YubiKey 5Ci - Multi-Factor authentication (MFA) Security Key and passkey for iPhone/Android/PC, Dual connectors for Lighting/USB-C, FIDO Certified

The Yubico YubiKey 5Ci ease of use is exceptional, with a simple plug-in Lightning connector into your iPhone or iPad, or use the USB-C end for your Mac, and authentication happens instantly with a simple touch. There's no complicated setup, no batteries to worry about, and no software to constantly update. The functionality is comprehensive and impressive, supporting multi-factor authentication (MFA) across hundreds of services: Google, Microsoft, Dropbox, Facebook, password managers like 1Password and LastPass, and countless enterprise applications. It works seamlessly with modern passkey technology, making passwordless login a reality while providing hardware-level security that's virtually impossible to phish or hack. The value for money is outstanding when you consider the protection it provides. This single key replaces vulnerable SMS codes and app-based authenticators with military-grade security that protects your most sensitive accounts from breaches, identity theft, and unauthorized access. The speed is remarkable; authentication happens in under a second with a simple touch, making secure login faster than typing passwords or waiting for SMS codes. Durability is where the YubiKey truly shines. It’s built like a tank with a rugged design that's waterproof, crush-resistant, and has no moving parts or batteries to fail, meaning it will last for years of daily use. The connectivity flexibility is brilliant with dual connectors (Lightning for iOS devices and USB-C for modern Macs) built into one compact key, eliminating the need for adapters or multiple keys for different devices. Whether you're securing personal accounts or protecting business data, the YubiKey 5Ci delivers enterprise-grade security in an incredibly user-friendly package that works flawlessly across your Apple ecosystem. For anyone serious about protecting their digital life, this is an investment that pays for itself the moment it prevents a single account breach. Highly recommended!

I am very pleased with the Yubico YubiKey 5Ci. Shipping was prompt, and the security key arrived well-packaged and protected, with no signs of damage. The dual-connector design—featuring both USB-C and Lightning plugs—was exactly as advertised and ready for immediate setup. In terms of product quality, this YubiKey feels solid and reliable. The build quality gives confidence that it will withstand daily carry on a keychain, and the connectors seat securely into devices without wiggle or looseness. Setting it up with my accounts was straightforward; the configuration steps were clear and compatible with the MFA options in most services I use. Functionally, the key enhances security through hardware-based authentication rather than relying solely on passwords or SMS codes. It supports modern authentication standards such as FIDO2/WebAuthn and U2F, providing a practical second factor for logging into email, cloud services, password managers, and other online accounts that support security keys. The dual Lightning and USB-C connectors make it especially useful for iPhone users and other Apple devices that lack conventional USB ports. Yubico +1 From a value perspective, this security key offers strong protection at a reasonable cost compared with subscription-based alternatives or more complex enterprise solutions. Its broad platform compatibility—covering iOS, macOS, Windows, Linux, and many web services—adds versatility. While not every app supports hardware keys yet, the ecosystem continues to expand, and the YubiKey remains a robust, future-oriented investment in account security. Overall, this is a well-made, dependable MFA solution that combines convenience with significant security benefits, and I would confidently recommend it.

Works great for both older iPhones and new iPhones if you have a mix. Works well with computers as well

Protects Apple ID Password. This device was easy to implement (see YouTube, iphone security) and will protect you against theft of funds and loss of data from iCloud. This happens when thief watches or videos you enter passcode and then grabs phone from your hand or otherwise steals the phone. Thief, with passcode immediately changes Apple ID password, locking you out of all Apple devices. Has access to passwords in Password Keychain (never use that!) and can get into any banking or cash app used on the phone. You will be forever locked out of iCloud and all contacts, photos, available to thief. This works (tested) on iPhones 8+ and 11 Max Pro. Both use lightening connectors, have not tested usb-C. Apple ID Password can’t be changed without the device. You will need two, keep in different places, in case of loss or failure. DOES NOT WORK FOR USB-C ipad there is no key for iPad Apple ID protection. Safety tips: Protect (hide) passcode, put your hand over phone to shield it like you would at the ATM. use faceID, when it works. And to protect against SIM swaps, put a pin on your SIM. The provider default is ridiculous. Use 8 digits you can memorize. Need to enter this after shutdown at power up.

Works great! Much better than the other NFC encryption physical key I purchased. I was hoping has more storage space. It’s a bit small for me to put in a keychain. Maybe perfect for wallet. But difficult to put in a keychain. I needed NFC since having issues with SMS Trojan on my iPhone. Helps increase security for my iPhone.

