What Is Tenderly?

Tenderly's standout feature is that it allows a transaction to be examined step by step, either before it is sent to the network or after it has been sent. Developers can see in which function, on which line and for what reason a failed transaction reverted; they can examine the transaction's gas consumption and the state changes it caused. The simulation feature, on the other hand, lets you see the outcome of a transaction in advance before broadcasting it to the real network.

The platform also offers private test environments that copy the state of the mainnet at a particular moment, alerts triggered by events in contracts and automated transaction workflows. These tools are used to try a DeFi protocol's new update under real liquidity conditions or to notice a suspicious movement instantly. Some wallets and applications also use similar simulation infrastructure to show users the likely outcome of a transaction before they confirm it.

Tenderly is a commercial service; although its basic features are offered on a free tier, advanced usage is paid. It does not replace local development tools such as Hardhat and Foundry; it is used to complement them.