Terms of use

Effective November 5, 2026

These terms set out the rules for using the Akari iPhone app (the “App”) provided by yssdev (“we,” “us,” or “our”). Please read them before using the App. By using the App, you are deemed to have agreed to these terms.

1. About the App

1. The App lets you turn on a light while you care for a crying baby at night, see on a globe the lights of others who are awake right now, just like you, and send and receive stickers.
2. Besides users' lights, the globe shows lights that we place (Akari's lights) so that nights when few people are awake do not feel lonely. Akari's lights may respond to stickers. Akari's lights are not included in the number of people shown.
3. The number of people and the number of stickers received are counted from records that reach our servers. They may be shown with a delay or differ from the actual numbers.

2. Not medical advice

The App does not provide medical advice or diagnosis. If your baby does not seem like their usual self or seems unwell, please contact a healthcare provider or a children's health advice line in your area. In an emergency, call your local emergency number.

3. Account

1. The App automatically creates an anonymous account for each device. You do not need to provide a name or email address.
2. You can delete your account at any time from “Settings” › “Delete account” in the App. The Privacy Policy describes what is deleted and what remains.

4. Fees and payment

1. The App is free to use. You can buy sticker sets and light colors as one-time in-app purchases.
2. “Unlimited” is an auto-renewable monthly or yearly subscription that gives you access to all paid sticker sets and light colors. First-time subscribers are eligible for a 1-week free trial.
3. Payment is charged to your Apple Account when you confirm your purchase. Unless you cancel at least 24 hours before the end of the current period, your subscription automatically renews for a period of the same length at the same price, and the fee for the next period is charged within the 24 hours before the current period ends. If you cancel during the free trial, you will not be charged.
4. You can cancel from Subscriptions in the iPhone Settings app, or from “Manage subscription” on the “Unlimited” screen in the App.
5. Payments are made through Apple's App Store and are subject to Apple's rules. Prices are those shown on the App Store. Refunds are subject to Apple's rules; please request them from Apple.
6. After your Unlimited subscription ends, you can use only the sticker sets and light colors you bought as one-time purchases.
7. On any device signed in with the same Apple Account, you can restore your purchases from “Settings” › “Restore purchases” in the App.

5. Prohibited conduct

You must not do any of the following:

1. Violating laws or regulations, or acting against public order
2. Accessing the App or our servers without authorization, or sending requests to our servers without using the genuine App
3. Placing a burden on our servers by sending large numbers of requests through automated means or otherwise
4. Reverse engineering or modifying the App, or distributing it to others
5. Causing trouble for other users or for us, or interfering with the operation of the App

If we determine that you have done any of the above, we may stop accepting requests from your device.

6. Rights

The rights to the App's artwork, text, design, and software belong to us or to their respective rights holders. You can view the licenses for the App's fonts and map data under “Settings” › “About Akari” › “Licenses” in the App.

7. Changes to and suspension of the App

1. We may change the content of the App or stop providing it.
2. If we stop providing the App, we will announce it in advance in the App or on this website.
3. All or part of the App may be temporarily unavailable due to maintenance, outages, network problems, or other reasons.

8. Liability

1. We do not guarantee that the App will always work correctly or that it will suit your purposes.
2. Records, keepsakes, and notes may be lost due to device failure, iCloud syncing, or other reasons.
3. If you suffer damage from using the App and we are liable for it, our liability is limited to the total amount you paid within the App during the 12 months up to the date the damage occurred, except in cases of our willful misconduct or gross negligence.
4. Apple is not responsible for maintenance or support of the App, or for any claims relating to the App.

9. Changes to these terms

We may change these terms when necessary. When we do, we will post a notice on this page in advance, stating what is changing and the date the revised terms take effect. If you use the App after that date, you are deemed to have agreed to the revised terms.

10. App Store terms and conditions

In addition to these terms, Apple's App Store terms and conditions apply to obtaining and using the App.

11. Governing law and jurisdiction

These terms are governed by and interpreted in accordance with the laws of Japan. You and we agree that the district court having jurisdiction over our domicile shall have exclusive jurisdiction as the court of first instance over any dispute relating to the App.

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