# Onomy vs Headrest

The clearest difference is in-app purchases: Onomy at none against Headrest's 5. Headrest's advantage is update cadence (every 10 days vs every 5 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Headrest sells 5 in-app purchases, starting at $7.99 per month. Onomy asks for nothing beyond the download.

Onomy ships an update every 5 weeks, Headrest every 10 days. The most recent releases landed on October 25, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Onomy | Headrest |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/headrest-migraine-tracker/id6813458141/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 10 days** |
| Monetization | — | Freemium |
| Size | 117 MB | 65 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Onomy Castillo SRL](https://appshunter.io/developer/1841840462) | [Evolui AB](https://appshunter.io/developer/1530413649) |

## What reviewers say

### Onomy

[App page](https://appshunter.io/ios/app/onomy/id6752937486)

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

**In-app purchases:** none


### Headrest

[App page](https://appshunter.io/ios/app/headrest-migraine-tracker/id6813458141)

This app forecasts migraine risk based on barometric pressure changes and your personal history. It allows quick logging of attacks and detailed tracking of potential triggers and medication effectiveness. Your data is stored locally, ensuring privacy.

**Highlights:** Barometric pressure forecast, Daily and weekly risk levels, Evening alerts for high-risk days, Quick attack logging, Trigger and medication tracking, Local data storage

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $7.99 | per month |
| Pro Annual Offer | $19.99 | per year |
| Pro Annual | $39.99 | per year |
| Pro Annual | $39.99 | per year |
| Pro Annual | $49.99 | per year |


## Frequently asked questions

### Is Onomy free?

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

### Is Headrest free?

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

### Do Onomy or Headrest have ads?

Neither Onomy nor Headrest shows ads.

### Which is updated more often, Onomy or Headrest?

Onomy ships an update every 5 weeks, and Headrest every 10 days. Most recently, Onomy was updated on October 25, 2026 and Headrest on October 26, 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.*