ethertools.
FOR THE CURIOUS. AND THE SERIOUS.

Ethereum,
finally makes
sense.✳

From “what’s a blockchain?” to “I can read these bytes.” Learn by seeing, trying, and having a few aha moments.

Start from zero →Just here for the tools
Free to explore. No wallet. No prerequisites.
An illustrated Ethereum learning playground: linked blocks, an open notebook and a floating Ethereum crystal 0xAha! Now I get it.BIG IDEAS. SMALL, FRIENDLY STEPS.
Understand the basicsSee ideas in motionGet your hands on the bytesAlways keep learning
THERE’S A PLACE FOR YOU HERE

A good place to begin.

Never heard of gas? Already writing contracts?
Pick up wherever you are.

01
ABSOLUTE BEGINNER

Start from zero

No wallet. No jargon. Just a little curiosity.

120 lessons ↗02
GETTING COMFORTABLE

Find your way around

Understand the things you see in wallets and apps.

100 lessons ↗03
READY TO BUILD

Go under the hood

Read the bytes. Trace the execution. Build intuition.

280 lessons ↗
LESS READING ABOUT IT. MORE GETTING IT.

Follow the journey
of a transaction.

What actually happens after someone presses send? Walk through it, one small step at a time.

Explore the whole lesson →
AN INTERACTIVE LITTLE EXPLAINER
A transaction moves from Maya’s wallet through signing, node verification, peer sharing, a mempool, block inclusion and finality. Maya’s instructionTOLeo’s public addressAMOUNT0.01 ETHPretend transactionFirst, the wallet prepares a request. Maya’s walletSignature added ✓Private key stays in wallet 🔒Signed request WalletSigned requestNode AChecks ✓Node BChecks ✓Node CChecks ✓Node DChecks ✓NODE C’S LOCAL MEMPOOLVerify.Then share. Pending requestsProposed blockMaya → Leo · 0.01A proposer includes it. Nodes check the result. BlockIncludedCheckpointAgreementFinalizedValidator checkpoint votes support finality.Simplified model · not one vote per transaction
Illustration · no network calls
Prepare
→
Sign
→
Share
→
Include
→
Finalize

Maya prepares an instruction: send 0.01 pretend ETH to Leo.

A local simulation. Nothing is signed or sent to a network.

USEFUL THINGS, BEAUTIFULLY SIMPLE

Your everyday toolbox.

Explore all 10 tools ↗
EVERYDAY ESSENTIAL

Wei / Gwei / ETH

Convert units exactly. Every digit stays where it belongs.

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DEVELOPER LAB

ABI encoder

Give a function its arguments. See the bytes come together.

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DEVELOPER LAB

Calldata decoder

Separate the selector, inspect the words, follow the offsets.

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CRYPTOGRAPHY

Keccak-256

Turn text or hex into an Ethereum-style fingerprint.

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EVERYDAY ESSENTIAL

Address checker

Check the format. Get the EIP-55 checksum.

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LEARN BY DOING

Gas calculator

Your gas inputs. A clear breakdown of the fee.

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Calculations happen in your browser. No RPC keys. No wallet connection.

?
IT’S OKAY TO ASK THE BASIC QUESTIONS

Big words. Little explanations.

A blockchain isn’t magic. A smart contract isn’t a legal document. Let’s untangle the words, one at a time.

Open the plain-English glossary →