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My fluid diary as an alternative tool for daily recording fluid intake: cross over study among adolescent girls Background: Water plays a vital role in the human body. The respondents found the fluid intake record using paper-based excessively burdensome, so a smartphone-based application was developed as a drink intake recording tool. Objective: Assessing the validity of My Fluid Diary as a fluid intake recording tool using 7-day records as a reference method. Methods: A crossover study was conducted involving 38 female students of SMKN 1 Banyumas. Total water intake was recorded for seven days for each method (smartphone-based and paper-based), with 14 days washout period between the two methods. To determine the difference in water intake between the two methods, the Wilcoxon Signed Rank Test was used; Bland-Altman plots and linear regression tests were used to determine the agreement between the two methods; and the Spearman test was used to determine the relationship between water intake and hydration status. Results: Water intake was significantly higher with smartphone application-based recording than with paper-based recording (1008.3 (421.3 – 2363) and 763.2 (435 – 1875.5); p 0.0001), with agreement limit of 1, 11 – 3.00 and ß -value (0.296) p-value 0.05 in the regression test, indicating no fixed bias. The findings of recording water intake and hydration status were significantly correlated with the two methods (p-value