Good Idea But Do Not Purchase
1. The Differences section repeatedly fails to register when you tap to note a Difference. This has been raised in numerous previous comments and has not been corrected.
2. All sections do not consistently record progress. Sometimes you get a “you have increased your progress” note and after completing an exercise successfully and sometimes you do not. Also, the Echoes section sometimes notes progress if you assess yourself as “yellow” but sometimes does not.
3. I have found it impossible to complete any exercise because, after a number of attempts, the app simply stops recording progress. No matter how many more examples you complete, it no longer gives an “an increased progress message” and leaves your progress on the summary at c. 66% completion.
The app is not free and you will not get a refund if you buy it. Therefore, since these things means it does not fulfil its function, you should not purchase until you see comments that show they have been sorted out.