End User Licence Agreement

Last updated: 28 August 2026

Geddy is licensed to you, the end user, by Tagir Aiupov, a sole proprietor based in British Columbia, Canada ("Licensor", "we", "us"), for use only under the terms of this Licence Agreement.

By downloading Geddy (the "Licensed Application") from Apple's App Store, and any update to it, you agree to be bound by this Licence Agreement. The App Store is referred to here as the "Services".

You and we both acknowledge that Apple is not a party to this Licence Agreement and has no obligations at all in relation to the Licensed Application — including warranty, liability, maintenance, and support. Tagir Aiupov, not Apple, is solely responsible for the Licensed Application and its content.

This Licence Agreement does not provide usage rules that conflict with the Apple Media Services Terms and Conditions (the "Usage Rules"). We confirm that we have had the opportunity to review the Usage Rules and that this agreement is consistent with them.

This agreement sits alongside our Terms of Service and Privacy Policy. Where this agreement and the Terms of Service cover the same ground, the Terms of Service govern your use of the Services generally, and this agreement governs your licence to the software itself.

The application
Safety and the limits of the model
Scope of licence
Technical requirements
Maintenance and support
Use of data
Your content
Liability
Warranty
Product claims
Legal compliance
Contact information
Termination
Third-party terms and beneficiary
Intellectual property rights
Applicable law
Miscellaneous

1. The application

Geddy is an application for iPhone that tells you when the sun at your location is high enough to produce vitamin D, estimates how much a session produced, and holds that session inside a burn ceiling.

It computes solar elevation for your coordinates and the date, treats roughly 45° of elevation as the productive threshold that defines the day's window, fetches the current UV index and cloud cover from Apple WeatherKit, and combines those with your Fitzpatrick skin type, exposed skin fraction, and age to produce an estimated IU figure with bounds and a burn ceiling derived from the minimal erythemal dose for your skin type. It runs a Live Activity while a session is going, sends a time-sensitive local notification when you reach the ceiling, logs sessions, writes them to Apple Health as Time in Daylight, and records blood 25(OH)D results so the model can be charted against your own lab work.

This section describes what the application is capable of, not what is included without payment. Sessions are limited to three unless you subscribe to Geddy Pro, and the session timer, the burn ceiling and its alert are part of that subscription. Section 8 of the Terms of Service sets out exactly what is free and what is not.

There is no account and no sign-in of any kind. The Licensed Application synchronises your data to your own iCloud account and to no other service; we operate no server and receive none of it.

2. Safety and the limits of the model

Geddy estimates. It does not measure. The vitamin D figure it produces is a model output whose coefficients have not been traced to a named source, and the application discloses this wherever the figure appears. The burn ceiling is likewise an estimate, computed from a weather service's UV index, and it cannot know whether you are in shade, wearing sunscreen, at altitude, on snow or water, or taking a medication that changes how your skin reacts.

Geddy is not medical advice, is not a medical device, and does not diagnose, treat, cure, prevent, or monitor any condition. Do not use it to decide on supplementation, to manage a diagnosed deficiency, or in place of a blood test or a doctor. Never treat "time remaining" as permission to stay in the sun. Ultraviolet radiation causes skin cancer, and no amount of exposure is risk-free.

Section 3 of our Terms of Service sets all of this out in full, including who should speak to a doctor before using the app at all. Please read it.

The Licensed Application is not built to comply with sector-specific regulation such as the Health Insurance Portability and Accountability Act (HIPAA), the Federal Information Security Management Act (FISMA), or the Gramm-Leach-Bliley Act (GLBA). If your use would be subject to laws of that kind, you may not use the Licensed Application.

3. Scope of licence

3.1 You are granted a non-transferable, non-exclusive, non-sublicensable licence to install and use the Licensed Application on any Apple-branded devices that you own or control, as permitted by the Usage Rules. Other accounts associated with you through Family Sharing or volume purchasing may also use it, as the Usage Rules allow.

3.2 This licence also governs any update to the Licensed Application that we provide, unless that update comes with its own licence, in which case the new licence governs.

3.3 You may not share, sell, rent, lend, lease, or otherwise redistribute the Licensed Application, except as the Usage Rules expressly allow.

3.4 You may not reverse engineer, decompile, disassemble, translate, modify, adapt, or create derivative works from the Licensed Application, or attempt to derive its source code — except to the extent that applicable law expressly permits this despite the restriction, such as the interoperability rights granted under EU and UK software law.

3.5 You may not copy the Licensed Application except as this licence and the Usage Rules allow, and you may not remove any intellectual property notices — including the Apple Weather attribution and its legal link, which appear wherever weather data is displayed and are a condition of the licence under which we obtain that data. If you sell or give away a device, remove the Licensed Application from it first.

3.6 Weather data supplied through the Licensed Application is licensed to you for your personal use of the application only. You may not extract, redistribute, resell, or build a service on that data.

