Overview
UnifyID developed software that used behavioral and environmental signals to help authenticate people. Its products included mobile motion analysis, such as recognizing a person's walking pattern, and tools for adding authentication to existing apps.[1][2]
Prove announced plans to acquire UnifyID in June 2021. Investor NEA later lists the company as acquired by Prove; the exact closing day and price are not established in the sources reviewed.[1][3]
Founding Story
John Whaley and Kurt Somerville founded UnifyID. The company emerged from the Stanford StartX ecosystem in 2015 and presented its early product at TechCrunch Disrupt in 2016. Its premise was that an identity system could use signals already generated by a user's devices instead of asking for a password at every interaction.[4][5]
The idea also raised a privacy question: behavior and movement data are personal, and a user must understand what is collected and how it is used. A behavioral signal can be unavailable or wrong, so a real system needs a fallback and a way to handle uncertainty.
Timeline
- 2015–2016: The company forms and presents an early authentication product.[4][5]
- 2017: UnifyID raises a $20 million Series A led by NEA. TechCrunch reports participation by a16z and other earlier investors.[2]
- 2020: The company announces GaitAuth, a mobile gait-based authentication product.[6]
- 2021: Prove announces an agreement to acquire UnifyID; later sources identify the acquisition as completed.[1][3]
What They Built
UnifyID initially presented a consumer browser extension and phone app. By 2017 it had shifted toward a software development kit and back-end service that businesses could add to their existing mobile apps. A business could use the signals as part of its own authentication flow rather than asking customers to adopt a separate product.[2]
GaitAuth used motion sensors in a phone to measure how a person walks. The system compared motion patterns with an enrolled profile to help determine whether the expected person was using the device. Other products included push authentication and contextual signals. These measurements are probabilistic: a person may carry a phone differently, stop walking, or be incorrectly matched.[1][7]
The company and acquirer made accuracy claims, but the reviewed sources do not provide enough independent, comparable testing to establish performance across users, devices, and conditions. A biometric signal should be assessed alongside recovery, consent, security, and alternatives for people who cannot supply it.
Market Position
Target Customers
UnifyID sold to businesses with existing mobile applications, including organizations interested in stronger or less intrusive authentication. In 2017, TechCrunch reported ten business partners working with its development kit. That early figure does not establish long-term adoption or revenue.[2]
Market Size
The available sources do not establish a reliable market size for UnifyID's specific behavioral authentication product.
Competition
Passwords, one-time codes, device-based authentication, and other biometric products all served parts of the same identity problem. Prove continues to sell phone-based identity and authentication products, so the category has an active successor.[8]
Business Model
Somerville told TechCrunch that the business planned to sell its software development kit and back-end platform to companies with existing apps and charge per API call. The reviewed sources do not establish prices, gross margin, or retention.[2]
Traction
The company announced $23.4 million in total financing after its 2017 Series A. The company announcement identifies a16z as a prior seed investor; contemporary TechCrunch reporting also says it participated in the Series A. Funding does not establish commercial performance.[9][2]
Outcome and evolution
Behavioral signals joined a phone identity platform
Prove said it intended to combine UnifyID's motion-based and push authentication with its existing phone identity services. Its June 2021 announcement described a proposed acquisition expected to close shortly afterward. NEA later identified UnifyID as acquired by Prove, although the reviewed evidence does not establish the exact close date or consideration.[1][3]
Prove subsequently described gait authentication as part of its behavioral biometrics offering. Its current site describes phone-based identity and authentication more broadly. The sources do not establish that every standalone UnifyID feature remains available today.[10][8]
Key Lessons
- Fit existing applications. UnifyID shifted from a consumer product to tools that businesses could integrate into their apps.
- Use behavior as a signal. Motion data can contribute to an authentication decision, but it is not a guarantee of identity.
- Design for missing or wrong signals. Users need recovery paths when devices, behavior, or conditions change.
- Make privacy part of the product. Continuous behavioral data requires clear consent, access controls, and retention choices.