Effective August 25, 2026

Privacy Policy

Deduce Daily is a free logic puzzle game. There is no account, and your progress is saved on your own device rather than on a server of ours. What we do collect is measurement of how the puzzles are played. This page explains what that is, why we collect it, who receives it, how long it is kept, and what you can do about it.

The short version

Who we are

Deduce Daily is operated by ZW Studio LLC, a limited liability company formed in the State of New Jersey, United States. We are the controller of the personal data described here under UK and EU data protection law. This policy covers the website at deducedaily.com and the iOS and Android apps published as com.deducedaily.app, which share the same puzzle code but do not handle data identically; where they differ, we say which we mean. Our Terms of Use incorporate this policy. Write to support@zwstudiollc.com with any question, request or complaint about this page; the mailbox is monitored.

What stays on your device

As you play, the game keeps a record of what you have done: which puzzles you have finished, your best times per game and difficulty, your streaks, and your settings. On the website that lives in your browser’s local storage, and in the apps in your phone’s own app preferences. We never receive it: there is no server-side copy, so we could not produce it if you asked, nor restore it if you lost it.

On a phone or tablet, a copy travels in the iCloud or Android backup you already take, sitting in your own Apple or Google account under Apple’s or Google’s terms rather than ours. It never reaches us, and turning that backup off stops it.

Clearing this site’s browsing data removes everything the website keeps; deleting an app or clearing its data does the same on a phone. In the apps, Settings → Reset all progress is narrower: it clears your per-game progress, best times and streaks, and nothing else. It does not clear your settings, the flag recording that we have already offered you the store’s review prompt, or any analytics identifier; it does not change your consent answer; and it does not reset the running count of finished puzzles behind Apple’s install measurement described below. The website has no equivalent control — clearing the site’s storage in your browser is how you reset it there.

What we measure, and why

We measure to learn which puzzles people play and finish, which ones they give up on, and how long a board takes. That is how we decide what to fix and what to build next. Nobody buys this data and we do not use it to advertise to you.

What we collect describes how the game is used — which game you opened, whether you finished it or left it unsolved, how long you spent, which screens you saw, whether you took a hint. Google’s library adds its own baseline: a first open, session starts, engagement time, and general device information — model, system and app version, language, and the approximate country it derives from your connection.

An identifier travels with all of it. Google’s library creates a random identifier for your copy of the app, or for your browser, stores it on your device and sends it with each event, so that repeat sessions can be counted as one player rather than many. In the apps Google’s software keeps a second identifier of its own, which it needs in order to run its service and which lasts for the life of the installation even if you decline measurement. Neither is your name and neither is an account — we hold neither, and we cannot turn either one back into a person. Deleting the app, or clearing the site’s storage in your browser, discards the identifier for that surface.

Two details deserve stating plainly. In the apps, when you finish or give up on a board, the time you spent is sent as an exact number of whole seconds, not only a rough band; from the website, completion time leaves your browser only as a coarse band, and giving up sends no time at all. In the apps, finishing the daily challenge also sends the date of that day’s puzzle and your current streak — the one number out of your saved progress that leaves the device. The website sends no daily event, so the streak it keeps for you never leaves your browser.

Measurement begins when the app starts, before any consent answer exists. The apps open with measurement on and advertising off, and those settings stand until the app can reach Google’s consent service and learn whether you must be asked. On a launch with no network they stand for the whole session — which, for a game built to play offline, is ordinary rather than an edge case. Your answer applies from the moment you give it and does not erase what came before, though you can ask us to delete that.

Where the law requires consent to store or read information on your device — the United Kingdom and the European Economic Area among them — consent is our legal basis for this, and we do not offer legitimate interests instead. Measurement is not necessary to play: every puzzle, hint and record works the same either way.

Your privacy choices

In the apps. Settings → Privacy choices reopens Google’s consent form, and a change takes effect at once. That control appears only where Google reports that consent is required, which today means the United Kingdom, the European Economic Area and Switzerland. Everywhere else no form is shown, you are not asked, and there is no other in-app switch that turns measurement off. What is left is your device’s own settings, deleting the app, or writing to support@zwstudiollc.com to ask us to stop, which we act on as an objection.

On the website. The “Privacy choices” control in the footer opens our privacy dialog — or Google’s own consent message instead, where Google’s certified consent platform is active on the page. There is no banner on your first visit: in the United Kingdom, the European Economic Area and Switzerland measurement is withheld until you allow it. Elsewhere it starts on, and the website also permits Google’s advertising storage from the first page load — something the iPhone and iPad app never does at all, and the Android app does only once your consent allows it — and then only to read the advertising ID described above, never to personalize an advertisement. The dialog is how you switch all of that off.

If your browser sends the Global Privacy Control signal and you have made no choice here, we treat that as an opt-out; a choice made in the dialog takes precedence from then on. We do not respond to browser “Do Not Track” signals, because no common standard for interpreting them has been established. Google Analytics and the advertising script described below are Google services that run on many websites, so Google may see your activity across them; no one else does.

Changing your answer governs what is sent from that point onward and does not delete what was already sent. We tell Google whether you consented and Google limits what it may store and which identifiers it may use accordingly, though a request may still reach it, counting only toward anonymous totals. You can also opt out of personalized advertising with Google at adssettings.google.com.

Advertising

No advertisement runs in either app or on the website today, and neither app contains ad-serving software or a single ad unit. Both apps are registered as applications with Google AdMob, under the same publisher account as the website, because that registration is what Google’s consent form is configured against — it serves no advertising. We say so because it would be inaccurate to claim we have no relationship with any advertising network.

