# ISA Cert Validator vs Card Centering Calculator

The clearest difference is in-app purchases: ISA Cert Validator at none against Card Centering Calculator's 5. ISA Cert Validator also leads on ads (none vs shown) and rating (5.0 vs 4.7). Card Centering Calculator's advantage is update cadence (every 3 weeks vs every 43 months) and ratings volume (2.3K vs 7). On price and device support there is nothing between them.

Both are free to download. Card Centering Calculator sells 5 one-off in-app purchases. ISA Cert Validator asks for nothing beyond the download.

ISA Cert Validator holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Card Centering Calculator has 2.3K ratings behind it against 7, so its average is the more settled of the two.

ISA Cert Validator ships an update every 43 months, Card Centering Calculator every 3 weeks. The most recent releases landed on July 18, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | ISA Cert Validator | Card Centering Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (7 ratings)](https://appshunter.io/ios/app/isa-cert-validator/id1663513607/reviews)** | [4.7 (2.3K ratings)](https://appshunter.io/ios/app/card-centering-calculator/id6661022837/reviews) |
| Number of ratings | 7 | **2.3K** |
| Positive reviews | — | 60.5% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 43 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 1 MB | 18 MB |
| Requires iOS | **15.5** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | +4 |
| Developer | [Darryl Polo](https://appshunter.io/developer/1663513609) | [Jade Lizard Software LLC](https://appshunter.io/developer/528029155) |

## What reviewers say

### ISA Cert Validator

[App page](https://appshunter.io/ios/app/isa-cert-validator/id1663513607)

Instantly verify the authenticity of graded sports and trading cards. Scan a QR code or enter a serial number to access details like year, set, grade, and population.

**Highlights:** Verify card authenticity, Scan QR codes on labels, Search by serial number, View card details (year, set, grade), Check population totals

**In-app purchases:** none


### 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


## Frequently asked questions

### Is ISA Cert Validator free?

ISA Cert Validator is free to download, with no in-app purchases.

### Is Card Centering Calculator free?

Card Centering Calculator is free to download, with in-app purchases available.

### Which has better reviews, ISA Cert Validator or Card Centering Calculator?

ISA Cert Validator is rated higher. ISA Cert Validator averages 5.0 out of 5 from 7 ratings, while Card Centering Calculator averages 4.7 from 2.3K ratings.

### Do ISA Cert Validator or Card Centering Calculator have ads?

Card Centering Calculator shows ads; ISA Cert Validator does not.

### Which is updated more often, ISA Cert Validator or Card Centering Calculator?

ISA Cert Validator ships an update every 43 months, and Card Centering Calculator every 3 weeks. Most recently, ISA Cert Validator was updated on July 18, 2026 and Card Centering Calculator on September 27, 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.*