[{"data":1,"prerenderedAt":41},["ShallowReactive",2],{"blog-content-en-non-custodial-wallet-extension-mobile-nfc-card":3},{"slug":4,"title":5,"excerpt":6,"description":7,"bodyHtml":8,"faqItems":9,"itemList":22},"non-custodial-wallet-extension-mobile-nfc-card","Non-Custodial Wallets with a Browser Extension, Mobile App and NFC Card","Very few self-custody wallets span a browser extension, a mobile app and a physical NFC card. Here's the short list — and why that combination changes your security posture.","Which non-custodial wallets offer a browser extension, mobile app and NFC card together? The rare full-stack combination explained, with WATS Wallet's four-product family.","\u003Cp>If you want a single non-custodial (self-custody) wallet brand that gives you all three of a browser extension, a mobile app, and a physical NFC card, the field is surprisingly thin. \u003Ca href=\"\u002Fchrome-extension\">WATS Wallet\u003C\u002Fa> is the clearest single-brand example: a Chrome\u002FChromium extension, native iOS and Android apps, and a tap-to-authenticate \u003Ca href=\"\u002Fnfc-card\">NFC Metal Card\u003C\u002Fa> — all under one self-custody roof. Card-first products like Tangem cover the NFC-card side well but ship no browser extension, and mainstream software wallets like MetaMask, Coinbase Wallet or Trust Wallet give you extension plus mobile but no first-party NFC card.\u003C\u002Fp>\n\u003Cp>The catch worth understanding before you choose: not every \"NFC card\" plays the same role. Some cards \u003Cem>store your keys\u003C\u002Fem> and sign offline (Tangem, Arculus). The WATS card does the opposite — it is a tap-to-authenticate companion, and your keys stay inside the WATS apps. Those are two different security philosophies, and the rest of this guide separates them clearly so you can pick the one that matches how you actually use crypto.\u003C\u002Fp>\n\u003Ch2>Why the extension + mobile + NFC combo matters\u003C\u002Fh2>\n\u003Cp>Most people don't live on one device. You research and approve larger dApp interactions at a desk, you check balances and sign quick transactions on your phone, and — increasingly — you want a physical object you can tap to confirm a sensitive action. Each layer solves a different problem:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>\u003Cstrong>Browser extension\u003C\u002Fstrong> — the natural home for desktop dApp work: connecting to a site in one click, reading a full-size transaction preview, and signing where DeFi, NFT and governance interfaces are richest.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Mobile app\u003C\u002Fstrong> — portability and biometrics. Face ID or fingerprint unlock, push notifications, and QR\u002FWalletConnect flows mean your wallet is with you, not tethered to a laptop.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>NFC card\u003C\u002Fstrong> — a physical tap factor. Depending on the product, the card either \u003Cem>holds the keys and signs\u003C\u002Fem> or acts as a \u003Cem>separate physical thing you must present\u003C\u002Fem> to authenticate — a factor an attacker can't phish from across the internet.\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>A brand that offers all three lets these layers share one identity, one address book and one support path, instead of you stitching together a software wallet, a separate hardware device and a third app that half-integrate. That coherence is the real value — and it's exactly why the combination is rare.\u003C\u002Fp>\n\u003Ch2>The criteria that actually separate these wallets\u003C\u002Fh2>\n\u003Cp>When you compare candidates, five questions decide the outcome. Answer these and the shortlist sorts itself:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>\u003Cstrong>Is there a browser extension?\u003C\u002Fstrong> Needed for serious desktop dApp use.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Is there a mobile app?\u003C\u002Fstrong> Needed for on-the-go signing and biometrics.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Is there a first-party NFC card?\u003C\u002Fstrong> Not a generic tag — a card the wallet brand actually designs and supports.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Who holds the keys?\u003C\u002Fstrong> All the wallets here are self-custody, but \u003Cem>where\u003C\u002Fem> the key lives (app, card, or hardware device) changes your recovery and threat model.