Tired of slow feedback loops and clunky wallet workflows in web3 dev? ethui bundles Foundry/Anvil integration, contract exploration, and multi-wallet support into one desktop tool. We're in Gitcoin. Donate to keep it open-source → https://t.co/HnkhA5Kara $1+ helps. Closes Oct

What was your biggest web3 dev win in 2025? Shipped a new dapp? Finally got multi-wallet testing working? Contributed to an open source project? Drop it below. We want to hear what you built this year.

Test your dapp from any wallet's perspective with ethui's impersonator wallets. No private key needed. Just input any address and interact with websites and chains as if you own that wallet. When connected to anvil chains (local or remote), you can submit unsigned

Why local-first for Ethereum dev? Fast and reproducible environment. No network delays. Quick feedback loops. ethui integrates with anvil and forge to give you a complete local environment Build and test contracts without waiting for network confirmations

Try it at https://t.co/dmG5N3gSWL or clone from GitHub and host it yourself

Interact with contracts using ethui Explorer Connect to local or remote Anvil chains via RPC (HTTP or websockets), see transaction history, and interact with contracts directly When connected to ethui wallet, ABIs from your file system automatically decode contracts

Testing on multiple chains at once? Most devs: Switch networks manually, lose context, restart tests ethui: Connect to multiple chains simultaneously, no switching needed Your local dev environment shouldn't fight you

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🔮 Transaction simulations in ethui Preview transactions before sending—success/failure, token transfers, state changes. Uses revm (same as forge) to simulate locally. No 3rd-party services, works on Anvil. Debug and validate without updating chain state. #EthereumDev #Web3

Why ethui is desktop-native, not browser-based: ✓ Not restricted to browser sandbox ✓ Reachable system-wide, not just one browser ✓ Better performance and native OS integration ✓ Works with any browser, all at once Built for developers who need real tools.

Most wallets require separate browser profiles. Switch, lose context, repeat. ethui: setup multiple wallets and manually switch between them seamlessly. Connect different chains simultaneously. No browser profile hacks. Just development. https://t.co/PHYNUydTxZ

thousands of onchain builders live, work, and ship from Portugal. but, they rarely gather in the same place... time to change that: introducing Onchain Lisbon:

Testing with specific accounts on Anvil? ethui auto-uses anvil_impersonateAccount instead of unlocking wallets. Benefits: → No private key exposure → No manual signing → Secure fast-mode testing → Prevents replay attacks One less thing to think about while

⚡ Dev tip: Skip transaction confirmations on test chains ethui's Fast Mode auto-approves all transactions on local/test networks. No clicking through MetaMask popups while testing. How it works: → Automatically detects test chains → Skips security checks → Maintains

We're at @EFDevcon. If you see someone in an ethui shirt, come say hi 👋

Docs:

Why ethui's anvil support is different: Most wallets (MetaMask, Rabby) break on anvil restarts/reverts because they cache nonces locally. ethui detects anvil chains, recalculates nonces from scratch, tracks restarts/reverts in real-time. Your wallet just works. Always.

Ever needed to test your dapp with multiple wallets simultaneously? Without ethui: Create separate browser profiles, switch between them, lose context. With ethui: Multiple wallets in one instance, seamless switching, and maintaining all connections. No browser profile hacks.

This feature is in development. Want to contribute? GitHub: https://t.co/cwDDfevVOp What's your biggest pain point with forge traces?

🔧 Technical Deep Dive: Forge traces that don't suck Real problem: Forge traces get impossibly large. Even simple tests become unreadable walls of terminal text. We're solving this. Watch ethui's new forge traces UI (coming soon): • Run tests through UI instead of terminal

How ethui integrates with Foundry: 🔧 Monitors forge compilation outputs in real-time 🔧 Matches on-chain bytecode to local contracts 🔧 Auto-detects anvil restarts and reverts 🔧 Indexes ABIs for instant contract interaction 🔧 Syncs nonces across the entire toolchain