The only Go library that actually calculates.

package main

import "github.com/werkbook/werkbook"

func main() {
    wb, _ := werkbook.Open("financial_model.xlsx")
    sheet := wb.Sheet("Summary")

    // Change one cell — only the affected subgraph recalculates
    sheet.Set("B2", 150000)

    // Formulas compile to bytecode, not interpreted strings
    revenue := sheet.Get("D10")  // =SUM(B2:B9)*1.08
    margin  := sheet.Get("D15")  // =IF(D10>100000, D10*0.12, D10*0.08)

    fmt.Println(revenue) // 583200
    fmt.Println(margin)  // 69984
}