Colored solutions are obtained by dissolving transition metal salts in water. Coloration occurs due to partial absorption of visible light spectrum. Fotons that pass unabsorbed cause the coloration. Concentration determination of colored solutions is performed by spectrophotometry. Preparing solutions of known concentration and measuring absorbance leads to the construction of calibration curve. Unknown concentration of solution can be found by measuring apsorbance and using absorbance in linear equatation. Any smartphone that has a camera can be used for taking pictures. Cameras can differ by megapixel count, sensor quality, lens quality, image stabilization. Availability of smartphones has increased over the last few years. In addition to their primary function as a means of communication smartphones have great potential in various areas of technology, marketing, science etc. The aim of this experiment was to determine whether smartphones can be used for concentration determination of colored solutions. Solutions that were used for determination of concentration are KMnO4 with concentration range from 2∙10-5 M to 10-2 M and CuSO4 from 2∙10-3 M to 1M . The results show that the method is suitable for determining concentration of KMnO4 in concentration range from 2∙10-5 M to 1.5∙10-3 M using the intensity of green to calculate absorbance. Intensities of red were used to determine unknown concentration of CuSO4 in concentration range from 2∙10-3 M to 1M. By using the wide-angle lens calibration curve tends to be better for both solutions if the intensity of red is used for calculation of absorbance. The calibration curve obtained for KMnO4 is better without using wide-angle lens if the intensity of green or blue is used for calculation of absorbance. The method is fast, cheap and can be preliminary method for basic determination of colored solutions unknown concentration.