Oak is among the simplest meditation apps that I’ve tried. While it’s not as stripped down as The Breathing App, it really covers all one would need for a meditation practice.

I love the aesthetics — the app has a soothing watercolor-like look to it that reminds me of a quiet, overcast morning, before the rest of the world has awoken. Navigation is very simple as there are only three basic elements to choose from: meditate, breathe and sleep. However, they’re quite enough.
Meditate offers three meditation options, all customizable in duration, instructor voice (male/female), background sounds and warm up (for those wanting to settle in before meditating). The three types of meditations are (1) Mindful, learning to focus on the breath; (2) Loving Kindness, cultivating compassion and empathy both for yourself and others; and (3) Unguided, with the choice of interval bells instead of spoken cues.

Again, very uncomplicated and accessible. Both the male and female voices have that certain “something” that makes them soothing and easy on the ears. While Oak doesn’t have the expansive meditation libraries that some apps provide, for many meditators what Oak offers will be quite enough, and the ability to customize the meditations creates far more permutations than one might expect.
Breathe is the section of this app that I personally use the most. It consists of three types of breathing exercises: (1) Deep Calm, which has been advocated by Dr. Andrew Weil and has a 4-second inhale, 7-second hold and 8-second exhale; (2) Box breathing, which is a square “box” of inhale-hold-exhale-hold, each segment being 4 seconds long; and (3) Awake, which is a 6-second inhale followed by a brief 2-second exhale.
The number of breaths per “set” for each of these exercises differs, and you are limited to the number of totals sets you can do at a given time. However, this is probably a good idea because it’s important to take breaks when doing prescribed breathing in these ways. Think of it as insurance against passing out.

Sleep offers (1) Relaxing Sounds and (2) Guided Breath. Again, there are options for the background sounds and duration. I enjoy using the sound “elevate” at work, not for sleep (!) but to offer gentle music to even out the frustrations that may complicate my day.
There is also a 10-session course on Mantra Meditation. While I was able to unlock it for free, this may be a temporary benefit (perhaps due to COVID-19?) because the App Store makes mention of the course being available for a small fee. Keep that in mind for the future.
I had not been using a mantra for meditation, but this class helped me choose one and added another dimension to my meditation practice. The narrator’s voice was perfect for this type of lesson. The class is downloadable which leaves you no excuse not to meditate on your next plane flight. Note that I haven’t completed the entire course yet, so I cannot yet comment on its benefits as a whole.
Finally, Oak tracks your progress, including minutes meditated and number of breaths taken. It also shows the number of people meditating and breathing with you. And of course, it shows you your streaks. So, if there were something that I felt I need to gripe about with this app, it would be that it encourages me to focus on streaks. I can get pretty obsessive and competitive about these things, and unfortunately, Oak doesn’t let me turn them off.
On the other hand, tracking your progress is what allows you to gather badges while developing your meditation and breathing practice, so for anyone who’s interested in seeing visual reminders of their progress, this is a plus.
All things considered, this is a lovely app that you’re not likely to outgrow quickly. With the exception of possibly being charged for the course, everything else is absolutely FREE, which evokes the spirit of mindfulness being accessible to all. It also makes it completely risk-free to download and try for yourself. While I haven’t used Oak quite as much as I have other apps, I really do enjoy it and highly recommend it.