# Grain: Arrow Weight Matching — Calibrate & Balance Your Set

> Calibrate & Balance Your Set (iPhone/iPad app by JEFFREY JACE CALLOR.)

- Source: https://appshunter.io/ios/app/grain-arrow-weight-matching/id6800040083 (this page in markdown: same URL + `.md`)
- Developer: [JEFFREY JACE CALLOR](https://appshunter.io/developer/1886760804)
- Category: Sports, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 16.4 · 41 MB
- Languages: American English
- Released: 2026-10-09
- Data updated: 2026-10-31

## What is Grain?

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 free, up to 6 arrows in one set.

GRAIN PRO
- Unlimited arrows per set
- Multiple saved sets & quivers
- Build history across a season
- Custom exact tolerance
- Multi-bow profiles

Grain Pro is available as a weekly or yearly subscription. No free trial — the free tier is a real, working preview of the algorithm itself, not a countdown.

Privacy Policy: https://drommarllc.com/grain/privacy.
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Grain Pro Yearly | $39.99 | per year |
| Grain Pro Weekly | $2.99 | per 7 days |


## Is Grain safe?

Not enough ratings yet to assess Grain.

## Is Grain legit?

Grain: Arrow Weight Matching has limited verification signals. The AppsHunter Legitimacy Score for Grain is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-10-09

No release notes.

## More apps by JEFFREY JACE CALLOR

- [Be Calm & Grounded - MommyHub](https://appshunter.io/ios/app/be-calm-and-grounded-mommyhub/id6760910811)

All apps by JEFFREY JACE CALLOR: https://appshunter.io/developer/1886760804

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-31.*