Mystiko

Terms of service

Effective November 14, 2026

These terms are an agreement between you and Sigalion Labs ("we"), for your use of the Mystiko app and the service behind it. By installing or using Mystiko, you agree to them. If you do not agree, do not use the app.

Who may use Mystiko

You must be at least 13 years old, and old enough under the law where you live to agree to these terms. You must also follow the laws that apply to you when you use the app.

Your keys are yours alone

Mystiko creates your encryption keys on your phone, and they never leave it. We do not have a copy. If you uninstall the app, reset your phone or lose it, your keys, contacts and messages are gone, and we cannot restore them. Your Mystiko ID will also change if you start again on a new install.

Subscriptions

• Reading messages is free. Sending messages requires a subscription to one of the encryption levels.
• Subscriptions are sold and billed through Google Play, monthly or yearly, at the prices shown at the time you buy.
• A subscription renews automatically at the end of each period until you cancel it. You can cancel at any time in Google Play, and you keep your level until the end of the period you have paid for.
• Refunds are handled under Google Play's refund policy.
• We may change prices or what a level includes. If a price change affects a subscription you already have, you will be told in advance and can cancel before it takes effect.

What you agree not to do

• Use Mystiko to break the law, or to threaten, harass or defraud anyone.
• Send spam or bulk unsolicited messages.
• Attack, overload or interfere with the relay, or try to reach data that is not yours.
• Copy, modify or resell the app, or try to get around the subscription, except where the law gives you that right.

We cannot read messages, so we do not review them. If a Mystiko ID is used to abuse the service, for example by flooding the relay, we may block that ID.

Security, stated plainly

Mystiko uses published, widely reviewed encryption methods, and no level of it is known to be breakable today. No system is perfectly secure, and we do not promise that Mystiko can never be defeated. Encryption protects a message in transit and on our server. It does not protect a phone that is unlocked in someone else's hands, a device with malicious software on it, or a screen that someone photographs.

The sender's choices about how long a message lasts are carried out by the app on each phone. They do not prevent a recipient from copying a message by other means.

Availability

We work to keep the service running, but it may be interrupted for maintenance, for reasons outside our control, or if we have to stop offering it. If we end the service, we will give notice on this website where we reasonably can.

The app is provided as is

To the extent the law allows, Mystiko is provided "as is" and "as available", without warranties of any kind, whether express or implied, including warranties of merchantability, fitness for a particular purpose and non-infringement.

Limit of liability

To the extent the law allows, we are not liable for indirect, incidental, special, consequential or punitive damages, or for lost data, lost profits or lost business, arising from your use of Mystiko. Our total liability for any claim about the app or the service is limited to the amount you paid us for Mystiko in the twelve months before the claim arose.

Some places do not allow some of these limits, so parts of this section may not apply to you.

Ending your use

You can stop using Mystiko at any time by uninstalling it, and you should cancel any subscription in Google Play. We may suspend or end access for anyone who breaks these terms.

Changes to these terms

We may update these terms. The new version will be posted at this address with a new effective date. Continuing to use Mystiko after a change means you accept the updated terms.

Governing law

These terms are governed by the laws of the United States and of the state in which Sigalion Labs is based, without regard to conflict-of-law rules. Any rights you have under the consumer protection laws of the place where you live are not affected.

Contact

See also the privacy policy.