# Haidy App vs Holter Log

The clearest difference is price: Haidy App at Free against Holter Log's $0.99. On update cadence, ads, in-app purchases and device support there is nothing between them.

Haidy App is free to download; Holter Log costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Haidy App ships an update weekly, Holter Log every 2 weeks. Both last shipped on October 24, 2026.

## The numbers

| Metric | Haidy App | Holter Log |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Every 2 weeks |
| Monetization | — | Paid |
| Size | 54 MB | 15 MB |
| Requires iOS | **16.4** | 17.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Apple Watch** |
| Age rating | 17+ | 4+ |
| Developer | [44ai AG](https://appshunter.io/developer/1792828250) | [GEORGE N LOPOYDA](https://appshunter.io/developer/1778027628) |

## What reviewers say

### Haidy App

[App page](https://appshunter.io/ios/app/haidy-app/id6502825155)

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

**In-app purchases:** none


### Holter Log

[App page](https://appshunter.io/ios/app/holter-log/id6761610828)

Easily record symptoms, activities, and other events during a Holter monitor study. Log entries quickly from your iPhone or Apple Watch to create a detailed diary that matches your monitor data, simplifying your medical handoff.

**Highlights:** Quickly log symptoms and activities, Use Apple Watch for on-the-go logging, Add custom event entries, Edit or delete entries, Review event timeline, Group logs by study week, Export and share logs

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Haidy App free?

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

### Is Holter Log free?

Holter Log costs $0.99, with no in-app purchases.

### Do Haidy App or Holter Log have ads?

Neither Haidy App nor Holter Log shows ads.

### Which is updated more often, Haidy App or Holter Log?

Haidy App ships an update weekly, and Holter Log every 2 weeks. Most recently, Haidy App was updated on October 24, 2026 and Holter Log on October 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*