# O vs OoptiFit

The clearest difference is in-app purchases: O at none against OoptiFit's 2. O also leads on ads (none vs shown) and iOS requirement (9.0 vs 16.0). OoptiFit's advantage is update cadence (every 6 days vs every 3 weeks). On price and device support there is nothing between them.

Both are free to download. OoptiFit sells 2 in-app purchases, starting at $1.49 per month. O asks for nothing beyond the download.

O ships an update every 3 weeks, OoptiFit every 6 days. The most recent releases landed on October 19, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | O | OoptiFit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/ooptifit-weight-tracker/id6743363224/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Every 6 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 5 MB | 19 MB |
| Requires iOS | **9.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Shenzhen LINGXI Technology Co., Ltd](https://appshunter.io/developer/957619029) | [OPTIMALBYTE LTD](https://appshunter.io/developer/1799229786) |

## What reviewers say

### O

[App page](https://appshunter.io/ios/app/o-1/id1592076425)

This app helps you manage your weight and physical data. It collects information from body fat scales and your smartphone to calculate and store various health metrics.

**Highlights:** Body data collection, Health data analysis, Health data storage, Calculates health indices, Integrates with body fat scales

**Features:** macOS Compatibility

**In-app purchases:** none


### OoptiFit

[App page](https://appshunter.io/ios/app/ooptifit-weight-tracker/id6743363224)

Track your weight loss, gain, or maintenance journey with this app. It offers easy logging, BMI calculations, visual progress charts, and personalized guidance from an AI Health Coach. Integrate with Apple Health for a comprehensive view of your wellness.

**Highlights:** Weight logging and history, BMI and health status calculation, Visual progress charts, AI Health Coach for personalized guidance, Apple HealthKit integration, Multi-unit support

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $1.49 | per month |
| Yearly Premium | $9.99 | per year |


## Frequently asked questions

### Is O free?

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

### Is OoptiFit free?

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

### Do O or OoptiFit have ads?

OoptiFit shows ads; O does not.

### Which is updated more often, O or OoptiFit?

O ships an update every 3 weeks, and OoptiFit every 6 days. Most recently, O was updated on October 19, 2026 and OoptiFit on October 24, 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.*