Delta

Delta is an emulator for iOS and iPadOS that brings multiple game systems into one app. Its listed systems are NES, SNES, Nintendo 64, Game Boy and Game Boy Color, Game Boy Advance, and Nintendo DS. You import supported game files into a library; documented formats also include Sega Genesis. Delta offers manual, automatic, locked, and preview save states, though its guide recommends in-game saves as more reliable. Delta Sync can sync games, saves, skins, and BIOS files through Google Drive or Dropbox. Delta files are not visible in Google Drive, and editing files visible in Dropbox may cause data loss. Compatible Nintendo DS games can connect to community-hosted Nintendo WFC servers through a listed server or custom DNS. The app works with compatible controllers and keyboards, including Xbox, PlayStation, and Nintendo controllers, and supports button remapping. It is open source and free with in-app purchases. The official guide directs users in EU countries to AltStore PAL and users elsewhere to the App Store.

Delta combines several game systems, flexible save options, and controller support in an iOS and iPadOS emulator. Users should note its platform limits and the guide’s cautions about saves and Dropbox files.

Delta suits iOS and iPadOS users who want to organize supported game files and play with compatible controllers or keyboards. Its sync and save options may also suit people who want to manage game data across devices.

Delta is an iOS and iPadOS emulator for players who want several classic game systems in one app. Its broad system support, save-state options, and controller compatibility make it a strong fit for Apple-device users; Android players should look elsewhere.

Overview

Delta is the successor to GBA4iOS and brings NES, SNES, Nintendo 64, Game Boy, Game Boy Color, Game Boy Advance, and Nintendo DS emulation together. Users import their own ROM files into a library, and documented file formats also include Sega Genesis. That makes Delta a useful single-app option for players with games across multiple systems, though it does not include games.

The project is open source and does not require BIOS files. Those traits reduce setup friction, but they do not change the need to supply ROM files. Delta's official guide directs users in EU countries to AltStore PAL and users outside the EU to the App Store.

Key features

Library, saves, and sync

Delta supports manual, automatic, locked, and preview save states, giving players different ways to capture and protect progress. The guide recommends in-game saves as more reliable, however, so players should not rely on save states as their sole record.

Delta Sync can sync games, save files, skins, and BIOS files through Google Drive or Dropbox. The storage behavior calls for care: Delta files are not visible in Google Drive, while Dropbox files are visible but should not be edited because doing so may cause data loss.

Play and controls

Compatible Nintendo DS games can connect to community-hosted Nintendo WFC servers. Players can choose a listed server or enter a custom DNS, a useful option for those seeking online play without limiting themselves to a preset choice.

Delta works with iOS-compatible controllers and keyboards, including listed Xbox, PlayStation, and Nintendo controllers, and supports button remapping. That flexibility suits players who prefer physical controls or want to adjust a layout, though the experience is limited to compatible Apple accessories.

Linking a Patreon account can provide experimental features and alternate app icons. Downloading the full beta requires AltStore PAL or AltStore Classic, so Patreon benefits do not by themselves remove the separate installation requirement.

Pricing

Delta is free: its Delta plan costs nothing and is described as a free app with in-app purchases. A free plan makes it an easy starting point for players who want the emulator's core offering without a subscription price. Patreon linking can provide experimental features and alternate icons, but the full beta requires AltStore PAL or AltStore Classic.

Platforms

Delta is available for iOS and macOS, with official distribution guidance pointing EU users to AltStore PAL and users outside the EU to the App Store. It does not support Android, so it is not the right choice for Android-only players.

Who it's for

Delta best suits Apple-device players who want one emulator for multiple classic systems, configurable controller input, and optional cloud syncing. It is less suitable for users who want Android support, expect the app to supply games, or need save states to be their only dependable way to preserve progress.

Pros and cons

• Pros: Support for seven named game systems and documented Sega Genesis file formats makes one library practical across a varied collection.
• Pros: Manual, automatic, locked, and preview save states offer useful flexibility, while in-game saves remain the recommended reliable option.
• Pros: Google Drive or Dropbox sync covers games, saves, skins, and BIOS files; controller and keyboard support includes button remapping.
• Cons: Android is unsupported, excluding users who need an Android emulator.
• Cons: Dropbox files should not be edited, and Google Drive does not show Delta files, which limits straightforward file management.
• Cons: Users must import ROM files, and save states are not recommended as the most reliable save method.

Alternatives

For Android-only Nintendo DS play, nds4droid is a free, ad-free Android option. iDroidDS is another free, open-source Android choice for readers who value contributing to the project. If broad platform reach matters more than Delta's Apple focus, SkyEmu runs on Android, iOS, Linux, macOS, web, and Windows, though its DS emulation is beta quality.

3Beans is a free option across Android, iOS, Linux, macOS, and Windows. DSVita is another free choice for Android and Linux users, while WatermelonDS and ANDSemu are free Android alternatives.

Readers narrowing their search by system can browse Nintendo DS Emulators, Game Boy Advance Emulators, Sega Genesis Emulators, and Nintendo 64 Emulators. For a broader comparison, see Multi-System Emulators.

Verdict

Choose Delta if you want a free, open-source emulator that brings several classic systems, controller support, and optional syncing to Apple devices. Its strongest case is breadth in one app; look elsewhere if you need Android support or want save states and Dropbox files to be a worry-free substitute for in-game saves and careful file handling.