Terms of service

Last updated October 8, 2026

Astralink Nexus is a chat, voice, email and broadcast service that games, apps and websites add to what they make. It is built and run by Koritsuki, a game studio. By creating an account or using Astralink Nexus you agree to these terms. If you are under 18, a parent or guardian must agree for you; see Children and parents.

1. Who we are and what the service is

"Astralink Nexus", "we" and "us" mean Koritsuki, the studio that operates this service. The service lets a developer add text chat, voice, email, direct messages and broadcast to their own game, app or website (a "title"), and lets the people who play those titles ("users") use one Astralink account across them. Parents of users under 18 get a linked parent account.

Users never pay to use Astralink. Developers pay per title, and parents may buy a paid plan for the full parent dashboard (see Payments and subscriptions).

2. Accounts

Give us true information, keep your password private, and tell us if you think someone else has your account. You are responsible for what happens on your account.
One person, one account. Do not create accounts to get around a ban or a limit.
Website accounts (developers and parents) sign in with an email address, and we may ask you to confirm it. User accounts use a username, and each user gets an address ending in @astralink.nexus.
The youngest age we allow to register is 5.

3. Children and parents

A user under 18 needs a parent or guardian. When a young user signs up, we email a confirmation code to the parent's address, and the account is created only when the parent has shared that code. A free parent account is created for the parent, with safety alerts by email.

By confirming, the parent or guardian says they are the child's parent or guardian, allows the child to use Astralink, and agrees to these terms and to our privacy policy for children on the child's behalf. A parent can change the child's controls, and can ask us to close the child's account and delete their data at any time (see Contact).

If you are a parent and the address in a sign-up is yours but the child is not yours, tell us and we will remove the account.

4. Rules for everyone

Do not use Astralink to:

bully, threaten, harass or scare anyone, or share hateful or sexual content;
ask for or share personal details of a child (such as a home address, phone number, school or location) or try to move a child to another app in secret;
scam, trick or steal from anyone, or spread malware or links meant to harm;
pretend to be someone else, or share another person's private information;
send spam, or send email that is bulk, deceptive or unwanted;
break the law, or break someone's rights (for example by broadcasting music or content you have no right to);
attack, probe, overload or reverse-engineer the service, or get around its limits and protections.

Users who break these rules can be muted, removed from a title or banned, by the developer of that title or by us.

5. Developers

If you add Astralink to a title, you also agree to the following.

Keys. Your public and secret keys are yours alone. Keep the secret key out of client code and out of public places. You are responsible for anything done with your keys. If a key leaks, replace it.
Your users. You are responsible for your title, for the users you let in, for the names and ids you assign them, and for using our moderation tools to deal with problems in your title. Users of your title are also covered by these terms.
Children. If your title is played by children, you must not try to avoid our age and parent steps, and you must not collect from them, through Astralink, anything we have not made available to you.
What you may see. A title only sees its own users' ids, names and messages in that title. You may use that information only to run and protect your title, and you must not sell it or use it to target advertising at users.
Your origins and limits. Use the allowed-websites setting honestly. We may set limits on projects, message size and rates, and may change them.

6. Payments and subscriptions

Who processes payments. Payments are handled by Stripe. We never see or store your full card number. By paying, you also accept Stripe's terms for payments.
Developers. A title costs $1 (US dollars), paid once. There is no monthly fee and no per-message charge. One payment covers one title: a game, app or website.
Parents. The free parent account costs nothing. The full parent dashboard is a paid plan: $5 a month, $36 for one year, or $48 for two years. Monthly plans renew every month. One-year and two-year plans are paid in advance for the whole period and renew at the end of it unless you cancel first.
Cancelling. You can cancel at any time from the Billing page. You keep the paid features until the end of the period you have paid for, and then the account returns to the free plan. Safety alerts stay free.
Changing plan. You can switch between plans from the Billing page. The price difference is worked out by Stripe for the time left.
Refunds. Payments are not refunded after the period has started, except where the law says otherwise or where we decide to as a goodwill gesture. If you were charged by mistake, tell us and we will fix it.
Prices and tax. Prices are in US dollars and may change for future periods; we will tell you before a change reaches you. Tax is added where it applies.
Failed payments. If a charge fails, Stripe tries again for a short time. If it still fails, the paid features end.

7. Your content

What you write, say or send through Astralink stays yours. You give us permission to store, process and deliver it, and to show it to the people you send it to, as needed to run the service. You are responsible for it and promise you have the right to share it.

8. Safety and moderation

Because children use Astralink, we may use automated systems and, where needed, people, to look at messages and activity to find threats, abuse and other harm. We may warn the parents of a child involved, tell the developer of a title, remove content, or limit or close an account. We may also share information with the authorities when we think a child or another person is in danger, or when the law requires it. How we handle information is explained in the privacy policy.

9. Ending an account

You can stop using Astralink at any time and ask us to close your account. We may suspend or close an account that breaks these terms, puts others at risk, or is used to hurt the service. When an account is closed, its paid features end and we handle its data as described in the privacy policy.

10. Availability and early access

Astralink Nexus is in early access. Features may change, be limited or be removed, and the service may be down for a while. We work to keep it running but do not promise it will always be available or free of errors.

11. Liability

The service is provided "as is". We are not responsible for what users or developers say or do, or for third-party titles. As far as the law allows, we are not liable for indirect or lost profits, and our total liability to you for anything related to the service is limited to what you paid us in the 12 months before the problem. Nothing in these terms limits anything that cannot be limited by law, including liability for death or personal injury caused by negligence, or for fraud.

12. Changes and contact

We may update these terms. When we make an important change, we will tell account holders by email or on the site before it applies, and the date at the top of this page will change. If you keep using Astralink after a change, you accept it.

Questions, a safety problem, a parent's request, or a request to close an account or delete data: write to [email protected].