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
45 Ratings

45 Ratings

Tus Hlub ,


Controls are clunky when sliding the pointer to desired value. Your arrow selections are also limited. When you configure your arrow and set up, you have a list of 5 arrows of which I’ve never even heard of to experiment with. Where are the Easton/gold tip/carbon express arrows? I would’ve thought you would at least get those as an option. You also pay for the app, but still have to pay more for the “premium functions”.

Developer Response ,

Sliders were replaced by up/down buttons in the current app version.

The "Placeholder" shaft database is the default database the app uses to show basic functionality.

A complete arrow database..2019 Database available as a Premium Feature In-App purchase for $1 ($0.99). There are approximately 42 current and discontinued manufacturers in the Premium Feature 2019 Database.

The app will accurately calculate SPINE,FOC,MO,KE,TAW,and FPS..even if you choose not to upgrade to the premium database.

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.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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