OT2Go Spine 4+

Ideal Spine At Your Fingertips

Pinwheel Software, Inc.

    • $0.99
    • Offers In-App Purchases



An archery toolbox for calculating proper arrow spine.

In-App purchases unlock Premium Features.

The app uses a configuration created from the user's bow definition and desired arrow parameters.

It is the only handheld app available for shaft selection that is based on bow performance. It has the same features and flexibility as the desktop app available from Pinwheel Software.

You can search by shaft manufacturer, shaft construction (aluminum, carbon, aluminum/carbon), and shaft usage (target, hunting, both).

You can search the database for a specific weight range for a completed arrow (with your components), a shaft diameter range, or a specific percent FOC range. Choose to include or omit discontinued shafts.

Flexible, Accurate, Unique.

What’s New

Version 1.6

Enhanced support for database updating.
Replaced Quick Change sliders with Up Down Buttons.
Minor bug fixes.

Ratings and Reviews

2.2 out of 5
65 Ratings

65 Ratings

Dave0317 ,

Doesn’t seem to function right

Even after purchasing the “premium” features, this app does not do anything useful. It will not load a database of arrows to choose from as described. A google search seems to show people have been having issues with this app since 2019 and it has remained here with the same problems. Please fix this app, it’s practically a scam to leave this non-functioning version on here for years on end.

Developer Response ,

Accurate user input calculates SPINE,FOC,MO,KE,TAW,and FPS. NO Premium purchases are required. If your phone settings do not allow the app to download the DB after the premium feature purchase, that is not the fault of the app.

tmorg50 ,

Same as On Computer and way cheaper

I have no idea where these negative reviews are coming from. This app is the same info as the one I have on my computer. My suggestion would be learn how to use the program before you start saying negative things about it. Sure there’s a bit of a learning curve but nothing an average person can’t figure out. Took me an hour or so of playing around with it the first time I used it on my computer and I was all set. I down loaded this app and it basically took me 5 min. I input the same info I had on my computer at home and got the exact same result. I paid $30 for the one on my computer and this only costed me $5. I have 3 different arrows that shoot lights out. Very happy with this purchase. Good job with this app! BTW I don’t work for or know the owner of this software This is my none biased opinion.

AZArcher1111 ,

Valuable tool for the serious archer

I’ve been using this app for 3 months, and I find it to be a must for tinkering with arrow setups.

When I first started using the program, I didn’t understand how to change the parameters correctly, or search for arrows, and this led to some frustration. But after taking the time to learn the program, I am so appreciative of the work put in by the developers! I’m happy that the database is very up to date, and even included arrows that hasn’t been released yet... only announced! I bought the new Victory VAP SS based on the info I was able to glean from this app.

There is nothing else like it, and people who are giving this app negative reviews need to take the time to learn the program and input the correct information to get the desired results.

App Privacy

The developer, Pinwheel Software, Inc., has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.

More By This Developer

You Might Also Like