Privacy Policy — Calculus AI
App: Calculus AI - Smart Solver (com.aicalculus.calculusai)
Platforms: iOS and Android
Last updated: 26 September 2026 · Effective date: 26 September 2026
Short version: no account, no ads, no tracking, no location. Your saved work stays on your device. The only thing that leaves your device is the question or photo you choose to submit, which is sent to Google's Gemini AI to generate your solution.
At a glance
Question
Answer
Do I need an account?
No. There is no sign-up, no login and no password.
Do you collect my name, email or phone number?
No.
What does leave my device?
The calculus question you submit — typed text and/or the photo you choose — plus a security token.
Where does it go?
To Google's Gemini AI models, through Firebase AI Logic (Google), to generate your solution.
Do you train AI models on my content?
No.
Do you show ads or track me across other apps?
No ads, no advertising identifier, no cross-app tracking.
Do you collect my location?
No. The App never requests location permission.
Where is my saved work stored?
On your device only. Your history, flashcards, quizzes, cheat sheets and tutor chats are never uploaded to us.
Can I delete my data?
Yes, at any time. Delete individual items in the App, or delete the App to remove everything.
Do you sell my data?
No. We never have and never will.
1. Who we are
Calculus AI ("the App") is developed and published by an independent developer ("we", "us", "our"), who acts as the data controller for the purposes described in this policy.
Contact: eddietwchan@gmail.com
This policy explains what happens to your information when you use the App. It applies to the iOS and Android versions of Calculus AI.
2. Our approach in one paragraph
Calculus AI is built as a local-first app. There is no user account and no server of ours that stores your data. Your questions, solutions, flashcards, quizzes, cheat sheets and tutor conversations live in the App's private storage on your own device. The only time your content leaves your device is when you ask the App to solve something: at that moment, the question and/or photo you submitted are sent to Google's Gemini AI service so that a solution can be generated and returned to you. We never receive a copy of it ourselves, and we do not keep it on any server we control.
3. What we do not collect
We want to be explicit, because most apps do collect these things:
No account data. We do not ask for or store your name, email address, phone number, date of birth, postal address or password. There is no registration of any kind.
No location data. The App contains no location functionality and never requests location permission. No GPS, network or approximate location is collected.
No advertising data. There are no advertising SDKs in the App, no advertising identifier (IDFA / GAID), no ad targeting and no cross-app or cross-site tracking.
No analytics profiles. The App contains no third-party analytics SDK and no crash-reporting SDK. We do not build behavioural profiles or infer anything about you.
No contacts, calendar, microphone, health or biometric data. The App does not request access to any of these.
No background collection. The App does not run in the background and does not collect anything while you are not using it.
4. What is processed when you use an AI feature
4.1 The content you submit
When you ask the App to solve or explain something, you may provide:
Text — a typed question, an equation, a topic you want a quiz or flashcard set about, or a message in the AI Tutor chat.
An image — a photograph you take with the camera, an image you select from your photo library, or a crop of one.
Your App language — so the solution comes back in the language you are using.
4.2 Where it goes
That content is transmitted over an encrypted HTTPS connection to Google's Gemini models via Firebase AI Logic (a Google service), operating on Google Cloud infrastructure. Google is an independent third party; it is not our agent and it processes the content under its own terms.
In plain terms: your maths question and your photo are sent to Google's AI to be solved. That is what makes the App work. It is the only reason any of your content ever leaves your device.
We do not operate this service ourselves and we do not receive, store or have access to a copy of your submitted content. Our own infrastructure stores none of it.
4.3 What Google does with it
According to Google's terms for the enterprise service this App uses (the Agent Platform Gemini API, formerly Vertex AI):
Your content is used to generate the response you requested.
It is not used to train or improve Google's foundation AI models.
Google may retain it for a limited period for security, abuse-prevention and service-monitoring purposes.
You can read Google's own commitments in the Google Privacy Policy and the Firebase AI Logic documentation.
4.4 What we never do with it
We do not:
use your questions, photos or solved problems to train any AI model;
read, review, moderate or manually inspect your submissions;
use them for advertising, marketing, profiling or creditworthiness;
sell, rent or trade them to anyone; or
share them with any third party other than the AI service described above (and the platform providers in §10, which do not receive your content).
4.5 Your consent
The first time you use an AI feature, the App shows you a clear notice naming Google Gemini as the AI provider and describing exactly what is sent, and asks for your explicit permission before anything is transmitted. Consent is stored on your device. You can withdraw it at any time in Settings → AI Data Sharing, and the App will then stop sending your content to the AI service (AI features will be unavailable, but your saved library remains accessible). You can also simply decline — the App will not crash or misbehave, and no content is sent.
5. Camera and photo library
Camera — used only when you choose to photograph a problem. The camera preview and capture happen on your device. Nothing is recorded or transmitted until you submit the problem for solving.
Photo library — used only for the single image you pick. The App does not scan, index or upload your photo library. On iOS, the App does not request full library access.
A copy of the photo you submit is saved inside the App's own private storage on your device so your history entry keeps its image (see §8). It is not uploaded anywhere by us.
