COSESAI

Stop Typing Excel Formulas from Memory: A Field Guide to the Twelve Functions You Actually Use

By xiezixing 2026年8月2日

A formula builder for the twelve Excel functions that cover 90% of everyday spreadsheet work — pick, fill, paste, audit the logic instead of the syntax.

Spreadsheet headers and sample rows becoming a reviewable JSON Schema contract

Your Spreadsheet Is Already an API Contract. You Just Have Not Written It Down.

By xiezixing 2026年7月19日

Infer a reviewable JSON Schema from XLSX headers and sample rows before the first irreversible data import.

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Data Outlier Processor: the five numbers your spreadsheet lied about

By xiezixing 2026年6月21日

A spreadsheet told a quiet lie for nine months. The Q3 forecast column had 248…