# PROJOY M vs HERF Battery

The clearest difference is update cadence: HERF Battery at every 2 days against PROJOY M's every 4 months. HERF Battery also leads on iOS requirement (11.0 vs 13.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

PROJOY M ships an update every 4 months, HERF Battery every 2 days. The most recent releases landed on September 17, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | PROJOY M | HERF Battery |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 days** |
| Size | 40 MB | 94 MB |
| Requires iOS | 13.0 | **11.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Projoy Electric Co., Ltd.](https://appshunter.io/developer/1718026915) | [JUAN WANG](https://appshunter.io/developer/1650350517) |

## What reviewers say

### PROJOY M

[App page](https://appshunter.io/ios/app/projoy-m-cloud-v2/id6472881964)

**Features:** macOS Compatibility

**In-app purchases:** none


### HERF Battery

[App page](https://appshunter.io/ios/app/herf-battery/id6476475176)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PROJOY M free?

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

### Is HERF Battery free?

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

### Do PROJOY M or HERF Battery have ads?

Neither PROJOY M nor HERF Battery shows ads.

### Which is updated more often, PROJOY M or HERF Battery?

PROJOY M ships an update every 4 months, and HERF Battery every 2 days. Most recently, PROJOY M was updated on September 17, 2026 and HERF Battery on September 9, 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.*