Scan & Trace vs Ring Sizer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Scan & Trace
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Scan & Trace is a valuable, time-saving app for pilots and crew. The app enables you to quickly gain access to information about status on suit or to register your suit for service or repairs. Open the app, hover your phone/tablet over the barcode of the suit and you’ll be taken to the VIKING portal.
Ring Sizer
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Ring Sizer makes finding your perfect ring size fast, accurate, and fun, whether you're shopping for an engagement ring, wedding band, or a gift. MEASURE ANY RING OR FINGER • Place a ring on your screen and match the adjustable circle, or use two-point tap for precision • Measure your finger with the on-screen gauge — just slide to fit • Use your camera to scan a ring or finger for hands-free sizing • Auto-calibrated to your device's exact screen PPI for reliable results BROWSE A CURATED RING GALLERY • Explore 30 beautifully crafted rings in gold, rose gold, platinum, silver, and more • Filter by metal type or gemstone, diamond, sapphire, ruby, emerald, morganite, and others • View each ring up close with detailed descriptions AI VIRTUAL TRY-ON • Take a photo of your hand and see any ring from the gallery on your finger • Powered by AI image generation for photorealistic results • The easiest way to visualize a ring before you buy YOUR SIZING VAULT • Save every measurement with date, method, and notes • Compare sizes side by side to track changes over time • Convert instantly between US, UK, EU, JP, CN, and RU ring sizes BUILT FOR ACCURACY • Automatic screen calibration with known device PPI data • Fine-tune calibration manually with a coin or credit card • Confidence indicator shows how reliable each measurement is • Ring width adjustment recommends sizing up for wider bands Ring Sizer is the only ring size app that combines precise measurement tools, an international size converter, a ring gallery, and AI-powered virtual try-on.
Screenshots
Verdict
The clearest difference is in-app purchases: Scan & Trace at none against Ring Sizer's 2. Scan & Trace also leads on device support (3 vs 1) and iOS requirement (9.3 vs 17.0). Ring Sizer's advantage is update cadence (every 6 months vs every 18 months). 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. Ring Sizer sells 2 in-app purchases, starting at $3.99 per 7 days. Scan & Trace asks for nothing beyond the download.
Scan & Trace ships an update every 18 months, Ring Sizer every 6 months. The most recent releases landed on October 25, 2026 and October 28, 2026 respectively.
| Parameter | Scan & Trace | Ring Sizer |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 18 months | Every 6 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 9.3 — better | 17.0 |
| Further details — not scored | ||
| Size | 15 MB | 63 MB |
| Age rating | 4+ | 4+ |
| Developer | Viking Life-saving Equipment AS | APPSURGE |
In-app purchases
Scan & Trace
No in-app purchases
Ring Sizer
- Weekly$3.997 Days
- Annual$44.991 Year









