# HeadFast™ vs Undertone

The clearest difference is update cadence: HeadFast™ at weekly against Undertone's monthly. HeadFast™ also leads on device support (3 vs 1) and iOS requirement (15.6 vs 17.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. HeadFast™ sells 2 in-app purchases, starting at $9.99 per month and Undertone sells 2 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

HeadFast™ ships an update weekly, Undertone monthly. The most recent releases landed on October 31, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | HeadFast™ | Undertone |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (7 ratings)](https://appshunter.io/ios/app/headfast-stop-overthinking/id6769825532/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Monthly |
| Monetization | Free with in-app purchases | — |
| Size | 72 MB | 16 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 12+ | 9+ |
| Developer | [DecideFast LLC](https://appshunter.io/developer/1811491351) | [Fernix LLC](https://appshunter.io/developer/6785233330) |

## What reviewers say

### HeadFast™

[App page](https://appshunter.io/ios/app/headfast-stop-overthinking/id6769825532)

This app helps users break free from repetitive thoughts and overthinking. Simply type what's on your mind, and receive a concise response to help you move on faster. It's designed for everyday mental loops, not crisis situations.

**Highlights:** Type and receive instant responses, Break free from repetitive thoughts, Overcome indecision quickly, No setup or lengthy routines, Focus on reality checks, not advice

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited Hits | $9.99 | per month |
| Get unlimited hits | $39.99 | per year |


### Undertone

[App page](https://appshunter.io/ios/app/undertone-ai-chat-analyzer/id6792533974)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Undertone Premium Weekly | $4.99 | per 7 days |
| Undertone Premium  Yearly | $29.99 | per year |


## Frequently asked questions

### Is HeadFast™ free?

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

### Is Undertone free?

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

### Do HeadFast™ or Undertone have ads?

Neither HeadFast™ nor Undertone shows ads.

### Which is updated more often, HeadFast™ or Undertone?

HeadFast™ ships an update weekly, and Undertone monthly. Most recently, HeadFast™ was updated on October 31, 2026 and Undertone on October 25, 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.*