# 口袋图鉴 vs Caliper 卡牌居中检测

The clearest difference is ratings volume: 口袋图鉴 at 7 against Caliper 卡牌居中检测's 1. On price, rating, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for 口袋图鉴 against 5.0 for Caliper 卡牌居中检测. That said, the two scores are not equally well evidenced: 口袋图鉴 has 7 ratings behind it against 1, so its average is the more settled of the two.

口袋图鉴 ships an update every 2 weeks, Caliper 卡牌居中检测 fortnightly. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | 口袋图鉴 | Caliper 卡牌居中检测 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (7 ratings)](https://appshunter.io/ios/app/id6755204960/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/caliper/id6812656442/reviews) |
| Number of ratings | **7** | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Fortnightly |
| Monetization | — | Free |
| Size | 235 MB | 31 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [南京瞬息科技有限公司](https://appshunter.io/developer/1852586550) | [GoHiMicroElectronics Co., Ltd.](https://appshunter.io/developer/1803914071) |

## What reviewers say

### 口袋图鉴

[App page](https://appshunter.io/ios/app/id6755204960)

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

**In-app purchases:** none


### 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 口袋图鉴 free?

口袋图鉴 is free to download, with no in-app purchases.

### 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, 口袋图鉴 or Caliper 卡牌居中检测?

口袋图鉴 and Caliper 卡牌居中检测 are both rated 5.0 out of 5 on the App Store, from 7 and 1 ratings respectively.

### Do 口袋图鉴 or Caliper 卡牌居中检测 have ads?

Neither 口袋图鉴 nor Caliper 卡牌居中检测 shows ads.

### Which is updated more often, 口袋图鉴 or Caliper 卡牌居中检测?

口袋图鉴 ships an update every 2 weeks, and Caliper 卡牌居中检测 fortnightly. Most recently, 口袋图鉴 was updated on November 5, 2026 and Caliper 卡牌居中检测 on October 31, 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.*