Apps like O-Ring

Here are some great alternatives to O-Ring by Trelleborg Sealing Solutions :
Fit Tolerance ISO
Fit Tolerance ISO
★4.8
Tolerance and fits ISO
Tolerance and fits ISO
★5.0
Thread calculator
Thread calculator
★4.4
MechTab
MechTab
★4.4
Ring Size Finder
Ring Size Finder
★3.3
Ring Sizer App
Ring Sizer App
★3.4
Ring Sizer - Measure Ring Size
Ring Sizer - Measure Ring Size
★3.5
Ring Sizer by Avinya ©
Ring Sizer by Avinya ©
★3.8
RingFit - Ring Size Finder App
RingFit - Ring Size Finder App
★3.7
Accurate Ring Sizer (No Ring)
Accurate Ring Sizer (No Ring)
★4.1
Flange Bolt Size & Torque
Flange Bolt Size & Torque
★4.6
Screw Thread Data Calculator
Screw Thread Data Calculator
★4.6
Camcut
Camcut
★3.4
Ring Sizer Tool - Ring Measure
Ring Sizer Tool - Ring Measure
★3.7
Color Rings - 3D Happy Ring Pu
Color Rings - 3D Happy Ring Pu
★4.1
Energy ring of desires
Energy ring of desires
★4.3