Zeryn Precision vs Shotholes

Dope you can trust — whether you shoot a $400 rimfire with iron sights or a custom rig at 1,000 yards. Zeryn Precision is a data app built by shooters, for shooters. It replaces the notebook, the shoebox of range cards, and the guesswork with one place that tracks your rifles, your loads, your groups, and your barrel — and teaches you every concept along the way. Precision doesn't have to cost a fortune. YOUR RIFLES, SET UP PROPERLY Add your rifle and optic once — about five minutes. Scopes or open sights: blade, aperture, globe, ghost ring. Zeryn takes iron sights seriously, so your lever gun gets the same treatment as a match rifle. DOPE YOU CAN DIAL Zeryn builds a full dope table for your rifle and load — drop, wind, spin drift — in MOA or mils, out past 1,000. Then True Your Dope: tell it where your shots actually landed and it corrects the table to match your rifle in the real world. Book numbers get you close. Trued dope gets you hits. QUICK DOPE No profile yet? Pick a caliber and a factory load and get a working table in seconds — honest about its limits, with a clear path to a trued profile when you're ready. FIND WHAT YOUR RIFLE LIKES Run a factory ammo shootout: pick contenders from a library of 1,500+ factory loads, shoot a group per ammo on any target you like, and log the numbers. Zeryn picks the winner and graduates it into a Load — dope table and all. Stop buying bulk before you know it shoots. BUILD YOUR HANDLOAD Full load development workups — charge ladders and seating-depth steps. Shoot your steps on any target, log your groups and ES/SD, and graduate the winning node into a Load. Custom projectiles are welcome, with a BC estimator for when the box doesn't tell you. WATCH YOURSELF GET BETTER Log groups, browse your group history, and track your barrel over time — round counts and throat erosion — so you see accuracy trends and plan the rebarrel before it costs you. WE TEACH AS WE GO This is the part other apps skip. Every info button in Zeryn explains the concept in plain words — barrel length, sight height, twist rate, focal planes, turret travel — like a mate at the bench, not a physics lecture. A reference library covers BC, throat erosion, jump to the lands, reading wind, and estimating velocity without a chronograph. If you've ever bounced off a ballistics app because it assumed you already knew everything, this one was built for you. WHO IT'S FOR New shooters welcome. Iron sights welcome. The .22 you plink with on weekends counts just as much as a match rig. Rimfire to ELR, hunting rifles to long-range rigs — if you put rounds on paper and want them closer together, Zeryn is for you. Zeryn Precision is free. No account required. Your data stays yours.

Turn target photos into a clear range journal and get AI guidance to help improve your shooting technique. TAKE A PHOTO OR IMPORT UP TO 10 Capture your paper target or choose photos from your library. Shotholes orders photos by capture time, identifies supported target designs, and compares successive photos to find new hole locations. SEE EACH ROUND CLEARLY Green circles highlight new detections; blue circles show existing holes. Zoom into the original photo, switch between images, or view mapped positions on a clean target diagram when the target can be matched. Photo dates and numbered markers help you follow the sequence. KEEP CONTROL OF YOUR RECORD Add a missed mark or remove an incorrect detection. Saved results remain available on your device without paying to view them again. A new target paper can start a separate record. AI GUIDANCE TO IMPROVE YOUR TECHNIQUE Add your firearm model and shooting distance for guidance based on your target type and shot distribution. Get possible explanations for your patterns and focused practice suggestions for grip consistency, trigger control and follow-through. Receive feedback on your first group, with comparisons to the previous group when available. Guidance runs in the background so you can keep using the app, then stays saved with the corresponding photo. Each photo keeps one guidance result. AI guidance is available at no extra charge. LEARN ABOUT TARGETS Browse common target types, their uses, and range safety references in the Learning tab. PAY FOR THE ANALYSIS YOU USE Create an account with your email and password. Eligible devices receive a one-time US$2 analysis credit. Add US$5, US$10, or US$20 in analysis credits through in-app purchases. Analysis usage and charges appear in your account history. Credits do not expire; regional purchase prices are shown before checkout. Internet access is required for AI features. Paid photo analysis uses your account balance. Available in English, Chinese, and Spanish, on iPhone. AI detections and target mapping are estimates. Overlapping holes, torn paper, blur, and perspective can affect results. You can correct markers in the app. Photos and saved records stay on your device; photos selected for analysis are sent securely to our analysis service and OpenAI. For AI guidance, a generated target diagram, firearm and distance details, target description and app language are sent to Gemini.