The website is built to carry Google AdSense, and Google’s advertising script loads on every page so that Google can review the site: Google’s advertising service is contacted on each page view and receives your IP address and browser details, even though nothing is displayed. Neither the “Privacy choices” control nor Global Privacy Control stops that request — the script loads either way. What they do is tell Google to deny advertising and analytics storage, so no advertising cookie is set or read and no identifier is attached to you; Google still receives your IP address and browser details. We will update this page before any advertising begins.

The Android app declares access to your device’s advertising ID. Google’s library reads it only after your consent state has resolved, and only where advertising is permitted — where you were asked and accepted, and also where Google reports that no consent is required and so you were never asked. If you decline it is never read, and you can reset or delete the ID in Android settings at any time.

The iOS app does none of that. It never shows the App Tracking Transparency prompt and does not read your device’s advertising identifier, the IDFA. That is why you are never asked to allow tracking.

Who else receives your data, and how long it is kept

Google is the only third-party service we add to the apps: Google Analytics for Firebase, reporting into an analytics property we control, and Google’s consent platform, which presents the form and records your answer. The website additionally uses Google Analytics and the advertising script described above. Google’s own handling is governed by the Google Privacy Policy.

Two others receive data as well. Apple operates the install measurement built into iOS: the app reports a coded value reflecting how many puzzles you have finished, so we can tell in aggregate whether installs lead to play. Apple does the attribution and returns only totals; we never learn who installed the app, and it does not depend on your consent answer. The count behind that value is kept separately from your game records and survives Reset all progress; deleting the app clears it. On Android, Google’s library does the equivalent job itself, attributing an install to the store listing or campaign that produced it. We see only totals there too. Netlify hosts the website and keeps ordinary access logs of IP addresses, times and pages requested.

For the install measurement and the hosting logs we rely on our legitimate interest in knowing whether installs lead to play and in serving and protecting the site. Otherwise we disclose data only to our professional advisers, to a successor if the business is sold, and where the law requires it. We do not sell personal data. We require every third party that receives data from the apps or the website — Google, Apple and Netlify included, and any of their affiliates that handle it — to protect it at least as well as this policy describes.

Transfers. Google, Apple and Netlify process data outside the United Kingdom and the European Economic Area, including in the United States. We rely on the EU-US Data Privacy Framework and its UK Extension where the recipient is certified, and otherwise on the European Commission’s standard contractual clauses with the UK Addendum; ask and we will send you the safeguards that apply.

Retention. Analytics event and user data expires after 14 months in every Google Analytics property that receives it, though Google’s aggregated reports are not subject to that setting. Netlify keeps its access logs for its own period, which we do not control. Data on your device lasts until you clear it or delete the app. Email you send us is kept while the matter needs it and up to two years afterward.

What we never collect

We build no profiles and make no automated decisions about you.

Your rights

If the UK or EU GDPR applies to you, you may ask for access to your data and a copy of it, have it corrected or deleted, have processing restricted while a dispute is resolved, receive data you gave us in a portable form, and withdraw consent at any time — withdrawing is as easy as giving, and does not affect what was done beforehand. You also have the right to object at any time to processing we base on legitimate interests: the install measurement, the hosting logs, the store review prompt and our handling of your email. You need give no reason, and for the analytics of a free puzzle game we will simply stop.

Write to support@zwstudiollc.com to use any of these. We reply within one month, extendable by two for a complex request, and charge nothing. Because there is no account, we usually hold nothing we can connect to you as a person; where that is so we will say it plainly rather than ask for more identifying information than the request needs.

If you live in the United States, you may ask what we hold about you and ask us to delete or correct it, and you may opt out of any sale, sharing or targeted advertising. We honor Global Privacy Control on the website and will never treat you differently for making a request.

You may complain to a data protection authority at any time: in the United Kingdom the Information Commissioner’s Office, in the European Economic Area the authority for the country where you live or work, and in Switzerland the Federal Data Protection and Information Commissioner. We would rather you told us first, so we can put it right.

Children

Deduce Daily is for a general audience aged 13 and over. It is not directed to children under 13, and is not offered in Apple’s Kids Category or Google Play’s families program. We do not knowingly collect personal information from children under 13. If you believe a child has given us something, write to support@zwstudiollc.com and we will delete it.

Security

There is very little to secure, which is the strongest thing we can say about it. The website is static files served over HTTPS, neither it nor the apps accept submissions, what the apps keep they keep on your own device, and everything they transmit travels over encrypted connections. No system is perfectly secure — if you find a problem, write to support@zwstudiollc.com.

Changes, and how to reach us

We update this policy when the law, a store requirement, a feature, or a service we use changes. When we do, we change the effective date at the top of this page, note what changed below, and mention any material change in the next app update’s release notes. Changes apply going forward and are never retroactive; the current version is always the one published at deducedaily.com/privacy.

ZW Studio LLC, a limited liability company formed in the State of New Jersey, United States, operator of Deduce Daily, is the controller of the data described here. Questions, requests, objections and complaints all go to support@zwstudiollc.com.

What changed

August 25, 2026. Rewritten in plain language. No change to what we collect, who receives it, or how long it is kept.

Your call

Privacy choices

Allow anonymous measurement to help us improve puzzle completion and page speed. We never store names, email addresses, or raw play times, and this choice does not enable advertising cookies.