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COLORADO SPRINGS, COLO. -- There's a big difference between drunk and sober, but that line becomes blurry after a few drinks. But the new R-U-BUZZED app for smartphones by the Colorado Department of Transportation could be changing all that by helping people estimate when it's time to drink or order the bill.

"The person may have an overinflated sense of what they're doing. They may think they're performing well, when they're not," Sgt. Craig Simpson with the Colorado Springs Police Department said.

It's your typical Saturday night for Amy Dilsaver and Jonathan Hilmo - they're spending the night with our partners at Rhino's Sports and Spirits, and FOX21 came along with them, tracking what they drink and plugging it into the app to see if it really works.

After one hour of drinking our two volunteers are feeling the effects of their night out. Dilsaver has had two mixed drinks and Hilmo has had two mixed drinks and two martinis According to the app, Hilmo is "buzzed" with a BAC of 0.055 percent, and Dilsaver is good to go with a BAC of 0.04 percent.

"I'm feeling pretty happy, not drunk," Dilsaver said.

Hilmo was in a similar state.

"I'm feeling slightly buzzed, pretty good, loose, relaxed," Hilmo said.

One hour later, and two hours into drinking, our volunteers are both drunk. Dilsaver has now had a total of five liquor drinks, and one wine pushing her app BAC to 0.131 percent - way over the limit. Hilmo has now had a total of five liquor drinks and one beer, increasing his app BAC to 0.081 percent. Like Dilsaver, he's done.

"Honestly I'd probably stay at the bar for an hour and maybe have something non-alcoholic, and probably drive home," Dilsaver said.

Hilmo said he felt okay, even though he wasn't.

I definitely feel the effects of alcohol, I don't feel like I'm impaired enough to be swerving in the road," Hilmo said.

Now it's time for the real DUI test - a breathalyzer and field sobriety test by the Colorado Springs Police Department. Dilsaver clocked in at 0.114 and Hilmo was at 0.084. Compared to the R-U-BUZZED app, the results are pretty close, and both would have been arrested for DUI.

"If you're going to use it, it's a general approximation. If it said you're below the limit, that in no way means you're safe to drive," Simpson said.

Keep in mind the app is only an estimate and the calculations are averages that can vary. While 0.08 is the legal limit, there are people who may be impaired at a much lower level and can still be arrested.