Wizzairs cabin baggage policy is exactly the same as Ryanair. 1 piece 55x40x20cm, maximum 10kg.
Wizz Air
General Terms + Conditions of Carriage
Easyjets is slightly bigger and carries no weight restriction other than you must be able to lift it into the over head bin without assistance. Also in my experience easyjet are not so pedantic or likely to charge you extra at the gate or check in.
Baggage allowances | easyJet.com