# PMI Atom vs MarkBuy

The clearest difference is in-app purchases: PMI Atom at none against MarkBuy's 4. PMI Atom also leads on update cadence (every 5 days vs fortnightly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. MarkBuy sells 4 in-app purchases, starting at $1.99 per month. PMI Atom asks for nothing beyond the download.

PMI Atom ships an update every 5 days, MarkBuy fortnightly. The most recent releases landed on October 27, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | PMI Atom | MarkBuy |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (9 ratings)](https://appshunter.io/ios/app/markbuy/id6745769884/reviews)** |
| Number of ratings | — | **9** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Fortnightly |
| Monetization | — | Free with in-app purchases |
| Size | 23 MB | 56 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Power Monitors, Incorporated](https://appshunter.io/developer/540822326) | [舟 徐](https://appshunter.io/developer/1642105940) |

## What reviewers say

### PMI Atom

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

**In-app purchases:** none


### MarkBuy

[App page](https://appshunter.io/ios/app/markbuy/id6745769884)

Easily track, analyze, and manage all your digital subscriptions in one secure place. Get a clear overview of your spending, receive timely renewal reminders, and gain insights into your financial habits with customizable settings and multi-currency support.

**Highlights:** Comprehensive subscription management, Spending overview and analytics, Calendar renewal reminders, Biometric data protection, Multi-currency support, iCloud sync across devices, Smart app store lookup

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $1.99 | per month |
| Quarterly Subscription | $3.99 | per 3 months |
| Annual Subscription | $6.99 | per year |
| MarkBuy 高级功能 | $6.99 | one-time |


## Frequently asked questions

### Is PMI Atom free?

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

### Is MarkBuy free?

MarkBuy is free to download, with in-app purchases available.

### Do PMI Atom or MarkBuy have ads?

Neither PMI Atom nor MarkBuy shows ads.

### Which is updated more often, PMI Atom or MarkBuy?

PMI Atom ships an update every 5 days, and MarkBuy fortnightly. Most recently, PMI Atom was updated on October 27, 2026 and MarkBuy on October 20, 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.*