Zero Sight-In Calculator for iPhone

Zero is a free sight-in calculator for red dot optics, built by Forward Thinking Solutions.

Shoot a group, measure how far it landed from your point of aim, and Zero turns that measurement into exact turret adjustments for your optic. No math at the bench, no wasted ammo walking a group in one click at a time.

What it does:

• Converts your group's offset into elevation and windage clicks, with the direction to turn
• Works in MOA and MIL (MRAD), yards or meters, inches or centimeters
• Includes a built in catalog of 162 pistol red dot optics, with Common and Personal lists, plus manual entry for any optic
• Save your own optics in the app and reuse them at the range
• Reports how much of the target your dot covers at your distance
• Photo Zero lets you photograph a target, set the scale from a known reference, mark your aim point and impacts, and get group size, group center, and the turret adjustment for the selected optic
• Share a finished target analysis as an overlay image, or save it to Photos
• Runs completely offline, which is the whole point at most ranges
• No account, no ads, no data collected. The app never phones home

How you get it:
This is a free digital item. Add it to your cart and check out (still free), and you will get an email with a one page PDF containing your App Store download link and a QR code. Open the link on your iPhone, tap Get, and you are done.

No iPhone? The web version of Zero is free too and runs in any browser: forwardthinking-online.com/pages/zero-sight-in-calculator

Questions or feedback: ftsest2015@gmail.com. If the click counts ever disagree with your optic, that email is the fastest way to get it looked at.

FAQ

Is it really free?
Yes. No in-app purchases, no ads, no subscription. Free is the whole model.

Does it work without cell service?
Yes. Zero runs entirely on your phone. It was built for ranges with no signal.

My optic is not in the catalog. Can I still use it?
Yes. Use Manual entry and type in your optic's click value, or save it as a custom optic and it stays in your list.

What is Photo Zero?
Photo Zero analyzes a photo of your target. You set the scale, mark where you aimed and where the shots landed, and Zero calculates the group and the adjustment for your optic. The photo is processed on your iPhone only.

Is there an Android version?
Not yet. The web version works in any phone browser in the meantime.