Best apps like O-Ring

10+ similar apps compared and reviewed

4.1 avg rating
8 free apps
Updated July 2026

O is great, but it's not the only option. Explore 10+ similar apps for iPhone and iPad, each reviewed and rated by real users. Find free alternatives, premium upgrades, and hidden gems.

KobCard

KobCard by KOB MARKETING

Gift Card Information Platform
📊 Productivity
4.0(62 ratings)
Free
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KobCard is a comprehensive gift card information platform that offers real-time exchange rates, price calculations, and the latest news on gift cards. It serves as a one-stop destination for individuals looking to buy, sell, or stay informed about the world of gift cards.

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Top Alternatives to O

Thread Calculator#1

Thread Calculator by GSR Gustav Stursberg GmbH

Data for metal working
Editor's Choice
📊 Productivity
4.3(13 ratings)
FreeAds
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This app provides a quick and easy way to calculate thread dimensions for various units, including tap hole sizes and bolt specifications. It helps metalworkers find precise measurements for internal and external threads without consulting tables.

Hydraulic-Calculator#2

Hydraulic-Calculator by Zanthic Automation Inc.

Strong Contender
📊 Productivity
4.2(16 ratings)
FreeIn-App Purchases
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Perform essential hydraulic calculations for cylinders, pumps, and fluid lines. Solve for forces, speeds, torque, power, and pressure drop. Supports metric and imperial units, with advanced features unlocked via in-app purchase.

More apps like O

4
OriginCheck
OriginCheck
OriginCheck
by Schaeffler Technologies GmbH & Co. KG
Free

Verify the authenticity of Schaeffler products and dealer certificates by scanning unique 2D codes. Receive immediate feedback on originality and get guided instructions for suspected counterfeiting, including direct contact with the brand protection team.

Verify 2D product codesCheck dealer certificatesReport suspected counterfeiting
📊 Productivity
(1)
free
5
Mechanical Engineer
Mechanical Engineer
Mechanical Engineer
by Historycentral.com Inc
Free

This app provides over 300 essential mechanical engineering formulas across various domains. It allows users to calculate, save, compare, and share results, aiding in project optimization and decision-making. Users can access a limited number of calculations for free, with a subscription unlocking full functionality.

Over 300 mechanical engineering formulasCovers diverse engineering domainsSave and compare formula results
📊 Productivity
(8)
free with in-app purchases
6
Hydraulic schemes
Hydraulic schemes
Hydraulic schemes
Easily draw hydraulic schemes
$0.99

Easily design hydraulic, heating, cooling, and air conditioning schematics. Drag and drop symbols to quickly build your diagrams. Save and edit your work with the PRO version.

Create hydraulic schemesDrag and drop symbol placementExtensive symbol library
📊 Productivity
(24)
free with in-app purchases
7
CNC Machinist Calculator Pro
CNC Machinist Calculator Pro
CNC Machinist Calculator Pro
by Shane Anderson
$14.99

This app provides a comprehensive suite of calculators and tools for CNC machinists, engineers, and hobbyists. It offers specialized calculations for turning, milling, drilling, threading, and geometric tolerances, along with material data and G-code generation.

Turning, Milling, and Drilling CalculatorsThread and Bolt Pattern CalculatorsGeometric Tolerance (GD&T) Tools
📊 Productivity
(669)
paid
8
Metal Calculator A1 Pro
Metal Calculator A1 Pro
Metal Calculator A1 Pro
Fast precise metal calculation
Free

This app simplifies metal quantity calculations for various projects. It offers tools for calculating quantities, shapes, joints, and performing material tests. Supports both Imperial and Metric systems, with a wide range of metal types and converters.

Quantity calculations for pipes, bars, sheets, and beamsShape customization for metal barsDetailed joint calculations (welded, bolted, riveted)
📊 Productivity
(4)
free
9
MechTab
MechTab
MechTab
The mechanic's helper tool
Free

This app offers a comprehensive set of tools for mechanics, providing essential data on tolerances, threads, cutting speeds, wrench sizes, and roughness. It also includes calculators for material weight, triangle properties, and trowalisation.

ISO-Tolerance data (holes and shafts)Thread specificationsCutting data calculations
📊 Productivity
(16)
free
10
SolidInsight
SolidInsight
SolidInsight
View CAD without format worry
Free

View and collaborate on 2D and 3D CAD files on your mobile device without needing expensive desktop software. Measure designs, access properties, and share feedback instantly.

Supports major 2D/3D CAD formatsView models and drawings on mobileMeasure design dimensions
📊 Productivity
(7)
free with in-app purchases