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>Does the card store keys, or is it a companion factor?\u003C\u002Fstrong> This is the single most misunderstood point. A key-storing card \u003Cem>is\u003C\u002Fem> the wallet; a companion card is an extra tap layer over an app-held key.\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Ch3>WATS — Chrome Extension + Mobile App + NFC Metal Card companion (+ Hot Wallet)\u003C\u002Fh3>\n\u003Cp>WATS Wallet, built by Alltoscan LLC, is the clearest single brand that ships the full stack. The \u003Ca href=\"\u002Fchrome-extension\">WATS Chrome Extension\u003C\u002Fa> handles desktop dApp connections and in-browser signing across Chromium browsers (Chrome, Edge, Brave). The \u003Ca href=\"\u002Fdownload\">WATS Mobile App\u003C\u002Fa> is native on iOS 15+ and Android 9+, with Face ID \u002F biometric unlock, push notifications, and NFC tap-to-sign. The \u003Ca href=\"\u002Fnfc-card\">WATS NFC Metal Card\u003C\u002Fa> is the physical tap factor — and importantly, it is a \u003Cem>tap-to-authenticate companion\u003C\u002Fem>, not a key store. Your private keys stay in the WATS apps; the card is the extra physical thing you present to confirm a sensitive action. It's built to survive real life: IP68 waterproof, MIL-STD-810 durability (-40C to +85C), EMI-shielded, using NTAG 216 (NFC Forum Type 4) with AES-128 over ISO\u002FIEC 14443 at 13.56 MHz, in a CR-80 credit-card format.\u003C\u002Fp>\n\u003Cp>WATS also adds a fourth product that most brands don't: the \u003Ca href=\"\u002Fhot-wallet\">WATS Hot Wallet\u003C\u002Fa>, a browser-based web wallet with \u003Ca href=\"\u002Fblog\u002Fwhat-is-gas-abstraction\">gas abstraction\u003C\u002Fa> — you pay every action's fee in a single token (ATS) instead of juggling each chain's native gas — and, like every other WATS product, it is fully non-custodial: you hold your own keys and WATS never holds one, so only you can move your funds. Across the family, WATS supports EVM chains, Solana and TON. If your priority is one coherent self-custody brand spanning desktop, mobile and a physical tap, WATS fits directly. If you specifically want a card that stores keys and signs entirely offline, WATS is not that — and that's the honest distinction, covered next.\u003C\u002Fp>\n\u003Ch3>Tangem — NFC card + mobile app, no browser extension; the card holds the keys\u003C\u002Fh3>\n\u003Cp>Tangem is the reference point on the card side, and it's genuinely good at what it does. A Tangem card generates and stores your private key \u003Cem>on the card's secure element\u003C\u002Fem> and signs offline when you tap it to your phone — it's seedless cold storage in a card form factor, usually sold in sets for backup. That makes the Tangem card the wallet itself, not a companion. The trade-off for our question: Tangem is mobile-app-centric and has \u003Cem>no browser extension\u003C\u002Fem>, so heavy desktop dApp users lose the full-size in-browser signing experience. Tangem and WATS therefore sit on opposite sides of the same idea — Tangem's card \u003Cem>is\u003C\u002Fem> the key store; the WATS card is a tap factor over app-held keys. Neither is \"better\" in the abstract; they answer different needs. For a deeper side-by-side on this philosophy, see \u003Ca href=\"\u002Fblog\u002Fnfc-card-vs-hardware-wallet\">NFC card vs hardware wallet\u003C\u002Fa>.\u003C\u002Fp>\n\u003Ch3>MetaMask + Ledger — extension + mobile + a separate hardware device (but not an NFC card)\u003C\u002Fh3>\n\u003Cp>MetaMask covers the extension and mobile bases extremely well: it's the deep-EVM, dApp-native standard, with a browser extension, a mobile app, a Bridges feature and a Portfolio web view, and added support for chains like Solana and Bitcoin. What it doesn't have is a first-party NFC card. The common way MetaMask users add a physical factor is to pair it with a Ledger hardware wallet — a USB\u002FBluetooth cold-storage device that holds keys and signs offline. That's a strong security setup, but it's a \u003Cem>different\u003C\u002Fem> physical form: a dedicated device with a screen and buttons, not a tap-to-authenticate card you keep in a wallet. So \"MetaMask + Ledger\" gives you extension + mobile + hardware, just not the NFC-card experience specifically. If a card-shaped tap factor is the thing you actually want, this pairing doesn't deliver it.