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Grain: Arrow Weight Matching

Calibrate & Balance Your Set
JEFFREY JACE CALLOR · Sports
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App info

Developer
JEFFREY JACE CALLOR
Category
Sports, Utilities
Released
Oct 9, 2026
Version
1.0 (Oct 9, 2026)
Price
Free
Size
40.6 MB
Requires
iOS 16.4
Age rating
9+
Languages
English

In-app purchases

Grain Pro Weekly$2.99
Grain Pro Yearly$39.99
Current prices, App Store US.
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About Grain: Arrow Weight Matching

Grain builds the tightest-matched arrow set your components can produce. Most tools calculate one arrow at a time. Grain is different: it looks at every component you've weighed — every shaft, point, insert, nock, and fletching — and searches for the exact combination across your whole set that minimizes weight variance. Not an estimate. Not a manual spreadsheet. A real optimization built for competitive archers who take grain-level consistency seriously. HOW IT WORKS - Choose your components — start with the defaults or add your own - Weigh each one (spares welcome — Grain picks the best combination) - Set your tolerance - Get your matched build, arrow by arrow BUILT FOR SERIOUS ARCHERS Grain is made for Olympic and barebow recurve archers competing at the JOAD, collegiate, and USAT/World Archery level — where a few grains of variance matter. FREE TO START Try the full matching engine…
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