See the fired glaze before you load a single test tile
Frartap Chente turns a raw recipe into a Seger unity formula and an eight-step prediction: surface, colour, opacity, melt, thermal fit and safety flags. Pick a cone, an atmosphere and a clay body. The answer arrives in seconds.
Download Frartap Chente- 37 raw materials built in
- 8 clay bodies with COE
- Version 3.0
- iOS
Crazing and pinholes show up after the firing. The prediction shows up before it. Run your next recipe through the engine first.
Three setups to copy straight into the app
Each card holds a real setup taken from the app's own screens. Select one, copy it, and start with a result you can check against your own tiles.
Cobalt Satin recipe at cone 6
Neph syenite 30 · Dolomite 15 · Whiting 6 · Kaolin 18 · Silica 22 · Frit 3134 9 + CoCO₃ 1 + Rutile 3
- Predicts satin, translucent, mature melt, fit OK
- Si:Al 6.49 sits inside the satin band
- Fire at cone 6, oxidation, buff stoneware
Target oxides, solved to within 5 %
Na₂O 0.08 · K₂O 0.12 · MgO 0.35 · CaO 0.45 · Al₂O₃ 0.40 · B₂O₃ 0.15 · SiO₂ 2.20
- Choose up to eight materials from your library
- Non-negative least-squares finds the closest recipe
- Target vs Achieved shows every oxide
Five-tile line blend, satin to gloss
Line · 5 tiles · Cone 6 · Oxidation · Buff stoneware · 100 g per tile
- Corner A Cobalt Satin, corner B Clear Gloss 20×5
- Gloss score climbs from G 6.4 to G 9.6
- Colour, Surface, Melt and Fit tabs
These are copyable setup values, not discounts. Estimates from chemistry — confirm with a fired test.
From written recipe to fired tile, step by step
The app follows the order a glaze chemist actually works in. Describe, predict, adjust, blend, fire, record.
Write and predict
- Enter the recipe. Pick from the 37 built-in materials or add your own custom material with its oxide analysis.
- Set the firing. Choose a cone such as Cone 6 · 1222 °C, Oxidation or Reduction, and a clay body such as Buff stoneware.
- Read the Prediction card. Surface, translucency, melt maturity and clay body fit, with a Good or Critical rating.
- Check the reasoning. Each bullet cites its numbers, for example MgO 0.24 adding magnesia matting at G −0.13.
Solve and blend
- Formulate. Set target oxides, hand it up to eight materials, and read the Target vs Achieved bands.
- Blends. Choose Line, Triaxial or Colorant, name the blend, set corner recipes, step count and tile batch size.
- Scan the orbs. Predicted glaze orbs line up across Colour, Surface, Melt and Fit tabs so trends appear before firing.
- Weigh it. The Batch sheet converts a dry batch weight into grams per material plus water.
About the Developer
The developer name is shown on the App Store listing, product id 6831846381. The listing places the app in Utilities.
Version 3.0 carries the note "Interface refinements and bug fixes." The chemistry engine runs on the device, so the oxide maths, the eight-step pipeline and the solver work from your pocket at the bench.
No public star rating is shown on the store yet. The prediction logic is documented in the app: every bullet states its inputs.
Six tools built into one studio
Recipe predictions
Every saved recipe shows its surface (Satin, Gloss and others), translucency, melt maturity and clay body fit, so a list of four glazes reads like a kiln log.
Unity and Weight % panel
Flip between Seger unity and weight percent. See Si:Al, R₂O:RO, LOI and oxides grouped as Fluxes, Stabilizers, Glass formers and Colorants.
Stull map
Your glaze lands on a chart of SiO₂ against Al₂O₃ with the cone 6 window, plus the Gloss and Satin regions bounded at 7.0 and 5.0.
Safety checklist
Boron limit, barium, lithium, colorant load and melt maturity each get a pass mark with an icon and a word, not just a colour.
Formulate solver
Work backwards from a target chemistry. The app picks the best recipe from up to eight library materials and labels the worst oxide, for example K₂O +1 %.
Blends and Firings log
Plan line, triaxial and colorant series, then record real tile outcomes, compare them with predictions and calibrate your clay body expansion range.
How the chemistry engine reads your recipe
You enter raw material weights. The engine multiplies each weight by that material's oxide analysis, adds up the moles of every oxide, and normalises the fluxes (R₂O and RO) to a total of 1.0. The result is a full Seger unity molecular formula, the same notation printed in glaze textbooks.
From that formula an eight-step analysis pipeline runs. It covers melt, surface, opacity, colour, coefficient of thermal expansion and durability. On the Cobalt Satin example, the Si:Al ratio of 6.49 falls between the matte limit of 5.0 and the gloss limit of 7.0, so the surface is called satin. Fluxing power F 0.86 is weighed against a refractory load of 3.72 to judge whether the melt matures at cone 6.
Thermal fit compares the glaze expansion with the COE of the chosen clay body. The built-in bodies range from 60.0 for high-fire porcelain to 72.0 for white earthenware. Log fired results in the Firings tab and the app recalibrates the body's expansion range from real evidence.
| App | Frartap Chente |
|---|---|
| Version | 3.0 |
| Category | Utilities |
| Platform | iPhone, iOS |
| Raw materials | 37 built in, custom additions |
| Clay bodies | 8 built in, custom additions |
| Analysis | Eight-step pipeline, Seger unity |
| Solver | Non-negative least squares, up to 8 materials |
| Blend modes | Line, Triaxial, Colorant |
| Data checked | 14.11.2026 |
Predict the glaze. Then load the kiln.
Frartap Chente for iPhone, version 3.0. It installs as a standard App Store download. Price and size are shown on the store page.
Download Frartap ChenteRequires an iPhone. Age rating and any in-app purchases are listed on the App Store page. Estimates from chemistry — confirm with a fired test.