We work on a SaaS app (company has market leadership in our specific business which is payroll calculation of a western european country), which would strongly benefit from integrating a time-tracking app of some sort. Currently we are in a limited customer trial phase, doing market research and finishing our planned feature set for initial public release.

As a part of the MVP and customer research phase, and mostly because it is quite relevant to our intended customer base, we did some market research by talking to potential customers regarding the use of time tracking software.

We got feedback that most potential customers looked at using time-tracking software but almost all of them did not find suitable tools because of lacking integration to other software.

Time tracking itself appears to be quite worthless as long as it does not have export functionality (in a commonly used format) or integration.

Just my humble opinion based on our research, may or may not be of any interest for you :)