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Toolkk Apps

One ecosystem for everyday efficiency

A curated collection of practical tools for life, work, and learning—so the right utility is always within reach.

Featured app
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Useful tools, ready when you need them

ToolKK

1,000+ free tools for calculations, conversions, images, PDFs, QR codes, JSON, and developer workflows.

  • iOS
  • Android
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Purpose-built

Independent tools

Lightweight apps designed to solve one everyday task exceptionally well

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preDue

Expiry tracking without the guesswork

Track expiry dates, inventory, shopping lists, barcode entries, and reminders in one place.

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NoiseTrace

Professional sound measurement on your device

Measure environmental noise and inspect live audio spectra with precise real-time readings.

  • iOS
  • Android
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New Year Toolkit

Festive tools for Chinese New Year

Practical and festive tools for Chinese New Year greetings, celebrations, and holiday activities.

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Hemiaoji

Local-first AI learning management

Local-first AI learning management for tasks, homework, knowledge, classes, and family-school collaboration.

  • macOS
  • Windows
  • iOS
  • Android
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dayfolio

Your important dates on one continuous timeline

Keep birthdays, anniversaries, plans, and holidays on one timeline with flexible reminders.

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TraceCraft

Printable handwriting worksheets for families and teachers

Create printable worksheets for Chinese, pinyin, English, and pencil-control practice.

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ShowMe

Communication cards for travelling in China

Bilingual cards, Mandarin playback, gesture guides, and emergency content for travel in China.

  • Android
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Device Check Assistant

Check a used phone before you trade

Review device information and run guided checks before buying or selling a used phone.

More focused tools are on the way