Delta has become the easiest way to play Nintendo classics on iPhone.
If you want to run Game Boy, GBA or DS games properly on iOS, this guide walks you through the full setup process, explains what you need, and shows how to get the best performance.
What Is Delta Emulator?
Delta is an iOS emulator that allows you to play classic Nintendo systems directly on your iPhone.
It supports:
- NES
- SNES
- Game Boy
- Game Boy Color
- Game Boy Advance
- Nintendo DS
It runs natively on iOS and works smoothly on modern devices.
Check out our other blog for more information on emulators first.
Is Delta Legal?
The emulator itself is legal software.
The legal grey area applies to game files. You should only use ROMs for games you legally own and have backed up yourself.
How to Install Delta on iPhone
Step 1: Download Delta
Search for “Delta Emulator” in the Apple App Store and install it directly.
If it is temporarily unavailable in your region, you may need to use alternative distribution methods such as AltStore. Always use official sources.
Step 2: Import Game Files
Open Delta and tap the + icon.
Select your ROM file from Files or iCloud Drive. Delta automatically sorts games by system.
Step 3: Install DS BIOS Files (For Nintendo DS Only)
If you plan to play Nintendo DS games, you’ll need BIOS files. Delta will prompt you to add them in Settings.
Without BIOS files, DS games will not launch.
Step 4: Adjust Settings
Go to Settings and review:
- Controller options
- Audio latency
- Screen layout
- Save state configuration
Default settings work well for most users.
How to Improve Performance
If games feel slow or unresponsive:
- Close background apps
- Disable Low Power Mode
- Lower screen scaling if available
- Restart the app
Most iPhones from the last five years handle GBA and DS titles without issues.
Using a Controller with Delta
Touch controls work, but older games were designed for physical buttons.
You can connect a Bluetooth controller through iOS settings. Delta automatically detects most modern controllers.
A stretch-style mobile controller turns your phone into a proper handheld setup and removes the awkward “controller plus loose phone” feeling.
We're biased, but we'd recommend our own controller, duh.
Final Thoughts
Delta makes retro gaming on iPhone simple again. Once installed correctly, it runs smoothly and supports external controllers for a more natural experience.
If you haven’t already, read our complete guide to retro emulation on iPhone and Android to understand the wider setup and performance considerations.
