# Allergy Log vs Tether

The clearest difference is ads: Tether at none against Allergy Log's shown. Allergy Log's advantage is update cadence (every 3 weeks vs every 2 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Allergy Log sells 3 in-app purchases, starting at $3.99 per 7 days and Tether sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Allergy Log ships an update every 3 weeks, Tether every 2 months. The most recent releases landed on September 17, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | Allergy Log | Tether |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (4 ratings)](https://appshunter.io/ios/app/allergy-log-intolerance-diary/id6738300083/reviews)** | — |
| Number of ratings | **4** | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Free with in-app purchases | — |
| Size | 87 MB | 39 MB |
| Requires iOS | 16.6 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [OriginX](https://appshunter.io/developer/1725593771) | [Zachary Lyons](https://appshunter.io/developer/1802738531) |

## What reviewers say

### Allergy Log

[App page](https://appshunter.io/ios/app/allergy-log-intolerance-diary/id6738300083)

Track food reactions and environmental triggers to understand your health better. Log meals, symptoms, and use AI to scan ingredients from photos. Visualize trends with charts and export data for healthcare providers.

**Highlights:** Personalized allergy tracking, Smart food logging, AI ingredient scanning, Bristol Stool Scale integration, Visual data representation, Data export, Customizable themes

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $3.99 | per 7 days |
| Monthly | $12.99 | per month |
| Yearly | $89.99 | per year |


### Tether

[App page](https://appshunter.io/ios/app/tether-sensitivity-tracker/id6759925709)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Tether Premium | $4.99 | per month |
| Tether Premium | $39.99 | per year |
| Tether Premium | $79.99 | one-time |


## Frequently asked questions

### Is Allergy Log free?

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

### Is Tether free?

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

### Do Allergy Log or Tether have ads?

Allergy Log shows ads; Tether does not.

### Which is updated more often, Allergy Log or Tether?

Allergy Log ships an update every 3 weeks, and Tether every 2 months. Most recently, Allergy Log was updated on September 17, 2026 and Tether on September 8, 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.*