# Tether vs AIP Diet Tracker

The clearest difference is iOS requirement: Tether at 15.1 against AIP Diet Tracker's 18. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Tether sells 3 in-app purchases, starting at $4.99 per month and AIP Diet Tracker sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Tether ships an update every 2 months, AIP Diet Tracker monthly. The most recent releases landed on September 8, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Tether | AIP Diet Tracker |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Size | 39 MB | 11 MB |
| Requires iOS | **15.1** | 18 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Zachary Lyons](https://appshunter.io/developer/1802738531) | [Karol Jaworski](https://appshunter.io/developer/1799974477) |

## What reviewers say

### 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 |


### AIP Diet Tracker

[App page](https://appshunter.io/ios/app/aip-diet-tracker-calm/id6761670521)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Calm Pro | $4.99 | per month |
| Calm Pro | $39.99 | per year |
| Calm Pro | $39.99 | per year |


## Frequently asked questions

### Is Tether free?

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

### Is AIP Diet Tracker free?

AIP Diet Tracker is free to download, with in-app purchases available.

### Do Tether or AIP Diet Tracker have ads?

Neither Tether nor AIP Diet Tracker shows ads.

### Which is updated more often, Tether or AIP Diet Tracker?

Tether ships an update every 2 months, and AIP Diet Tracker monthly. Most recently, Tether was updated on September 8, 2026 and AIP Diet Tracker on September 20, 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.*