# HowFast – Drag Race Predictor — Predict Your ET. Dial In. Win. > Drag race elapsed time predictor and performance logger. (iPhone/iPad app by DtimesTwo Technologies LLC.) - Source: https://appshunter.io/ios/app/howfast-drag-race-predictor/id6762416113 (this page in markdown: same URL + `.md`) - Developer: [DtimesTwo Technologies LLC](https://appshunter.io/developer/1894087614) - Category: Sports, Utilities - Price: Free with in-app purchases - Rating: 5.00/5 from 3 App Store ratings · 3 written reviews indexed - Age rating: 12+ - Requires: iOS 26.2 · 15 MB - Released: 2026-06-07 - Data updated: 2026-06-26 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/howfast-drag-race-predictor/id6762416113/reviews.md ## What is HowFast? Know your number before you stage. HowFast predicts your elapsed time using your vehicle's real specs — engine, drivetrain, tires, and the air conditions at your track. Whether you're dialing in for bracket racing or just curious how quick your car really is, HowFast gives you a data-driven starting point that gets smarter every time you run. Predict with confidence HowFast builds your ET prediction from the ground up — horsepower, drivetrain loss, tire grip, shift times, and real-time density altitude correction. The more you run, the more accurate it gets. HowFast learns from your actual timeslips and adjusts future predictions automatically. Built for the track, not the spec sheet! No expensive GPS hardware required. Use your iPhone's built-in GPS for run detection and timing, or connect to a RaceBox or Qstarz external GPS unit for precision timing at up to 25Hz. HowFast automatically detects your run and starts logging — no tapping required. Your logbook, is always with you! Every run is saved with your predicted ET, actual ET, speed, and conditions. Review your history, spot trends, and see how your tune is progressing over the season. Export Every Run in the DynoLog app effortlessly! HowFast captures your ET, trap speed, 60-foot time, and atmospheric data at the strip. DynoLog is where that data becomes a permanent part of your build record — plotted on a performance timeline, correlated to every mod you've made, and exportable as a professional PDF build sheet. After your pass, tap Export to DynoLog or login and the run lands in your build log automatically — no manual entry, no duplicate imports, no data left behind. Upgrade to Pro — one time purchase, yours forever. Unlock the full HowFast experience with a single one-time purchase: OBD-II connectivity— see your RPM, TPS, gear you're in, in real time Multi-run comparison — overlay runs and telemetry to find where you're gaining or losing Unlimited vehicles in your garage CSV export — take your data anywhere HowFast Pro is a one-time purchase. No subscription, no recurring charges. Whether you're a seasoned bracket racer chasing a perfect dial or a weekend warrior seeing what your car can do, HowFast is the smartest co-driver you've never had. ## Key features - Elapsed time prediction - Real-time density altitude correction - Automatic run detection - Run history logbook - Export to DynoLog - OBD-II connectivity (Pro) - Multi-run comparison (Pro) ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | HowFast Pro | $7.99 | one-time | ## Recent user reviews (3 of 3) All indexed reviews: https://appshunter.io/ios/app/howfast-drag-race-predictor/id6762416113/reviews.md ### 5/5 — Very responsive *2026-06-11* Great app and developer was very responsive to a question I had. ### 5/5 — Yay *2026-06-10* I love this app it’s so easy to use. I’m gonna use it at my race this weekend ☺️ ### 5/5 — Awesome app! *2026-06-10* The app interface is easy to navigate and allows for easy use. I like that the app can connect to external GPS to help improve accuracy. The logbook is super convenient for looking at past run times and is helping me improve my tuning in real time. ## Frequently asked questions about HowFast ### How does HowFast predict my elapsed time? 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. ### Does HowFast have ads? Yes, HowFast contains advertisements. These ads are displayed within the application to support its development and maintenance. ### What devices does HowFast support? HowFast is available on iPhone and iPad devices, leveraging their built-in GPS for run detection and timing. ### How do I upgrade to HowFast Pro? 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. ### How often is HowFast updated? 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. ### Can HowFast connect to external GPS units? 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. ### What data does HowFast log for each run? 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. ### Is HowFast suitable for bracket racing? 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. ## Version history (last 2 releases) ### 1.2 — 2026-06-25 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. ### 1.0 — 2026-06-07 No release notes. --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-26.*