❓ What is changing?
On August 25, 2026, Japan's Digital Agency announced that it had begun providing the smartphone app "Myna App". This is not an additional, separate app: it is the new name of the app previously offered as the "My Number Portal app". The official page itself carries the former name in brackets — "Myna App (formerly My Number Portal app)".
The role of the app is unchanged. It uses your smartphone's NFC function to read your My Number Card and serves as the gateway for logging in to Mynaportal, the online counter for administrative procedures. Through Mynaportal you can check administrative records that relate to you and file certain applications and notifications online.
For users, the practical difference is what the app is called and how you find it. If you used to search the app store for "My Number Portal app", the listing will now appear under the new name. Details such as how the change appears on a device where the app is already installed, supported OS versions, and any points to note when moving over should be confirmed on the Digital Agency's official page. A renaming is also a moment when fake apps and fake sites tend to appear, so pay attention to where you download from.
🌏 Impact on foreign residents
Even a simple rename makes an app harder to find if you are searching in Japanese. City hall counters, schools and workplaces are likely to keep saying "install the My Number Portal app" for a while, but the store listing now reads "Myna App". Knowing that both names refer to the same thing saves you from searching again or installing something twice.
A renaming is also a window in which fake apps and fake sites slip in. If subtle differences in Japanese wording are hard for you to judge, make it a habit to install only from the official store or from links on the Digital Agency's official page — not from ad slots in search results or links circulating on social media.
On the procedural side, if you forget the 4-digit password used to read the card, you must go to a counter in person, which means dealing with the process in Japanese. Logging in once while you have time — rather than during a move or a residence procedure — is the safer approach.
💡 Key points to remember
1Search the app store under the new name "Myna App" — it is the same app formerly called the "My Number Portal app".
2Check the Digital Agency's official page for the latest guidance on devices that already have the old app, supported OS versions, and points to note when moving over.
3To log in you need your My Number Card and the 4-digit PIN for the user authentication certificate that you set when you received the card.
4The 4-digit PIN locks after repeated wrong entries. To unlock or reset it, go to the counter of the municipality where you are registered as a resident.
5You need an NFC-capable smartphone to read the card. If reading fails, remove the phone case and try changing where you hold the card.
6Install only from the official store or via links on the Digital Agency's official page — beware of fake apps and sites riding on the name change.
7Your My Number Card and its electronic certificates have expiry dates. When a renewal notice arrives, handle it at your municipal office early.
Source:
Digital Agency website (Launch of the Myna App)This article was edited and written by freegent Inc. based on the source above.