Proof Authentication vs Centering Check
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Proof Authentication
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.
- Instant product authentication
- Scan Official Proof Security Marks
- High accuracy verification
- Fast results
- Supports selected consumer items
Read full descriptionHide full description
Proof allows you to authenticate the products you buy with unprecedented speed and accuracy. By simply holding the Proof App over any Official Proof Security Mark you will know within seconds that the product you have purchased is 100% authentic. Look for the Proof Security Mark on selected consumer items.
Centering Check
This tool uses AI to accurately measure the centering of trading cards from photos or screenshots. It provides instant grade estimates for major grading companies and allows for manual adjustments and sharing of results. Evaluate online listings and your own collection with confidence.
- AI-powered image correction for accurate centering
- Instant grade estimates for PSA, BGS, CGC, TAG
- Manual border adjustment for precise measurements
- Editable history of all scanned cards
- Front and back centering calculations
- Shareable images with centering data
- Grading standards reference guide
Read full descriptionHide full description
Centering Check is your premium pocket-sized tool for measuring card centering with pixel-perfect precision and getting instant grade estimates. Simply snap a photo or upload a screenshot of an online listing. Instead of worrying about perfect camera angles, our custom AI Warp Method instantly transforms your image into a flat, bird's-eye view, fixing any perspective distortion automatically. You have complete control to ensure absolute accuracy by manually adjusting the borders, giving you a precise look at the card's true centering in seconds. Key Features: ◆ Evaluate Online Listings Instantly: Take a screenshot of any online listing and upload it directly. Our AI Warp Method removes the angle distortion and auto-detects all borders, letting you check if the card has a 10 centering subgrade before you even buy it. ◆ Batch Ranking: Select multiple photos or shoot cards one after another. Every card is measured, saved to your collection log, and ranked by centering in a single pass, so you find the grading candidates immediately. ◆ Pinch-to-Zoom: Zoom in on your card's edges to make pixel-perfect micro-adjustments before finalizing your measurements. ◆ Editable History: Every card you upload is automatically saved. Go back and review, edit, or compare past measurements anytime. ◆ Accurate Grade Estimates: Instantly see estimated centering grades tailored to the specific front and back thresholds of major grading companies: PSA, BGS, CGC and TAG. ◆ Front & Back Support: Easily toggle between front and back calculations to get a complete picture of your card's centering quality. ◆ Share Your Pulls: Generate a sleek, shareable image of your card with its centering measurements and grade estimates overlaid - perfect for sharing with buyers, sellers, or your community. ◆ Grading Standards Reference: A dedicated section with the official centering thresholds for every supported grading company, so you know exactly what each grade requires. ◆ Zero Interruptions: Focus entirely on your card's centering without annoying pop-ups or banners. Stop wondering if your card is worth sending in for grading. Use Centering Check to evaluate your collection, prep your submissions, and buy or sell with confidence. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is review sentiment: Proof Authentication at 50% against Centering Check's 0%. Proof Authentication also leads on in-app purchases (none vs 3). Centering Check's advantage is update cadence (every 2 weeks vs every 2 months) and rating (4.7 vs 4.4). On price and ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Centering Check sells 3 in-app purchases, starting at $3.99 per month. Proof Authentication asks for nothing beyond the download.
Centering Check holds the better App Store score, 4.7 against 4.4. That said, the two scores are not equally well evidenced: Centering Check has 54 ratings behind it against 7, so its average is the more settled of the two. Written reviews complicate that: 50% of Proof Authentication's written reviews are positive against 0% of Centering Check's, so the app with the better star average is not the one people write more warmly about.
Proof Authentication ships an update every 2 months, Centering Check every 2 weeks. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.
| Parameter | Proof Authentication | Centering Check |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (7 ratings) | 4.7 (54 ratings) — better |
| Positive reviews | 50.0% of reviews — better | 0.0% of reviews |
| Number of ratings | 7 | 54 — better |
| Update frequency | Every 2 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 75 MB | 47 MB |
| Age rating | 4+ | 4+ |
| Developer | Proof Authentication Corporation | Giosue Castellano |
Customer experience
Proof Authentication
Centering Check
In-app purchases
Proof Authentication
No in-app purchases
Centering Check
- Monthly Centering Check PRO1 Month trial$3.991 Month
- Yearly Centering Check PRO$39.991 Year
- Lifetime Subscription PRO$99.99
Questions
Is Proof Authentication free?
Is Centering Check free?
Which has better reviews, Proof Authentication or Centering Check?
Do Proof Authentication or Centering Check have ads?
Which is updated more often, Proof Authentication or Centering Check?
Other comparisons
