# Polyphasic Sleep Tracker vs Heart Zoo

The clearest difference is price: Heart Zoo at Free against Polyphasic Sleep Tracker's $2.49. Heart Zoo also leads on rating (5.0 vs 3.6) and review sentiment (100% vs 63%). Polyphasic Sleep Tracker's advantage is in-app purchases (none vs 3) and ratings volume (5 vs 1). On ads and device support there is nothing between them.

Heart Zoo is free to download; Polyphasic Sleep Tracker costs $2.49 up front. Heart Zoo sells 3 in-app purchases, starting at $0.99 per month. Polyphasic Sleep Tracker asks for nothing beyond the download.

Heart Zoo holds the better App Store score, 5.0 against 3.6. That said, the two scores are not equally well evidenced: Polyphasic Sleep Tracker has 5 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 63% of Polyphasic Sleep Tracker's written reviews are positive against 100% of Heart Zoo's.

Polyphasic Sleep Tracker ships an update every 7 months, Heart Zoo every 3 days. The most recent releases landed on October 14, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Polyphasic Sleep Tracker | Heart Zoo |
| --- | --- | --- |
| Price | $2.49 | **Free** |
| Rating | [3.6 (5 ratings)](https://appshunter.io/ios/app/polyphasic-sleep-tracker/id6449134102/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/heart-zoo-mood-journal/id6757285713/reviews)** |
| Number of ratings | **5** | 1 |
| Positive reviews | 62.5% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 2 MB | 21 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [FiveSheep OU](https://appshunter.io/developer/1725654318) | [小祯 汪](https://appshunter.io/developer/1164848834) |

## What reviewers say

### Polyphasic Sleep Tracker

[App page](https://appshunter.io/ios/app/polyphasic-sleep-tracker/id6449134102)

This app helps you master polyphasic sleep schedules to optimize your waking hours. It offers customizable plans, smart reminders, and HealthKit integration to track and adjust your sleep patterns.

**Highlights:** Customizable sleep plans, Smart sleep reminders, HealthKit integration, Dark mode, Multiple sleep schedule options

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

**In-app purchases:** none


### Heart Zoo

[App page](https://appshunter.io/ios/app/heart-zoo-mood-journal/id6757285713)

Express your feelings in letters to virtual animal friends who offer personalized, understanding responses. Track your emotional patterns with visualizations and revisit past entries in a private, calming sanctuary.

**Highlights:** Write letters to 7 unique animal personalities, Receive personalized AI-driven replies, Track emotional patterns with visualizations, Time capsule for revisiting past entries, Judgment-free emotional sanctuary, Calming and beautiful interface

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Guardian Pass | $0.99 | per month |
| Guardian Pass Semi-Yearly | $3.99 | per 6 months |
| Guardian Pass | $7.99 | per year |


## Frequently asked questions

### Is Polyphasic Sleep Tracker free?

Polyphasic Sleep Tracker costs $2.49, with no in-app purchases.

### Is Heart Zoo free?

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

### Which has better reviews, Polyphasic Sleep Tracker or Heart Zoo?

Heart Zoo is rated higher. Polyphasic Sleep Tracker averages 3.6 out of 5 from 5 ratings, while Heart Zoo averages 5.0 from 1 ratings.

### Do Polyphasic Sleep Tracker or Heart Zoo have ads?

Neither Polyphasic Sleep Tracker nor Heart Zoo shows ads.

### Which is updated more often, Polyphasic Sleep Tracker or Heart Zoo?

Polyphasic Sleep Tracker ships an update every 7 months, and Heart Zoo every 3 days. Most recently, Polyphasic Sleep Tracker was updated on October 14, 2026 and Heart Zoo on October 25, 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.*