It checks its own work
Each build compiles the contract and checks the app. If something fails, the agent reads the error and fixes it, up to three times, before handing back to you.
Say it. Sign it. Ship it.
G$ deployed this week
Preview2.48M
+31.6% vs last week
Contracts compiled14,902
Audited building blocks
Every contract starts from battle-tested blocks.
Savings circles, tip jars, ticketing and G$ payouts, built on audited OpenZeppelin contracts, then shaped to your prompt.
How it works
From sentence to smart contract in one sitting
You own the code and the keys. GoodBuild writes, tests and packages. Your wallet does the signing.
Describe
“A tip jar for our football club that splits G$ 70/30 between coach and kit fund.”
Refine
The contract and the front end are written and checked together. Try the live preview and ask for changes in the chat.
Sign & deploy
Your wallet signs each contract onto Celo Sepolia. GoodBuild never holds your keys.
Publish
Put the app on its own address, your-app.goodbuildit.xyz, and share the link.
What you can build
Start from a brief that already works
Pick one and change the details, or describe something new in your own words.
Inside the builder
See every step, read every line
Chat on one side, your running app on the other. Nothing happens behind a curtain.
contract TipJar {
using SafeERC20 for IERC20;
error ZeroTip();
function tip(uint256 amount) external {
if (amount == 0) revert ZeroTip();
uint256 toCoach = (amount * coachShare) / 100;
gd.safeTransferFrom(msg.sender, coach, toCoach);
gd.safeTransferFrom(msg.sender, kitFund, amount - toCoach);
}
}The contract is yours to read
The Contract tab shows the Solidity GoodBuild wrote, with G$ handled as an ERC-20 token and clear custom errors. The Code tab shows the React front end.
A preview that really runs
Your app runs in the browser as you build it, in desktop and mobile sizes. If it crashes, one click sends the error to the agent.
Every prompt saves a version
Try a bold change without worrying. Go back to any earlier version in two clicks. Reverting your files never touches a contract you have already deployed.
Safety
Careful by default, honest about the limits
Real money deserves plain answers about what GoodBuild does and doesn't protect you from.
Your keys never leave your wallet
GoodBuild prepares the transaction and your wallet signs it. We can't deploy, move funds or act for you, because we never hold your private key.
- delegatecall
- selfdestruct
- inline assembly
- tx.origin auth
Risky patterns are refused
A compiler check rejects these in generated contracts, which build on OpenZeppelin's audited libraries.
Generated code isn't audited
The libraries are audited. The contract written for you isn't, so we label it clearly. Review it before it handles real funds.
Pricing
Pay for what a build costs
You see an estimate before each build, so the cost is never a surprise.
Now
Free
Building is free during the testnet beta on Celo Sepolia. Test networks use test tokens, so nothing you do here spends real money.
After the beta
Cost + 25%
You pay the actual AI cost of each build plus 25%, shown in US dollars with the G$ amount alongside.
Network fees for deploys go to the network, from your own wallet.
FAQ
Questions people ask first
Want the longer version? The docs walk through everything step by step.
Do I need to know how to code?
No. Describe what you want in everyday words and refine it in the chat. The code stays visible if you want to read it.
What is G$?
G$ is GoodDollar, a token on the Celo network. Generated apps can collect, split and pay out G$, and GoodBuild treats it as a standard ERC-20 token.
Which network do apps run on?
Celo Sepolia, Celo's test network, during the beta. Test tokens have no real value, so it is a safe place to try ideas.
Can I deploy and share my app today?
You can deploy to Celo Sepolia by signing from your own wallet. Then publish the front end to its own address, your-app.goodbuildit.xyz, and share the link.
What does publishing do?
GoodBuild builds your latest saved version into a website on its own address. Anyone with the link can open it and connect their own wallet. You can update or unpublish it at any time.
Who can use GoodBuild?
You must be 18 or over. GoodBuild isn't available to US persons or in comprehensively sanctioned regions.
Is there anything I can't build?
Yes. Sports betting is out of scope. GoodBuild builds dApps and websites, but for now there is no separate server or database behind them.
What would your community build?
One sentence is enough to start, and it's free during the testnet beta.