What Is Project Kaeru and Which Nintendo Revival Services Does It Provide?

Updated

Project Kaeru is the Kaeru Team's umbrella effort to reverse engineer and run replacement network services for discontinued Nintendo and mobile apps. The team describes its goal as giving old systems new life "even when Nintendo no longer provides support for them," and preserving significant user-generated content. It covers five named services: Kaeru Gallery (Flipnote Studio 3D), Kaeru WFC (Nintendo DS online play via Wiimmfi), Kaerutomo (Miitomo), Kaeru Duel (Pokémon Duel), and Kaeru Patcher (an Android app for connecting supported apps to these revival services). Setup differs by platform — Android uses a patcher app, while iOS requires a jailbroken device and tweaks.

Why Project Kaeru Exists

When Nintendo shuts down a game's or app's online infrastructure, the client software often still works but has nothing to connect to. Kaeru Team reverse engineers the original network protocols and stands up replacement servers, so the same apps can talk to a live service again. Two motivations run through the project descriptions:

  • Restoring online functionality — bringing back features like online play or gallery browsing after official shutdown.
  • Preserving user-generated content — keeping content that users created inside these services accessible rather than losing it with the servers.

The Services at a Glance

Service Target What it does Platform notes
Kaeru Gallery Flipnote Studio 3D Replacement server for the app —
Kaeru WFC Nintendo DS Enables online play using Wiimmfi No homebrew or romhacks required
Kaerutomo Miitomo Custom server that makes the app functional again after shutdown —
Kaeru Duel Pokémon Duel Replacement server restoring online functionality after shutdown —
Kaeru Patcher Supported Android apps Patches legitimate installations to connect to revival services Android app
Kaeru Team Repo iOS Enables revival services via tweaks Requires jailbroken iOS device

How the Setup Differs by Platform

The team's own descriptions make clear there is no single universal install method:

  • Nintendo DS (Kaeru WFC): the notable point is that it works without homebrew or romhacks — it routes online play through Wiimmfi.
  • Android (Kaeru Patcher): an app that patches legitimate installations of supported apps so they connect to the revival services. This means you keep the official app and modify how it connects, rather than installing a rebuilt client.
  • iOS: because of Apple's security model, the team states users need a jailbroken device; the revival services are enabled through tweaks. If your device isn't jailbroken, this route isn't available to you.

For the individual services, the site points to per-project "More details" pages rather than one shared guide, so the exact steps depend on which service and platform you're targeting.

Who Runs It

Kaeru Team lists its members publicly:

  • Lauren Kelly (thejsa) — Team lead; Kaeru Gallery developer (United Kingdom)
  • Shutterbug2000 — Reverse engineer; Kaerutomo and mobile server developer (United States)
  • FairPlay137 — Kaerutomo development
  • JoshuaDoes — Development (United States)

How to Decide Which Service You Need

Match your situation to the service rather than assuming one method fits all:

  • You want Flipnote Studio 3D sharing back → look at Kaeru Gallery.
  • You want DS games online again with minimal setup → Kaeru WFC, since it needs no homebrew or romhacks.
  • You want Miitomo working → Kaerutomo.
  • You want Pokémon Duel online again → Kaeru Duel.
  • You're on Android and want to connect supported apps → Kaeru Patcher.
  • You're on iOS → check whether your device is jailbroken first; without that, the tweak-based route isn't open to you.

Because setup details and supported-app lists can change, check the specific project page on the Kaeru Team site for current instructions before starting.