This one is a bit pricey but it necessary if one still has an older ipad without USB-C. It works well. Apple has finally made their ipad USB-C port compatible with yubikey, I haven't tested that. I have used this key with windows and Mac PC's, as well as with an iphone and it works easily and well. I also own a USB-C NFC and that also works easily, except with an old ipad. You need to have at least 2 keys in case one gets lost, and I recommend that the second key be a cheaper version as you don't need a complete drop-in replacement you just need the backup key to add a replacement key. You should know that using a security key to lock down an apple account means that you lose the ability to ask Apple to unlock your account should you lose your yubikey, which can be a big deal. Other accounts are not as strict and treat the yubikeys as just another second factor. This is a complicated product and I am enjoying getting to learn about using it. Yubico has great support materials on their website and good links to external sites for various accounts and services you might use their key with. Since this version is pricey (about $25 more than the USB-C/NFC one), I would recommend only getting one of these, and then a cheaper different yubikey as a backup. The backup device is only necessary if the first gets lost, and once you replace the lost key you only need the backup on one device to do the task of adding the replacement key to all your accounts. This is a bit cumbersome but hopefully it'll get easier with time. Last thing - this key has it's keyring hole in the center, which works surprisingly well; it sits on my keychain nicely even though I worried it wouldn't. TL;DR - great product but security keys can be "dangerous" and are not for everyone. This one is pricey because it supports an edge use case (old ipads). Edit to add—I also own a USC-C NFC version of yubikey, which is similar to this product but is cheaper. I wanted to add that the lightning/USB yubikey is my favorite form factor as it is much SMALLER and I also prefer the activation mechanism of pinching it instead of touching a metal front.

I ordered two (as required for use) Multi-Factor Authentication (MFA) Security Key and password for iPhone. As I followed the instructions finalized the stronger security for my iPhone, the product was not accepted, as listed in the Amazon product when purchased. As I needed to order 2ea and they do not work, this is an Amazon + Apple failure to charge me a total of $150

I use this everyday. I take securing my online accounts seriously, username and password is insufficient, and it’s easy to use, durable, simple plug and play.

Very good

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Ich kann den Yubico YubiKey 5Ci – Multi-Faktor-Authentifizierung (MFA) Sicherheitsschlüssel wirklich jedem empfehlen, der seine Online-Konten und persönlichen Daten ernsthaft schützen möchte. In einer Zeit, in der Cyberangriffe, Phishing und Datenlecks an der Tagesordnung sind, ist dieser kleine Schlüssel ein echter Gamechanger. Der erste Eindruck: Premium-Qualität und robuste Verarbeitung. Der YubiKey 5Ci fühlt sich stabil an, liegt gut in der Hand und vermittelt sofort Vertrauen. Das Einrichten ist überraschend einfach, und sobald er einmal konfiguriert ist, läuft alles reibungslos, schnell und zuverlässig. 💡 Wichtiger Hinweis für Apple-Nutzer: Auf dem  iPhone lässt sich der YubiKey 5Ci nur einrichten, wenn man zwei Schlüssel hat. Einer dient als Hauptschlüssel, der zweite als Backup – ideal, falls man den ersten verliert oder er beschädigt wird. Meinen zweiten Schlüssel habe ich sicher aufbewahrt, sodass ich jederzeit Zugriff habe, selbst in Notfällen. Das gibt ein beruhigendes Sicherheitsgefühl, das unbezahlbar ist. Was macht den YubiKey 5Ci so besonders: Maximale Sicherheit: Unterstützt alle modernen Authentifizierungsstandards wie FIDO2, OTP und Smart Card. Ideal für E-Mail, Cloud-Dienste, soziale Netzwerke, Finanz-Accounts und Unternehmensanwendungen. Sofortige und zuverlässige Nutzung: Einfach einstecken oder auf das Gerät tippen, und die Authentifizierung erfolgt sofort – kein Warten, kein kompliziertes Setup bei jeder Anmeldung. Universelle Kompatibilität: Funktioniert auf Mac, Windows, Android und iOS (unter Beachtung der Zwei-Schlüssel-Regel). So bist du überall geschützt, egal welches Gerät du nutzt. Langfristige Investition: Ein kleiner Schlüssel, der langfristig deine digitale Sicherheit garantiert. Er ersetzt Passwörter und schützt vor Phishing und Kontoübernahmen. Für mich persönlich ist der YubiKey 5Ci mehr als nur ein Gadget – es ist ein beruhigendes Sicherheitsnetz, das ich nie mehr missen möchte. Ich fühle mich viel sicherer bei Online-Banking, Cloud-Diensten und allen sensiblen Accounts. 💯 Fazit: Wer ernsthaft seine Daten schützen möchte, sollte hier nicht sparen und sofort zugreifen. Der YubiKey 5Ci ist zuverlässig, schnell, universell einsetzbar und die beste Möglichkeit, die eigenen Konten wirklich abzusichern. Sicherheit ist kein Luxus 🔐 und mit diesem kleinen Schlüssel wird sie unglaublich einfach. 5 🌟 und eine klare Kaufempfehlung für jeden, der digitale Sicherheit ernst nimmt!

It is my first time using. Yubico key but the configuration is simple and it works with all platform’s that require multi factor authentication. It works for apple devices and usb c devices it’s small which is great for keeping with you on a keychain but I would suggest getting 2 in case one gets lost. Great product.{edited}

Artículo de gran calidad y funcionamiento muy sencillo, idóneo para la seguridad en el pc o el móvil.