There are apps to check the weather, rail timetables and your bank balance.
Now they can help you check if your partner is cheating on you.
A number of apps have been created that allow those of a jealous disposition to track their partner using GPS.
For the more controlling, they can also intercept and read communication made by their significant other - including texts, social media messages and phone calls, though both partners need the app on their phone.
Figures reveal more than 40 per cent of people in Britain have admitted to checking their partner's phone - a quarter having done so without consent.