Defaultify
Android Default Apps & System Hub
Take total command of default apps, file associations & deep links.
Tired of Android opening files and links in the wrong application? Defaultify gives you total clarity and effortless 1-tap control over system roles, 100+ file extensions, deep links, and OEM device defaults in a refined Material 3 dashboard.
Why Circuit & Moss Built Defaultify.
Android has always championed user sovereignty—you can install any browser, gallery, or dialer you desire. Yet as major manufacturers layered their own proprietary skins (Samsung One UI, Xiaomi HyperOS, OnePlus OxygenOS, and Google Pixel), configuring which application opens what became a labyrinth buried under five layers of nested settings menus.
At Circuit & Moss Labs, we believe tools should honor human intentionality. We combined Circuit logic (hardware OEM detection, Android intent-filter inspection, package manager APIs) with Moss philosophy (calm, zero-bloat UX, zero telemetry tracking, and total local data ownership). Defaultify restores complete sovereignty over your device.
Defaultify in Action.
Crafted in Material 3.
Explore the 5 core mobile workflows designed for effortless app delegation and conflict resolution.
Master Your Default Apps
Configure browsers, dialers, SMS & assistants in 1 tap
Instantly audit and reassign your default browser, dialer, SMS messenger, spam filter, and home launcher without digging through manufacturer sub-menus.
Master Your Default Apps
Configure browsers, dialers, SMS & assistants in 1 tap
Manage 100+ File Handlers
Set defaults for PDF, Office, Media, Archives & Code
Deep Link & Intent Tester
Inspect URLs, URI schemes and app links before opening
Health Score & Conflict Alerts
Detect missing defaults and resolve conflicts instantly
Profiles & Instant Backup
Switch between Work, Minimal and Media setups in seconds
Total System Clarity.
Engineered from clean architecture principles for instant response times and deep hardware synergy.
1-Tap System Roles
Directly audit and reassign high-priority Android system roles: Web Browser, Phone/Dialer, SMS Messenger, Home Launcher, AI Digital Assistant, and Contactless NFC Wallet.
100+ File Extensions
Comprehensive inspection across Documents (PDF, Office), Developer Code (JSON, MD, Python, HTML), 3D Printing (STL, OBJ), AI Datasets, eBooks, Media, and Security Keys.
OEM-Aware Setup Guides
Detects device manufacturer hardware (`Build.MANUFACTURER`) and dynamically tailors navigation instructions for Samsung One UI, Google Pixel, Xiaomi HyperOS, and OnePlus OxygenOS.
System Health Audit
An intuitive 0–100% device health metric that continuously audits configured defaults vs unassigned extensions, identifying missing handlers and conflicting application intents.
Local Profiles & JSON Backup
Save default configurations as named profiles (Work, Personal, Minimalist) and export clean JSON backups to easily restore or replicate your setup across new devices.
Deep Link & Intent Inspector
Test web links, app links, and custom URI schemes (`mailto:`, `tel:`, `geo:`, `upi:`) before they trigger to see precisely which installed app catches the intent.
Skin-Aware Navigation for Every Android.
Android manufacturers relocate default application toggles across disparate sub-menus. Defaultify detects your device model upon launch and presents step-by-step instructions matched specifically to your Android version.
Samsung One UI
Settings → Apps → Choose default apps → Set as default / Clear defaults. Direct deep link provided.
Google Pixel
Settings → Apps → Default apps → Open by default → Supported links. Clean native stock resolver.
Xiaomi HyperOS
Security App → Manage Apps → 3 Dots Menu → Default Apps → Advanced Association permissions.
OnePlus / OPPO / Vivo
Settings → Apps → Default App Management → Opening Links → Disable auto-intercept per app.
Supported Formats & Handlers.
From ubiquitous office documents to cutting-edge developer code and 3D geometries.
| Category Group | Extensions & Protocols Handled | Access Tier |
|---|---|---|
| Documents & Office | PDF, DOCX, XLSX, PPTX, CSV, RTF, TXT | Core Included |
| Code & Developer | JSON, Markdown, Python (.py), HTML, YAML, SQL, Kotlin, Shell (.sh) | Pro Unlocked |
| 3D Printing & CAD | STL (.stl), 3D Wavefront OBJ (.obj), GLTF (.gltf) | Pro Unlocked |
| AI & Data Science | Prompt Templates (.prompt), Vector JSONL (.jsonl), Subtitles (.srt) | Pro Unlocked |
| E-Books & Readers | EPUB (.epub), Kindle (.mobi), Comic Archives (.cbz) | Core Included |
| Media & Audio/Video | MP4, MKV, MP3, FLAC, WebP, SVG, HEIC, DNG Raw | Core Included |
| Archives & Installers | ZIP, RAR, 7-Zip, TAR, APK Package Installer | Core Included |
| Security & Crypto | KeePass (.kdbx), PGP Keys (.gpg), Bitcoin URI, Ethereum URI, UPI | Pro Unlocked |
Modern Android Stack
100% Free Core Utility
All essential default management features—System Roles, basic file extensions, OEM guides, and health scoring—are completely free forever. Optional Pro unlocks power-user categories and intent debugging.
Restore Control of Your Phone.
Install Defaultify on your Android smartphone today and take instant command over your file handlers and system apps.