Policy

Privacy policy

What SNN Systems, Calm Puzzles and Pencilwork collect, who processes it, and how to have it deleted.

Last updated 12 October 2026

1. Who is responsible

SNN Systems, the software studio operated by Shahriar Nasim Nafi in Bangladesh, decides how the data described here is handled. Contact: contact@snnsystems.com.

This policy covers this website, email to the studio, products bought directly from the studio, and the studio's apps for iPhone, iPad and Android: Calm Puzzles and Pencilwork.

2. This website collects nothing

This site sets no cookies, runs no analytics, and loads nothing from a third party. There is no tracking pixel, no advertising tag, no embedded widget, no session storage and no consent banner, because there is nothing to consent to. Every page is a static file. All fonts are the ones already installed on your device, so no font is fetched from an outside server. No JavaScript runs on any page of this site.

You can check this yourself: open your browser's network panel and reload. Every request goes to this domain, and no cookie is written.

One caveat. The site is delivered by a hosting provider, and like any web host it processes the technical details every request carries, such as your IP address, the page requested, your browser's user-agent string and the time, so that it can serve the page and block attacks. That processing is the host's own, under its own terms. The studio does not add analytics on top of it and does not receive a per-visitor record from it.

3. Email

If you email the studio, the message, your email address and anything you attach are held so that the conversation can be answered and referred back to later, for example to check the history of a support case or a refund. Support and sales correspondence is kept for up to 3 years from the last message, then deleted. Email relating to an order is kept as long as the transaction records described below.

4. Products bought directly from the studio

This section applies to software bought from the studio itself, with Paddle handling the checkout. No product is sold this way at the moment. It does not apply to purchases made inside Calm Puzzles or Pencilwork, which go through Apple or Google and are covered in sections 5 and 6.

Paddle.com Market Ltd acts as merchant of record and processes all payments for direct purchases. Paddle collects and handles your payment details directly. Card numbers and bank details are never sent to, seen by, or stored by the studio, and the studio has no ability to charge your card itself. Paddle also calculates and remits sales tax and VAT, and issues your invoice. Paddle's handling of your data is governed by its own privacy notice as an independent controller for those purposes.

From Paddle, the studio receives and stores the order record:

your name and the email address used at checkout;
your country, and the tax treatment applied;
the product bought, the amount, the currency and the transaction reference;
the licence keys issued for the order and where they are activated.

This is used to issue and support your licence, to answer questions about the order, to process refunds and to keep the accounting records the law requires.

5. Calm Puzzles

Calm Puzzles is a puzzle game for iPhone, iPad and Android, published by the studio on the App Store and Google Play. This section is the app's privacy policy. There is no account, the app asks nobody for a name, email address or phone number, and it shows no ads and does no tracking.

What stays on your device

The app saves your puzzles in progress, your settings (such as Large text and High contrast), your stats and your daily streak in its own storage on your device. None of this is sent to the studio. If you back up your device (iCloud or a computer backup on iPhone and iPad, Google backup on Android), the backup can include it, so it can come back when you reinstall the app or set up a new device from that backup. That backup belongs to your Apple or Google account, and the studio never sees it. Deleting the app deletes this data from the device.

Purchases

Premium is an optional upgrade, sold as a yearly subscription or a one-time lifetime purchase. Payment is handled entirely by Apple (App Store) or Google (Google Play), under their own terms and privacy policies. The studio never sees your card details, name or address. Paddle is not involved in app purchases.

RevenueCat

The app uses RevenueCat, Inc. to check whether you have Premium and to confirm and restore purchases. The app contacts RevenueCat each time it starts, even if you have never bought anything, and again when you buy or restore. RevenueCat receives:

a random, anonymous app user ID created on your device, which is not linked to your name or email address;
your purchase history for this app: which product, when, and whether it is active;
the device and app details needed to check a receipt: device model, operating system version, app version, the country or region of your store, and your IP address.

This is used to make Premium work. RevenueCat also uses the purchase records to give the studio overall purchase reports, such as how many people bought each plan. It is not used for advertising or tracking, and it is not sold. RevenueCat's privacy policy is at revenuecat.com/privacy. Apple's is at apple.com/legal/privacy and Google's is at policies.google.com/privacy.

What the app does not do

It contains no analytics or crash-reporting tools.
It does not track you across other apps or websites.
It does not sell your information or share it for advertising.

Deleting your data

To delete everything the app has saved, delete the app. A device backup made earlier can still hold a copy until that backup is deleted.

To have the purchase records tied to your anonymous ID deleted from RevenueCat, email the studio as described in section 12 and include your order number: the order ID from Apple's receipt email, or the Google Play order number, which starts with GPA. The app has no account, so the order number is the only way to find your records. The studio has RevenueCat delete them and tells you when it is done.

Cancelling a subscription

Deleting the app does not cancel a subscription. The refund policy explains how to cancel.

6. Pencilwork

Pencilwork is a logic puzzle game for iPhone, iPad and Android, distributed by the studio through the App Store and Google Play. This section is the app's privacy policy. There is no account, the app asks nobody for a name, email address or phone number, and it shows no ads and does no tracking.

What stays on your device

The app saves your puzzles in progress, your settings (such as the theme, Large text and the timer), your stats, your daily records and your day streak in its own storage on your device. None of this is sent to the studio. If you back up your device (iCloud or a computer backup on iPhone and iPad, Google backup on Android), the backup can include it, so it can come back when you reinstall the app or set up a new device from that backup. That backup belongs to your Apple or Google account, and the studio never sees it. Deleting the app deletes this data from the device.

