App Privacy Policy

DCZT built Chart AI for the Google Play Store and App Store. This SERVICE is provided by DCZT at no cost and is intended for use as is as a commercial service.

This page is used to inform visitors regarding my policies with the collection, use, and disclosure of Personal Information if anyone decides to use my Service.

If you choose to use my Service, then you agree to the collection and use of information in relation to this policy. The Personal Information that I collect is used for providing and improving the Service. I will not use or share your information with anyone except as described in this Privacy Policy.

The terms used in this Privacy Policy have the same meanings as in our Terms and Conditions, which is accessible at my Google Play apps or App Store apps unless otherwise defined in this Privacy Policy.

Information Collection and Use

Chart AI does not ask you to create an account, and I do not run servers that store your personal data. What you create in the app stays on your device (see "Data stored on your device" below), apart from what you choose to send for AI processing (see "AI processing" below).

The app uses the third-party services listed below. Each one receives only what it needs for the purpose shown next to it, and each has its own privacy policy, linked here, which describes exactly what it collects and how you can exercise your rights with it:

• Google Play Services - App platform
• Apple App Store - App platform
• Firebase Analytics (Google) - Analytics
• Cloudflare - Relays AI requests
• OpenAI - AI processing

Chart AI shows no ads and contains no advertising SDK.

Analytics

I use Firebase Analytics (Google) to understand how the app is used and to find errors, so that I can improve it. This collects a device identifier, your device model, operating system and language, your country (derived from your IP address), how long you use the app and which features you use, whether you have made an in-app purchase, and error reports if something goes wrong. I do not use this information to show you ads, and I do not sell it.

On iOS the app shows Apple's App Tracking Transparency prompt. If you allow tracking, Firebase Analytics can read your device's advertising identifier (IDFA); on Android it can read the Google Advertising ID. Chart AI uses it for analytics only, never to show ads, and you can turn tracking off or reset the identifier at any time in your device settings.

Purchases

In-app purchases and subscriptions are processed by Apple (App Store) or Google (Google Play). I never see or store your payment details; the app only keeps a record on your device of which purchases are active, so that it can unlock what you paid for.

Data stored on your device

Everything you save in the app - your analysis history (your last 50 analyses, with the chart images you analysed), your trading preferences, your onboarding answers, language and settings - is stored only on your device and is not uploaded to me. If you choose to share something from the app, it is handed to the app you pick through your device's share function and leaves your device only then. Deleting the app deletes the copy on your device.

Camera and photos

The app uses your camera, or the system photo picker, only when you choose to take or pick a picture of a chart to analyse. It sees only the pictures you pick and cannot browse the rest of your photo library.

AI processing

When you ask the app to analyse a chart, the app sends the chart images you chose (resized, up to four per analysis), your trading preferences (market, risk level, trading style and analysis depth) and the app's language to OpenAI (model gpt-4o-mini) in order to produce the technical analysis shown in the app. The request goes through a Cloudflare Worker that I operate, which forwards it to OpenAI and does not store the images or the result. Cloudflare sees your IP address when it delivers the request, and the worker uses it only to limit how many analyses can be requested per minute. No name, email address, account or device identifier is sent.

The analysis is generated automatically, can be wrong, and is for information and education only. It is not financial advice or a recommendation to buy or sell anything.

This only happens when you ask for it; nothing is sent for AI processing in the background, and what is sent is used only to produce your result. According to OpenAI's API data usage policy, data sent through OpenAI's API is not used to train OpenAI's models; OpenAI may keep it for a limited period to monitor for abuse, as described in its privacy policy. Please do not include personal details you do not want to share, such as names or account numbers, in what you send.

Notifications

With your permission, the app schedules local notifications on your device with tips about the app's features in the days after you use it and, if you start a free trial, a reminder before it ends. They are created and delivered by your device itself, no data is sent to me to do this, and you can turn them off at any time in your device's notification settings.

Log Data

I want to inform you that whenever you use my Service, in a case of an error in the app I collect data and information (through third party products) on your phone called Log Data. This Log Data may include information such as your device Internet Protocol ("IP") address, device name, operating system version, the configuration of the app when utilizing my Service, the time and date of your use of the Service, and other statistics.

