# Card Centering & Grading Tool vs Caliper 卡牌居中检测

The clearest difference is rating: Caliper 卡牌居中检测 at 5.0 against Card Centering & Grading Tool's 4.2. Caliper 卡牌居中检测 also leads on in-app purchases (none vs 4) and iOS requirement (15.0 vs 18.0). Card Centering & Grading Tool's advantage is ratings volume (13 vs 1). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Card Centering & Grading Tool sells 4 in-app purchases, starting at $3.99 per 7 days. Caliper 卡牌居中检测 asks for nothing beyond the download.

Caliper 卡牌居中检测 holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: Card Centering & Grading Tool has 13 ratings behind it against 1, so its average is the more settled of the two.

Card Centering & Grading Tool ships an update monthly, Caliper 卡牌居中检测 fortnightly. The most recent releases landed on October 22, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Card Centering & Grading Tool | Caliper 卡牌居中检测 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (13 ratings)](https://appshunter.io/ios/app/card-centering-and-grading-tool/id6751225884/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/caliper/id6812656442/reviews)** |
| Number of ratings | **13** | 1 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Fortnightly** |
| Monetization | Freemium | **Free** |
| Size | 16 MB | 31 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [WarthogLab](https://appshunter.io/developer/890415554) | [GoHiMicroElectronics Co., Ltd.](https://appshunter.io/developer/1803914071) |

## What reviewers say

### Card Centering & Grading Tool

[App page](https://appshunter.io/ios/app/card-centering-and-grading-tool/id6751225884)

This app uses AI and manual tools to precisely evaluate trading and sports cards for professional grading standards. It calculates centering ratios and predicts potential scores from top grading companies, supporting various card types like Pokémon, Magic: The Gathering, and sports cards.

**Highlights:** AI-powered centering analysis, Manual precision measurement tools, Grading company score prediction, Front and back centering evaluation, Universal card type support, Customizable detection settings

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gradeon Weekly Pro | $3.99 | per 7 days |
| Gradeon Weekly Pro | $3.99 | per 7 days |
| Gradeon Annual Pro | $19.99 | per year |
| Gradeon Annual Pro | $19.99 | per year |


### Caliper 卡牌居中检测

[App page](https://appshunter.io/ios/app/caliper/id6812656442)

This app helps trading card collectors measure card centering before grading. It uses your device's camera to analyze card corners and print alignment, providing centering percentages and estimated grading scores for major services. Save, share, and access card resources.

**Highlights:** Real-time perspective correction preview, Precise print alignment reference lines, Displays centering percentages, Estimates PSA, CGC, BGS scores, Supports various zoom and fine-tuning methods, Save and share measurement results, Card resources and illustrator information

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

**In-app purchases:** none


## Frequently asked questions

### Is Card Centering & Grading Tool free?

Card Centering & Grading Tool is free to download, with in-app purchases available.

### Is Caliper 卡牌居中检测 free?

Caliper 卡牌居中检测 is free to download, with no in-app purchases.

### Which has better reviews, Card Centering & Grading Tool or Caliper 卡牌居中检测?

Caliper 卡牌居中检测 is rated higher. Card Centering & Grading Tool averages 4.2 out of 5 from 13 ratings, while Caliper 卡牌居中检测 averages 5.0 from 1 ratings.

### Do Card Centering & Grading Tool or Caliper 卡牌居中检测 have ads?

Neither Card Centering & Grading Tool nor Caliper 卡牌居中检测 shows ads.

### Which is updated more often, Card Centering & Grading Tool or Caliper 卡牌居中检测?

Card Centering & Grading Tool ships an update monthly, and Caliper 卡牌居中检测 fortnightly. Most recently, Card Centering & Grading Tool was updated on October 22, 2026 and Caliper 卡牌居中检测 on October 26, 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.*