You can revoke camera and photo permissions at any time in your device settings. The App will simply stop being able to take or import new photos.
6. Subscriptions and payments
Calculus AI Pro is an auto-renewable subscription sold through the Apple App Store (and, on Android, Google Play).
We never see or handle your payment details. Your card number, billing address and Apple ID billing information are processed entirely by Apple. We receive no payment card data whatsoever.
What we receive is whether your subscription is active. This is verified on your device.
We use Superwall to manage and display subscription offers. Superwall receives subscription and app-lifecycle events (for example "paywall shown", "purchase completed") under an anonymous identifier. We do not pass your name, email address, or any other identifier to Superwall, and no personal profile is built about you. See the Superwall privacy policy.
Payment and purchase records are retained by Apple and Google under their own policies. Apple's Privacy Policy applies to those transactions.
Subscriptions are governed by Apple's Standard End User License Agreement and the purchase terms shown on the paywall.
7. Technical data generated for security and configuration
These are not used to identify or profile you:
App Check (Google). Before serving an AI request, the App obtains a device attestation token (Apple App Attest on iOS, Play Integrity on Android). This proves the request came from a genuine copy of the App and protects the AI service from abuse. The token is a cryptographic attestation, not a personal identifier, and it is never linked to your activity.
Remote configuration (Google). The App periodically fetches lightweight configuration values (for example, feature flags and AI model settings) from Firebase Remote Config. This request is not linked to your identity or to the content you submit.
Platform and network logs. As with any internet service, the network providers involved (Google, and your mobile operator or ISP) may process technical information such as your IP address and request timestamps in order to route traffic and prevent abuse. We do not use this to identify you.
8. What is stored on your device
The App keeps the following in its private storage area on your device. None of it is uploaded to us:
What
Details
Solution history
The question text, the solution, the working steps, the explanation, the date, the processing time, and a copy of the submitted photo.
Saved photos
A copy of each photo you submit, kept in the App's private storage so your history entry displays correctly.
Flashcards
AI-generated cards you have created, plus their mastery state.
Quizzes
Generated questions, your answers and scores.
Cheat sheets
AI-generated formula references you have saved.
AI Tutor chats
The full message history of your tutor conversations.
Preferences
Your chosen theme, language, consent choice, and internal counters (for example, how many free solutions you have used and whether the App has already offered you a rating prompt).
Subscription status
Whether your Calculus AI Pro subscription is currently active.
You are in control of all of it:
Delete individual history entries inside the App.
Clear your saved history from within the App.
Deleting the App deletes everything — the database, all saved photos and all preferences are removed with it.
Because this data never reaches us, we cannot see it, recover it, or hand you a copy of it — and nobody else can either.
Device backups. If you have iCloud Backup or computer backups enabled for your device, your device backup may include this App's private data, as Apple provides. Those backups are encrypted and managed by Apple under Apple's terms; they are not accessible to us. You can exclude or delete backups through your device settings.
9. Sharing and exporting
PDF export and the share sheet are entirely user-initiated. When you export a solution to PDF or share it, the resulting file is created in a temporary folder on your device and handed to the destination you pick (for example, Mail, Messages or Files). We are not involved and nothing is transmitted to us.
Ratings and reviews. When the App offers you an in-app rating prompt, that is Apple's own mechanism and happens entirely between you and Apple. Any review you post is public and governed by Apple's terms.
10. Third parties
We do not sell, rent or trade your personal information. We share it only as described below:
Recipient
What it receives
Why
Google (Firebase AI Logic / Gemini)
The question text and/or photo you submit, and your App language
To generate your solution
Google (Firebase App Check)
A device attestation token
To prevent abuse of the AI service
Google (Firebase Remote Config)
A configuration request (IP address, as inherent to any web request)
To deliver app settings
Superwall
Anonymous subscription and app-lifecycle events
To present and validate subscription offers
Apple
Your purchase and subscription transaction
To process payment and validate entitlement
Your device platform
Standard network metadata
To route the requests described above
We have no other third parties: no advertising networks, no data brokers, no analytics providers, no crash-reporting services, no social media SDKs, no AI providers other than Google.
We may also disclose information if we are legally required to do so — but note that we hold essentially no information about you to disclose. If we are ever compelled to hand over data, we will notify affected users unless legally prohibited.
11. Retention
Data
How long it is kept
Saved solutions, photos, flashcards, quizzes, cheat sheets, tutor chats
On your device, until you delete it. We keep nothing.
Preferences, consent choice, subscription status
On your device, until you delete the App or clear the data.
Content sent to the AI service
Not retained by us. Retained briefly by Google for security and abuse-prevention purposes under Google's terms.
Purchase and subscription records
Retained by Apple (and Google) under their policies.
Security / configuration requests
Transient; standard provider log retention applies.
12. Security
All traffic between the App and Google's services uses encrypted HTTPS/TLS.
The App uses device attestation (App Attest / Play Integrity) so that only genuine copies of the App can call the AI backend.
Your saved data is held in the App's sandboxed private storage, protected by your device's own encryption and passcode.
We keep no copy of your content on any server.
Because we hold no user database, there is no central store of yours to be breached. However, no method of transmission or storage is completely secure, and we cannot guarantee absolute security.
