They measure different things, which is why you can hit one and completely miss the other.
5 a day counts portions of fruit and vegetables. It's about amount.
30 plants a week counts types. Five apples is one plant. It's about variety. It also casts a wider net, because whole grains, nuts, seeds, herbs and spices all count, and those mostly don't feature in 5 a day.
A quick example
Monday: porridge with a banana, a cheese and tomato sandwich, then spaghetti with a tomato, onion and garlic sauce.
By portions that's roughly three. By plant count it's oats, banana, wheat, tomato, onion and garlic. Six plants. Eat that menu every day and you're still on six on Sunday night.
That's what the weekly count makes visible. A week can look fine by portions and still be very samey.
Use both if you like
They aren't rivals. Some people treat 5 a day as the daily habit and the plant count as the weekly variety check.
Eating30 only does the second job. There are no portions, grams or calories in it, just a count of how many different plants you've had since your week started, and which colours they were.
Eating30 is an app for iPhone and Android that counts the different plants you eat each week, with 30 as the target. The core tracking is free. It's a habit tracker, not medical advice.
Count your plants with Eating30
Tap the plants you eat and watch your week fill up towards 30.