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1Password

1Password is a cross-platform password manager application that enables users to securely generate, store, retrieve, and share sensitive information such as passwords, passkeys, credit card details, secure notes, and two-factor authentication codes across personal devices and accounts. Developed by AgileBits Inc., a software company founded in 2005 by Dave Teare, Sara Teare, Roustem Karimov, and Natalia Karimov in Toronto, Ontario, Canada, 1Password began as a side project to address the challenges of managing complex passwords in an increasingly digital world. The software employs a zero-knowledge architecture with end-to-end encryption using AES-256 and a unique dual-key system—combining the user's master password and a 128-bit Secret Key—to ensure that only the account holder can access their data, while the company cannot decrypt or view it. It supports major operating systems including macOS (version 12 or later), Windows (10 or later, with native passkey support in Windows 11 following the November 2025 security update), Linux (64-bit x86/ARM with glibc 2.31 or later, e.g., Ubuntu 20.04 LTS, via command-line tools and browser extensions), iOS (17.5 or later), and Android (9 or later), along with browser extensions for Chrome, Firefox, Edge, Safari, and Brave. Key features include automatic password generation, autofill capabilities, breach monitoring via Watchtower, secure sharing for families and teams, and integration with biometric authentication like Touch ID and Windows Hello. As of 2025, 1Password serves millions of individual users and over 180,000 businesses globally, positioning it as a leader in extended access management solutions that extend beyond traditional password storage to include device trust verification and application access controls.

Overview

Company Background

1Password was founded in 2005 in Ottawa, Canada, by Dave Teare and Roustem Karimov as a weekend project aimed at simplifying password management for their web development work. The initiative quickly evolved into the core product of AgileBits Inc., the original company name, with additional co-founders including Sara Teare and Natalia Karimov contributing to its early development. In recent years, AgileBits rebranded to 1Password to better align its corporate identity with the flagship product, culminating in a refreshed brand identity launched in 2023. Sara Teare, a co-founder, has played a pivotal role in shaping the company's customer-focused strategy. Key growth milestones include a 2019 partnership with Accel, which provided $200 million in Series A funding to accelerate enterprise expansion after 14 years of bootstrapping. In 2024, the company launched Extended Access Management, extending its security offerings beyond traditional password management. As of November 2025, the company reported over $400 million in annual recurring revenue and a valuation of $6.8 billion USD. In December 2025, 1Password was awarded a 2025 AWS Partner Award, recognizing its leadership in Geography and Global categories. 1Password remains privately held, with over 1,300 employees, and maintains a strong emphasis on zero-knowledge security architecture to protect data for both individual and enterprise users.

Product Description

1Password is a cross-platform password manager that generates, stores, and autofills secure credentials for websites, apps, and services across devices including macOS, Windows, iOS, Android, and Linux. It enables users to create strong, unique passwords automatically while providing seamless autofill capabilities to streamline logins without compromising security. The product supports personal, family, and business plans starting at $2.39 per month (billed annually) as of November 2025, with all tiers offering unlimited devices and storage for passwords, documents, and other sensitive data. These plans cater to individuals seeking basic protection, families sharing secure access, and organizations requiring scalable access management. Key benefits include reducing password reuse risks through password generation and storage, which helps prevent credential stuffing and other common breaches. 1Password supports passkeys and biometric authentication, such as Face ID or Touch ID, for phishing-resistant logins that enhance both security and user convenience. It also integrates with identity providers to enable extended access management, allowing secure provisioning and monitoring of app access in enterprise environments. 1Password serves millions of users globally, including individuals and enterprises like IBM, Slack, and Dropbox. The service secures over 1.3 billion credentials for more than 180,000 business clients, representing nearly a third of Fortune 100 companies. Built on end-to-end encryption, it ensures that user data remains protected even from the service provider itself.

Features

Password Management

1Password includes a built-in password generator that creates strong, unique passwords by combining uppercase and lowercase letters, numbers, and special characters. Users can customize the generation process, specifying password length up to 100 characters and character types. This tool suggests secure credentials during account creation or updates, promoting the use of random, complex passwords resistant to cracking. Passwords and other sensitive data are stored in vault-based structures, allowing users to organize information into dedicated spaces. Common categories include Login for website credentials, Secure Note for text-based information, Credit Card for payment details, and Identity for personal data like addresses. Additional categories support specialized items such as API Credential, Bank Account, and Crypto Wallet. Vaults accommodate attachments like documents and images, with individual files up to 2 GB in size. Along with passwords, 1Password also allows users to save passkeys to their vaults and sync them across multiple devices. Organization is enhanced through custom fields, tags, folders, and comprehensive search capabilities. Custom fields enable users to add specific details, such as security questions, PINs, or multiple contact numbers, to any item. Tags allow flexible labeling and grouping of items for quick retrieval, with multiple tags applicable per item, while folders provide hierarchical structuring within vaults. The search function, including Quick Access, enables instant querying across all vaults and items on all platforms. Autofill features facilitate seamless entry of stored data into forms on websites and applications. On desktop, Universal Autofill extends beyond browsers to system prompts and apps without requiring full page loads. For iOS and Android, Autofill integrates with device systems to suggest and insert logins, passkeys, and other details directly in apps and browsers. This capability ensures compatibility across platforms while maintaining security by verifying site legitimacy before filling.

