# RunPaceCalc vs Flexx.

The clearest difference is review sentiment: Flexx. at 100% against RunPaceCalc's 0%. Flexx. also leads on price (Free vs $0.99) and iOS requirement (15.0 vs 18.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

Flexx. is free to download; RunPaceCalc costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

RunPaceCalc ships an update every 14 months, Flexx. every 9 months. The most recent releases landed on October 11, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | RunPaceCalc | Flexx. |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[5.0 (5 ratings)](https://appshunter.io/ios/app/flexx/id6475006579/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 9 months** |
| Monetization | Paid | **Free** |
| Size | 3 MB | 148 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | +4 | 12+ |
| Developer | [Magnus Hjelm](https://appshunter.io/developer/341394849) | [Flexx](https://appshunter.io/developer/1723037324) |

## What reviewers say

### RunPaceCalc

[App page](https://appshunter.io/ios/app/runpacecalc/id492038549)

Easily calculate running pace and speed by inputting distance and time. This tool offers a streamlined interface for quick calculations of all key running metrics in one place.

**Highlights:** Calculate distance, time, speed, and pace, Supports kilometers and miles, Quick values in side panel, Easy and fast interface, Reset calculator by shaking device

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Flexx.

[App page](https://appshunter.io/ios/app/flexx/id6475006579)

This app helps you monitor workouts, track progress, and achieve fitness goals with personalized plans and engaging challenges. It integrates with HealthKit for seamless data syncing and offers class scheduling.

**Highlights:** Workout tracking, Personalized training plans, Activity level milestones, Fun challenges with rewards, Class scheduling and booking, HealthKit integration

**Features:** macOS Compatibility, Apple Wallet, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is RunPaceCalc free?

RunPaceCalc costs $0.99, with no in-app purchases.

### Is Flexx. free?

Flexx. is free to download, with no in-app purchases.

### Do RunPaceCalc or Flexx. have ads?

Neither RunPaceCalc nor Flexx. shows ads.

### Which is updated more often, RunPaceCalc or Flexx.?

RunPaceCalc ships an update every 14 months, and Flexx. every 9 months. Most recently, RunPaceCalc was updated on October 11, 2026 and Flexx. on October 1, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*