# PMI Atom vs Concentric Neutral Calculator

The clearest difference is update cadence: PMI Atom at every 5 days against Concentric Neutral Calculator's every 7 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.

PMI Atom ships an update every 5 days, Concentric Neutral Calculator every 7 months. The most recent releases landed on September 8, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | PMI Atom | Concentric Neutral Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 7 months |
| Size | 23 MB | 5 MB |
| Requires iOS | **16.0** | 16.6 |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Power Monitors, Incorporated](https://appshunter.io/developer/540822326) | [Southwire Company](https://appshunter.io/developer/440338423) |

## What reviewers say

### PMI Atom

[App page](https://appshunter.io/ios/app/pmi-atom/id6451215869)

**In-app purchases:** none


### Concentric Neutral Calculator

[App page](https://appshunter.io/ios/app/concentric-neutral-calculator/id6478878772)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PMI Atom free?

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

### Is Concentric Neutral Calculator free?

Concentric Neutral Calculator is free to download, with no in-app purchases.

### Do PMI Atom or Concentric Neutral Calculator have ads?

Neither PMI Atom nor Concentric Neutral Calculator shows ads.

### Which is updated more often, PMI Atom or Concentric Neutral Calculator?

PMI Atom ships an update every 5 days, and Concentric Neutral Calculator every 7 months. Most recently, PMI Atom was updated on September 8, 2026 and Concentric Neutral Calculator on September 19, 2026.

---

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