Chances are you've given something you've enjoyed online a thumbs-up before, or rated your latest purchase or Netflix movie a 3 out of 5 stars, but have you ever expressed your opinion in color?

Knotch is an app that offers a different take on expressing your opinion. It allows users to express their opinions with colors, labeling everything from the latest smartphone to a television show in various hues that correspond to their feelings about that product or service. The app launched late last year, and updated to version 1.2 on Thursday.

“The idea initially was just to find a way to quantify opinions,” Knotch co-founder Anda Gansca told Mashable. “We were super-fascinated by how ads are targeted toward us.”

Knotch created a focus group to determine how people like to express their opinions, and in the end, they most liked the idea of expressing opinions in color form, taking a virtual temperature of how they feel about a particular topic.

With the app, you can type in a topic — or select from what’s currently being discussed on the platform — and weigh in on whether you feel hot or cold about it, selecting from a sliding scale of colors. Bright red indicates that a topic is something you enjoy, and dark blue means you feel "cold" about something, or don't like it.

More than just a color rating, you can also add a short comment to your posting to explain why you may have rated something the way you did.

“We wanted to find a way to bring the end user into the process of data collection and analysis in a way that’s incredibly public and empowering for the user,” says Gansca.

While the app lets you post your opinions — called knotches — on Facebook, most users choose to keep that information private in Knotch. Gansca says 80% of Knotch users never post to Facebook, instead building relationships with people in the app based on their similar opinions. 82% of users have opted to follow someone on the service outside of the social graph, forming a relationship based on their opinions.

Knotches biggest group of users — males between 24 and 35 — actually use the service like they would Reddit, spending more than 30 minutes a day in the app each day, knotching on different topics and commenting on others' posts.