# Smart iMeters vs OhTPMS

The clearest difference is update cadence: OhTPMS at every 3 months against Smart iMeters's every 20 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.

Smart iMeters ships an update every 20 months, OhTPMS every 3 months. The most recent releases landed on September 16, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | Smart iMeters | OhTPMS |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 20 months | **Every 3 months** |
| Size | 29 MB | 102 MB |
| Requires iOS | 15.0 | **14.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Changzhou Haoyi Technology Co.,Ltd.](https://appshunter.io/developer/6775329697) | [Dajia Technology (Shenzhen) Co., Ltd.](https://appshunter.io/developer/1391476924) |

## What reviewers say

### Smart iMeters

[App page](https://appshunter.io/ios/app/smart-imeters/id6450159159)

**Features:** macOS Compatibility

**In-app purchases:** none


### OhTPMS

[App page](https://appshunter.io/ios/app/ohtpms/id6738409904)

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

**In-app purchases:** none


## Frequently asked questions

### Is Smart iMeters free?

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

### Is OhTPMS free?

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

### Do Smart iMeters or OhTPMS have ads?

Neither Smart iMeters nor OhTPMS shows ads.

### Which is updated more often, Smart iMeters or OhTPMS?

Smart iMeters ships an update every 20 months, and OhTPMS every 3 months. Most recently, Smart iMeters was updated on September 16, 2026 and OhTPMS on September 28, 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.*