# AcidLog vs Runny day

The clearest difference is update cadence: Runny day at every 5 days against AcidLog's every 3 weeks. AcidLog's advantage is device support (3 vs 1) and iOS requirement (15.1 vs 17.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. AcidLog sells 2 in-app purchases, starting at $4.99 per month and Runny day sells 2 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

AcidLog ships an update every 3 weeks, Runny day every 5 days. Both last shipped on October 31, 2026.

## The numbers

| Metric | AcidLog | Runny day |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/acidlog-reflux-trigger-diary/id6790413892/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 5 days** |
| Monetization | Freemium | — |
| Size | 45 MB | 23 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [DJUMP, MB](https://appshunter.io/developer/1861303154) | [Ivan Dotsenko](https://appshunter.io/developer/551628923) |

## What reviewers say

### AcidLog

[App page](https://appshunter.io/ios/app/acidlog-reflux-trigger-diary/id6790413892)

This app helps you identify personal acid reflux triggers by logging meals and symptoms. It uses an on-device engine to correlate foods with your reported discomfort, providing a ranked list of likely culprits. Focus on what bothers you, not generic avoidance lists.

**Highlights:** Log meals and rate symptoms, On-device correlation engine, Personalized trigger list, Offline logging capability, Doctor-ready PDF reports, No advertisements

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $4.99 | per month |
| Premium Annual | $39.99 | per year |


### Runny day

[App page](https://appshunter.io/ios/app/runny-day-allergy-tracker/id6806360953)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Weekly | $2.99 | per 7 days |
| Premium Lifetime | $59.99 | one-time |


## Frequently asked questions

### Is AcidLog free?

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

### Is Runny day free?

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

### Do AcidLog or Runny day have ads?

Neither AcidLog nor Runny day shows ads.

### Which is updated more often, AcidLog or Runny day?

AcidLog ships an update every 3 weeks, and Runny day every 5 days. Most recently, AcidLog was updated on October 31, 2026 and Runny day on October 31, 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.*