Participation via SMS and WhatsApp is especially successful for companies with many commercial employees, as it allows people without email or PC access to participate in the recommendation process.
We use the messaging APP on a daily basis. We are used to it and so we usually do not block push notifications either. This makes it easier to reach employees than by comparison with a dedicated APP, which is quickly muted and forgotten.
If the employee would like to have an APP, the mobile web solution can also be displayed as an APP icon on the end device - completely without downloading.