Friday, June 27, 2025
Analyse Gas Usage in Starknet Transactions with Walnut Flamegraphs
If you've ever looked at a Starknet transaction and wondered where all the gas goes — we’ve got the answer.
@marijamijailovic
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.”
Apoorv Sadana
CEO at Karnot, Appchain Wiz 🧙♂️
“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
“I think Walnut is very important and that you [the Walnut team] are doing very valuable work for Starknet.”
Amanusk
Devtools at Starkware
“Walnut is an essential tool for debugging complex transactions with nested calls and large amounts of calldata. Walnut helped me with a massive blocker on the Bitcoin inscriptions project. 🌰”
“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
CEO at Enso Finance
“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
“Had to debug an OpenZeppelin tx on Starknet Sepolia—Walnut made it way too easy. Lifesaver!”
Adam Borco
Co-founder of Atomiq Labs
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.
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.
Blog
From the Walnut blog
Friday, May 2, 2025
Debugging and Transaction Simulations Are the Most Requested Features by Blockchain Developers
Starknet is an ecosystem that made a bold decision: it launched with its own custom language—Cairo. That means, among other things, it had to build everything from scratch. Cairo devs couldn’t rely on any of the existing blockchain tooling available for Solidity, Ethereum, or other blockchain ecosystems.
@romanmazur
Monday, April 28, 2025
New Partnership with Arbitrum: Advancing Debugging for the Solidity MultiVM
Walnut Labs is partnering with Offchain Labs—the team behind Arbitrum—to improve the debugging experience across the Arbitrum stack. This effort is part of our broader mission to bring modern debugging and monitoring tools to emerging rollup ecosystems.
@romanmazur