Research by privacy company ALLOW has revealed that popular apps such as UK tax calculators, UK Salary Calculator and Account Tracker have no policy to protect your personal information.
"There's no doubting that apps are handy and they are fast becoming integral to many people's lives.
"However, what users may not realise is that app developers crave their personal data because it is extremely valuable for marketing purposes," warned Justin Basini, co-founder of Allow.
"Before downloading an app check what personal data the developer collects and what it is used for. Some apps can even track your location and use your camera facility."