Flora is one of several apps that rewards you for not interacting with your phone for an amount of time that you specify. There's a wide range of these available now, with slightly different features in each one.

What makes this a "green" app is the fact that the iOS version allows users to fund the planting of real trees. This can be done either as a "Price" (if you kill your virtual tree, you must pay money) or as "Care" (planting virtual trees successfully funds the real ones). This is planned to be added for Android, but isn't there yet.

So at that point, the question is, which of these slightly different apps has the features you want and need? Which ones measure and reward time and tasks in a way that works for you? Do you need the focus app to be just a gamified kitchen timer, or do you want it integrated with other functions like a to-do list?

Points in favor of Flora:

• No ads or nagging to pay--none at all, at least in the Android version. It does have a few expansion packs of extra trees that can be paid for as one-time purchases, but these aren't waved in the user's face; you have to find them by trying to switch which "tour" you're on.
• Trees are unlocked via a "world tour" that provides fun facts about real plant life in real places. At least, mostly real; the UK's tour includes the iconic-but-fictitious Tudor Rose.
• The app provides a Guest mode, so that you can try it out without signing in right away.

Quirks which may be good or bad, depending on your needs:

• By default, plants are chosen semi-randomly from the pool you have unlocked, and only revealed once a focus session is complete. If you enjoy the chaos, this gives a good variety without having to put in effort. If you want more control, you're signing up for many extra taps per focus session.
• Once the timer for a focus session has run its course, it starts counting up again to add more time, for which you will also be rewarded. This allows for finishing a job that "just needed a few more minutes" but may not work well if you're trying to keep to strict Pomodoro intervals.
• Flora also allows for ending a session early, if you do so deliberately. This is either a welcome flexibility, or may allow for too much lack of discipline.
• A To-Do list is included, though its implementation is a little odd. More on that below.
• The art style is more painting-like than many apps, which is a refreshing change--though there is some AI use involved with making it, which they describe in their FAQ.

Points against Flora:

• Trees and other plants are only revealed when unlocked, after which point, if there are any you don't like, you have to put forth some effort to keep them out of your garden by specifically choosing other plants every time. (You could sacrifice the element of surprise by looking them up ahead of time.)
• There is no way to mark a tree as a favorite or remove it from the random-selection pool.
• Every focus session asks for some kind of label. The only way to shortcut setting these is by using Focus Goals, however...
• If a task is set with a Focus Goal, it must have some daily, weekly, or monthly amount of time or number of sessions that should be spent on it. There is no way to set a repeatable task without this overarching goal, and the task will disappear from the list after its goal has been reached for the interval.
• Additionally, even if a task with a goal is used, the time to spend on it for this session must always be manually entered. There's no good way to just have one button to spend the next 20 minutes on "chores" at whatever random time presents itself.

Flora has no ads even in free mode, and no nagging to upgrade. In that sense, it is a rare gem of an app that could use more love. If it had the kinds of easily-invoked standalone "favorite" planting options that Forest does, I'd be very happy with it. The ability to remove unwanted trees from the pool would be nice too. Other, dedicated to-do apps are probably better to use for actual task lists (Todois and Habitica are both good in their own ways)--I prefer using an app like Flora as just a timer.