釉式Yushiki

Yushiki turns a glaze recipe into the numbers potters actually reason with. Type in your materials and amounts, and it instantly shows the Seger (unity) formula with the bases normalized to 1, the SiO2/Al2O3 ratio, and where the glaze lands on the Stull chart. Everything in the core app runs fully offline on your device. Built for potters and ceramicists who mix their own glazes and want to understand what a recipe is doing, not just follow it. CORE FEATURES (FREE, OFFLINE) - Recipe to formula: enter materials and weights to get the Seger unity formula, silica-to-alumina ratio, and a live position on the Stull chart. - Materials database: representative analyses are built in, and you can edit entries or add your own. - Colorant reference: how iron, copper, cobalt and others develop across different addition levels, with oxidation vs. reduction differences and notes to watch for. - Firing log: record firing date, cone/SK, atmosphere, your rating, photos and notes. Each logged firing adds a point to the Stull chart, so your records grow into a map of your own kiln over time. - Sharing: share a recipe as text, or export a card image with the formula and chart included. PRO FEATURES (SUBSCRIPTION) - Reverse solver: work backward from a target formula to a set of material amounts. - Blend test planner: set up line and triangle blends and export a PDF weigh-out sheet. - Recipe comparison: place recipes side by side to compare formula differences and thermal expansion. - CSV import: bring your own analysis tables into the materials database in one batch. - Firing log backup: export your log to JSON and restore it later. - GPT review: submit a firing photo for analysis and suggestions for an adjusted recipe. PRIVACY Your recipes, materials, firing logs and photos are stored only on your device. There is no account and no sign-in. The app includes no third-party analytics, tracking, or crash-reporting SDKs. Nothing leaves your device unless you are a Pro subscriber and tap to generate a GPT review; in that case a composition summary derived from the recipe, up to one firing photo, and a random install ID are sent through the developer's own server to OpenAI. That data is not tied to your identity, and the app does no cross-app or cross-site tracking. Thermal-expansion estimates and AI insights are meant as relative guides for comparing recipes, not guaranteed absolute values. Actual firing results vary with your materials, clay body, and firing conditions. SUPPORTED DEVICES iPhone / iPad (iOS 17+ / iPadOS 17+). The interface can be switched between Japanese and English in-app (technical data such as raw-material names remains in Japanese). SUBSCRIPTION Yushiki Pro is available as a monthly subscription at 400 yen or a yearly subscription at 3,000 yen, each with a 7-day free trial. Subscriptions renew automatically unless auto-renew is turned off at least 24 hours before the end of the current period. You can manage or cancel your subscription in your App Store account settings after purchase. TERMS OF USE (EULA) Subscriptions are subject to Apple's standard Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/