Not a bad effort.

From a scientific point of view this app seems to be one of the better ones out there. No surprise that PolyScience uses a copy of this instead of writing their own. This one version is better as I have a Nomiku.
One suggestion though: Rather than having to set everything up from scratch each time you use the app it would be far more friendly for you to be able to save basic combinations so that you can quickly recall them or edit then after youve cooked them and want to tweak. Obviously not every setting can be saved as thickness may change each time you cook. But the majority of settings can be saved and recalled. This should be done in iCloud and synced between devices.
Other than the above, this app is one of the better ones out there so highly recommended for all levels of sous vide chef.

Jordan Millar about SousVide Dash, v4.0