Thanks to all for the useful input.
The App that I am looking at is a general health and mood tracking App which is also used in research projects.
My local surgery is intrigued, and as an IT literate expert patient I have been asked to give it the once over.
https://umotif.com/news/simple-heal...cord-their-symptoms-could-save-nhs-1bn-a-year for one of their news items. The App looks quite interesting for research trials and tracking daily/weekly symptoms where this would benefit the patient.
One of the first bits of tracking I looked at was the Diabetes segment, which recorded BG test results, carbohydrates and insulin dose but didn't mention ketones. Hence the question to see how many people tested. From the responses so far I think a record of when ketones are tested alongside the BG values etc. could be quite useful. I wonder if the HCPs even know about DKA "near misses".
As a T2 who tests occasionally but who has a PC application which saves all the test results over USB I can see little immediate value for me and I'm not sure the surgery staff have the time or inclination to look at my results on a regular basis. There seems to be scope for integration with 3rd party products including fitness wearables and cycling/exercise sites such as Strava but nothing obvious for BG meters. Anything is possible given a strong enough justification.
However there does seem to be scope to configure/modify it to record key metrics form T1s and T2s to form a health log where you can record what you eat, what you weigh, how you feel, what you drink, what your BG level is, how much exercise you take......for someone to analyse over a large number of patients to see if there are obvious correlations. This does of course require a motivated set of patients.
I haven't yet found if the patient can analyse the results.
This would be far more useful to me.
I still keenly feel the loss of the excellent analytic tools which came bundled with EMIS now that the surgery has (reluctantly) moved over to Systemonline which seems to have far less investment in front end tools to assist the patient in tracking their health.