Purchases

Premium is an optional upgrade, sold only as a one-time lifetime purchase. It is paid once and never renews. Payment is handled entirely by Apple (App Store) or Google (Google Play), under their own terms and privacy policies. The studio never sees your card details, name or address. Paddle is not involved in app purchases.

RevenueCat

a random, anonymous app user ID created on your device, which is not linked to your name or email address;
your purchase history for this app: which product, when, and whether it is active;
the device and app details needed to check a receipt: device model, operating system version, app version, the country or region of your store, and your IP address.

This is used to make Premium work. RevenueCat also uses the purchase records to give the studio overall purchase reports, such as how many people bought Premium. It is not used for advertising or tracking, and it is not sold. RevenueCat's privacy policy is at revenuecat.com/privacy. Apple's is at apple.com/legal/privacy and Google's is at policies.google.com/privacy.

What the app does not do

It contains no analytics or crash-reporting tools.
It does not track you across other apps or websites.
It does not sell your information or share it for advertising.

Deleting your data

To delete everything the app has saved, delete the app. A device backup made earlier can still hold a copy until that backup is deleted.

To have the purchase records tied to your anonymous ID deleted from RevenueCat, email the studio as described in section 12, say that the request is about Pencilwork, and include your order number: the order ID from Apple's receipt email, or the Google Play order number, which starts with GPA. The app has no account, so the order number is the only way to find your records. The studio has RevenueCat delete them and tells you when it is done.

7. Why this is lawful

Where data-protection law of the kind found in the UK and EU applies, the studio relies on: performance of a contract for order records, licensing, support, and confirming and restoring Premium in Calm Puzzles and Pencilwork; legal obligation for tax and accounting records; and legitimate interests for answering correspondence, for keeping the site secure, for the Premium check each app makes each time it starts, and for overall purchase reports. No processing here relies on consent, and none of it involves automated decision-making or profiling.

8. Who else sees your data

The studio does not sell your data, does not rent it, and does not share it for anyone's marketing. It is disclosed only to: Paddle, for payment and tax on direct purchases; RevenueCat, to check and restore Premium in Calm Puzzles and Pencilwork; the email provider that carries the studio's mail; the studio's hosting provider; and any authority where disclosure is legally required.

Apple and Google handle payment for purchases made in Calm Puzzles and Pencilwork. You give your payment details to them, not to the studio, and they process them as independent controllers under their own privacy policies.

9. International transfers

The studio operates from Bangladesh, and its suppliers operate internationally, so data covered by this policy may be processed outside your own country, including outside the UK and the European Economic Area. RevenueCat, for example, is based in the United States. Where the law requires a safeguard for such a transfer, the studio relies on the mechanisms offered by the supplier concerned, such as the standard contractual clauses in its suppliers' data processing terms.

10. How long things are kept

Order and invoice records for direct purchases: 7 years, to satisfy tax and accounting requirements.
Licence and activation records: for the life of the licence, then 12 months.
Support and sales email: up to 3 years from the last message.
Calm Puzzles and Pencilwork data on your device: the studio holds none of it. It stays on your device, and in any backup you make, until you delete it.
Calm Puzzles and Pencilwork purchase records at RevenueCat: kept while they are needed to make Premium work and to restore it, or until you ask for them to be deleted.

11. Your rights

Subject to the law that applies to you, you can ask for a copy of the data held about you, ask for it to be corrected, ask for it to be deleted, ask for processing to be restricted, object to processing based on legitimate interests, or ask for your data in a portable format.

12. How to request deletion

Email contact@snnsystems.com with Data request in the subject line, saying what you want done. Include the email address the studio holds for you, and the Paddle order reference if your request concerns a direct purchase. This is how the request is matched to a record, and a request that cannot be matched cannot be actioned.

For Calm Puzzles and Pencilwork, the studio holds no email address for you, so say which app the request is about and include the App Store order ID or the Google Play order number instead. If you never bought Premium, the only records are tied to a random ID on your device that the studio cannot connect to you. Deleting the app removes that ID from the device.

Requests are acknowledged within 7 days.
They are completed within 30 days. If a request is complex you will be told before that deadline and given a date.
There is no charge.

One limit worth stating plainly: invoice and transaction records cannot be deleted on request while the law still requires them to be kept. Everything not caught by that requirement is deleted. Deleting payment data held by Paddle is a request you make to Paddle, and deleting payment data held by Apple or Google is a request you make to them. The studio will point you to the right place if you ask.

If you think a request has been handled badly, raise it through the complaints process. You may also complain to the data-protection authority in your country.

13. Children

This website and the studio's direct sales are not directed at children, and the studio does not knowingly collect data from anyone under 16. Calm Puzzles and Pencilwork are rated for everyone but are not directed at children under 13, and they ask nobody for personal information. If you believe a child has sent the studio personal data, email and it will be deleted.

14. Changes

If this policy changes, the "last updated" date at the top of the page changes with it. A change that materially affects how your data is handled will be announced by email to customers on record. Calm Puzzles and Pencilwork have no account and no email address on record, so for the apps the only notice is the date at the top of this page, which each app links to.

Questions about this policy

Email contact@snnsystems.com. It is read by Shahriar Nasim Nafi directly. Other ways to reach him are on the contact page.