When looking for the best stocks to buy and watch, focus on those with rising relative price strength.

One stock that fits that bill is Duolingo stock, which had its Relative Strength (RS) Rating upgraded from 79 to 87 Friday. The language learning app stock debut on July 28.

When looking for the best stocks to buy and watch, one factor to watch closely is relative price strength.

This proprietary rating tracks market leadership by using a 1 (worst) to 99 (best) score that identifies how a stock's price action over the trailing 52 weeks matches up against the rest of the market.

History shows that the top-performing stocks often have an 80 or better RS Rating in the early stages of their moves.

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Is Duolingo Stock A Buy?

Duolingo stock has climbed more than 5% past a 152.94 entry in a first-stage ipo base, meaning it's extended and now out of a proper buy zone. Look for the stock to create a new chance to pick up shares like a three-weeks tight or pullback to the 50-day or 10-week moving average. Read "Looking For The Next Big Stock Market Winners? Start With These 3 Steps" for more tips. Also, check out "Stocks To Buy And Watch: Top IPOs, Big And Small Caps, Growth Stocks."

The language learning app firm reported -200% earnings growth in its most recent report, while sales growth came in at 47%.

Duolingo stock earns the No. 5 rank among its peers in the Computer Software-Education industry group. Zedge and Instructure Holdings Inc are also among the group's highest-rated stocks.