CalcuRun vs ExerNation
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
ExerNation
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ExerNation: exercise platform for achieving your running workout goals on Apple Watch: - Supports both outdoor and indoor running - Configure your own voice for audio feedback - Precision mode allows you to recalibrate distance at a mile marker in a race - Dynamically adjusts your target pace as needed to achieve your goal time * Free version is distance-limited. Purchase subscription to upgrade distance. Warning: Continued use of GPS running in the background can dramatically decrease battery life. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula Privacy Policy: http://www.fastbri.com/privacy/exernation
Screenshots
Verdict
CalcuRun and ExerNation are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
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 and ExerNation sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.
CalcuRun ships an update every 4 weeks, ExerNation every 2 weeks. The most recent releases landed on September 9, 2026 and September 13, 2026 respectively.
| Parameter | CalcuRun | ExerNation |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (6 ratings) — better | — |
| Number of ratings | 6 — better | — |
| Update frequency | Every 4 weeks | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, Apple Watch |
| Requires iOS | 18.6 | 17.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Joseph Iannazzone | FastBri |
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
ExerNation
- Unlimited Length Workouts!$9.991 Month
- Unlimited Length (One-Time)$99.99








