SplitTime vs CalcuRun
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SplitTime
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Enter a distance you have completed. Then, they select a time you have completed that distance. After entering a distance you want to predict and a split distance you are interested in using, the splits and predicted finish time will be displayed. The timer icon in the top right will produce a timer with split information. After recording the split times, they can be shared from the timing module through email, text, Facebook, etc... The formula for calculating predicted finish times are based upon a combination of a models created by Dave Cameron and Pete Riegel. They provided two of the most accurate race time predictors across a range of performances. Notes for good use: 1) If you want to create split times for a specific time and distance, enter the same distance for "Completed Distance" and "Predicted Distance" with the desired finish time. 2) The closer the "Completed Distance" and "Predicted Distance" are, the more accurate your prediction will be. 3) Enter a time that matches with your current ability. A personal record should not necessarily be the "Race Time" unless it matches with your current ability.
CalcuRun
This app helps runners predict race times, plan training paces, and calculate race splits. It offers a science-based approach to training, with predictions based on recent performance. All calculations are done on-device for privacy.
- 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
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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.
Screenshots
Verdict
The clearest difference is in-app purchases: SplitTime at none against CalcuRun's 5. SplitTime also leads on iOS requirement (7.0 vs 18.6). On price, update cadence, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. CalcuRun sells 5 one-off in-app purchases. SplitTime asks for nothing beyond the download.
SplitTime ships an update every 2 weeks, CalcuRun every 4 weeks. The most recent releases landed on October 8, 2026 and October 18, 2026 respectively.
| Parameter | SplitTime | CalcuRun |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (6 ratings) — better |
| Number of ratings | — | 6 — better |
| Update frequency | Every 2 weeks — better | Every 4 weeks |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 7.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 7 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Iain Hunter | Joseph Iannazzone |
In-app purchases
SplitTime
No in-app purchases
CalcuRun
- 1 Mile$0.99
- 5K$1.99
- Turkey Trot$3.99
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- Half Marathon$5.99
- Marathon$9.99









