Is that feeling when money disappears from your wallet and accounts? It is about to get worse.

When an app on Apple's App Store increased its subscription price, subscribers were required to opt in. The subscription would not be renewed at the next billing period if they failed to do so.

This has changed. App developers will now be able to increase subscription price without the user being notified, according to an update on its site for developers.

There are certain criteria that need to be met for this to happen. The specific conditions for this feature are that the price increase doesn't occur more than once per year, doesn't exceed US$5 and 50% of the subscription price, or US$50 and 50% for an annual subscription price.

Users will have to opt in for price increases that are above the limits.

The opt in requirement led to some services being interrupted for users who then had to resubscribe, according to Apple. Users will be notified via email, push notification, and a message within the app when the prices change.

An app that initially charged you $100 per year could increase that to $250 per year over three years, which is not insignificant. Users will have to be more careful when it comes to checking the price of their app subscriptions because price increases can only happen once a year.