These apps may be free to download, but once they're on your phone, you're likely spending cold hard cash when you use them. Delete or spend at your own peril!

Data-suckers

When Dan Frommer of Quartz took a look at which of his apps were gobbling up most of his data usage, he was surprised.

"Twitter turns out to be my biggest 'expense,' he wrote. "This seemed surprising at first: isn't Twitter just 140-character text snippets? But with all the photos and videos in the Twitter stream today, plus loading websites in the built-in browser, addict-level usage adds up." Next in line, Instagram.

If you're only using these apps on wifi, you're not spending by scrolling. But if you can't resist seeing what your ex is up to when you're sitting in the no-wifi dentist's waiting room, then it's gonna cost you. Delete and set yourself free.

Instagram

Sure, it's free, and yeah, you're just using it for fitness inspiration or keto recipes or whatever you tell yourself. But Instagram's super-targeted, compelling, and on-point ads may be causing you to click-to-buy products you'd never otherwise consider. You know: the miracle exfoliator, the chicest workout leggings, the meal kit that will make your life easier and way more delicious.

Seven out of ten hashtags on Instagram are branded, which means most of the time you're interacting with advertisers whether you realize it or not. In 2016, at least thirty percent of Instagram's users had purchased a product they first discovered on the platform; in 2018, when the monthly users were up to 1 billion on the platform, there was sure to be even more app-driven purchases. And yes, we speak from personal experience.

Amazon

You love your Prime, we know. We do too. But all the seductive lure of those free deliveries is causing you to spend beaucoup bucks. When you've got the phone in your hand and one-click buying activated, a new backyard hammock or silky nightgown or kitchen gadget is one tap away. And the taps add up.

Research has shown that Prime members spend an average of $1,300 per year on Amazon, compared with just $700 for non-Prime customers. Take the app off your phone and you might find a new way to fund that trip to Portugal you've been dreaming of.

Don't stop at Amazon; this goes ditto for all your go-to shopping apps, like ShopBop and Etsy. According to App Annie, time spent on Amazon, Amazon Shopping, Wish, Etsy and Zulily grew 44 percent in the first half of 2017 compared with the first half of 2016. If you're spending time, you're probably spending money.

Food Delivery Apps

Any time you're making convenience too, well, convenient, you're hurting your wallet. Consider dinner. Between taxes, service fees, delivery charges and driver tips, a $10 burrito can easily turn into a $20 mindless splurge.

Americans spend an average of $63 a month on food delivery services. that's $756 a year — enough for a round-trip ticket to Europe. When HuffPost editor Janie Campbell wrote about her reliance on Postmates, she found that the had spend $287.71 on delivery fees and another $70.88 for additional fees in the first 22 days of a month.

Delete that app and use your phone the old-fashioned way — to call in a pick-up order. Or save mondo bucks by learning a few easy-to-whip up pantry meals; soon enough you'll have saved enough to eat ramen in Tokyo.