Comparison

Dornheim 3D Scanner vs Ring Sizer

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Dornheim 3D Scanner

Features
Read full description

Dornheim 3D Scanner uses the FaceID camera to take true-to-scale 3D photos in order to carry out a wide variety of measurements. Measurements of lengths, distances, angles, surfaces, diameters, circumferences and volumes are possible. The dimensions can be determined both directly in 3D space and along the surface. Volumes can also be determined from elevations and depressions. The 3D photos and measurements can be imported and exported using various formats, including the SEG format of the Dornheim Segmenter. APPLICATION With Dornheim 3D Scanner you can quickly and easily - Capture 3D photos to scale - Measure 3D photos to scale without tools - Import and export 3D photos and measurements - Create 3D photos and measurements for Dornheim Segmenter and Dornheim Real Anatomy HIGHLIGHTS - Measure lengths, distances, angles, surfaces, diameters, circumferences, volumes - Determine the volume of elevations and depressions - Perform measurements both in 3D space and on surfaces - Export to SEG, STL, OBJ, PLY - Available languages: English, French, German, Spanish Terms of use: standard Apple Terms of Use (EULA) (https://www.apple.com/legal/internet-services/itunes/dev/stdeula/)

About

Ring Sizer

Accurately measure ring and finger sizes from home, ensuring a perfect fit for any occasion. Convert sizes internationally and save measurements for future use. Ideal for online ring purchases, eliminating guesswork.

Highlights
  • Measure ring diameter/circumference
  • Measure finger width
  • International size conversions
  • Save measurements
  • Share measurements
Read full description

Quickly and easily find the perfect ring size with this ring and finger sizing app—offering the same precision as your jeweler, from the comfort of your home. Whether you're a professional jeweler, a frequent shopper, or purchasing your first ring, Risi ensures the perfect fit for every special occasion—engagements, weddings, birthdays, holidays, or surprises! Measure fingers or rings with ease, whether it's for yourself, a friend, a family member, or anyone special, and convert sizes across international standards. Risi is the go-to tool for anyone buying a ring online, eliminating the fear of choosing the wrong size. • Get the exact size of any ring: Measure the diameter or circumference in either metric (millimeters) or imperial (US inches) units, for yourself or someone else. • Accurately measure finger size: Easily measure finger width, perfect for when you don't have a ring on hand. • International size conversions: Seamlessly switch between popular global sizing systems (US/CA/MX, UK/AU/NZ, EU/ISO, JP/CN, and more) while maintaining accuracy. • Save measurements: Keep ring and finger sizes saved for future reference and easy access. • Share measurements: Share size info with jewelers or friends via text, email, or social media. No more guessing! With Risi, shop confidently and experience the joy of buying or giving a perfectly sized ring that will be cherished forever. Make special moments unforgettable with a ring that fits just right. To unlock all features and functionality, you can make a one-time in-app purchase for lifetime access (no subscription). This purchase will be charged to your Apple account at the time of confirmation. Privacy Policy: https://ringfitter.alpennec.com/privacy Terms and Conditions: https://www.apple.com/legal/internet-services/itunes/dev/stdeula

Screenshots

Dornheim 3D Scanner4 screens
Ring Sizer4 screens

Verdict

The call

The clearest difference is update cadence: Ring Sizer at weekly against Dornheim 3D Scanner's every 17 months. Dornheim 3D Scanner's advantage is iOS requirement (13.0 vs 17.0). On price, ads, in-app purchases and device support 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Dornheim 3D Scanner sells 7 in-app purchases, starting at $9.99 per month and Ring Sizer sells 13 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Dornheim 3D Scanner ships an update every 17 months, Ring Sizer weekly. The most recent releases landed on September 17, 2026 and September 9, 2026 respectively.

Scorecard2 real differences · 8 level
Dornheim 3D Scanner versus Ring Sizer: the parameters behind the verdict, then further details
ParameterDornheim 3D ScannerRing Sizer
PriceFreeFree
Rating—4.6 (36 ratings) — better
Positive reviews—88.2% of reviews
Number of ratings—36 — better
Update frequencyEvery 17 monthsWeekly — better
AdsNoNo
In-app purchasesYesYes
Monetization—Free with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.0 — better17.0
Further details — not scored
Size11 MB19 MB
Age rating4+4+
DeveloperDornheim Medical Images GmbHAxel Le Pennec

In-app purchases

7 purchases

Dornheim 3D Scanner

Subscriptions1
  • Premium$9.991 Month
One-time6
  • Export function - Monthly$4.99
  • Measurement - Monthly$9.99
  • Export function - Yearly$39.99
Show 3 more
  • Measurement - Yearly$79.99
  • Export function - Perpetual$99.99
  • Measurement - Perpetual$199.99
13 purchases

Ring Sizer

Subscriptions8
  • Weekly3 Days trial2 variants$4.997 Days
  • Weekly$4.997 Days
  • Weekly3 Days trial$5.997 Days
Show 5 more
  • Weekly$6.997 Days
  • Weekly3 Days trial$6.997 Days
  • Weekly3 Days trial$7.997 Days
  • Yearly$17.991 Year
  • Yearly3 Days trial$24.991 Year
One-time5
  • Lifetime$2.99
  • Lifetime$4.99
  • Lifetime$6.99
Show 2 more
  • Lifetime2 variants$19.99
  • Lifetime$99.99

Questions

Is Dornheim 3D Scanner free?
Dornheim 3D Scanner is free to download, with in-app purchases available.
Is Ring Sizer free?
Ring Sizer is free to download, with in-app purchases available.
Do Dornheim 3D Scanner or Ring Sizer have ads?
Neither Dornheim 3D Scanner nor Ring Sizer shows ads.
Which is updated more often, Dornheim 3D Scanner or Ring Sizer?
Dornheim 3D Scanner ships an update every 17 months, and Ring Sizer weekly. Most recently, Dornheim 3D Scanner was updated on September 17, 2026 and Ring Sizer on September 9, 2026.

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