# ISME Microbes vs HERD SD

The clearest difference is update cadence: HERD SD at every 2 days against ISME Microbes's every 5 months. 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.

ISME Microbes ships an update every 5 months, HERD SD every 2 days. The most recent releases landed on June 22, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | ISME Microbes | HERD SD |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 days** |
| Size | 82 MB | 33 MB |
| Requires iOS | **13.4** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [International Society for Microbial Ecology](https://appshunter.io/developer/1394492884) | [Grazielle Cioletti](https://appshunter.io/developer/1825411960) |

## What reviewers say

### ISME Microbes

[App page](https://appshunter.io/ios/app/isme-microbes/id1394492885)

**Features:** macOS Compatibility

**In-app purchases:** none


### HERD SD

[App page](https://appshunter.io/ios/app/herd-sd/id6748356498)

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

**In-app purchases:** none


## Frequently asked questions

### Is ISME Microbes free?

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

### Is HERD SD free?

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

### Do ISME Microbes or HERD SD have ads?

Neither ISME Microbes nor HERD SD shows ads.

### Which is updated more often, ISME Microbes or HERD SD?

ISME Microbes ships an update every 5 months, and HERD SD every 2 days. Most recently, ISME Microbes was updated on June 22, 2026 and HERD SD on September 10, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*