Can we rebuild it?

Can we rebuild MetaMask?

Build a Chrome extension like MetaMask — a MetaMask alternative you own.

Deciding to build your own MetaMask Chrome extension is technically fascinating, but security-critical software makes an un-audited alternative dangerous. Managing private keys and handling decentralized web transactions requires rigorous cryptographic auditing where single bugs mean total loss of funds.

Users

12M

Rating

★ 2.7

The listing record

Name	MetaMask
Store rating	2.7 / 5 · 5.9K ratings
Users	12M+
Store listing	Chrome Web Store ↗
Analyzed	16 September 2026

What MetaMask does

MetaMask is the world's most secure and flexible crypto wallet, trusted by millions of users to buy, sell, and swap digital assets. Manage your portfolio, interact with dapps, and jump into the decentralized web. Crypto made easy – Buy, sell, swap, and earn directly in your wallet – Choose from thousands of tokens – Connect to dapps across multiple chains – Try DeFi, buy meme coins, collect NFTs, explore web3 gaming, and more Advanced industry-leading security protects you – Know what you're signing before you transact – Live threat surveillance safeguards your wallet – Designed for privacy, control what you share – MEV and front-running protection Live support 24/7 – Around-the-clock support from our (human!) customer service experts SUPPORTED NETWORKS Every major network like Ethereum, Bitcoin, Solana, BNB Chain and more.

What the store says

★ 2.7 from 5.9K ratings · 12M users

Pulled live from the Chrome Web Store listing at analysis time.

Can PlugThis rebuild MetaMask?

NOT REALLYNot really — this one has a real moat.

“Self-custody key management and crypto signing are too security-critical for a DIY extension.”

MetaMask requires battle-tested cryptographic key derivation, secure hardware integration, and audited transaction simulation to keep funds safe. A subtle bug or storage oversight in an un-audited build could result in irreversible financial loss. While building a basic RPC transaction signer is technically possible, trust and rigorous security audits form an insurmountable moat.

What's actually hard to replicate

Security audits & formal verificationCryptographic key isolationHardware wallet integrationsPhishing and malicious contract feeds

What you'd plug into

Public RPC Nodes

Querying blockchain state and contract balances

free tiers available via Alchemy, Infura, or public endpoints

Why build your own MetaMask alternative

Zero analytics or RPC telemetry tracking
Custom transaction parsing tailored to specific contracts
Tailored RPC fallback logic across private nodes

What it costs vs what you'd save

The original: MetaMask is free to install, though it takes a percentage fee on built-in token swaps.

Your version: While MetaMask is free to install, building your own version does not offer meaningful cost savings and introduces massive personal security risks.

The starter prompt

Starter prompt — paste into PlugThis

Build a read-only crypto portfolio and gas tracking extension. Let me enter public wallet addresses to monitor their token balances using public EVM RPC endpoints, with custom alerts when gas prices hit defined thresholds.

Build it with PlugThis →

Features you could add that MetaMask doesn't have

Because you own the code, these are a follow-up prompt away — tap one to add it to the prompt above.

Read-Only Portfolio Tracker — Track wallet balances across chains via public RPCs without ever exposing private keys.
Gas Price Monitor — Get alerts in your browser toolbar when Ethereum network base fees drop below a target.

Questions about rebuilding MetaMask

Can't I just inject window.ethereum with a custom extension?

Yes, injecting a Web3 provider via content scripts is simple, but safely storing private seed phrases and preventing malicious Dapp exploitation requires specialized cryptographic architecture.

Is it safe to build a read-only portfolio tracker instead?

Yes. A read-only balance viewer or transaction watcher that never holds private keys is completely safe and very buildable in PlugThis.

How to build it yourself

1
Open PlugThis and start a new build
Head to PlugThis and start a new Chrome extension. You're describing a MetaMask alternative you'll own outright — no store subscription.
2
Paste the starter prompt
Paste the starter prompt above. PlugThis expands it into a full Manifest V3 extension — popup, content scripts, and service worker included.
3
Connect your own keys
Wire in Public RPC Nodes using your own account — the build uses your credentials, so there's no per-seat fee.
4
Review, tweak, and load it
Review the generated code, ask for tweaks in plain English, then download and load the unpacked extension in Chrome to try it.
5
Publish it (optional)
When you're happy, publish your MetaMask alternative to the Chrome Web Store — or just keep it as a private tool for yourself.

Build your own MetaMask alternative

Describe it in plain English. PlugThis generates the full Manifest V3 Chrome extension in about two minutes.

Build it with PlugThis →

More teardowns

We run the same teardown on any Chrome extension — what it does, whether a self-built alternative holds up, and the prompt to make one. Tear down another extension, or see the extensions we've actually rebuilt and filmed — real build times, real prompts, real recordings.

Sources & verification

All facts pulled live from the Chrome Web Store listing ↗.
The verdict is drafted by the PlugThis teardown engine — an opinion about buildability, not affiliation with MetaMask.
Written by PlugThis, which builds Chrome extensions from plain-English prompts.

Published and last updated 16 September 2026. Figures reflect the Chrome Web Store listing on that date and may have changed since.