Predict your drag race elapsed times with real vehicle specs and atmospheric conditions. The app learns from your runs to improve accuracy and logs every pass for detailed analysis. Upgrade for advanced features like OBD-II connectivity and multi-run comparisons.
1.2
June 25, 2026
HowFast now has integration with the Dynolog app. This update allows you to share your runs three different ways — all live. Tap Export in HowFast for a one-tap deep link that brings the run straight into DynoLog. Export a full season as a .dynolog file for batch import. Or sign into your DynoLog account (using your Apple or Google ID) on both apps and enable cloud sync — runs arrive on your DynoLog timeline automatically in the background. You are not required to install/use Dynolog for HowFast to work. Dynolog is an excellent companion app to track your tunes/builds/mods/build investmen and performance.
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HowFast Pro
Unlock the full HowFast experience.
HowFast uses your vehicle's specific specs like horsepower, drivetrain loss, and tire grip, combined with real-time atmospheric conditions. It then learns from your actual timeslips to refine future predictions, making it a data-driven starting point for your runs.
Yes, HowFast contains advertisements. These ads are displayed within the application to support its development and maintenance.
HowFast is available on iPhone and iPad devices, leveraging their built-in GPS for run detection and timing.
HowFast Pro is available as a one-time purchase within the app. This unlocks features like OBD-II connectivity, multi-run comparison, unlimited vehicles, and CSV export without any recurring subscription fees.
The latest version of HowFast is 1.2, and it was last updated on June 25, 2026. Updates typically include performance improvements and new features based on user feedback.
Yes, HowFast can connect to external GPS units like RaceBox or Qstarz for precision timing at up to 25Hz, offering enhanced accuracy for your runs.
Each saved run includes your predicted ET, actual ET, trap speed, 60-foot time, and atmospheric data. This information is stored in your logbook for review and analysis.
Yes, HowFast is designed for bracket racing, providing a data-driven starting point to dial in your predictions. It helps you understand your car's performance and make informed decisions on the track.