# Sprockline: Drive Design — Belts, chains and shaft loads

> Belts, chains and shaft loads (iPhone/iPad app by Robert Corbin.)

- Source: https://appshunter.io/ios/app/sprockline-drive-design/id6792826841 (this page in markdown: same URL + `.md`)
- Developer: [Robert Corbin](https://appshunter.io/developer/1890247992)
- Category: Utilities, Productivity
- Price: $3.99
- Age rating: 4+
- Requires: iOS 17.0 · 88 MB
- Released: 2026-07-30
- Data updated: 2026-08-08
- User reviews in markdown: https://appshunter.io/ios/app/sprockline-drive-design/id6792826841/reviews.md

## What is Sprockline?

Sprockline: Drive Design is a focused, fully on-device app. Mechanical drive studio for roller chains, sprockets, V-belts, timing belts, center distance, wrap angle, speed ratio, chain length, service factor, and shaft loads.

KEY FEATURES
- Chain-drive ratio and geometry
- Length and shaft-load screen
- Driver-tooth sensitivity
- Local installation evidence
- Editable sample data and CSV import
- Side-by-side scenario comparison
- Local PDF evidence export
- Fifty-three original offline reference plates

ONE-TIME AND PRIVATE
- One paid download; no subscription or in-app purchase
- No account, advertising, analytics, tracking, or developer-operated backend
- Core features and bundled content work offline
- Work remains on device unless you deliberately share or export it through an Apple system interface

Drive calculations are planning estimates. Confirm manufacturer ratings, shock factors, alignment, lubrication, guards, shaft loads, service environment, and machine safety.


## Version history (last 1 release)

### 1.0 — 2026-07-30

No release notes.

## More apps by Robert Corbin

- [Daily Word Journey](https://appshunter.io/ios/app/daily-word-journey/id6761548266)
- [Hush Secret Text](https://appshunter.io/ios/app/hush-secret-text/id6761658175)
- [Renew Guard](https://appshunter.io/ios/app/renew-guard/id6761755447)
- [Receipt to PDF](https://appshunter.io/ios/app/receipt-to-pdf/id6761782025)
- [Route Your Pay](https://appshunter.io/ios/app/route-your-pay/id6761783719)
- [Tip Arbiter](https://appshunter.io/ios/app/tip-arbiter/id6761786879)

All apps by Robert Corbin: https://appshunter.io/developer/1890247992

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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 2026-08-08.*