# Proof Authentication vs CardCalc

The clearest difference is in-app purchases: Proof Authentication at none against CardCalc's 4. Proof Authentication also leads on iOS requirement (14.4 vs 17.0). CardCalc's advantage is review sentiment (83% vs 50%) and update cadence (every 2 weeks vs every 2 months). On price, rating, ads and device support there is nothing between them.

Both are free to download. CardCalc sells 4 in-app purchases, starting at $3.99 per month. Proof Authentication asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.4 for Proof Authentication against 4.5 for CardCalc. Both are backed by a comparable volume of ratings — 7 and 31 respectively. Written reviews are what separate them: 50% of Proof Authentication's written reviews are positive against 83% of CardCalc's.

Proof Authentication ships an update every 2 months, CardCalc every 2 weeks. The most recent releases landed on September 8, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Proof Authentication | CardCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (7 ratings)](https://appshunter.io/ios/app/proof-authentication/id1589988080/reviews) | **[4.5 (31 ratings)](https://appshunter.io/ios/app/cardcalc-tcg-calculator/id6752672423/reviews)** |
| Number of ratings | 7 | **31** |
| Positive reviews | 50.0% of reviews | **83.3% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 76 MB | 60 MB |
| Requires iOS | **14.4** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Proof Authentication Corporation](https://appshunter.io/developer/1604240795) | [CardCalc LLC](https://appshunter.io/developer/1840252450) |

## What reviewers say

### Proof Authentication

[App page](https://appshunter.io/ios/app/proof-authentication/id1589988080)

Verify product authenticity instantly by scanning official security marks. Ensure your purchases are genuine with rapid and accurate authentication. Look for the Proof Security Mark on select consumer goods.

**Highlights:** Instant product authentication, Scan Official Proof Security Marks, High accuracy verification, Fast results, Supports selected consumer items

**In-app purchases:** none


### CardCalc

[App page](https://appshunter.io/ios/app/cardcalc-tcg-calculator/id6752672423)

Instantly calculate buy, sell, and trade values for trading cards. Offers simple and advanced modes for quick checks or detailed record-keeping. Supports multiple currencies and includes a dark mode option.

**Highlights:** Buy/Sell calculator with Trade % and Cash %, Credit-to-Cash converter, Unlimited entry saving, Item labels for organization, Real-time difference calculations, Multiple currency support, Dark mode

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CardCalc Pro Monthly | $3.99 | per month |
| CardCalc Pro – 3 Month Access | $5.99 | per 3 months |
| CardCalc Pro Yearly | $29.99 | per year |
| CardCalc Pro | $5.99 | one-time |


## Frequently asked questions

### Is Proof Authentication free?

Proof Authentication is free to download, with no in-app purchases.

### Is CardCalc free?

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

### Which has better reviews, Proof Authentication or CardCalc?

CardCalc is rated higher. Proof Authentication averages 4.4 out of 5 from 7 ratings, while CardCalc averages 4.5 from 31 ratings.

### Do Proof Authentication or CardCalc have ads?

Neither Proof Authentication nor CardCalc shows ads.

### Which is updated more often, Proof Authentication or CardCalc?

Proof Authentication ships an update every 2 months, and CardCalc every 2 weeks. Most recently, Proof Authentication was updated on September 8, 2026 and CardCalc on September 20, 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.*