# 3ID vs Period Tracker

The clearest difference is in-app purchases: 3ID at none against Period Tracker's 1. 3ID also leads on update cadence (every 2 months vs every 14 months) and iOS requirement (16.4 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. Period Tracker sells 1 one-off in-app purchase. 3ID asks for nothing beyond the download.

3ID ships an update every 2 months, Period Tracker every 14 months. The most recent releases landed on October 4, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | 3ID | Period Tracker |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 14 months |
| Monetization | Ad-supported | — |
| Size | 57 MB | 21 MB |
| Requires iOS | **16.4** | 18.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 17+ | 12+ |
| Developer | [3ID FISIOTERAPIA LTDA](https://appshunter.io/developer/1601226554) | [Lucas Diaz](https://appshunter.io/developer/1742950982) |

## What reviewers say

### 3ID

[App page](https://appshunter.io/ios/app/3id/id1601226552)

Manage clients with a focus on the elderly, geriatric clinics, and physiotherapy professionals. It also serves doctors and clients needing ongoing monitoring and support.

**Highlights:** Client management, Elderly care focus, Geriatric clinic support, Physiotherapy professional tools, Medical monitoring, Doctor client management

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

**In-app purchases:** none


### Period Tracker

[App page](https://appshunter.io/ios/app/period-tracker-neva/id6535696217)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited access | $2.99 | one-time |


## Frequently asked questions

### Is 3ID free?

3ID is free to download, with no in-app purchases.

### Is Period Tracker free?

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

### Do 3ID or Period Tracker have ads?

Neither 3ID nor Period Tracker shows ads.

### Which is updated more often, 3ID or Period Tracker?

3ID ships an update every 2 months, and Period Tracker every 14 months. Most recently, 3ID was updated on October 4, 2026 and Period Tracker on October 21, 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.*