Yaya Tools
Yaya Tools
Free calculators and private utilities for everyday tasks
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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