Remember when you had to use a digital camera to take photos of something you wanted to sell online? Then you had to somehow transfer those photos to your computer and edit them because the file size was gargantuan and, as often as not, the photos imported themselves sideways or upside down. Then you'd log into a website like Craigslist or eBay, upload the photos, fill out a complex form, publish your listing, wait a while for someone on the other end to approve your listing, and either start hitting the refresh button or stay near your computer so you could check your email.

Mobile app technology has changed all of that. Now you can snap a few professional-quality photos with your smartphone and post a listing on an app in under a minute. Selling stuff online has gotten so much easier than it ever was before. So whether you're trying to get rid of some clutter, make a few extra bucks, or start a full-fledged online business selling stuff, the mobile app market is at your fingertips. Let's look at some of the best apps for selling stuff online in 2020.

OfferUp

OfferUp is like a more mobile-user-friendly Craigslist. (It's not affiliated with that website, by the way.) But with OfferUp, you can upload a few pictures that you've snapped with your smartphone, add price and description, publish, and wait for the notifications to hit your phone. Because of the mobile notifications options, you don't have to exchange actual contact information, like your phone number or email address. Everything can be handled on the app. You'll also find that OfferUp and Craigslist cater to slightly separate user bases, so if you post an ad on each, you can often widen your reach.

Facebook Marketplace

Another place to sell items that you're trying to get rid of is Facebook Marketplace. There's no separate mobile app for this handy selling tool; instead, it's part of your regular Facebook app. If you prefer to use Facebook in a browser, you can access Marketplace in the browser, too. People use this feature of the popular social media website to sell cars, clothes, electronics, home goods, and all kinds of things. Since it's almost as easy to use as OfferUp, some sellers will list their items on both apps.

VSCO

VSCO is a photo and video editing app with around 62,000 apps and an average rating of 4.5 stars. If you're selling stuff online and you want to take your product image quality to the next level (without hiring a professional photographer), you might want to purchase an advanced photo editing app like this one. VSCO comes with over 200 preset filters, some of which give your photos a vintage Kodak or Fuji film look, and others that can add stylish borders. (Forget clipart borders, if that's what you're thinking; these are the real deal.) The app also provides video editing features, because we all know that sometimes videos can help improve your chances of selling an item.

Grammarly

When you're writing a description of the stuff you want to sell, it doesn't hurt to run your polished prose through an online grammar editor. Grammarly, which we featured on our list of the best writing apps for 2021, will make suggestions based on grammatical correctness, verbal clarity, engagement factors, and style usage. It's not uncommon to find professional eBay sellers who use the Grammarly app to fine-tune their prose before hitting the publish button. You can find this app on both iOS and Android platforms now, in addition to its robust desktop and browser versions.

Helium 10

Now we're going to jump into the exciting world of selling on Amazon. This isn't the type of online selling for people who want to clear out the garage, but selling on Amazon can be a full-time, lucrative business when done right. One of the most popular Amazon seller tools is called Helium 10, and it brings with it a full suite of cutting edge technology, including just about everything you need to start, run, and grow an Amazon selling business. Helium 10 provides a mobile app, too, which can be handy when you want to look at critical data, track orders, access ad performance, or view sales stats--all while on the go.