# Calmer OS vs REDLN

Calmer OS and REDLN are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Calmer OS | REDLN |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/redln/id6756592288/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | — |
| Monetization | — | Free |
| Size | 12 MB | 4 MB |
| Requires iOS | **18.0** | 18.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Petr Betak](https://appshunter.io/developer/1775162907) | [colby truex](https://appshunter.io/developer/1669846235) |

## What reviewers say

### Calmer OS

[App page](https://appshunter.io/ios/app/calmer-os/id6737633514)

**Features:** macOS Compatibility

**In-app purchases:** none


### REDLN

[App page](https://appshunter.io/ios/app/redln/id6756592288)

This app helps weightlifters and fitness enthusiasts track workouts, monitor personal records, and visualize progress with a distraction-free interface. Log sets, reps, and weights easily, and automatically celebrate new personal bests. Customize workout splits and access an extensive exercise library.

**Highlights:** Effortless workout tracking, Automatic PR tracking, Customizable workout splits, Extensive exercise library, Progress visualization, Private and secure local data storage

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Calmer OS free?

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

### Is REDLN free?

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

### Do Calmer OS or REDLN have ads?

Neither Calmer OS nor REDLN shows ads.

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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.*