Is there any differences between nRf51822 and nRF51922?

[aaronxu]

I noticed that nRF51922 has been public. It looks like the same with nRF51822 in hardware.

[Ole Morten]

The nRF51922 have a preprogrammed softdevice, which is not available for the nRF51822. If you need ANT, you should use the nRF51922, but if you don't you should most definitely use the nRF51822.

With the nRF51822 you can also upgrade the softdevice on the chip, potentially enabling new features or support new roles. The nRF51822 must therefore be considered a much more flexible chip than the nRF51922, with which you are constrained to the softdevice that is preprogrammed.

[Ole Morten]

As for pricing, this is something you have to check with your distributor.