# Allergy Diary vs HabitLock

The clearest difference is in-app purchases: Allergy Diary at none against HabitLock's 1. Allergy Diary also leads on ads (none vs shown) and update cadence (daily vs every 5 days). On price and device support there is nothing between them.

Both are free to download. HabitLock sells 1 one-off in-app purchase. Allergy Diary asks for nothing beyond the download.

Allergy Diary ships an update daily, HabitLock every 5 days. The most recent releases landed on October 24, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Allergy Diary | HabitLock |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Daily** | Every 5 days |
| Size | 35 MB | 39 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [HeungYeol Kim](https://appshunter.io/developer/1878087341) | [晓峰 左](https://appshunter.io/developer/1357603673) |

## What reviewers say

### Allergy Diary

[App page](https://appshunter.io/ios/app/allergy-diary-symptom-log/id6762033562)

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

**In-app purchases:** none


### HabitLock

[App page](https://appshunter.io/ios/app/habitlock/id6786512597)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Limited-Time Lifetime Deal | $3.99 | one-time |


## Frequently asked questions

### Is Allergy Diary free?

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

### Is HabitLock free?

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

### Do Allergy Diary or HabitLock have ads?

HabitLock shows ads; Allergy Diary does not.

### Which is updated more often, Allergy Diary or HabitLock?

Allergy Diary ships an update daily, and HabitLock every 5 days. Most recently, Allergy Diary was updated on October 24, 2026 and HabitLock on October 26, 2026.

---

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