# Centering50 vs DropNotify

Centering50 and DropNotify both sit at 4.4 stars, but that hides the real split: 63% of DropNotify's written reviews are positive against 0% of Centering50's. DropNotify also leads on ads (none vs shown). On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. Centering50 sells 3 in-app purchases, starting at $4.99 per month and DropNotify sells 1 in-app purchase, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.4 for Centering50 against 4.4 for DropNotify. Both are backed by a comparable volume of ratings — 28 and 16 respectively. Written reviews are what separate them: 0% of Centering50's written reviews are positive against 63% of DropNotify's.

Centering50 ships an update every 8 days, DropNotify every 2 weeks. The most recent releases landed on October 6, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Centering50 | DropNotify |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (28 ratings)](https://appshunter.io/ios/app/centering50-card-grading-tool/id6759667301/reviews) | [4.4 (16 ratings)](https://appshunter.io/ios/app/dropnotify/id6762160323/reviews) |
| Number of ratings | **28** | 16 |
| Positive reviews | 0.0% of reviews | **62.5% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 8 days** | Every 2 weeks |
| Monetization | Free with in-app purchases | Freemium |
| Size | 155 MB | 8 MB |
| Requires iOS | 16.2 | **16.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 17+ | 4+ |
| Developer | [FUK WAI LI](https://appshunter.io/developer/1880074668) | [Brendan Forti](https://appshunter.io/developer/1893174499) |

## What reviewers say

### Centering50

[App page](https://appshunter.io/ios/app/centering50-card-grading-tool/id6759667301)

This tool helps collectors accurately measure card centering ratios for TCG and sports cards. It uses AI-assisted scanning and manual guides to provide precise measurements, helping users predict grades and save on submission fees.

**Highlights:** AI-assisted border detection, Manual measurement guides, Front and back analysis, 15x precision zoom, Grading standard library, Dynamic contrast adjustment

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited Monthly | $4.99 | per month |
| Unlimited Yearly | $24.99 | per year |
| Full Version Lifetime Access | $49.99 | one-time |


### DropNotify

[App page](https://appshunter.io/ios/app/dropnotify/id6762160323)

Get instant notifications when popular retailers restock desired items. Track product availability online and in-store for collectibles, deals, and more. Offers both free and premium subscription tiers for enhanced features.

**Highlights:** Real-time push notifications, Online and in-store restock tracking, Support for major retailers, Track collectibles and deals, Free and premium subscription options, Local restock maps

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DropNotify Premium | $9.99 | per month |


## Frequently asked questions

### Is Centering50 free?

Centering50 is free to download, with in-app purchases available.

### Is DropNotify free?

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

### Which has better reviews, Centering50 or DropNotify?

Centering50 and DropNotify are both rated 4.4 out of 5 on the App Store, from 28 and 16 ratings respectively.

### Do Centering50 or DropNotify have ads?

Centering50 shows ads; DropNotify does not.

### Which is updated more often, Centering50 or DropNotify?

Centering50 ships an update every 8 days, and DropNotify every 2 weeks. Most recently, Centering50 was updated on October 6, 2026 and DropNotify on October 9, 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.*