-core-docs.vercel.app/llms/ecosystem/explorers/overview/content.md)



Explorers are web tools for reading blockchain data. They let you look up accounts, transactions, blocks, and smart contracts, making it easy to verify activity and debug issues.

### Explorer [#explorer]

A blockchain explorer is a website that indexes on-chain data and presents it in a searchable user interface (UI). In TON, explorers commonly show account balances, recent transactions, jettons and non-fungible tokens (NFTs), contract code and state, and links to related blocks and messages.

### What explorers show [#what-explorers-show]

* Balances and assets: TON, jettons, and NFTs held by an address
* Transactions and messages: history, fees, phases, and traces
* Blocks and validators: block contents, masterchain and shardchain details
* Smart contracts: code, state, disassembly, and known contract type
* Analytics: top entities, volumes, gas, fees, and network health

### Indexers [#indexers]

Indexers continuously read blocks from nodes, parse messages and transactions, and store them in a database optimized for queries. Explorers rely on these indexers to provide fast search, traces, higher-level events, and historical views beyond what a single node exposes by default.

### Explorers comparison [#explorers-comparison]

| Explorer     | Type            | Mainnet                                               | Testnet                                      | Official |
| ------------ | --------------- | ----------------------------------------------------- | -------------------------------------------- | -------- |
| Tonviewer    | General-purpose | [tonviewer.com](https://tonviewer.com/)               | [Testnet](https://testnet.tonviewer.com/)    | No       |
| Tonscan.org  | General-purpose | [tonscan.org](https://tonscan.org/)                   | [Testnet](https://testnet.tonscan.org/)      | No       |
| Tonscan.com  | General-purpose | [tonscan.com](https://tonscan.com/)                   | -                                            | No       |
| TON Explorer | Low-level/core  | [explorer.toncoin.org](https://explorer.toncoin.org/) | [Testnet](https://test-explorer.toncoin.org) | Yes      |

> Official: maintained by the TON Foundation or an affiliated team

The [verifier tool](https://verifier.ton.org/) powers contract code verification.