[…] Forks which only re-brand an app but do not add value for users might not get accepted.
Since I basically just want to change the color theme and update the target sdk version, I was worried that my edits would not be accepted.
Will I be ok even if the changes to the original app are very very little ?
Why do you still like that old app and the currently developed ones
Eh, I tried many of them, but I just feel very comfortable with this one.
The navigation and the reminders just work very well for me.
If I understood correctly, here’s what I have to do:
the original app was last updated 2015 if I understand correctly, so it’s most likely abandoned. So firt point on the pro site (“+1”): the fork will be (more recently) maintained. If you plan to keep it maintained (no promises, one never knows how life proceeds), even +2 to that (including the vote of @Baggypants).
the app still works (±0), but who knows a) how long and b) due to its targetSDK, on which devices? Which makes an updated fork another +1 to me.
“I basically just want to change the color theme and update the target sdk version” (+0.5 for the targetSDK if it includes testing that it won’t break something in the app): the term “basically” implies you might have more things in mind. And once you’ve started on it, might continue. So rounding this up to a +1
“I just feel very comfortable with this one”: another +1 IMHO. This kind of diversity can be a good thing.
If my math didn’t leave me, this makes a clear “5 stars”, doesn’t it?
Please inform the original developer. If there’s no response – well, can’t be helped. But at least nobody can complain you didn’t even try. But I’d say go for it. Include credits also in the app description (along the lines of “this is a continuation of the (unfortunately no longer maintained) XXX …”), which might even give existing users an incentive to take a look and potentially switch over).
Instead of making a fork, why don’t you just try to convince the current developer to give you access to the repo? Maintaining the original is almost always better than starting a fork, because it keeps the name and user base. @spacecowboy is quite active on GitHub, and even registered on the forum here - I’m pretty sure they will reply if you ask them