Terms of use

Version of 27 August 2026

This is a translation. The binding version is the Russian one, at tessera-app.ru/legal/terms.

1. What this document is

An agreement between you and individual entrepreneur Maksim Sergeyevich Kuznetsov (TIN 773391216156, state registration number 326508100402717) — “we” below — about the use of the Tessera mobile app and the website tessera-app.ru.

By installing and using the app you accept these terms. If you do not agree, do not use it; deleting the app ends the agreement on your side.

Section 4, together with the page tessera-app.ru/pay, is a public offer: by paying for the full version you enter into a contract with us on the terms set out there.

2. What Tessera is

An app for keeping a personal diary: ratings of your own state, habit marks, sleep times, time by category, notes, photos and voice notes. From those entries the app builds weekly, monthly and yearly reports.

We grant you the right to use the app for its purpose, on any number of your devices, without a time limit. The rights to the app itself, its source code, design, texts and icons remain ours.

3. What you may and may not do

You may: keep a diary, export a copy of it, move that copy to another device, and use the app for as long as you like.

You may not:

• reverse-engineer, decompile or modify the app, except where the law expressly allows it;
• resell access, pass the full-version key to third parties for money, or bypass the purchase check;
• deliberately overload or break our server, or use the cloud storage for anything other than a copy of your own diary.

For a breach we may refuse access to the server-side features. The diary on your device remains yours and keeps working.

4. The full version

What it is. A set of additional features: report insights, a cloud copy of the diary, voice notes and photos in a day entry, unlimited habits, your own time categories, a lock on the app, appearance sets, the year and month cards. The exact composition is listed on the payment page and may grow.

Price and payment. The price is shown on the payment page in roubles and is confirmed before the charge. The purchase is one-time: there is no subscription, no automatic renewal and no repeated charges. Payment goes through the secure YooKassa page, by bank card or via SBP. Card details are entered on the bank’s side and never reach us.

The fiscal receipt. At payment an email address is asked for — it is needed for the receipt under Russian Federal Law 54-FZ. YooKassa sends the receipt to that address.

When the service counts as rendered. No delivery is required: this is a digital service inside the app. The full version unlocks on the device you started the purchase from right after a successful payment, usually within seconds. From that moment the service counts as rendered.

The key. A key is issued along with the access. It is only needed to move the full version to another device; the key is visible in the app’s settings. It is meant for you personally.

Term. The access is perpetual. It is not withdrawn over time and needs no renewal. If the app stops being developed, a full version already bought will keep working on your devices.

Refunds. Since the service is rendered the moment the access opens, the payment is as a general rule not refunded. We will refund the money if:

• the charge went through twice or by mistake;
• the access never opened and we could not open it;
• you contacted us before the full version unlocked in the app.

Write to support@tessera-app.ru. We refund by the same method you paid with; on the bank’s side this usually takes up to ten business days.

5. Your entries belong to you

Everything you have written is yours. We make no claim to the content of the diary, use it for nothing and, with one exception, have no access to it: the diary is stored on your device.

The exception is the cloud copy, if you switched it on. It is encrypted on your phone before sending, and we cannot read it: we do not have the key. Details are in the privacy policy.

Keeping your entries safe is on you: make copies. The app can do both a file and the cloud — but the decision to make a copy stays yours.

6. The app does not replace a doctor

Tessera is a diary, not a medical device. It makes no diagnosis, prescribes no treatment and is not a means of preventing or treating any condition.

Reports and insights show links between your own entries — that is an observation, not a conclusion. Do not make decisions about your health on their basis. If you feel unwell, see a specialist.

7. Liability and availability

We do our best to keep the app working, but cannot promise that it will always work without errors or interruptions. The server side may be unavailable because of maintenance or a failure at the hosting provider; the diary keeps working meanwhile — it does not depend on the network.

We are not liable for a loss of entries caused by damage to or loss of your device, by deleting the app, or by losing the recovery code of the cloud copy.

Nothing in this section limits your rights as a consumer under the law.

8. Changes to the terms

We may change these terms. A new version is published on this page with the date. If something substantial changes, we will say so in the app.

The terms of a purchase already made are not revisited: the version in force on the day of payment applies to it.

9. Law and disputes

The law of the Russian Federation applies.

If something went wrong, write to us first: most questions are settled by correspondence within a day. We answer a claim within thirty days.

If an agreement cannot be reached, the dispute is settled in court. As a consumer you are entitled to apply to a court at your place of residence or stay — that right is given to you by law and we do not limit it.

10. Details

Individual entrepreneur Maksim Sergeyevich Kuznetsov
TIN 773391216156
OGRNIP 326508100402717
support@tessera-app.ru