13. International transfers
The App's AI processing is performed by Google on Google Cloud infrastructure, which may involve processing your content on servers located outside your country — including in the United States and other regions where Google operates. For users in the European Economic Area, the United Kingdom or Switzerland, these transfers are covered by Google's contractual safeguards (including the European Commission's Standard Contractual Clauses and, where applicable, the EU–US Data Privacy Framework) under Google's role as the service provider.
14. Your privacy rights
14.1 Everyone
Delete everything by deleting your saved items in the App or deleting the App.
Withdraw AI consent at any time in Settings → AI Data Sharing.
Stop all transmission of your content by withholding or withdrawing consent.
Contact us with any privacy question or complaint.
Because we hold no account and no server-side copy of your data, there is nothing for us to retrieve, correct, port or erase on our side — the controls are in your hands and in the App.
14.2 If you are in the EEA, the UK or Switzerland (GDPR / UK GDPR)
You have the right to access, rectify, erase, restrict or object to processing, and the right to data portability and to lodge a complaint with your local supervisory authority.
Legal basis: we rely on your consent (Article 6(1)(a)) for transmitting your question or photo to the AI provider — this is why the App asks for your explicit permission first. We rely on legitimate interests (Article 6(1)(f)) for the security measures in §7 (preventing abuse of the service).
Automated decision-making: we do not use your data for automated decision-making or profiling that produces legal or similarly significant effects. AI is used solely to produce a maths solution for you to read.
14.3 If you are in California (CCPA / CPRA)
We do not sell your personal information and we do not share it for cross-context behavioural advertising, as those terms are defined by the CPRA.
We do not collect categories of sensitive personal information beyond the content you voluntarily submit.
You have the right to know, delete and correct. Because we hold no records about you, we cannot identify you in our systems — your deletion and access controls are in the App itself.
We do not discriminate against you for exercising your rights.
14.4 If you are elsewhere
If your jurisdiction grants you rights over your personal data, contact us at the address in §18 and we will help within the limits of what we hold — which, as explained, is nothing beyond what is on your own device.
15. Children's privacy
Calculus AI is an educational study aid intended for secondary-school and university students. It is not directed to children under 13, and we do not knowingly collect personal information from children under 13.
The App requires no account and collects no personal identifiers, which minimises any risk to younger users.
The App contains no advertising.
Like any AI tool, it can produce incorrect output, and younger students should use it with adult guidance.
Parents and guardians: if you are concerned about a child's use of the App, you can delete all saved data at any time from within the App, or by uninstalling it. If you believe a child has submitted personal information to the AI service, contact us and we will advise you.
Note that the App's App Store age rating reflects its content, not a statement that it is directed at children.
16. About AI-generated content
The App's solutions, explanations, flashcards, quizzes and cheat sheets are generated by an AI model. They may be incomplete, inaccurate or wrong. Always check AI-generated mathematics against your textbook or teacher before relying on it — especially for graded work. The App is a study aid, not a substitute for instruction.
This section is about accuracy rather than privacy, but we think you should see it here too. The full terms governing your use of the App are Apple's Standard End User License Agreement.
17. Changes to this policy
If we change how the App handles your information, we will update this policy and revise the "Last updated" date above. Material changes — for example, a new AI provider or a new category of data — will be highlighted in the App before they take effect, so that you can review them and decide whether to continue. We will not apply a materially different use to information you have already submitted without asking you first.
18. Contact
Questions, requests or complaints about privacy:
Email: eddietwchan@gmail.com
We aim to respond within 7 days. If you are not satisfied with our response and you are in the EEA or the UK, you have the right to complain to your national data protection authority.
Appendix A — App Store "App Privacy" summary
This is the same information in the form Apple's App Store Connect questionnaire expects, so that the two stay consistent.
Apple's category
Our answer
Data used to track you
None.
Data linked to you
None. We create no account and hold no profile.
Data not linked to you
User Content (the questions and photos you submit) — collected for the purpose of App Functionality, and shared with a third party (Google) solely to generate your solution. Marked as not used for tracking.
Purchases
Purchase and subscription status are processed by Apple; we do not collect payment information.
Location
Not collected.
Identifiers
None that identify you. App Check attestation tokens are not personal identifiers.
Usage / Diagnostics / Advertising data
Not collected. The App contains no analytics or crash-reporting SDK.
Appendix B — Permissions the App requests
Platform
Permission
When it is requested
What it is for
iOS
Camera
When you tap to photograph a problem
Taking a photo of the problem
iOS
Photo Library
When you tap to select an image
Choosing an image to solve
Android
Camera
When you tap to photograph a problem
Taking a photo of the problem
Android
Read storage / photos
When you tap to select an image
Choosing an image to solve
Android
Internet
On first AI request
Sending your question to the AI service
The App requests no location, contacts, calendar, microphone, health, Bluetooth or notification permission.
This policy is governed by the laws of the Hong Kong Special Administrative Region of the People's Republic of China, without prejudice to any mandatory consumer protection rights you have in your country of residence.
Calculus AI — Privacy Policy · Last updated 26 September 2026