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DevBox Tools

Online tools for product and data analysts

Online utilities for calculations, data analysis, and hypothesis testing in product analytics.

Sample Size Calculator

Calculate the required sample size

  • 🔢 Sample size determination
  • 📊 Flexible calculator
  • 📈 Save results

Chi-Square Test

Perform a statistical chi-square test

  • 📊 Statistical analysis
  • 🔢 AB test result analysis
  • 📈 Save results

Two-Sample T-Test

Compare the means of two samples

  • 📊 Mean comparison
  • 📈 Statistical testing
  • 📉 Save results

Sample Ratio Mismatch Calculator

Calculate SRM (Sample Ratio Mismatch) for A/B testing

  • 📊 Statistical analysis
  • 🔢 Ratio comparison
  • 📈 SRM detection

Sequential Sampling Calculator

Calculate Sample Size for Sequential Testing in A/B Tests

  • 📊 Statistical analysis
  • 🔢 Speed up hypothesis testing
  • 📈 Sequential testing

Regex Tester

Test and validate regular expressions

  • 🔍 Regex testing
  • 📝 Pattern matching
  • ✅ Result validation

Timestamp Converter

Convert timestamps between different formats

  • 🔄 Timestamp conversion
  • 📅 Date formatting
  • 📈 Ready and flexible templates

Bulk URL Opener

Open multiple links at once with a single click

  • 📋 List operation
  • 🔗 Open all at once
  • 🗂 Bulk processing

URL Decoder

Decode URL-encoded strings

  • 🔄 Encode/Decode
  • 🔓 URL format support
  • 📝 Special characters

Redirect Checker

Check URL redirects and see where they lead

  • 🔍 Redirect analysis
  • 🌐 Chain checking
  • 📄 Response codes

QR Code Generator

Create QR codes for various data

  • 📱 QR code generation
  • 🎨 Custom style
  • 💾 Multiple formats

UTM Generator

Create UTM tags to track marketing campaigns

  • 🛠 UTM tag generator
  • 📊 Traffic analysis
  • 🌐 Ad system templates

Pomodoro Timer

Manage your time efficiently using the Pomodoro technique

  • 🕒 Productivity boost
  • 📝 Time settings
  • ✨ Notifications