Yes. You may use your laptop, tablet, smartphone and other electronic devices on board Ryanair flights. Your device will need to be switched to flight mode for the entire flight duration.
Laptops and larger electronics can be used once the fasten seatbelt sign has been turned off. For safety reasons, these items must be kept in the overhead locker or stored in your bag under your seat when the aircraft is taxiing (moving towards the runway for take-off or towards the terminal after landing), take-off and landing stages of your flight.