In order to help you make a decision about which version of 27 crags most suits your needs, here is a quick list of the features of each:
Free version of 27 Crags
Here is a list of the things you can do with the basic free version of 27 Crags:
Register
Download the app
Track your ticks and to-do's
Create free and Premium topos
Follow your friends
Share your photos
Use Free topos
Access limited information in Premium topos (location, description and access)
Bonus Premium features
In addition to the things that are possible with the free version of 27 Crags, here is a list of additional features that you will have access to with a Premium membership:
Unlimited access to all Premium topo info including images with detailed route overlays
Offline use
The ability to give content suggestions to Premium topos made by others.