Security and Privacy Tools

1Password incorporates several built-in tools designed to monitor and enhance the security of stored credentials while prioritizing user privacy. These features operate on top of the application's end-to-end encryption model, which ensures data remains protected throughout its lifecycle. Watchtower is a proactive monitoring service that scans user vaults for potential vulnerabilities. It identifies weak passwords that are easily guessable, detects reused passwords across multiple accounts, and flags compromised credentials exposed in known data breaches. By integrating with the Have I Been Pwned service, Watchtower checks against a database of breached websites and alerts users if their email or passwords appear in public leaks. Additionally, it tracks passkey adoption by identifying websites that support passkeys and prompting users to save and use them for stronger authentication. For two-factor authentication (2FA), 1Password serves as a secure authenticator, storing and autofilling time-based one-time passwords (TOTP) directly within login items. Users can add TOTP codes by scanning QR codes or entering setup keys manually, and the app generates codes on demand while autofilling them alongside usernames and passwords on supported sites. This integration works across browser extensions, mobile apps, and the web interface, with options to auto-copy codes to the clipboard for manual entry if needed. All 2FA data is encrypted within the user's vault, maintaining the same security level as other stored information. Privacy is reinforced through 1Password's zero-knowledge architecture, where encryption keys derived from the user's account password and Secret Key are generated and used solely on the user's device—ensuring the company has no access to unencrypted data, even in the event of a server compromise. Complementing this, Travel Mode allows users to temporarily hide selected vaults from their devices, removing sensitive information during travel to mitigate risks from border inspections or device searches; vaults can be restored upon deactivation using the master password. In response to detected breaches, Watchtower facilitates rapid remediation by providing in-app prompts to generate and update compromised passwords directly. For shared environments like families or teams, organizers receive alerts through dedicated reports, such as the Domain Breach Report, which notifies admins of exposed email addresses in public incidents, and the Business Watchtower Report, which highlights vulnerabilities in shared credentials, including missing 2FA or expired items, enabling coordinated fixes.

Sharing and Collaboration

1Password supports secure sharing of passwords and other items with family members, team members, or guests. Users can grant access to entire vaults, with customizable permissions including view-only, edit, or administrative roles to control what others can do. Individual items can be shared via one-time or expiring secure links, allowing temporary access without requiring the recipient to have a 1Password account. For teams and businesses, shared vaults facilitate collaboration by organizing credentials and enabling admins to manage access and monitor usage, ensuring compliance and security.

Technical Implementation

Encryption and Architecture

1Password employs a zero-knowledge architecture, ensuring that all data stored on its servers is encrypted using keys derived exclusively from the user's credentials, rendering the information inaccessible to 1Password employees or any third party without those credentials. In this model, the company operates without the ability to decrypt user vaults, as encryption occurs entirely on the client side before data transmission, and only ciphertext is uploaded to the cloud. This design protects against server breaches, where even if an attacker gains access to the infrastructure, the lack of decryption keys prevents data exposure. The encryption standards utilized by 1Password include AES-256 in Galois/Counter Mode (GCM) for authenticated encryption of data at rest, providing robust protection against tampering and unauthorized access. For key derivation from the user's account password, 1Password applies PBKDF2-HMAC-SHA256 with 650,000 iterations, incorporating a unique salt to thwart brute-force attacks by significantly increasing the computational cost of password guessing. This process generates a 256-bit key locally on the user's device, which is then combined with the Secret Key through a two-secret key derivation mechanism involving HKDF for additional entropy. All data transmissions are secured via end-to-end encryption using the same AES-256-GCM protocol, ensuring that information remains protected throughout its lifecycle from client to server and back. Central to the system is the Secret Key, a 128-bit unique identifier generated randomly on the user's device during account setup, formatted as a 34-character string for readability. This key, which adds substantial entropy to the encryption process, is never transmitted to or stored on 1Password's servers; instead, it resides solely on the user's devices, in their Emergency Kit, or in encrypted backups. Access to vaults requires both the Secret Key and the account password, as they are combined client-side to derive the Account Unlock Key (AUK), which in turn encrypts vault-specific keys—preventing standalone use of either component for decryption and enhancing overall security against credential compromise. The overall architecture emphasizes client-side processing for all cryptographic operations, with encryption and decryption handled exclusively on user devices to maintain the zero-knowledge principle. Vault items are encrypted with per-vault symmetric keys, which are themselves wrapped by the AUK before any server interaction, ensuring that no plaintext data ever leaves the local environment. On supported platforms such as iOS, macOS, and Android, 1Password leverages hardware secure enclaves—like the Secure Enclave on Apple devices or Trusted Execution Environments on Android—to safeguard biometric authentication keys, allowing quick unlocks via Touch ID, Face ID, or fingerprint without exposing the master credentials. This integration with device-level hardware security modules further isolates sensitive operations from the host operating system, bolstering resilience against malware or physical attacks.