Cookies

Cookies are files with a small amount of data that are commonly used as anonymous unique identifiers. These are sent to your browser from the websites that you visit and are stored on your device's internal memory. This Service does not use these "cookies" explicitly. However, the app may use third party code and libraries that use "cookies" to collect information and improve their services. You have the option to either accept or refuse these cookies and know when a cookie is being sent to your device. If you choose to refuse our cookies, you may not be able to use some portions of this Service.

Service Providers

I may employ third-party companies and individuals due to the following reasons:

• To facilitate our Service
• To provide the Service on our behalf
• To perform Service-related services
• To assist us in analyzing how our Service is used

I want to inform users of this Service that these third parties have access to your Personal Information. The reason is to perform the tasks assigned to them on our behalf. However, they are obligated not to disclose or use the information for any other purpose.

Security

I value your trust in providing us your Personal Information, thus we are striving to use commercially acceptable means of protecting it. All data the app sends to the services above is encrypted in transit. But remember that no method of transmission over the internet, or method of electronic storage is 100% secure and reliable, and I cannot guarantee its absolute security.

Responsible Disclosure Policy

We take the security of our systems and data seriously. If you believe you have discovered a vulnerability, please follow these guidelines:

1. Do not exploit the vulnerability beyond what is necessary to confirm its existence.
2. Do not access, modify, or delete data that does not belong to you.
3. Report the issue to the website owner with details so we can reproduce the finding.
4. We will acknowledge receipt and work to address the issue as quickly as possible.
5. Testing is only authorized within the scope of this policy. Any testing outside of scope may be considered unauthorized and could be subject to legal action.
6. We are not responsible for any damage, loss, or impact to your devices, systems, or data at any time, whether or not it is related to security testing.

Links to Other Sites

This Service may contain links to other sites. If you click on a third-party link, you will be directed to that site. Note that these external sites are not operated by me. Therefore, I strongly advise you to review the Privacy Policy of these websites. I have no control over and assume no responsibility for the content, privacy policies, or practices of any third-party sites or services.

This website

The website this policy is published on is hosted by Vercel, which processes standard server logs (such as your IP address, browser and the page requested) to deliver and protect the site. I count visits with Umami, an analytics tool I host myself: it does not use cookies, does not follow you across other websites and does not store your IP address. It records the page visited, the referring site, your browser, device type and country, and clicks on a few links such as the store buttons.

If you sign up for the newsletter, the only thing I ask for is your email address. It is sent to and stored by Brevo, the service I use to send the newsletter, and is used for nothing else. Every email has an unsubscribe link, and you can unsubscribe at any time.

Children's Privacy

These Services do not address anyone under the age of 13. I do not knowingly collect personally identifiable information from children under 13, and the app never asks for a name, email address or other contact details. If you are a parent or guardian and believe that your child has provided personal information, or that one of the services listed above has collected it, please contact me at support@dczt.dev so that I can have it deleted.

Your Rights and Data Deletion

Depending on where you live, you may have the right to access, correct, delete or export the personal data held about you, to object to or restrict its processing, and to withdraw consent.

Chart AI has no accounts and I do not run servers that store personal data about you, so there is no account or server copy for me to delete. The data the app keeps on your device is deleted when you delete the app.

For data held by the third-party services listed above, you can make a request to each of them directly through the privacy policy linked next to its name. You can also email me at support@dczt.dev with your request: I will pass it on to the services concerned and confirm when it is done.

To have your email address removed from the newsletter, use the unsubscribe link in any email or write to me. You also have the right to lodge a complaint with your local data protection authority.

Changes to This Privacy Policy

I may update our Privacy Policy from time to time. Thus, you are advised to review this page periodically for any changes. I will notify you of any changes by posting the new Privacy Policy on this page.

This policy is effective as of 2026-09-27

Contact Us

If you have any questions or suggestions about my Privacy Policy, do not hesitate to contact me at support@dczt.dev.