# P.M.M.D Calculator vs HGsmart

The clearest difference is price: HGsmart at Free against P.M.M.D Calculator's $3.99. HGsmart also leads on update cadence (every 6 weeks vs every 22 months) and rating (1.3 vs 1.0). P.M.M.D Calculator's advantage is iOS requirement (13 vs 15.6). On ads, in-app purchases and device support there is nothing between them.

HGsmart is free to download; P.M.M.D Calculator costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

HGsmart holds the better App Store score, 1.3 against 1.0. That said, the two scores are not equally well evidenced: HGsmart has 14 ratings behind it against 1, so its average is the more settled of the two.

P.M.M.D Calculator ships an update every 22 months, HGsmart every 6 weeks. Both last shipped on October 30, 2026.

## The numbers

| Metric | P.M.M.D Calculator | HGsmart |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/pmmd-calculator/id1631470538/reviews) | **[1.3 (14 ratings)](https://appshunter.io/ios/app/hgsmart/id6469405928/reviews)** |
| Number of ratings | 1 | **14** |
| Positive reviews | — | 22.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 22 months | **Every 6 weeks** |
| Monetization | — | Free |
| Size | 1 MB | 130 MB |
| Requires iOS | **13** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Heng Jia Liang](https://appshunter.io/developer/1532000635) | [Shenzhen Tahao Technology Co., Ltd.](https://appshunter.io/developer/6776085901) |

## What reviewers say

### P.M.M.D Calculator

[App page](https://appshunter.io/ios/app/pmmd-calculator/id1631470538)

**Features:** macOS Compatibility

**In-app purchases:** none


### HGsmart

[App page](https://appshunter.io/ios/app/hgsmart/id6469405928)

This app connects with smart pet products to offer comprehensive care solutions. It allows remote control of devices, customization of settings, and real-time monitoring of your pet's health and routine.

**Highlights:** Remote device operation, Customizable working modes, Real-time device monitoring, Pet health data recording, User-friendly interface

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

**In-app purchases:** none

**What reviewers like**

- 👍 Simple and clean app interface
- 🚀 Loads quickly
- 💡 Ability to add a meal call for cats
- 👍 Works well once set up
- 👍 No subscription required

**What reviewers complain about**

- 🐛 Frequent login issues
- 🐛 App stops working entirely
- 🐛 Chinese error messages
- 🐛 WiFi connection problems (password length)
- 🐛 Inability to register or create accounts

**Reported bugs**

- Cannot log in
- Account does not exist error
- Email not correct error during registration
- WiFi only accepts 5 character passwords
- No notifications for feed distribution

**Requested features**

- Notification when feed is distributed
- Fix login issues
- Fix registration issues
- Fix WiFi connection issues
- Fix Chinese error messages


## Frequently asked questions

### Is P.M.M.D Calculator free?

P.M.M.D Calculator costs $3.99, with no in-app purchases.

### Is HGsmart free?

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

### Which has better reviews, P.M.M.D Calculator or HGsmart?

HGsmart is rated higher. P.M.M.D Calculator averages 1.0 out of 5 from 1 ratings, while HGsmart averages 1.3 from 14 ratings.

### Do P.M.M.D Calculator or HGsmart have ads?

Neither P.M.M.D Calculator nor HGsmart shows ads.

### Which is updated more often, P.M.M.D Calculator or HGsmart?

P.M.M.D Calculator ships an update every 22 months, and HGsmart every 6 weeks. Most recently, P.M.M.D Calculator was updated on October 30, 2026 and HGsmart on October 30, 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.*