> ## Documentation Index
> Fetch the complete documentation index at: https://companyname-a7d5b98e-closes-94-guidebook-more.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Retracer

[Retracer](https://retracer.ton.org/) is a classic TVM transaction tracing tool that provides detailed inspection of transaction execution. It's useful for:

* Understanding complex transaction flows;
* Debugging smart contract behavior;
* Analyzing gas usage and performance.

Some explorers display links to Retracer on their transaction pages. Otherwise it's recommended to use a more modern [TxTracer](/tvm/tools/txtracer) tool.

Its source code can be found on [GitHub](https://github.com/ton-blockchain/tvm-web-viewer/).

<img src="https://mintcdn.com/companyname-a7d5b98e-closes-94-guidebook-more/asgCOhC7IgfmtBMm/resources/images/retracer.png?fit=max&auto=format&n=asgCOhC7IgfmtBMm&q=85&s=0beca1f17a7e4e5c97bc8c5d022c349c" alt="Retracer screenshot" width="2500" height="1479" data-path="resources/images/retracer.png" />

On this screenshot, key elements of its interface are visible:

* Transaction details — Sender, contract, amounts, time, LT, fees, and balances;
* **C5** button — Display action list: complete details of all actions performed during the transaction;
* **Logs** button — Detailed logs for deeper debugging;
* List of instructions (on the left) — Steps taken by execution of the contract on TVM;
* Stack (on the right) — Stack during execution of current instruction.