# CalcuRun — Plan your races with science > Free race time predictor and training pace calculator for runners. (iPhone/iPad app by Joseph Iannazzone.) - Source: https://appshunter.io/ios/app/calcurun/id1554474187 (this page in markdown: same URL + `.md`) - Developer: [Joseph Iannazzone](https://appshunter.io/developer/1554474189) - Category: Health & Fitness, Reference - Price: Free with in-app purchases - Rating: 5.00/5 from 6 App Store ratings - Age rating: 4+ - Requires: iOS 18.6 · 2 MB - Languages: English - Released: 2021-02-24 - Data updated: 2026-06-01 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/calcurun/id1554474187/reviews.md ## What is CalcuRun? Tired of juggling apps, websites, and bookmarks to plan your race training? CalcuRun is an all-in-one solution — completely free, with no ads and no accounts. Newly redesigned in version 3.0 with a chronograph-inspired look and a dot-matrix display, CalcuRun helps you predict race times, plan splits, and dial in your workout paces. Features * Input a recent race or time trial and get accurate predictions across common race distances. * Use the "Other" race distance for non-standard events. * View splits for each race, in kilometers or miles. * Get workout paces based on your predictions. * Use the Calculator to plan an individual race — input a time or pace and calculate the other. * Sync your saved races and predictions across your iPhone and iPad with iCloud. * Redesigned iPad layout with a sidebar that takes advantage of the bigger screen. * Choose between the new dot-matrix display font or the system monospaced face. * Learn more about how the calculations are performed. Most importantly, your data is private. Calculations run entirely on your device. CalcuRun does not require an account, internet access, or any device permissions. iCloud sync is fully encrypted, and your data is never sent to a CalcuRun server. If you choose to follow any in-app links, only the URL is passed to your default browser. ## Key features - Predict race times based on recent performance - Plan workout paces - Calculate race splits - Support for custom race distances - iCloud sync across devices - On-device calculations for privacy ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | 1 Mile | $0.99 | one-time | | Turkey Trot | $3.99 | one-time | | 5K | $1.99 | one-time | | Half Marathon | $5.99 | one-time | | Marathon | $9.99 | one-time | ## Frequently asked questions about CalcuRun ### How accurate are CalcuRun's race time predictions? CalcuRun provides accurate predictions based on your recent race or time trial performance. The app uses scientific calculations to estimate your potential times across common race distances. ### Can CalcuRun help me plan my workouts? Yes, CalcuRun can provide workout paces based on your predicted race times. This allows you to tailor your training to achieve your race goals. ### Does CalcuRun require an internet connection? No, CalcuRun performs all calculations entirely on your device. It does not require an internet connection, ensuring your data remains private. ### Is CalcuRun available on Android? CalcuRun is currently available for iPhone and iPad. It supports iCloud sync across these Apple devices. ### How often is CalcuRun updated? The latest version, 3.0, was released on May 11, 2026. While specific update frequency isn't detailed, the app has seen significant redesigns, indicating active development. ### What is the age rating for CalcuRun? CalcuRun has an age rating of 4+, making it suitable for users of all ages. The app focuses on health and fitness calculations. ### Does CalcuRun have ads? No, CalcuRun is completely free with no ads. The developer prioritizes a clean user experience without advertisements. ### How does CalcuRun handle user data privacy? User data is highly private as all calculations are performed on the device. CalcuRun does not require an account or collect any personal information. ## Version history (last 5 releases) ### 3.0 — 2026-05-11 Welcome to CalcuRun 3.0 — the biggest update since launch. * All-new chronograph look with a dot-matrix display. * Your saved races and predictions now sync across devices via iCloud. * Redesigned iPad layout with a sidebar that puts the bigger screen to work. * New Display Font option in Settings if you'd rather use the system monospaced face. * More resilient progress chart and a smoother first-sync experience. * Tightened up race predictions and splits to handle edge cases more gracefully. ### 2.4.2 — 2025-10-14 Updated for iOS 26! ### 2.4.1 — 2023-07-30 Bug Fix in 2.4.1 - Fixed a bug that could cause the app to crash when viewing the new graph view when no races had been saved. --- New in 2.4 - Now view your progress in graph form! All of your races are converted to their 10K equivalent pace, then graphed. This should help you view general trends and see changes in your fitness. ### 2.4 — 2023-07-29 Now view your progress in graph form! All of your races are converted to their 10K equivalent pace, then graphed. This should help you view general trends and see changes in your fitness. ### 2.3.1 — 2022-08-11 Some of you may have experience duplicate labels on fields/menus on the Calculator and Race Update screens. These should be fixed! ## Apps similar to CalcuRun | App | Rating | Price | Category | | --- | --- | --- | --- | | [Watchletic - Run tracker](https://appshunter.io/ios/app/watchletic-run-tracker/id1606429298) | 4.5 (28) | Free | Health & Fitness | | [YouRace](https://appshunter.io/ios/app/yourace/id1572073081) | 3.8 (12) | Free | Health & Fitness | | [Paces: Running pace calculator](https://appshunter.io/ios/app/paces-running-pace-calculator/id1464856286) | 5.0 (5) | Free | Health & Fitness | | [Tempo: Run Log & Insights](https://appshunter.io/ios/app/tempo-run-log-and-insights/id1106746589) | 4.7 (1,018) | Free | Health & Fitness | | [Trackster - #1 training app](https://appshunter.io/ios/app/trackster-1-training-app/id1207582363) | 4.5 (244) | Free | Health & Fitness | | [Simple Pace Calculator](https://appshunter.io/ios/app/simple-pace-calculator/id817223789) | 4.1 (19) | Free | Health & Fitness | ## More apps by Joseph Iannazzone - [CalcuSplit](https://appshunter.io/ios/app/calcusplit/id1563953421) - [LetterCode](https://appshunter.io/ios/app/lettercode/id1603512717) - [Fanciful Fonts](https://appshunter.io/ios/app/fanciful-fonts/id6446179951) - [QRV - Ham Radio Multitool](https://appshunter.io/ios/app/qrv-ham-radio-multitool/id6754951380) All apps by Joseph Iannazzone: https://appshunter.io/developer/1554474189 --- *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 2026-06-01.*