Debug Transactions on Starknet

Cairo Developers use Walnut to discover and fix bugs in their Smart Contracts.

Trusted by the best.
StarknetLogoStarkwareArgent Wallet LogoDojoCF

Debug and Simulate Cairo Transactions with Ease.

Features

Understand Every Detail of Your Starknet Transactions.

Insight

Debugger with Memory Details
Inspect variable states at every step of transaction execution.

Analysis

Live Error Monitoring
Stay ahead of issues with real-time error detection and alerts.

Experiment

Transaction Simulator
Simulate and perfect transactions before deploying on-chain.

Multi-chain

Support for Appchains
Debug and monitor transactions effortlessly across Starknet appchains.

Cost Optimisation

Gas Profiler
Save on gas with detailed insights into transaction costs.

Testimonials

Developers love Walnut

“Transaction Debugging and Simulations are a big missing piece on Starknet, so it’s great to see Walnut providing developers with these essential tools.”

“Debugger and transaction simulator is a big missing piece in Starknet. At Argent, we are excited that this gap is being filled with Walnut.”

Sergio Garcia
Cairo Developer at Argent

“Debugging or simulating transactions is an absolutely critical task for any on-chain developer. We cannot wait to have Walnut integrated with Karnot and Madara Appchains.”

“I think Walnut is very important and that you [the Walnut team] are doing very valuable work for Starknet.”

Amanusk
Devtools at Starkware

“Debugging transactions and performance monitoring are pain points on Starknet today. Every DeFi protocol builder woud benefit from better tooling, and it’s great to see Walnut addressing this need.”

Vukašin Manojlović
DEFI developer at Nostra

“At Cartridge, we see a lot of interest in transaction debugging and simulation. Walnut has the potential to become a critical tool for game developers building on Starknet.”

tarrence v
CEO at Cartridge

“With Enso, we are not yet on Starknet. However, seeing a debugger and simulator like Walnut is a great testament to Starknet’s maturing devtools ecosystem, making it more appealing to new developers. We need a debugger and simulator to ship anything on Starknet, as we rely on this tooling in all EVM ecosystems and cannot build without it.”

Connor

“We are thrilled about the Walnut integration with Dojo. Step-by-step debugging with instant replay of transactions will be another string to the bow for all the sensei building on Dojo.”

Glihm
Lead dev at Dojo

“At Nimbora, we are big supporters of Walnut and the transaction debugger and simulator for Starknet. We are looking forward to using it with Nimbora and integrating it with Devnet and Rivet, our new developer-focused wallet.”

Edi Sinovčić
CEO at Spaceshard

Blockchain Research and Engineering

More from Walnut Labs

Starknet / Cairo

Cairo Playground
A web playground for Cairo developers to explore the CairoVM and experiment with writing Cairo code online.

Aztec / Noir

Noir Package Registry
An online catalog of Noir libraries where developers can discover, search, and download libraries for their projects.

Optimism / Superchain

Walnut Lite
A fully open-source, local transaction debugger and simulator for the EVM, initially launching on the Superchain. Read more in our blog.

Optimism / Superchain

OP Scan
A fully open-source, lightweight, local transaction explorer purpose-built for the OP Stack and the Superchain. Runs on a laptop.

From the Walnut blog