So you will have food to eat long-term or even in a pinch.
Try the free version first: (Apple Google.) It has ads and only allows 10 photos per day. But most people either hate or love this app. And paying for the pro version does not make it work better. You just get unlimited photos and no ads. PlantSnap Pro costs $14.99 in the Apple store and $19.99 in the Google Play store. I believe this is a yearly subscription amount.
Also note that many features of the app require you to sign up with your name and email address. This is optional and not needed to identify plants.
I highly suggest you start learning about plants in your area you could eat in an emergency. First find out what a plant might be. Then learn more to make 100% sure it’s safe.
But even with safe plants, your body might need to adjust to it. So why not get used to eating some of this kind of food now, rather than in an emergency?
Otherwise, you may have to depend on the anti-diarrheal or constipation meds in your first aid kit.
If you wait until an emergency, plan on being really, really hungry. You see, there are other edible plant guide apps that work without an internet connection.
Wild Plant Survival Guide ($1.99), for example, is just a repeat of the info in the Army Survival Skills app. More than a hundred possible plants. More than a dozen of them listed as edible.
Edible Plant Guide ($2.99) has a longer list. So plan on sorting through thousands of possible plants.
And then there’s the fear as you put something not 100% known into your mouth… even if you have a thorough guide like Army Survival Skills “Plant Edibility Testing” to help.