I'm on an annual plan from another app (Calory, $30) otherwise I would have bit.
It gives some features with a totally free plan. That makes the IaP feel less like a bait and switch.
The proposition of SnapCalorie is compelling. Calory ui is decent and I use a scale so accuracy should be good but I think their database is shitty. Meatloaf will vary from 1.5 kcal/g to 3, steak will show as 1 kcal/g, stuff like that.
You can start a 7 day free trial and cancel immediately. There is also a freemium tier at the end if you don't end up converting. We don't normally advertise this because we've been struggling to handle the load and costs of new users, but hopefully as we scale up we'll be able to support a free tier for everyone!