With everyone using apps on their phones, some will give incentives for entering a Sign Up Code.
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Some app sign up codes give extra money, some give other incentives. Extras are always nice to receive though in my opinion. If you are looking to make money from home by using other (non-app) means, see my other post Making Money From Home. Below are the apps I use with sign up codes to (hopefully) give you a little something extra:

Ibotta:
You can earn extra money back from purchases you already make! Just download the app and upload receipts. Money earned in return can be redeemed for gift cards or deposited to your account. Sign up here to earn $10 just for signing up!
NCPMobile:
Scan all your purchases so stores know what people like to buy and earn points. There are also surveys to take to earn more points. Redeem points towards gift cards! Sign up with referral code: 1DD6102
Solitaire Cash:
I know this sounds like it can’t be true, but you can get money while playing solitaire. I usually pull this app out while waiting, whether in line or at appointments. Sign up here to earn $1 just for signing up!
thredUP:
Like buying great-looking, second-hand clothes from home? And get paid for your old ones? This is your place to go! Get $10 off your first order by clicking here!
DoorDash:
You don’t always like to go out and pick up food. Delivery is a great thing sometimes. Get up to $30 off your orders when you click here!
Del Taco:
Who doesn’t love some Del Taco? Sign up with referral code: PKWM-MURD
El Pollo Loco:
Want some yummy grilled chicken? Sign up with referral code: ERIKAAN7476
Instacart:
Unfortunately, this app does require you to leave your home. However, for those that like to shop or at least get out of the house, this is not a bad gig. You can sign up to only shop, or shop and deliver. Sign up here to start!