ClayFit: Clay Shrinkage
Size it before you fire it
Free · In-App Purchases · Designed for iPad. Not verified for macOS.
Measured shrinkage per clay and firing profile: average, sample count, spread. Work backwards from target size to wet dimension. One-time purchase, offline, no account.
Every clay body shrinks. Yours does not shrink by the number on the bag — it shrinks by whatever your clay, your kiln and your firing schedule actually do. ClayFit measures that, remembers it, and works backwards from the size you want.
YOUR CLAY, NOT THE CATALOGUE
Manufacturer figures are a starting point. The rate you get depends on the batch, the bisque, the cone you fire to and the atmosphere in the kiln. ClayFit stores a measured shrinkage rate for each clay and each firing profile, built from test bars and finished pieces you measured yourself.
WORK BACKWARDS FROM THE FINISHED SIZE
You know the mug should be 90 mm across when it comes out of the glaze firing. ClayFit tells you how wide to throw it wet. Enter a target and it gives you the wet dimension, using your own measured rate — and it shows you the rate it used, how many measurements it came from, and how much those measurements varied.
EVERY STAGE, NOT JUST THE TOTAL
Record a test bar wet, then bone dry, then after bisque, then after the final firing. ClayFit works out the shrinkage at each step and the total from wet to fired. Enter the wet measurement today and come back weeks later to add the rest — the record waits for you.
VOLUME TOO
A 500 ml bowl fired is not a 500 ml bowl wet. Linear shrinkage compounds in three directions, so ClayFit does the cube for you and tells you the wet equivalent volume to aim for.
WHAT YOU GET
• Unlimited firing profiles and measurements per clay
• Average shrinkage with sample count and spread, so you know how solid it is
• Reverse calculator for diameter, width, height, length and volume
• Round up to your preferred step, because short is worse than long
• Outlier detection — impossible readings are flagged and left out
• Home Screen widget showing your active clay and its rate
• mm, cm or inches; ml, litres or fluid ounces; Celsius or Fahrenheit
• Everything stays on your device. No account, no network, no tracking
The Unlimited upgrade is a one-time purchase, not a subscription. It removes the clay-body limit and adds CSV export.
ClayFit gives estimates based on the measurements you enter. Real pieces vary with wall thickness, throwing, drying and where they sit in the kiln. Test bars are still the honest way to check a new batch.
Ratings & Reviews
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The developer, Netflowers Inc., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Netflowers Inc.
- Size
- 4.9 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 43 more
- English, Arabic, Bengali, Catalan, Croatian, Czech, Danish, Dutch, Finnish, French, German, Greek, Gujarati, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Kannada, Korean, Malay, Malayalam, Marathi, Norwegian Bokmål, Oriya, Polish, Portuguese, Punjabi, Romanian, Russian, Simplified Chinese, Slovak, Slovenian, Spanish, Swedish, Tamil, Telugu, Thai, Traditional Chinese, Turkish, Ukrainian, Urdu, Vietnamese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- ClayFit Unlimited USD 3.99
- Copyright
- © 2026 netflowers