# Source vs Zone 2

The clearest difference is update cadence: Zone 2 at every 4 days against Source's fortnightly. Source's advantage is iOS requirement (15.1 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Source sells 3 in-app purchases, starting at $7.99 per month and Zone 2 sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Source ships an update fortnightly, Zone 2 every 4 days. The most recent releases landed on October 16, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Source | Zone 2 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 4 days** |
| Size | 62 MB | 17 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Age rating | 4+ | 12+ |
| Developer | [CHANG-WEI FU](https://appshunter.io/developer/1837600448) | [JIYULMOM](https://appshunter.io/developer/379186743) |

## What reviewers say

### Source

[App page](https://appshunter.io/ios/app/source-ai-copilot/id6756547151)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Source Pro (月費) | $7.99 | per month |
| Source Pro (年費) | $49.99 | per year |
| Source Pro 創始會員 | $99.99 | one-time |


### Zone 2

[App page](https://appshunter.io/ios/app/zone-2-heart-rate-trainer/id6762046665)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Zone 2 tracking 2 Monthly | $4.99 | per month |
| Zone tracking 2 Annual | $29.99 | per year |
| Zone 2 Lifetime | $49.99 | one-time |


## Frequently asked questions

### Is Source free?

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

### Is Zone 2 free?

Zone 2 is free to download, with in-app purchases available.

### Do Source or Zone 2 have ads?

Neither Source nor Zone 2 shows ads.

### Which is updated more often, Source or Zone 2?

Source ships an update fortnightly, and Zone 2 every 4 days. Most recently, Source was updated on October 16, 2026 and Zone 2 on October 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.*