<p>The present study proposes an open-source multi-platform based application, ‘Q-slope Calculator’ to facilitate rapid and efficient calculations. The present study employs manual and automated computation of the Q-slope method along an identified vulnerable stretch along National Highway-7 (NH-7) between Karnaprayag and Joshimath in the Lesser Himalayas. The Q-slope values range from 0.0262 to 4.4976 and 96% of the studied slopes fall in the unstable zone, while the remaining 4% are critical slopes. Since the Q-slope method does not have any detailed guidelines for evaluating orientation, to address this limitation, the present study utilized F1, F2 and F3 parameters of a well-established SMR system for a better kinematic assessment and correlated with the O-Factor of the Q-slope method. For quantitative assessment of joint roughness, the method developed by Palmstrom has been used. Kinematic analysis of studied slopes depicted that 9 slopes are prone to planar failure, 10 slopes for wedge failure and 5 slopes show vulnerability to toppling mode. Reinforcement-free safe cut slope angles (β) were also calculated. The proposed application, ‘Q-slope Calculator,’ is advantageous due to its rapid computations, continuous functions for computations and modified O-Factor. It computes Q-slope values for multiple locations, and values can be exported to multiple locations in a single Microsoft Excel sheet. The outcomes of the proposed software have been validated by manual calculations for all 24 slopes. The proposed software offers a practical decision-support tool for rock engineers and highway planners engaged in cut slope designing and management.</p>