TeaFun groups browser-based tools for quick checks, developer workflows, calculators, converters, planners, and lightweight utilities into one place. The goal is simple: open a page, get a useful answer quickly, and move on without creating an account.

Most tools are designed to run locally in your browser, which makes TeaFun useful for setup checks, pasted data, calculations, and draft workflows when you want speed, privacy, and zero setup.

Why people use TeaFun

Browser-first by default

Many TeaFun tools run entirely on your device, so tokens, pasted text, draft content, and hardware input do not need to leave your browser.

Coverage that spans real workflows

The catalog mixes setup checks, developer utilities, calculators, converters, planners, and everyday helpers so the site works as a broad tool hub instead of a single-topic project.

Fast to scan, fast to use

Pages aim to explain what a tool does, when to use it, and what result to look for without forcing sign-up walls or long setup steps.

Browse

Browse by what you need to do

If you already know the kind of problem you are solving, jump into a category first. Each collection groups related tools and makes it easier to compare the right options.

14 tools

Gaming Tools

Test your gaming hardware and skills. Reaction time, click speed, aim training, and more.

0 tools

Fun Tools

Fun quizzes and viral tools to share with friends.

10 tools

Developer Tools

Developer utilities — converters, builders, and checkers.

10 tools

Calculators

Free online calculators for everyday math and conversions.

Search the tool hub

Reaction Speed Test

Test your reaction time with a five-round click challenge.

Gaming Input Mouse

CPS Test

Measure your clicks per second with multiple test durations.

Gaming Input Mouse

Visual Memory Test

Test your visual memory by remembering grid patterns of increasing difficulty.

Gaming Study Input

Aim Trainer

Train your aim speed and accuracy by clicking targets as fast as you can.

Gaming Input Mouse

Gamepad Tester

Test your controller inputs, check for stick drift, and set custom deadzones. Runs entirely in your browser.

Gaming Input Controller

Keyboard Heatmap

Track your most-used keys in real time, build a heatmap from actual typing, and export the result as a PNG.

Gaming Input

Typing Speed Test

Test your typing speed and accuracy with a gaming-themed typing challenge.

Gaming Input Text

Monitor Refresh Rate

Detect your monitor's refresh rate in your browser.

Gaming Display Color

Color Blindness Test

Test your color vision with Ishihara-style plates optimized for gamers.

Gaming Display Color

Spacebar Counter

How fast can you press the spacebar? Test your spacebar speed.

Gaming Input

Number Memory Test

How many digits can you memorize? Test your number memory span.

Gaming Study Input

Mouse Double-Click Tester

Detect if your mouse has a double-click problem. Click 20 times and we'll flag any unintended double-clicks from a worn-out microswitch.

Gaming Input Mouse

Mouse Acceleration Detector

Find out if your OS mouse acceleration is active. Move slowly then quickly — we analyze your cursor's nonlinearity.

Gaming Input Mouse

Mouse Sensitivity Converter

Convert your mouse sensitivity across 50+ games instantly. Enter your DPI and sensitivity to see your cm/360° and equivalent settings in every game.

Gaming Input Mouse

ENV / Shell / Docker Converter

Convert .env files to JSON, YAML, TOML, shell export, and Docker ENV instantly in your browser. Nothing is uploaded — all conversion is client-side.

Data Conversion

JSON Formatter & Validator

Format, validate, and minify JSON instantly in your browser. Zero network requests — your data never leaves your device.

Data Formatting Text

JWT Decoder

Decode JWT headers and payloads locally in your browser. Inspect claims, expiry, issuer, and timestamps without sending tokens anywhere.

Data Security Text

Base64 Encoder / Decoder

Encode and decode Base64 locally in your browser. Supports text conversion, URL-safe Base64, and file-to-Base64 export.

Data Conversion Security

Cron Expression Builder

Build cron expressions visually for Unix, Quartz, AWS EventBridge, and GitHub Actions. Preview upcoming run times instantly in your browser.

Planning Productivity

Structured Data Converter

Convert YAML, JSON, and TOML locally in your browser with multi-document YAML support and anchor resolution.

Data Conversion Formatting

HTTP Security Headers Checker

Paste raw response headers or curl -I output to review common security headers locally, including CSP, HSTS, and COOP.

Data Security

Log Formatter

Paste JSON, nginx, Docker, syslog, or plain logs to normalize, filter by level, and inspect them locally in your browser.

Data Formatting Text

Aspect Ratio Calculator

Calculate aspect ratios instantly. Convert dimensions, solve for missing sides, and browse 2025/2026 social media image sizes.

Display Design Layout

Salary Calculator

Convert salary to hourly rate instantly. Calculate annual, monthly, weekly, daily, and hourly pay with configurable working hours and leave days.

Finance Planning

Tip Calculator

Calculate tips and split bills instantly. Choose your currency, add an optional service charge, and share the per-person breakdown.

Finance Planning

Reading Time Estimator

Estimate reading and speaking time instantly. Paste any text to get word count, character count, reading time, and speaking time — CJK-aware.

Text Study

Color Palette + WCAG Checker

Check contrast ratios, AA/AAA compliance, generate palette variants, and export CSS or Tailwind v4 color tokens locally.

Color Design Display

GPA / Final Grade Calculator

Calculate the final exam score you need, run GPA what-if scenarios across multiple grading systems, and export a verdict card locally.

Study Planning

Floor Plan Tool

Lay out a room in 2D, drag furniture into place, rotate selected items, and export a clean PNG with no account or watermark.

Design Layout Planning

Invoice Generator

Create a client-ready invoice with your branding, taxes, and line items, keep drafts locally, and download a clean PDF with no watermark.

Finance Text Productivity

Net Worth Tracker

Track assets, liabilities, and net worth locally with flexible account fields, currency selection, history snapshots, and CSV export.

Finance Planning Productivity

TDEE Calculator

Estimate your daily calories with Mifflin-St Jeor, compare Harris-Benedict, and get macro targets you can bookmark.

Health Planning

ADHD Task Prioritiser

Paste your task list, answer three low-friction questions, and get one next task to do right now.

Productivity Planning Study

Cover Letter Builder

Build a tailored cover letter with three templates, instant preview, and PDF download in your browser.

Text Productivity Study

Workflow

How to get value from the hub

Start with the job, not the brand

Search for the task you need to complete, or open a category page if you want to compare several related tools before choosing one.

Use the result immediately

TeaFun focuses on quick outputs: a validated payload, a hardware check, a benchmark, a calculation, or a simple file you can export and keep.

Follow related tools when your workflow expands

Many jobs happen in sequence. You might format JSON, decode a token, estimate a total, and then jump to headers, logs, or another calculator as the workflow expands.