Thinkie is to support data capture for thinking-aloud on iPhone and iPad. Especially during field work a researcher is better off on mobiles.

The current version is the 3rd one since 2013, trying to achieve better usability and keeping pace with the technical development.

For thinking-aloud one records a person talking while dealing with a problem. This yields concurrent verbal protocols of a person’s thinking work. Often it is useful to record a video in parallel. Most often the spoken verbal protocol is transcribed in order to interpret and categorize it.

The description of how the person succeeds with a task is good for showing the cognitive processing. If a user encounters avoidable problems with a device or interface, one would try to offer a better version. This is the case of usability engineering, human computer interaction (HCI) or user experience design (UX).

At https://www.noapps.org/papers/ThinikngAloud.PDF you find an English storyboard-style user guide. For German see https://www.noapps.org/papers/LautesDenken.PDF.
On privacy please see https://www.noapps.org/PrivacyPhone.html .

The version 1.1 on IOS 14.5 includes an explicit Apple ID authorization.

Thinkie 3.0 was tested with an iPhone XS and an iPad Air 2.