# Attune vs Calla

The clearest difference is update cadence: Attune at every 2 days against Calla's every 4 days. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Attune sells 2 in-app purchases, starting at $5.99 per month and Calla sells 2 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.

Attune ships an update every 2 days, Calla every 4 days. The most recent releases landed on October 13, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Attune | Calla |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/attune-hrt-tracker/id6790181150/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 4 days |
| Monetization | Freemium | — |
| Size | 6 MB | 69 MB |
| Requires iOS | 17.0 | **16.4** |
| Devices | **iPhone, Apple Watch** | iPhone |
| Age rating | 12+ | 12+ |
| Developer | [Ilia Usatov](https://appshunter.io/developer/1868442271) | [Arman Malkhasyan](https://appshunter.io/developer/6804423803) |

## What reviewers say

### Attune

[App page](https://appshunter.io/ios/app/attune-hrt-tracker/id6790181150)

Effortlessly track hot flashes and monitor the impact of hormone therapy. Log symptoms with a single tap on your iPhone or Apple Watch, and visualize changes in your health data over time. Generate comprehensive reports for your doctor.

**Highlights:** One-tap hot flash logging, Hormone therapy dose tracking, Sleep and heart rate integration, Customizable reminders, Doctor-ready PDF reports, Data export to CSV

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $5.99 | per month |
| Yearly | $49.99 | per year |


### Calla

[App page](https://appshunter.io/ios/app/calla-perimenopause-tracker/id6804423801)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Calla Pro - Monthly | $7.99 | per month |
| Calla Pro - Yearly | $39.99 | per year |


## Frequently asked questions

### Is Attune free?

Attune is free to download, with in-app purchases available.

### Is Calla free?

Calla is free to download, with in-app purchases available.

### Do Attune or Calla have ads?

Neither Attune nor Calla shows ads.

### Which is updated more often, Attune or Calla?

Attune ships an update every 2 days, and Calla every 4 days. Most recently, Attune was updated on October 13, 2026 and Calla on October 18, 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.*