O vs DirectScan
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 suitable O-ring sizes based on installation specifications. It supports metric and inch measurements and offers chemical compatibility checks for various media.
- O-Ring housing calculation
- O-Ring size recommendation
- Quick search by international standards
- Tolerance calculation
- Metric and inch unit switching
- Chemical compatibility check
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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
DirectScan
This app offers robust file management and image editing capabilities. It integrates with a portable scanner via Wi-Fi for on-the-go document digitization and organization.
- File management
- Image editing
- Portable scanner integration
- Wi-Fi connectivity
- Document digitization
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An app with file management and image editing tools, operate with DirectScan Portable Scanner via Wifi.
Screenshots
Verdict
The clearest difference is rating: DirectScan at 5.0 against O's 3.8. DirectScan also leads on update cadence (every 6 weeks vs every 3 months) and iOS requirement (8.0 vs 26.0). O's advantage is ratings volume (5 vs 1). 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.
DirectScan 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.
O ships an update every 3 months, DirectScan every 6 weeks. The most recent releases landed on November 2, 2026 and November 1, 2026 respectively.
| Parameter | O | DirectScan |
|---|---|---|
| Price | Free | Free |
| Rating | 3.8 (5 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 83.3% of reviews | — |
| Number of ratings | 5 — better | 1 |
| Update frequency | Every 3 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 26.0 | 8.0 — better |
| Further details — not scored | ||
| Size | 35 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | Trelleborg Sealing Solutions | Kenxen Limited |
Customer experience
O
DirectScan
In-app purchases
O
No in-app purchases
DirectScan
No in-app purchases
