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Tried several similar apps and this is, without a doubt, the most complete. It may be expensive but its of great value. But nothing is perfect... to have the full experience you must buy extra add-ons, which I pay willingly, but if you're short of cash, the main app is sufficient, buy them depending on your needs. Besides you need a powerful phone for it to run smoothly (Im running it on a galaxy s10). Congratulations to the developers for such a great app. A++, an instant favorite.
Great app overall. I use it almost every day. One thing to improve may be the undo function, as the current setup is cumbersome when dissecting the models. As a neuroscientist, I would appreciate some more detail in the neuroanatomy (a dedicated neuro version would be great if the developers want another project).