Comparison

O vs SCR MAXFLO™

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 provides a comprehensive offline tool for selecting standard rubber seal sizes, including O-Rings, X-Rings, and Back-Up Rings. It offers dimension searches, housing calculations for various sealing applications, and supports multiple international standards in both metric and imperial units.

Highlights
  • Offline standard rubber seal size selection
  • Search for O-Ring, X-Ring, and Back-Up Ring sizes
  • O-Ring housing calculations for sealing applications
  • Supports multiple international standards (AS568, METRIC, JIS, etc.)
  • Metric and Imperial unit support
  • Substitutable O-Ring size suggestions
Features
Read full description

GMORS O-Ring Master is the completed tool for standard rubber seal sizes. When you use this APP, you don't need to have internet and catalog. Except O-Ring sizes, it also includes the search functions of X-Ring and Back-Up Ring. Otherwise, you can also use O-Ring Housing to choose suitable O-Ring in your application. Main functions are as follows: Dimension Search:O-Ring, X-Ring and Back-Up Ring. - MM and Inch are both available. - Full standard O-Ring series: AS568, BS 4518, GB/T 3452.1, JIS B2401 P, JIS B2401 G, JIS B2401 S, JIS B2401 V, SMS 1586 and METRIC. - Collocated Back-Up for AS-568 O-Ring. - Substitutable O-Ring sizes within tolerance are available. O-Ring Housing: Piston Sealing、Rod Sealing and Face Sealing. - MM and Inch are both available. - Support calculation for both Static and Dynamic sealing applications (Face sealing is with static calculation only). - Up to 7 O-Ring standards ( AS568, METRIC, JIS B2401 P/G/S/V, JASO F404, GB/T 3452.1, BS 4518 and SMS 1586) for most of size requirement of different groove design.

About

SCR MAXFLO™

This app calculates pressure drop, fluid velocity, Reynold's number, and friction factor for liquids and gases. It allows users to create custom projects, manage pipes, fluids, and fittings, and supports both metric and imperial units for efficient on-site work.

Highlights
  • Pressure drop calculation
  • Fluid velocity calculation
  • Reynold's number calculation
  • Friction factor calculation
  • Custom project creation
  • Pipe, fluid, and fitting management
  • Metric and imperial unit support
Features
Read full description

The SCR MAXFLO™ App calculates pressure drop, fluid velocity, Reynold’s number, and friction factor for both liquid and gas. Other features include the ability to create custom projects as well as the ability to add and edit pipes, fluids, and fittings. Need to work in metric and imperial units? The SCR MAXFLO™ App has you covered. From changing pipe size on the fly to sharing your calculations with other users, the SCR MAXFLO™ App can help you work quickly and efficiently on any job site.

Screenshots

O4 screens
SCR MAXFLO™4 screens

Verdict

The call

The clearest difference is rating: O at 5.0 against SCR MAXFLO™'s 4.6. SCR MAXFLO™'s advantage is ratings volume (5 vs 1). On price, update cadence, 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.

ReceptionRating · Positive reviews · Number of ratings

O holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: SCR MAXFLO™ has 5 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 11 months. The most recent releases landed on September 22, 2026 and September 9, 2026 respectively.

Scorecard2 real differences · 7 level
O versus SCR MAXFLO™: the parameters behind the verdict, then further details
ParameterOSCR MAXFLO™
PriceFreeFree
Rating5.0 (1 ratings) — better4.6 (5 ratings)
Number of ratings15 — better
Update frequencyEvery 11 monthsEvery 11 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhoneiPhone
Requires iOS16.0 — better16.6
Further details — not scored
Size47 MB7 MB
Age rating4+4+
DeveloperGE MAO RUBBER INDUSTRIAL CO., LTD.Southwire Company

Customer experience

O

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

SCR MAXFLO™

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

O

No in-app purchases

None

SCR MAXFLO™

No in-app purchases

Questions

Is O free?
O is free to download, with no in-app purchases.
Is SCR MAXFLO™ free?
SCR MAXFLO™ is free to download, with no in-app purchases.
Which has better reviews, O or SCR MAXFLO™?
O is rated higher. O averages 5.0 out of 5 from 1 ratings, while SCR MAXFLO™ averages 4.6 from 5 ratings.
Do O or SCR MAXFLO™ have ads?
Neither O nor SCR MAXFLO™ shows ads.
Which is updated more often, O or SCR MAXFLO™?
O ships an update every 11 months, and SCR MAXFLO™ every 11 months. Most recently, O was updated on September 22, 2026 and SCR MAXFLO™ on September 9, 2026.

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