About
The gunainaja editorial team consists of full-stack engineers and content strategists with 5+ years of experience in fintech, digital health, and Indonesian SaaS. Every article is manually reviewed for numerical accuracy, references to authoritative sources (government agencies, WHO), and relevant local context.
Areas of expertise
- Fintech and financial calculators (BMI, discount, mortgage)
- Utility tools for everyday tasks
- Digital health (BMI, due date, pregnancy tracking)
- SEO and research-based content strategy
- Full-stack web development (Next.js, Go, PostgreSQL)
Editorial standards
Every article we publish is researched from authoritative sources (WHO, government agencies, industry standards) with concrete calculation examples using real numbers, and reviewed every 6 months or when regulations change. We never publish pure AI-generated content without manual editorial review.
Articles by Tim Hayyu (6)
Image Compression Guide 2026: JPG vs PNG vs WebP Explained
Complete guide to compressing images without losing quality. When to use JPG vs PNG vs WebP, ideal quality settings, batch compression, and free online tools.
Strong Password Guide 2026: How to Create Unhackable Passwords
Complete guide to creating strong passwords in 2026. Why 12345 is instant crack, ideal length, password managers, 2FA setup, and how to generate cryptographically secure random passwords.
Age Calculator Guide: Calculate Exact Age + Western & Chinese Zodiac (2026)
Calculate your exact age in years, months, and days from birth date. Learn how age is computed for official documents, get Western + Chinese zodiac, and see next birthday countdown.
BMI Calculator: Complete Guide + Healthy Weight Formula (2026)
Calculate your Body Mass Index (BMI) with the WHO formula. Learn BMI categories, healthy weight range for your height, limitations, and how to reach a healthy range.
Discount Calculator: How Stacked Discounts Really Work (2026)
Calculate actual savings from discounts. Learn how stacked discounts (30% + extra 10%) don't equal 40% off, spot marketing tricks, and get the real final price.
Due Date Calculator: How to Calculate Your Baby's EDD (Naegele's Rule 2026)
Estimate your baby's due date from your last menstrual period (LMP). Learn Naegele's rule, cycle length adjustment, trimester tracking, and when to expect key pregnancy milestones.