There are many stock screeners available. This page honestly explains who Fin Screener is for, what it does well, and what it does not do — so you can decide whether it fits your needs.
Fin Screener is a good fit if you want to run fundamental and technical screens on your phone — for example, finding financially sound BIST or US stocks with a strong Piotroski F-Score, or spotting oversold stocks by RSI. If you need real-time data, desktop charting or trade execution, a dedicated platform may suit you better.