Unfortunately even tea is too caffeine intense for me so I've been sticking to decaffeinated coffee. A factoid, the color of a tea does not relate to its caffeine content.
There is still a world of tea for people that are caffeine sensitive. I find a lot of jasmine teas are light on caffeine, cha hua is tea made from the flowers of the tea plant and that is barely caffeinated and if that is still too much there is always rooibos, honeybush, and other herbals.
Came here to put in a good word for rooibos. When I went through a caffeine-free phase for several years, it was my go to drink. It also makes fantastic iced tea.
> A factoid, the color of a tea does not relate to its caffeine content.
While it is not exclusively true, there is a pattern. You do have a general rule of thumb that black > green > white. These, of course, assume you follow the "proper" steeping times and water temperatures. Your caffeine content will vary with both these factors. The longer and hotter, the more caffeine.
If you want a low caffeine test I would take green or white tea and blanch it with hot water. Then make the tea. Or alternatively throw the first steep away and drink the second one.
You can buy loose leaf tea and brew your own concentration. I brew about 1/4th of a gram per liter which is... probably imperceptible to most (which probably brew about 4 grams per liter)
Decaffeinated coffee has 2-20% of the original caffeine. Tea appears to be around 18% percent, but many teas starts out with lower caffeine anyway. https://en.wikipedia.org/wiki/Decaffeination