Would be 5 ⭐️'s...
$12.99 on Amazon for the ruler and app is free. Great concept but app features are mostly in Korean and ruler measures in cm you have to convert to in(ches). This would easily be 5 star review with an English app for the fishermen in the West.
Can't wait to see the changes made in the future. Halasz is on to something most anglers are already doing, taking pictures of their catch and measuring them. They just put it all together and made an easy product to use.