Editor's Review
NTT Docomo's comotto is a family-oriented service aimed at households with children, and this is the guardian's half of it. An adult installs this app, the child uses the companion app on their own device, and the pair are linked so the adult has somewhere to keep an eye on things and to adjust what the child's phone is allowed to do.
Being one side of a paired service is the defining fact about it. On its own the app does very little: it expects a Docomo account, a child's device already enrolled, and a Japanese interface with no alternative offered. That makes it a narrow product, useful to Docomo families in Japan and irrelevant to everybody else. A 4.2 average across a 500K+ install base is respectable rather than glowing, which is typical of paired guardian apps, where the friction of first-time setup dominates the early reviews.
Features
Guardian account that pairs with a child's comotto app
Oversight of how the linked child device is being used
Settings an adult can adjust for the child's device
Japanese interface built around a Docomo account
Pros
Free to install for families already using Docomo services
Keeps the guardian's controls separate from the child's own app
Cons
Does nothing without a paired child device and a Docomo account
Japan only, with a Japanese-only interface
First-time pairing is the step users most often get stuck on
Questions people ask
Do I need a Docomo account?
Yes. The service is built around one and is aimed at Docomo households in Japan. Without that account, and without a child's device running the companion app, there is nothing here to connect to.
Is there an English interface?
No. The app is published for the Japanese market, and its menus and support material are in Japanese.