# Kilnshrink: Clay Shrinkage — Test Bars and Observed Ranges

> Test Bars and Observed Ranges (iPhone/iPad app by Robert Corbin.)

- Source: https://appshunter.io/ios/app/kilnshrink-clay-shrinkage/id6777078165 (this page in markdown: same URL + `.md`)
- Developer: [Robert Corbin](https://appshunter.io/developer/1890247992)
- Category: Utilities, Education
- Price: $3.99
- Age rating: 4+
- Requires: iOS 17.0 · 31 MB
- Languages: American English
- Released: 2026-06-11
- Data updated: 2026-10-08

## What is Kilnshrink?

Group measured test bars by clay, firing and direction, then compare observed shrinkage and size a target from your own range.

HOW IT WORKS
1. Open Test Series and name the clay, firing and measurement direction.
2. Record wet, dry and fired lengths for each test bar using consistent units.
3. Review the mean and observed range, calculate a target-size range and share the measurements.

Existing shrinkage and studio planning tools remain available.

WHAT TO KNOW
Results describe the bars you entered; they do not predict every future firing. Lengths must be positive and nonincreasing from wet to dry to fired. Keep clay, firing and direction consistent when comparing.

iPhone and iPad.

## Is Kilnshrink safe?

Not enough ratings yet to assess Kilnshrink.

## Is Kilnshrink legit?

Kilnshrink: Clay Shrinkage appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Kilnshrink is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 5 releases)

### 3.0.1 — 2026-09-29

A clearer App Store name and search details. No other changes in this update.

### 3.0 — 2026-09-14

Test Series

Group measured test bars by clay, firing and direction, then compare observed shrinkage and size a target from your own range.

1. Open Test Series and name the clay, firing and measurement direction.
2. Record wet, dry and fired lengths for each test bar using consistent units.
3. Review the mean and observed range, calculate a target-size range and share the measurements.

Results describe the bars you entered; they do not predict every future firing. Lengths must be positive and nonincreasing from wet to dry to fired. Keep clay, firing and direction consistent when comparing.

### 2.1 — 2026-06-30

Version 2.1 adds Batch Board, a production planning tool for repeatable thrown sets. It calculates wet dimensions, clay reserve, shelf footprint, tolerance bands, rough capacity, readiness score, and copyable batch notes.

This release also adds a bundled Studio Reference Pack with ten offline sheets for shrinkage workflow, test bars, batch planning, capacity math, cones, glaze specific gravity, clay weights, firing schedules, inch fractions, and studio checklists.

### 2.0 — 2026-06-24

Kilnshrink 2.0 — a pro studio upgrade for potters, still 100% offline.

• Cone Reference: the full Orton cone chart (022–14) at two heating rates, plus a "what cone did I reach?" peak-temperature lookup.
• Glaze Recipes: build percentage recipes and batch-scale them to any gram target.
• Specific Gravity tool: measure SG from a sample and get the exact water to add.
• Firing Schedules: build ramp / hold / cool programs with total time, peak temp, and peak cone.
• Clay Weight Guide: the starting ball-of-clay weight for six thrown forms by size.
• Temperature and weight converters woven throughout.

No account, no network — everything stays on your device.

### 1.2 — 2026-06-17

Throwing Chart: turn your selected clay into a printable, shareable shrinkage reference card — common finished sizes beside the wet size to throw, with proper inch fractions, plus clay name, cone, and shrinkage %. Toggle finished->wet or wet->fired and export a crisp image to Photos, AirPrint, or Messages. Plus clearer error messages in Calculate and Volume.

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## More apps by Robert Corbin

- [Daily Word Journey](https://appshunter.io/ios/app/daily-word-journey/id6761548266)
- [Hush Secret Text: Encryption](https://appshunter.io/ios/app/hush-secret-text-encryption/id6761658175)
- [Renew Guard](https://appshunter.io/ios/app/renew-guard/id6761755447)
- [Receipt to PDF: Expense Report](https://appshunter.io/ios/app/receipt-to-pdf-expense-report/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 2026-10-08.*