Delta, Folium, and Provenance: Which iPhone Emulator Wins in 2026

Two years ago, Apple did something it had spent a decade refusing to do: it let game emulators onto the iPhone. In April 2024, the company rewrote its App Store guidelines to explicitly permit "retro game console emulator apps," and within weeks, three apps arrived to fill a gap that had forced players to jailbreak their phones or fiddle with certificate-signing workarounds just to play a Game Boy Advance game on a commute. Now, in August 2026, those three apps—Delta, Folium, and Provenance—have carved out distinct territories in what should be a straightforward market but isn't, because each one plays by different rules on price, region, and raw speed.

Delta came first, built by Riley Testut, the same developer who created AltStore, the sideloading platform that existed precisely because Apple wouldn't allow emulators through official channels. Delta is free, polished, and focused: it handles Nintendo handhelds and consoles from the NES through the Nintendo DS, plus Sega Genesis, and it does all of it at full speed on modern hardware. For most people, Delta is the obvious choice. But Delta has a geographic problem. Because of the European Union's Digital Markets Act, Apple treats the EU as a separate distribution zone, and Delta's official App Store listing doesn't exist there. EU users have to install AltStore PAL first—a legitimate, Apple-sanctioned alternative marketplace, not a jailbreak—register an Apple ID with it, and re-sign the app roughly every year. A player in Toronto downloads Delta from the App Store in under a minute. A player in Berlin has to jump through an extra hoop that shouldn't exist.

Folium fills a gap that nobody else touches: it is, as of August 2026, the only Nintendo 3DS emulator Apple has approved for the App Store. That single fact explains its entire customer base. Nobody buys Folium for its NES or SNES support, which Delta and Provenance both offer for free. They buy it because it's the sole legal, non-sideloaded way to play Pokémon X and Y or Fire Emblem Awakening on an iPhone without touching AltStore. Folium costs $4.99, a price that makes sense only because there is no free alternative for the system it covers. But Folium's App Store reviews are noticeably rougher than Delta's. Users report crashes on specific titles, inconsistent performance, and a forced-landscape mode that annoyed players who preferred portrait play. The core problem is Apple's sandbox: 3DS emulation relies on just-in-time compilation to translate ARM11 instructions fast enough for full speed, but Apple doesn't allow JIT by default. Community benchmarks put standard App Store builds of Folium at roughly 40 to 70 percent of full frame rate depending on the title, while sideloaded builds with JIT enabled hit closer to 90 to 100 percent. A game that should run at 30 frames per second can drop into the teens on a stock App Store install. Folium is the only option for its niche, but it's also the rockiest experience of the three.

Provenance is the generalist. It wraps more than three dozen individual emulator cores into a single interface, meaning a player's Atari 2600 collection, SNES library, Genesis carts, and original PlayStation discs can all live in one app with one set of save states. Since March 2026, Provenance has offered iCloud sync spanning iPhone, iPad, and Apple TV, so saves stay consistent across devices. The tradeoff is size and complexity: Provenance's install weighs around 2.5 gigabytes because it bundles so many cores up front, which matters if someone is still running a 64 GB iPhone. It also requires iOS 16 or later, a slightly higher bar than Delta's iOS 14 minimum. For anyone whose retro library spans several console generations, though, Provenance is the closest thing to a one-app solution on iPhone in 2026.

The performance picture is clear once you look at the numbers. Delta's N64 and DS emulation runs at full speed on most titles going back to devices with Apple's A12 chip, meaning any iPhone from the last several generations clears that bar comfortably. Provenance's PS1 core runs at full speed on modern hardware without needing JIT, since the original PlayStation's MIPS R3000 CPU is a far lighter emulation target than the 3DS's dual-core ARM11. The practical takeaway is this: if a library consists of N64, DS, PS1, or anything 16-bit and earlier, expect full speed out of the box on any of these three apps on modern hardware. If the library is 3DS, expect Folium to work, but expect to sideload it with JIT enabled if full console-accurate frame rates matter on anything more demanding than a 2D platformer.

There is no single winner here, and pretending otherwise would ignore how differently these three apps are built. If forced to pick one default recommendation for most readers, it's Delta: free, stable, actively maintained, and covering the systems that make up the bulk of most people's retro libraries. But "best overall" is not the same as "best for you." If a library is 3DS-heavy, Folium's $4.99 is the only legal App Store route to that system, full stop. If a collection spans PS1 alongside the usual Nintendo systems, Provenance's free price and 38-plus system count make it the more complete single-app solution, provided there is 2.5 gigabytes of storage to spare. The realistic setup for a lot of readers ends up being two apps rather than one: Delta or Provenance for the free, broad coverage, plus Folium specifically for 3DS titles neither of the others touches. Layer in the EU distribution wrinkle, and the honest answer to "which is best" is "check your library and your region before you check the App Store."