Comparison

ISS iGuard vs O

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

Head to head
About

ISS iGuard

Features
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ISS iGuard is a revolution in 24 hour personal security protection. Whether you are a shift worker, out on the town, working in a dangerous location or area, or want to know that your family is safe, then ISS iGuard is for you. Simply download the App onto your smart phone, follow the prompts and you are ready to go. When you need the protection of ISS iGuard you login to the App and you are then being monitored. If you are concerned for your safety then simply shake the phone and ISS iGuard will do the rest. You emergency contacts will be sent an SMS of your present location and your emergency escalation requirements will be activated. Video and Audio of your situation is sent to the ISS iGuard cloud and on to your contacts. If you have made a mistake you can cancel your emergency by keying in your PIN and your contacts will be updated. ISS iGuard cab also look after your business requirements monitoring and protecting your employee offering a complete business solution and compiles with BS8484 OH&S standards. Users can login to the ISS iGuard portal via the website to manage their account, update their profile and view alerts. Businesses can monitor the safety of their employees directly to existing computer systems with internet access. ISS iGuard is a total personal solution for you. Continued use of GPS running in the background can dramatically decrease battery life.

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.

Screenshots

ISS iGuard4 screens
O4 screens

Verdict

The call

The clearest difference is update cadence: ISS iGuard at every 4 months against O's every 11 months. ISS iGuard also leads on device support (3 vs 1) and iOS requirement (14.0 vs 16.0). 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

ISS iGuard ships an update every 4 months, O every 11 months. The most recent releases landed on October 13, 2026 and October 12, 2026 respectively.

Scorecard3 real differences · 7 level
ISS iGuard versus O: the parameters behind the verdict, then further details
ParameterISS iGuardO
PriceFreeFree
Rating—5.0 (1 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—1 — better
Update frequencyEvery 4 months — betterEvery 11 months
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS14.0 — better16.0
Further details — not scored
Size95 MB47 MB
Age rating4+4+
DeveloperInfratec Security SystemsGE MAO RUBBER INDUSTRIAL CO., LTD.

In-app purchases

None

ISS iGuard

No in-app purchases

None

O

No in-app purchases

Questions

Is ISS iGuard free?
ISS iGuard is free to download, with no in-app purchases.
Is O free?
O is free to download, with no in-app purchases.
Do ISS iGuard or O have ads?
Neither ISS iGuard nor O shows ads.
Which is updated more often, ISS iGuard or O?
ISS iGuard ships an update every 4 months, and O every 11 months. Most recently, ISS iGuard was updated on October 13, 2026 and O on October 12, 2026.

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