Synchronization Mechanism

1Password employs a cloud-based synchronization mechanism to maintain data consistency across devices for users with a membership account. Changes made on one device are instantly propagated to all others via 1Password's servers, ensuring real-time updates without manual intervention. This process supports all platforms, including macOS, Windows, iOS, Android, Linux, and browser extensions, with no device limits. Local caching enables offline access, allowing users to view and edit data without an internet connection until syncing resumes upon reconnection. Prior to version 8, released in 2021, 1Password relied on legacy file-based synchronization for standalone vaults, using third-party services such as Dropbox, iCloud, or OneDrive to share encrypted vault files across devices. With the shift to a subscription model in version 8, file sync was deprecated in favor of exclusive cloud synchronization through 1Password accounts, requiring users to migrate existing data. During migration from version 7, potential conflicts result in duplicate items tagged for manual review and resolution by the user. In the cloud sync model, end-to-end encryption protects data during transit and storage on 1Password servers, with vault keys generated client-side and secured using AES-256. Automatic merging handles most changes seamlessly, though rare conflicts may prompt user intervention to preserve data integrity. For performance, the system optimizes bandwidth by syncing only incremental changes in real-time, minimizing data transfer while supporting low-latency updates across devices. Enterprise deployments offer on-premises options through the 1Password Connect server, which runs a dedicated sync container to pull encrypted data from 1Password's cloud, enabling hybrid synchronization in controlled environments.

Integrations and Extensions

1Password offers browser extensions for major web browsers, including Google Chrome, Mozilla Firefox, Microsoft Edge, Brave, and Apple Safari, enabling seamless integration for password management tasks. These extensions support automatic filling of login credentials on websites, capture of new passwords during sign-up processes, and access to context menus for quick actions such as generating secure passwords or viewing saved items directly from the browser toolbar. The service provides native applications across multiple platforms, including macOS, Windows, Linux, iOS, and Android, allowing users to access their vaults and manage credentials consistently on desktop and mobile devices. For developers, 1Password includes a command-line interface (CLI) tool that facilitates automation of tasks like retrieving secrets and authenticating with biometrics, as well as a REST API through the 1Password Connect server for integrating secrets into custom workflows and cloud infrastructure. 1Password supports integration with third-party identity providers for single sign-on (SSO), such as Okta, Microsoft Entra ID (formerly Azure AD), and Duo, enabling users to unlock their vaults using existing enterprise credentials via the OpenID Connect protocol. Additionally, it is compatible with passwordless authentication standards like WebAuthn through its passkey functionality, which allows secure, phishing-resistant sign-ins using device-bound cryptographic keys. For business environments, 1Password incorporates tools like SCIM provisioning to automate user and group management with identity providers, ensuring synchronized access controls across organizations. It also provides detailed audit logs to track user activity and access events, supporting compliance and security monitoring. Within its Extended Access Management platform, 1Password offers connectors for legacy applications, enabling secure credential management and policy enforcement for unfederated and shadow IT systems without requiring full modernization.

History

Founding and Early Development

1Password was founded in 2005 as AgileBits Inc. in Ottawa, Canada, by co-founders Dave Teare, Sara Teare, Roustem Karimov, and Natalia Karimov. It originated as a side project to simplify password management and automate web form filling for their web development work. After quitting their day jobs, the founders developed the first beta, and on May 19, 2006, released the initial version of Password Manager for Mac (later renamed 1Password) via MacUpdate and VersionTracker. In its early years, 1Password focused on the Mac platform and grew organically without external funding. By 2012, Jeff Shiner joined as CEO to support expansion as the team grew from 20 to over 160 employees by 2019.

Major Releases and Expansions

1Password expanded to additional platforms starting in 2010 with releases for iOS and Windows. In 2015, it launched 1Password for Teams, enabling secure sharing for small groups. The following year, 2016, introduced 1Password Memberships, a subscription-based model for individual and family use. In 2018, 1Password Business was released, targeting enterprise needs with advanced administrative controls. A major architectural update came with 1Password 8 in 2021, unifying the app experience across platforms. That year, the company acquired SecretHub and launched Secrets Automation for developers. In November 2019, after 14 years of bootstrapping, 1Password secured its first external funding: a $200 million Series A led by Accel. This was followed by a $620 million Series C in January 2022, valuing the company at $6.8 billion. Further expansions included the acquisition of Passage in November 2022 for passwordless authentication and reaching $250 million in annual recurring revenue by September 2023. In 2024, 1Password launched Extended Access Management and acquired Kolide for device compliance. As of 2025, it acquired Trelica in January for access governance and partnered with Red Bull Racing as a cybersecurity sponsor in February.

