YuanqiZhiKe Toolkit - Free Offline Tools, Verifiable by Design

Verifiable by design. Private by default. YuanqiZhiKe Toolkit is a collection of 800+ browser-based tools for everyday calculation, conversion and text work. Every tool runs entirely in your browser: nothing is uploaded, nothing is tracked, and every result is deterministic - you can reproduce it and check it. No registration, no hidden fees, no data collection.

For Teams: Verifiable, Private Computation

AI can produce a number. It cannot show your compliance team how that number was reached, and in most regulated workflows it is not allowed to touch personal data at all. That gap is what we build for: deterministic calculations that run on your own machine, with inputs, formulas and outputs you can audit line by line.

Data Masker - Redact emails, phone numbers, national IDs and card numbers before a text goes anywhere near a third-party model. Runs locally; the original never leaves the page.
Amortization Schedule Generator - Full repayment schedule with per-period interest, principal and balance, so the numbers can be checked one row at a time.

Need this inside your own product or workflow? See our custom development services, or contact us.

AI Tools

17 AI-assisted tools that run in your browser — writing, research, translation, detection and business analysis. Same rule as everything else here: your text is processed in the page, not uploaded.

AI Business Intelligence

Data Insight Writer - Paste raw KPIs and get three insight angles instantly: a dry objective summary, a narrative story, and a recommended next step.
Excel Formula Generator - Describe any spreadsheet task in plain English and get a ready-to-paste Excel or Google Sheets formula with explanation and a worked example.
KPI Definition Generator - Type a metric name and get three definition variants — Strict, Standard, Broad — each with formula, data source, meaning, and watch-outs.
Report Summarizer - Paste any business report—weekly update, earnings note, or project status—and get a structured executive summary with TL;DR, key findings, risks, and recommendations.
SQL Query Generator - Translate plain English into executable SQL across five dialects.

AI Career

AI Cover Letter Generator - Type the job title, company, and your career highlights, then pick a tone to get a ready-to-send cover letter.
Interview Question Generator - Generate 10 tailored mock interview questions for any role — behavioral, technical, situational, and culture-fit.

AI Detection

AI Content Detector - Scores text against five signals—AI buzzword density, sentence-length variety, em-dash frequency, vocabulary diversity, transition-word balance—yielding a machine-authorship probability.
Plagiarism Similarity Checker - Side-by-side text overlap checker that highlights exact shared phrases between two documents.
Readability Score - Measure how hard your text is to read using three complementary formulas: Flesch Reading Ease, Flesch-Kincaid Grade, and Gunning Fog.
Tone Emotion Analyzer - Drop in any text and get an instant three-way sentiment split, six tone scores (formal, friendly, angry, humorous, worried, joy), and the most emotionally charged words.

AI Translation

Academic Translator - Translates research papers while preserving technical terminology.
Business Email Translator - Converts professional emails into natural-sounding translations across six languages.
Marketing Copy Translator - Translate ad headlines, product pages, and email subjects into six target markets simultaneously.
Tone-Aware Translator - Convert English text into formal, casual, or friendly registers in six target languages.
Translate And Summarize - An AI workflow that processes long text by generating a target-language summary first.

AI Writing

AI Rewriter - Paraphrase sentences, paragraphs, or articles in three modes — Standard, Fluency, Creative — with a three-level intensity slider.

See the full AI collection on the AI tools page.

Popular Tools

Tip Calculator - Work out a tip, add tax, split the bill and round the result, with regional presets and nothing sent off your device.
QR Code Generator - Turn any text or URL into a scannable QR code, with adjustable size and error-correction level, generated entirely offline.
Data Masker - Strip emails, phone numbers, IDs and card numbers out of a text before you share it, with the whole redaction done in the page.
Amortization Schedule Generator - Build a full repayment schedule you can check row by row: interest, principal and closing balance per period.

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Why Use YuanqiZhiKe Toolkit?

Verifiable - Every result is deterministic, and can be reproduced and checked by hand
100% Free - No registration, no subscriptions, no hidden fees
Private by Default - Nothing is uploaded; all computation happens inside your browser
Works Offline - Use any tool even without internet
Open Source - All tools are open-source and freely modifiable
Multi-Language - Available in 6 languages

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