# Perfect OB Tracker vs ONI DIDI +

The clearest difference is price: ONI DIDI + at Free against Perfect OB Tracker's $6.99. Perfect OB Tracker's advantage is chart position (#162 vs unranked) and iOS requirement (13.0 vs 15.6). On update cadence, ads, in-app purchases and device support there is nothing between them.

ONI DIDI + is free to download; Perfect OB Tracker costs $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Perfect OB Tracker ships an update every 2 weeks, ONI DIDI + fortnightly. The most recent releases landed on October 14, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Perfect OB Tracker | ONI DIDI + |
| --- | --- | --- |
| Price | $6.99 | **Free** |
| Rating | **[4.9 (408 ratings)](https://appshunter.io/ios/app/perfect-ob-tracker/id581826761/reviews)** | — |
| Number of ratings | **408** | — |
| Positive reviews | 74.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Fortnightly** |
| Monetization | Paid | — |
| Best chart rank | **#162** | — |
| Size | 12 MB | 33 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Evan Schoenberg](https://appshunter.io/developer/289039917) | [OniCares Education Pvt Ltd](https://appshunter.io/developer/1548470645) |

## What reviewers say

### Perfect OB Tracker

[App page](https://appshunter.io/ios/app/perfect-ob-tracker/id581826761)

**Currently charting:** #162 Top Paid · Medical (US App Store)

This app provides a comprehensive pregnancy wheel and tracker for medical professionals. It allows for managing multiple patients, calculating due dates, tracking gestational age, and even monitoring postpartum information. The tool offers quick calculations and detailed fetal growth estimates.

**Highlights:** Patient management, Due date calculation, Gestational age tracking, Postpartum tracking, Quick calculator, Fetal growth estimates, HIPAA compliant passcode lock

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

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to use
- 👍 Convenient
- 👍 Helpful for tracking clients
- 👍 Tracks EDD and age post-birth
- 👍 Records sex and name of baby

**What reviewers complain about**

- 🐛 App stopped working
- 🐛 Only states weeks, not days
- 🐛 Lost records when changing phones
- 🐛 Data sync issues with iPad
- 🐛 Lacks options for notes and customization

**Reported bugs**

- App just stopped working properly
- App stopped working out of nowhere
- Lost all records when changing phones
- Syncing data to iPad is not working
- Dates change erratically when toggling between patients

**Requested features**

- Ability to share data with assistants
- More options for writing notes
- More customizable for practice
- Way to share data with assistants
- Export list to Word or Excel


### ONI DIDI +

[App page](https://appshunter.io/ios/app/oni-didi-plus/id6757947900)

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

**In-app purchases:** none


## Frequently asked questions

### Is Perfect OB Tracker free?

Perfect OB Tracker costs $6.99, with no in-app purchases.

### Is ONI DIDI + free?

ONI DIDI + is free to download, with no in-app purchases.

### Do Perfect OB Tracker or ONI DIDI + have ads?

Neither Perfect OB Tracker nor ONI DIDI + shows ads.

### Which is updated more often, Perfect OB Tracker or ONI DIDI +?

Perfect OB Tracker ships an update every 2 weeks, and ONI DIDI + fortnightly. Most recently, Perfect OB Tracker was updated on October 14, 2026 and ONI DIDI + on October 8, 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.*