Tech & Dev Utilities
Essential tools for developers, network engineers, and tech professionals. Calculate subnets, test regex patterns, estimate transfers, convert colors, and more.
Our tech and dev utilities help developers and IT professionals work more efficiently. From network calculations to security assessments, each tool provides accurate results with clear explanations. You might also find our Analyze data correlations, Hex color conversions, Plan across time zones, Calculate SaaS metrics, Estimate transfer times and Calculate probabilities helpful for related calculations.
Tech & Dev Utilities Guide
Last updated: February 6, 2026
Last updated: February 6, 2026
What you can do in Tech & Dev Utilities
- •Calculate IPv4 subnet details: network address, broadcast, host range, wildcard mask, and binary breakdown
- •Test and build regular expressions with live matching, capture groups, and pattern explanations
- •Estimate file transfer times across different connection speeds and protocols
- •Convert between hex, RGB, and HSL color formats with palette generation
- •Calculate image DPI and print dimensions for various paper sizes
- •Assess password strength with entropy calculations and security recommendations
- •Plan API rate limits and throttling strategies for optimal performance
- •Calculate uptime percentages, SLA compliance, and allowed downtime windows
Accuracy, assumptions, and sources
- •IP calculations use standard IPv4 CIDR notation. IPv6 support may be added in future updates.
- •Regex testing uses JavaScript's RegExp engine. Syntax may differ slightly from PCRE or other engines.
- •File transfer estimates assume ideal conditions without network congestion or packet loss.
- •Color conversions use standard sRGB color space. Wide-gamut displays may show slight variations.
- •Password entropy is calculated using character class diversity and length. Dictionary attacks aren't modeled.
- •API rate limit calculations assume uniform request distribution over time windows.
Pick the right calculator fast
- If you need to calculate network subnets and IP ranges→IP Subnet & CIDR Calculator
- If you're testing or building regex patterns→Regex Tester & Pattern Builder
- If you want to estimate download or upload times→File Transfer Time Calculator
- If you need to convert colors between formats→Color Converter & Palette Helper
- If you're preparing images for print→Image DPI & Print Size Calculator
- If you want to check password security→Password Strength Estimator
- If you're designing API rate limiting→API Rate Limit Planner
- If you need to calculate SLA uptime requirements→Uptime & SLA Calculator
Common mistakes to avoid
- •Confusing network address with first usable host—the network address (all host bits 0) is not assignable.
- •Using greedy regex quantifiers when lazy ones are needed, causing unexpected matches.
- •Forgetting protocol overhead when calculating file transfer times (TCP headers, encryption, etc.).
- •Assuming hex colors with 3 digits expand the same way as 6-digit codes (they double each digit).
- •Not accounting for DPI differences between screen (72/96 DPI) and print (300+ DPI).
- •Judging password strength by length alone—character diversity matters more than extra length.
- •Setting API rate limits too aggressively, causing legitimate users to be throttled.
- •Calculating uptime without considering maintenance windows in SLA agreements.
Editorial policy
- ✓All calculators provide estimates for planning purposes, not production configurations.
- ✓Network calculations follow RFC standards for IPv4 addressing and subnetting.
- ✓We don't store any data you enter. All calculations run client-side in your browser.
- ✓Results are formatted for readability but computed with full precision internally.
- ✓Found a bug or have a feature request? Email us at hello@everydaybudd.com.
- ✓Tools are updated when protocols, standards, or best practices evolve.
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Frequently Asked Questions
How accurate is the IP subnet calculator?
Our IP Subnet Calculator uses standard IPv4 CIDR notation and RFC-compliant calculations. It correctly computes network address, broadcast address, host range, wildcard mask, and binary breakdowns. Results match what you'd get from professional networking tools.
Which regex engine does the tester use?
Our Regex Tester uses JavaScript's built-in RegExp engine, which follows ECMAScript specifications. Syntax may differ slightly from PCRE (Perl), Python, or .NET regex engines. Features like lookbehind have limited support in older browsers.
How accurate are file transfer time estimates?
Transfer time calculations assume ideal conditions with consistent bandwidth. Real-world transfers are affected by network congestion, protocol overhead (TCP headers, encryption), server throttling, and connection stability. Add 10-30% buffer for realistic estimates.
What color spaces does the converter support?
Our Color Converter handles HEX, RGB, and HSL formats using standard sRGB color space. Wide-gamut displays (P3, Adobe RGB) may show slight color variations. The tool is ideal for web development where sRGB is the standard.
How does the password strength estimator work?
We calculate password entropy based on character class diversity (lowercase, uppercase, numbers, symbols) and length. Higher entropy means more possible combinations. We don't model dictionary attacks or common password patterns—avoid dictionary words regardless of entropy score.
What's the difference between 99.9% and 99.99% uptime?
99.9% uptime (three nines) allows 8.76 hours of downtime per year. 99.99% (four nines) allows only 52.6 minutes per year. Each additional nine reduces allowed downtime by 10x. Our SLA Calculator shows exact downtime allowances for any percentage.