Reception and Security

Critical Reviews and Awards

1Password has received widespread acclaim from technology reviewers for its robust security features and user-friendly design. In a 2025 review, WIRED described it as the "gold standard" for password management, praising its long-standing innovation in protecting user logins despite being a decades-old service. PCMag awarded it a 4.0 out of 5 rating in February 2025, highlighting its reliable performance and value at $2.99 per month for individual plans, making it a solid choice for basic yet effective password handling. Similarly, Cybernews rated it 4.8 out of 5, commending its balance of security and usability in a competitive field. User feedback echoes these professional assessments, with consistent praise for the intuitive interface and tools like Watchtower, which alerts users to potential vulnerabilities such as weak passwords or data breaches. On Capterra, 1Password holds a 4.7 out of 5 rating based on over 2,000 reviews as of 2025, where users frequently note its ease of autofill and secure storage capabilities. However, some criticisms include the higher cost for family plans and occasional synchronization issues across devices, though these are often outweighed by its overall reliability. The product has garnered several prestigious awards recognizing its impact in the cybersecurity space. In 2025, 1Password was named to the Forbes Cloud 100 list for the fourth consecutive year, ranking at #39 among top private cloud companies for its leadership in extended access management. It also earned Editor's Choice designations in multiple password manager roundups from outlets like PCMag and WIRED, affirming its excellence in the category. Additionally, 1Password received a 4.6 out of 5 rating on G2 based on 1,532 reviews as of 2025, reflecting high user satisfaction and market presence. These accolades underscore 1Password's role in addressing modern security challenges, as highlighted in its 2025 Annual Report, which surveyed over 5,000 professionals and found that 74% of IT and security experts consider single sign-on (SSO) insufficient for securing identities, positioning 1Password's comprehensive approach as a key solution for bridging access-trust gaps in an era of shadow IT and AI proliferation.

Known Incidents and Audits

In October 2023, 1Password disclosed an incident stemming from a breach in Okta's support system, which allowed unauthorized access to 1Password's Okta tenant on September 29, 2023. Attackers viewed a list of admin console users but were unable to escalate privileges or access any employee-facing applications, user vaults, or sensitive data; the activity was terminated immediately upon detection, with no evidence of data compromise. This event was part of a broader Okta support case management breach affecting multiple organizations, but 1Password's zero-knowledge architecture ensured no user information was exposed. In 2025, 1Password users faced phishing campaigns, including a March attempt using fake "Action Required: Reset your password" emails warning of security issues, and an October campaign with convincing fake breach alerts to steal vault logins. These were external attacks not involving compromise of 1Password's systems, and the company issued warnings and user education to mitigate risks. No user data was compromised in these incidents. Beyond the Okta incident, 1Password has experienced no direct breaches of its encrypted vaults, with all reported security events limited to vulnerabilities in client-side components that were promptly patched without known exploitation. For instance, in August 2024, 1Password addressed six vulnerabilities in its macOS application through updates in July and August 2024, including CVE-2024-42219 (fixed in version 8.10.36), which could allow local malware to bypass inter-process communication and access browser data on affected versions prior to 8.10.36, and CVE-2024-42218 (fixed in version 8.10.38), related to missing biometric enforcement on versions prior to 8.10.38; these issues required an already-compromised device and did not result in any real-world data theft. Earlier CVEs, such as those in browser extensions involving insecure connection methods, were resolved through updates before 2023, maintaining the integrity of core vault encryption. 1Password undergoes regular third-party security validations to affirm its robustness, including penetration tests and code audits by Cure53, such as the 2021 assessment of its core codebase and the 2022 review of mobile applications, which identified and led to fixes for minor issues without uncovering systemic flaws. The company holds SOC 2 Type 2 compliance, audited annually to verify controls for security, availability, processing integrity, confidentiality, and privacy. Additionally, since 2017, 1Password has operated a transparent bug bounty program via platforms like Bugcrowd and HackerOne, rewarding researchers for vulnerabilities with payouts totaling over $103,000 by 2022 and a maximum reward escalated to $1 million for critical findings like vault decryption exploits. In response to incidents, 1Password prioritizes immediate public disclosure and collaboration with affected parties, as demonstrated in the Okta case where full details were shared within days; this approach, combined with its zero-knowledge model, has prevented any history of user data leaks across all events.

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