OJapp Tips
Web Tips from a Tool Developer
How to View Your Web Page on Your Phone — The Easiest Ways for Beginners
A simple beginner-friendly guide on how to view a web page you created on your phone. No server needed. Learn the easiest free methods: online hosting, local Wi-Fi preview, and file transfer.
HTML, CSS, and JavaScript Explained Like You’re 10 Years Old
HTML・CSS・JavaScript の役割を「家づくり」に例えて超やさしく解説。これを読むだけで、3つの違いが一発で理解できます。
iPhone “Add to Home Screen” Missing? How to Fix It in Safari【2026】
Can't find “Add to Home Screen” on your iPhone? Learn why it may be missing from Safari, including image share sheets, in-app browsers, hidden actions, PWA settings, icon issues, and incorrect launch URLs.
JavaScript Isn’t as Free as It Looks: Why Every Action Requires Its Own Script
Many beginners think JavaScript can “do anything,” but each action needs its own script. This article explains why JS feels free yet requires detailed, step-by-step instructions.
PWA vs Shortcuts vs OJapp — What’s the Difference and Which Should You Use?
A complete comparison of PWAs, iOS Shortcuts, and OJapp. Learn how each method adds icons to the Home Screen, their differences in flexibility, sharing, and which option fits your use case.
Shortcut Method vs OJapp: Which Is the Best Way to Add Custom Icons to Your iPhone Home Screen?
Customize your iPhone Home Screen the right way. This guide compares the Shortcut method and OJapp across five key factors—ease of setup, sharing, speed, consistency, and safety—to help you choose the best approach.
Shortcut vs Web App vs OJapp: A Complete Comparison for Home Screen Icon Customization
A detailed comparison of three ways to add websites to your home screen: Shortcut automation, standard Web App “Add to Home Screen,” and the customizable OJapp method. Pros, cons, and best use cases.
The Complete History of iOS WebClip: How Home Screen Icons Evolved and Why the Shadow Cache Exists
A detailed history of iOS WebClip from 2008 to 2026. Learn how home screen icons evolved, why apple-touch-icon was introduced, and how the shadow cache was born.
The Limits of Local Storage: Capacity, Deletion Timing, and Safety Explained
LocalStorage is limited to around 5MB and may be deleted automatically on iPhones. This guide explains storage limits, why data disappears, and how to use localStorage safely.
The Safari Cache Delete Technique Every Web Tool Developer Uses — Why “Clear All” Can Make Things Worse
Safari’s cache shouldn’t be cleared entirely—doing so can break logins and still leave hidden WebClip cache behind. This guide explains the precise, developer-proven method that reliably clears Safari cache for a single website without affecting everything else.
The Truth Behind Paid Apps: Many Are Actually Just Web Pages Inside an App
Many paid apps are actually built with simple web technologies like HTML, CSS, and JavaScript. This guide explains how WebView apps work and why they’re so common.
What CSS Can and Cannot Do: A Beginner-Friendly Explanation
Learn what CSS can and cannot do in web development. A simple guide for beginners explaining visual styling, layout control, animations, and why CSS cannot handle logic, data, or interactions.
What Is a PWA? A Simple Guide to How Websites Become “Apps” on Smartphones
Learn what PWAs are, how websites act like apps on iPhone and Android, how “Add to Home Screen” works, and how PWAs differ from tools like OJapp.
What Is Local Storage? A Simple Guide to Cache, Cookies, and Browser Storage
Feeling your phone is slow or storage is full? This guide explains cache, cookies, and local storage in simple terms—and what happens when you delete each one.
Why iPhone Home Screen Icons Don’t Update: The Hidden “Shadow Cache” in Safari Explained
iPhone home screen icons often fail to update due to Safari’s hidden “shadow cache.” Learn why this happens, how Web Clips store icons, and how to force an update.