O vs Fitting O
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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
Fitting O
Easily identify the correct O-ring for various hydraulic fitting types. Select your fitting style, and the app provides details, common sizes, and specific O-ring information to help you find the right part.
- Hydraulic fitting type selection
- Common O-ring size listing
- Detailed O-ring information
- Supports US Dash and Metric sizes
- Covers Flange, O-Ring Face, and more
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Use this app to find the correct O-ring for one of the many listed Hydraulic Fitting types. Select the fitting style, and the app will give you details on that style along with a list of the various common sizes and the standard O-ring that fits that size. Select a size from that list for more information about that O-Ring to help you locate it. Fittings covered are: • Flange, both Code 61 & 62 • O-Ring Face fitting • O-Ring Boss Port • BSPP, British Standard Parallel Port • ISO 6149 Metric Port • ISO 9974 Metric Port • DIN 2353 tube fittings • JIS, Japanese Industrial Standard Port (BSPP) Sizes use either the US industry standard Dash size or metric. US dash is based on 1/16" and parts are called out as: -2, -4, -6. Where -2 is 2/16" or 1/8" and -8 is 8/16" or 1/2" and so forth. Whenever possible the SAE AS568 standard O-Ring size is used. If not available then the conventional metric ID x Cross based on the fitting size is used. For the JIS Port JIS B2401 sizes are specified.
Screenshots
Verdict
The clearest difference is rating: Fitting O at 5.0 against O's 3.8. Fitting O also leads on review sentiment (100% vs 83%). O's advantage is ratings volume (5 vs 1) and iOS requirement (12.1 vs 15.0). On price, ads, in-app purchases and monetization model 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. Neither carries in-app purchases, so what you see is what you pay.
Fitting O holds the better App Store score, 5.0 against 3.8. That said, the two scores are not equally well evidenced: O has 5 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 83% of O's written reviews are positive against 100% of Fitting O's.
| Parameter | O | Fitting O |
|---|---|---|
| Price | Free | Free |
| Rating | 3.8 (5 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 83.3% of reviews | 100.0% of reviews — better |
| Number of ratings | 5 — better | 1 |
| Update frequency | Every 3 months | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.1 — better | 15.0 |
| Further details — not scored | ||
| Size | 26 MB | 181 MB |
| Age rating | 12+ | 4+ |
| Developer | Trelleborg Sealing Solutions | Anson Thurston |
Customer experience
O
Fitting O
In-app purchases
O
No in-app purchases
Fitting O
No in-app purchases









