# Theta vs ClampMeter

The clearest difference is update cadence: ClampMeter at every 2 months against Theta's every 31 months. ClampMeter also leads on iOS requirement (9.0 vs 14.0). 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.

Theta ships an update every 31 months, ClampMeter every 2 months. The most recent releases landed on October 3, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Theta | ClampMeter |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 31 months | **Every 2 months** |
| Size | 8 MB | 26 MB |
| Requires iOS | 14.0 | **9.0** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Mikhail Fedorov](https://appshunter.io/developer/714735606) | [ZHANGZHOU EASTERN INTELLIGENT METER CO., LTD.](https://appshunter.io/developer/1064839954) |

## What reviewers say

### Theta

[App page](https://appshunter.io/ios/app/theta-meter/id1541332058)

**In-app purchases:** none


### ClampMeter

[App page](https://appshunter.io/ios/app/clampmeter/id6448405311)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Theta free?

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

### Is ClampMeter free?

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

### Do Theta or ClampMeter have ads?

Neither Theta nor ClampMeter shows ads.

### Which is updated more often, Theta or ClampMeter?

Theta ships an update every 31 months, and ClampMeter every 2 months. Most recently, Theta was updated on October 3, 2026 and ClampMeter on October 7, 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.*