# Card Centering Calculator vs DropNotify

The clearest difference is ads: DropNotify at none against Card Centering Calculator's shown. DropNotify also leads on update cadence (every 2 weeks vs monthly) and iOS requirement (16.0 vs 18.0). Card Centering Calculator's advantage is ratings volume (2.5K vs 16) and rating (4.7 vs 4.4). On price, review sentiment, in-app purchases and monetization model there is nothing between them.

Both are free to download. Card Centering Calculator sells 5 one-off in-app purchases 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.

Card Centering Calculator holds the better App Store score, 4.7 against 4.4. That said, the two scores are not equally well evidenced: Card Centering Calculator has 2.5K ratings behind it against 16, so its average is the more settled of the two. Written reviews complicate that: 60% of Card Centering Calculator's written reviews are positive against 63% of DropNotify's, so the app with the better star average is not the one people write more warmly about.

Card Centering Calculator ships an update monthly, DropNotify every 2 weeks. The most recent releases landed on October 19, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Card Centering Calculator | DropNotify |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (2.5K ratings)](https://appshunter.io/ios/app/card-centering-calculator/id6661022837/reviews)** | [4.4 (16 ratings)](https://appshunter.io/ios/app/dropnotify/id6762160323/reviews) |
| Number of ratings | **2.5K** | 16 |
| Positive reviews | 60.3% of reviews | **62.5% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 21 MB | 8 MB |
| Requires iOS | 18.0 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Jade Lizard Software LLC](https://appshunter.io/developer/528029155) | [Brendan Forti](https://appshunter.io/developer/1893174499) |

## What reviewers say

### Card Centering Calculator

[App page](https://appshunter.io/ios/app/card-centering-calculator/id6661022837)

This app helps collectors and traders measure card centering ratios for grading. It uses AI to detect centering or allows manual adjustments for precise measurements, displaying potential grades from major companies.

**Highlights:** AI-powered card centering detection, Manual centering measurement with zoom, Grade comparisons for PSA, BGS, SGC, CGC, TAG, ACE, Front and back side centering measurement, Grading standards reference guide, Off-center visualization tool

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Tip | $0.99 | one-time |
| Medium Tip | $1.99 | one-time |
| Unlock Premium | $4.99 | one-time |
| Large Tip | $4.99 | one-time |
| Pristine Tip | $9.99 | one-time |

**What reviewers like**

- 👍 Intuitive and flexible
- 🚀 Provides great information on centering
- 💡 Helpful for graders and collectors
- 👍 Easy to use and user-friendly
- 👍 Accurate and works as a physical tool

**What reviewers complain about**

- 🐛 Centering measurement doesn't work properly
- 🔒 Grading information locked behind paywall
- 🐛 Camera quality issues, app resets during use

**Reported bugs**

- Centering measurement resets during use
- Image rotation doesn't stay in place

**Requested features**

- Thinner and dashed centering lines for better visibility
- Free access to grading information without subscription


### 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 Card Centering Calculator free?

Card Centering Calculator 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, Card Centering Calculator or DropNotify?

Card Centering Calculator is rated higher. Card Centering Calculator averages 4.7 out of 5 from 2.5K ratings, while DropNotify averages 4.4 from 16 ratings.

### Do Card Centering Calculator or DropNotify have ads?

Card Centering Calculator shows ads; DropNotify does not.

### Which is updated more often, Card Centering Calculator or DropNotify?

Card Centering Calculator ships an update monthly, and DropNotify every 2 weeks. Most recently, Card Centering Calculator was updated on October 19, 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.*