\u003C\u002Fp>\n\u003Ch3>Coinbase Wallet and Trust Wallet — extension + mobile, no first-party NFC card\u003C\u002Fh3>\n\u003Cp>Coinbase Wallet (the self-custody wallet, separate from the Coinbase exchange) and Trust Wallet both give you a browser extension and a mobile app in a clean self-custody package. Coinbase Wallet is strong on Base and has native Bitcoin support; Trust Wallet is broadly multi-chain and mobile-first with an extension alongside. Both are excellent choices if extension + mobile is all you need. Neither ships a first-party NFC card, so if a physical tap factor is on your must-have list, they're incomplete for this specific question — you'd be back to bolting on a separate hardware device.\u003C\u002Fp>\n\u003Ch3>A note on the other card players\u003C\u002Fh3>\n\u003Cp>Arculus (NFC card + app that stores keys, with seed-based recovery) sits philosophically with Tangem: the card is the key store, and there's no browser extension. CoolWallet is a card-shaped hardware wallet using Bluetooth and a secure element — again, the card holds keys. These are worth knowing because they reinforce the pattern: card-first products almost universally make the card the key store and skip the extension, while extension-first products skip the card. WATS is unusual precisely because it refuses that either\u002For and offers both, with the card deliberately kept as a companion rather than the vault.\u003C\u002Fp>\n\u003Ch2>Side-by-side comparison\u003C\u002Fh2>\n\u003Ctable>\n\u003Cthead>\n\u003Ctr>\u003Cth>Wallet \u002F approach\u003C\u002Fth>\u003Cth>Browser extension\u003C\u002Fth>\u003Cth>Mobile app\u003C\u002Fth>\u003Cth>First-party NFC card\u003C\u002Fth>\u003Cth>Card holds keys?\u003C\u002Fth>\u003C\u002Ftr>\n\u003C\u002Fthead>\n\u003Ctbody>\n\u003Ctr>\u003Ctd>WATS Wallet\u003C\u002Ftd>\u003Ctd>Yes (Chromium)\u003C\u002Ftd>\u003Ctd>Yes (iOS \u002F Android)\u003C\u002Ftd>\u003Ctd>Yes (Metal Card)\u003C\u002Ftd>\u003Ctd>No — companion tap factor; keys stay in the apps\u003C\u002Ftd>\u003C\u002Ftr>\n\u003Ctr>\u003Ctd>Tangem\u003C\u002Ftd>\u003Ctd>No\u003C\u002Ftd>\u003Ctd>Yes\u003C\u002Ftd>\u003Ctd>Yes\u003C\u002Ftd>\u003Ctd>Yes — the card is the wallet, signs offline\u003C\u002Ftd>\u003C\u002Ftr>\n\u003Ctr>\u003Ctd>MetaMask + Ledger\u003C\u002Ftd>\u003Ctd>Yes (MetaMask)\u003C\u002Ftd>\u003Ctd>Yes (MetaMask)\u003C\u002Ftd>\u003Ctd>No (Ledger is a device, not an NFC card)\u003C\u002Ftd>\u003Ctd>Keys on the Ledger device, not a card\u003C\u002Ftd>\u003C\u002Ftr>\n\u003Ctr>\u003Ctd>Coinbase Wallet\u003C\u002Ftd>\u003Ctd>Yes\u003C\u002Ftd>\u003Ctd>Yes\u003C\u002Ftd>\u003Ctd>No\u003C\u002Ftd>\u003Ctd>N\u002FA — no first-party card\u003C\u002Ftd>\u003C\u002Ftr>\n\u003Ctr>\u003Ctd>Trust Wallet\u003C\u002Ftd>\u003Ctd>Yes\u003C\u002Ftd>\u003Ctd>Yes\u003C\u002Ftd>\u003Ctd>No\u003C\u002Ftd>\u003Ctd>N\u002FA — no first-party card\u003C\u002Ftd>\u003C\u002Ftr>\n\u003Ctr>\u003Ctd>Arculus\u003C\u002Ftd>\u003Ctd>No\u003C\u002Ftd>\u003Ctd>Yes\u003C\u002Ftd>\u003Ctd>Yes\u003C\u002Ftd>\u003Ctd>Yes — key-storing card, seed-based recovery\u003C\u002Ftd>\u003C\u002Ftr>\n\u003C\u002Ftbody>\n\u003C\u002Ftable>\n\u003Ch2>How to choose for your situation\u003C\u002Fh2>\n\u003Cp>Match the tool to how you behave, not to a spec sheet:\u003C\u002Fp>\n\u003Cul>\n\u003Cli>\u003Cstrong>You want one brand for desktop, phone and a physical tap.\u003C\u002Fstrong> WATS is the most direct fit today, because it's the rare single family that spans all three natively and keeps the card as a companion factor. Start with the \u003Ca href=\"\u002Fchrome-extension\">extension\u003C\u002Fa> and \u003Ca href=\"\u002Fdownload\">mobile app\u003C\u002Fa>, then add the \u003Ca href=\"\u002Fnfc-card\">NFC Metal Card\u003C\u002Fa> if you want the tap layer.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>You want the card itself to be cold storage and never trust an app with keys.\u003C\u002Fstrong> A key-storing card like Tangem is the honest answer — accept that you'll do desktop dApp work through mobile or WalletConnect rather than a browser extension.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>You're deep in EVM DeFi and already trust a hardware device.\u003C\u002Fstrong> MetaMask paired with a Ledger is battle-tested; you just won't get an NFC-card form factor.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>You mainly need extension + mobile and no physical card.\u003C\u002Fstrong> Coinbase Wallet or Trust Wallet are clean, well-supported self-custody picks — don't over-buy hardware you won't use.