Comparison

O vs O

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

Head to head
About

O

This app helps users calculate O-Ring dimensions and find compatible materials for their applications. It provides recommendations based on ISO standards and supports both metric and inch measurements.

Highlights
  • O-Ring housing calculation
  • O-Ring size recommendations by ISO standard
  • Quick search by national/international standards
  • O-Ring tolerance calculation
  • Metric and inch unit switching
  • Chemical compatibility check
  • Integration of Trelleborg Sealing Solutions Videos
Features
Read full description

The Trelleborg Sealing Solutions O-Ring App calculates O-Ring dimensions by simply entering installation specifications for your application in metric or inch. In addition, the App recommends O-Ring sizes according to ISO 3601 so you know exactly which part you need. Features at a Glance: - O-Ring Housing: After entering the bore or rod/shaft diameter, you will receive an O-Ring recommendation and O-Ring housing calculation according to the recommendations of ISO 3601 - O-Ring Quick Search: offers the selection of O-Ring nominal sizes according to the following national/international standards: ISO 3601-1 Class B (International), ISO 3601-1 Class A (AS 568, USA), NFT 47-502 (France), JIS B 2401 (Japan) SMS 1586 (Sweden) - Tolerances: calculation of O-Ring tolerances according to ISO 3601-1 Class B and Class A - Switch between metric and inch - Chemical compatibility check: find out which materials are compatible with the media used in your application. - Integration of Trelleborg Sealing Solutions Videos

About

O

Features
Read full description

Transform Your O-Ring Measurement with AI Precision! Say goodbye to guesswork and inaccurate measurements. Our cutting-edge app uses advanced AI technology to determine the exact size of your O-rings with just a snap of a photo. Whether you’re a professional in the automotive, plumbing, or manufacturing industries, or a DIY enthusiast, our app is designed to make your life easier and your work more precise. Key Features: - Instant Measurements: Simply take a photo of your O-ring, and let our AI do the rest. Get precise measurements in seconds without any hassle. - High Accuracy: Our advanced AI algorithms ensure that you get the exact dimensions of your O-rings every time, eliminating the risk of errors. - User-Friendly Interface: The app is designed with a clean and intuitive interface, making it easy for anyone to use, regardless of technical expertise. - Versatile Application: Ideal for various industries, including automotive, plumbing, manufacturing, and more. Whether you need to measure O-rings for professional projects or home repairs, this app is your perfect companion. - Step-by-Step Guidance: Follow the simple instructions to ensure you capture the perfect photo for accurate measurements every time. Why Choose Our App? Our app leverages the latest in AI technology to bring you unparalleled accuracy and convenience. No more fumbling with manual tools or second-guessing your measurements. Just snap, measure, and get back to what you do best.

Screenshots

O4 screens
O3 screens

Verdict

The call

The clearest difference is update cadence: O at every 3 months against O's every 13 months. O also leads on device support (3 vs 1) and iOS requirement (12.1 vs 16.2). On price, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

O ships an update every 3 months, O every 13 months. The most recent releases landed on June 4, 2026 and September 13, 2026 respectively.

Scorecard3 real differences · 7 level
O versus O: the parameters behind the verdict, then further details
ParameterOO
PriceFreeFree
Rating3.8 (5 ratings) — better—
Positive reviews83.3% of reviews—
Number of ratings5 — better—
Update frequencyEvery 3 months — betterEvery 13 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS12.1 — better16.2
Further details — not scored
Size26 MB5 MB
Age rating12+4+
DeveloperTrelleborg Sealing SolutionsAppBakkers BV

In-app purchases

None

O

No in-app purchases

None

O

No in-app purchases

Questions

Is O free?
O is free to download, with no in-app purchases.
Is O free?
O is free to download, with no in-app purchases.
Do O or O have ads?
Neither O nor O shows ads.
Which is updated more often, O or O?
O ships an update every 3 months, and O every 13 months. Most recently, O was updated on June 4, 2026 and O on September 13, 2026.

Other comparisons