RoundKeep Zero: Group & MOA

TimeSlower LLC

In-app purchases

About this app

Know exactly how good your group was.

RoundKeep Zero turns a photo of your target into an accurate shot group
measurement. Measure group size in inches and MOA — no caliper, no ruler,
no manual marking.

Whether you're sighting in and zeroing a rifle, testing ammunition,
working up a load, or tracking your accuracy over time, RoundKeep Zero is
the fastest way to score a target and log your groups.

HOW IT WORKS
1. Print one of our free targets, or use your own.
2. Take a photo with your phone.
3. RoundKeep Zero detects your shots, scales the image, and calculates
group size, extreme spread, mean radius, and MOA.

ACCURATE TARGET SCALING
Our printable targets include built-in reference markers, so the app
scales your photo automatically — even shot at an angle. No drawing
reference lines. No entering measurements. No guesswork. Using a plain
target? RoundKeep Zero falls back to bullet-hole diameter to measure any
target you've already shot.

AUTOMATIC SHOT DETECTION
On-device computer vision detects bullet holes and measures your groups
automatically. Add, move, or delete shots with a tap, assign shots to
groups, and fine-tune the scale — measurements update instantly.

TRACK YOUR PROGRESS
• Group size in inches and MOA at any distance
• Extreme spread and mean radius
• Best group, average, and consistency over time
• Group and compare by caliber, load, or session — built for load
development and confirming your zero
• A searchable library of every target and shooting session

FEATURES
• Measure shot groups in inches and MOA
• Automatic extreme spread and mean radius
• Target analysis for precision rifle, rimfire, pistol, and more
• Works with your distance and caliber
• Save targets to your personal shooting log
• Share clean, annotated target images
• Fully editable shot detection and measurements

BUILT FOR SHOOTERS WHO CARE ABOUT GROUPS
Precision rifle, long range, rimfire, pistol, benchrest, load development,
and confirming zero — if you measure your groups, RoundKeep Zero replaces
the caliper, the spreadsheet, and the guesswork.

FREE PRINTABLE TARGETS
Print our free marker-enabled targets from the app for the fastest, most
accurate measurements — or use any target you like.

PRIVATE BY DESIGN
All target analysis runs on your device. No account needed. No upload.

Print. Shoot. Snap. Measure.

What’s new

- Added grid detection in target analysis for automatic scaling
- Added scoring for a few RoundKeep target types