Yaya Tools

by Min Yi

Free calculators and private utilities for everyday tasks

4.8(6)1Business & Finance

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Yaya Tools is a free, bilingual toolbox of online calculators and utilities. Open a page and calculate pay, money, health, math, dates, or handle text and developer tasks in the browser—no install, no account, and most data never leaves your device.

Features

50+ free tools covering pay, finance, health, math, dates, text, and developer tasks
Runs in the browser with no signup and no install
Most calculations stay on your device
English and Chinese interface
Instant results for tips, discounts, loans, BMI, percentages, and more
Developer utilities for JSON, Base64, hashes, JWT, QR codes, and URL parsing
Text tools for word count, case conversion, dedup, find/replace, and sorting
Favorites and recent tools saved locally on your device

Use Cases

Hourly workers estimating weekly hours, overtime pay, or annual salary
Shoppers checking sale prices, sales tax, or trip fuel cost
Students calculating GPA, final exam scores, percentages, or fractions
Anyone converting timestamps, planning a meeting across time zones, or finding age and date gaps
Developers formatting JSON, decoding JWTs, generating hashes, or picking colors
Writers cleaning lists, counting words, or replacing text in bulk
Fitness tracking with BMI, BMR, and daily calorie estimates

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