Measuring soil structure stability has always been a challenge, and various approaches have been proposed, mainly related to measuring soil aggregate stability upon wetting. This paper presents a rapid and cost-effective tool for evaluating soil structural stability named ASTAVIT, which stands for Aggregate STability Assessment using VIdeo Tests. The ASTAVIT principle involves visually monitoring the spreading of aggregates. This has already been implemented in the SLAKES smartphone application (now renamed Moulder), which simplifies the measurement of soil aggregates with minimal equipment. The aim of this work was to develop a robust, adaptable, and representative enough method that can be widely used in soil science laboratories. The protocol has been modified to use a 3D-printed plate, which source file is provided with this paper, to record the immersion of up to 96 individual aggregates in water. The increase in the projected area of the aggregates during slaking is tracked using image recognition software, ImageJ. The final stability index is determined based on this area increase. Soil structural stability can be assessed within an hour using a procedure that involves placing aggregates on a plate, filming, and analyzing. This method provides an objective evaluation of soil stability in a timely manner. The amount of soil used per test is similar to that used in Le Bissonnais tests (ISO 10930), ensuring representative results. The ASTAVIT index demonstrates expected behaviors of aggregate stability, as evidenced by its correlation with other soil characteristics and its ability to differentiate between soils that have undergone different tillage practices. An indicative classification of the ASTAVIT index into four categories of soil stability, similar to the Le Bissonnais tests, is proposed. ASTAVIT is expected to facilitate a broader implementation of structural stability studies.