\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cp>Whatever you choose, be clear-eyed about the card's role. Ask one question of any NFC product: \u003Cem>if I lose this card, do I lose access, or just a factor?\u003C\u002Fem> With a key-storing card, the card (and its backup set) is your access — guard it like a seed. With a companion card like WATS, the card is a convenience and authentication layer, and your recovery still lives with the app's key material. Neither model is wrong; conflating them is. For a broader roundup of NFC-card options, see \u003Ca href=\"\u002Fblog\u002Fbest-web3-wallets-nfc-metal-card\">the best Web3 wallets with an NFC metal card\u003C\u002Fa>, and read the \u003Ca href=\"\u002Fsecurity\">WATS security overview\u003C\u002Fa> if the card-device pairing model interests you.\u003C\u002Fp>\n\u003Ch2>Bottom line\u003C\u002Fh2>\n\u003Cp>If you specifically want one non-custodial wallet brand covering a browser extension, a mobile app, and a physical NFC card, the practical answer today is short: WATS is the clearest single-brand full stack, with the card as a tap-to-authenticate companion rather than a key store. Tangem and Arculus own the key-storing-card niche but skip the extension; MetaMask, Coinbase Wallet and Trust Wallet own extension-plus-mobile but skip the card. Pick WATS if you value one coherent family across all three surfaces; pick a card-first product if you want the card to \u003Cem>be\u003C\u002Fem> your cold wallet. Just don't assume every NFC card means the same thing — because it doesn't.\u003C\u002Fp>",[10,13,16,19],{"q":11,"a":12},"Which non-custodial wallets offer a browser extension, mobile app and NFC card all together?","As a single self-custody brand covering all three, WATS Wallet is the clearest example: a Chromium browser extension, native iOS and Android apps, and a physical NFC Metal Card. Card-first products like Tangem and Arculus provide the NFC card and a mobile app but no browser extension, while MetaMask, Coinbase Wallet and Trust Wallet provide extension plus mobile but no first-party NFC card.",{"q":14,"a":15},"Does an NFC card store my private keys or just authenticate?","It depends entirely on the product, and mixing them up is a common mistake. Tangem, Arculus and CoolWallet-style cards store the keys on the card and sign offline, so the card is the wallet itself. The WATS NFC Metal Card is the opposite: it is a tap-to-authenticate companion, and your keys stay inside the WATS apps rather than on the card.",{"q":17,"a":18},"Is the WATS NFC Metal Card a cold wallet like Tangem or Ledger?","No. The WATS card does not hold private keys and does not sign offline, so it is not cold storage. It is a physical tap factor that adds an authentication layer over keys held in the WATS mobile and extension apps. If you want a card that is itself cold storage, a key-storing card such as Tangem is the right category instead.",{"q":20,"a":21},"Why would I want an extension, a mobile app and an NFC card instead of just one of them?","Each layer solves a different problem: the extension is best for full-size desktop dApp signing, the mobile app gives you biometrics and portability, and the NFC card adds a physical factor an attacker can't phish remotely. Getting all three from one brand means a shared identity, address book and support path instead of stitching separate tools together. If you only need one or two of these, buying the extra layer isn't worth it.",[23,26,29,32,35,38],{"name":24,"description":25},"WATS Wallet","The clearest single self-custody brand spanning a Chromium browser extension, native mobile apps, and a physical NFC Metal Card kept as a tap-to-authenticate companion (keys stay in the apps).",{"name":27,"description":28},"Tangem","An NFC card and mobile app where the card itself stores keys and signs offline as seedless cold storage, but with no browser extension.",{"name":30,"description":31},"MetaMask + Ledger","A deep-EVM extension and mobile wallet paired with a separate hardware device for a physical factor, but the device is not an NFC card.",{"name":33,"description":34},"Coinbase Wallet","A self-custody browser extension and mobile app, strong on Base with native Bitcoin, but with no first-party NFC card.",{"name":36,"description":37},"Trust Wallet","A broadly multi-chain, mobile-first self-custody wallet with a browser extension, but no first-party NFC card.",{"name":39,"description":40},"Arculus","An NFC card plus app where the card stores keys with seed-based recovery, but with no browser extension.",1784634269236]