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UI = User Interface UX = User eXperience Most open source apps offer out-dated or classic material design UI. If the apps works great and the UX is not terrible you might find it okay. But intuitive UI are better, and modern looking ones are pleasant to use, sadly they are not the majority. Here is my list of Beautiful Open Source Apps for your android device ! Apps are listed in alphabetical order ! Also look at : The ultimate F-Droid setup for more open source android apps. and Beautiful Open Source Apps for iOS for your iOS device DISCLAIMERS Nice UI comes to personnal preference. So this list is only based on my taste of what is a good modern looking app. While open source is great for privacy and security it is not perfect. So keep that in mind before downloading any apps. I again encourage you to do your own research about them and read their Privacy Policies. I am not a privacy and security expert. I'm also don't consider myself as a developper so I do not have any technical knowledge and so I didn't look into any source code of any apps in this list !

Everytime I setup a phone for a friend or myself I usually remove stock apps using adb or UniversalAndroidDebloaterNextGeneration and replace them with theses apps listed here. I added also a couple of nice to have apps that people might wants on their device. Almost all of them are free as in free beer and many are open source (around 80%) I tried to feature more applications and less services but there are several services still in this list, however I find them great and/or accessible (freemium most of the time). FOSS = Free(as in freedom) and Open Source Software

When migrating from iOS to Android, users often need to replace Apple's default app. Google options, while they are offering great UI/UX are usually privacy invasive in a more aggressive manner than Apple ones. And manufeturer ones like Samsung, Xiaomi or others can feel bloated with ads or also privacy invasive. On this list you will get basic apps that either provide a similar UI/UX that would makes Apple users familiar with quicker than other options. Some might not have that Apple inspired look but still have great UX, strong enough privacy for most people and might be one of the best option to recommand to an ex-iPhone user.