3.7 We reserve all rights not expressly granted to you here.

3.8 Nothing in this licence restricts third-party terms that apply to you. When using the Licensed Application you remain responsible for complying with them.

4. Technical requirements

4.1 The Licensed Application requires iOS 26.2 or later. It is designed for iPhone and also runs on iPad. The Live Activity requires a device and iOS version that support Live Activities, and the Dynamic Island presentation requires hardware that has one.

4.2 Weather data requires a network connection. Without one, the Licensed Application still computes the sun's position — that calculation is local — but it will report that dose and ceiling figures are unavailable rather than estimate them from stale or absent data.

4.3 We aim to keep the Licensed Application working with new versions of iOS and new hardware, but you do not have a right to demand any particular update.

4.4 It is your responsibility to confirm that your device meets these requirements before purchasing or subscribing.

4.5 We may change the technical requirements as the app develops. Where a change would stop the app working on a device you already use it on, we will give reasonable notice through the App Store release notes.

5. Maintenance and support

5.1 We are solely responsible for providing maintenance and support for the Licensed Application. You can reach us at [email protected], or at the address listed on the App Store page for the app.

5.2 You and we both acknowledge that Apple has no obligation whatsoever to provide any maintenance or support services for the Licensed Application.

6. Use of data

We may periodically collect and use technical information about your device, operating system, and the application software in order to provide support, deliver software updates, and improve the Licensed Application. Our full and specific account of what is collected — and, importantly, what is not — is in our Privacy Policy.

The essential points:

Your sessions, dose history, blood results, saved locations, and settings stay on your device and in your own iCloud account. They are synchronised through Apple's iCloud, to the private database of Geddy's iCloud container, so they reach your other devices. That database is yours: we cannot read it, and we do not receive its contents. Sync can be switched off in iOS Settings.
Your coordinates are sent to Apple WeatherKit to obtain the UV index and cloud cover, and the text you type in location search is sent to Apple MapKit. Both go to Apple. Neither goes to us. Setting your position by hand is a fully supported alternative to granting location access.
Health is written to only with your permission, and never read from. The Licensed Application requests write access alone. We never receive Health data, never use it for advertising or marketing, and never sell or share it with anyone.
The application contains no analytics SDK and requires no account. It shows one advert, in the Profile screen, through Kickstart Exchange — a swap in which independent developers show each other's apps. It is not targeted at you, and the privacy policy sets out exactly what Kickstart is told.

7. Your content

Everything you record in the Licensed Application belongs to you. We claim no ownership of it and no licence over it, and we do not receive it.

Geddy has no chat, no forums, no message boards, and no other users. Nothing you record is published, shared, or made visible to anyone by us.

Note that the Live Activity displays session figures on your Lock Screen and in the Dynamic Island by design, where anyone who can see your phone can read them. Section 7 of our Terms of Service explains this.

Because your content lives on your device and in your own iCloud account, and never on any system of ours, you alone are responsible for what you put in it and for keeping backups.

8. Liability

8.1 Our liability for breach of obligation and in tort is limited to intent and gross negligence. In the case of a breach of an essential contractual duty, we are also liable for slight negligence, but in that case liability is limited to foreseeable damage typical of this kind of contract. These limits do not apply to injury to life, limb, or health, to fraud, or to any liability that cannot be limited under the law that applies to you.

8.2 We accept no responsibility for damage caused by your breach of section 3. If you modify or tamper with the Licensed Application, you may lose access to it.

8.3 Your data is stored on your device and synchronised to your own iCloud account. We hold no copy of it and cannot restore it. Synchronisation is a mirror rather than a backup: a record deleted on one device is deleted on all of them, and it operates only while your iCloud account is available to you and the Licensed Application is enabled in your iCloud settings. We are not liable for data lost through deletion of the Licensed Application or its iCloud data, through a deletion you did not intend, through exhaustion of your iCloud storage, through loss of access to your Apple Account, or through loss of or damage to your device. Keep an encrypted device backup, and keep your own record of lab results. Matters concerning iCloud, iCloud Backup, account recovery, and device backups are between you and Apple, under Apple's terms.

8.4 Nothing in this section limits the statutory rights of consumers under the mandatory laws of the country where you live, and nothing in it limits any liability arising from personal injury.

9. Warranty

9.1 We warrant that the Licensed Application is free of spyware, trojan horses, viruses, and other malware at the time you download it, and that it works substantially as described in its documentation and App Store listing.

9.2 We give no warranty as to the accuracy of any dose estimate, burn ceiling, window time, UV index, or cloud figure. Those are model outputs and third-party weather data, and section 2 of this agreement and section 3 of the Terms of Service explain what they can and cannot tell you.

9.3 No warranty is given where the Licensed Application cannot run on your device, or where it has been modified without authorisation, handled inappropriately, combined with unsuitable hardware or software, or affected by anything else outside our control. In particular, the timing of notifications and the refresh of the Live Activity are controlled by iOS, and we do not warrant that iOS will deliver or refresh them at any particular moment.

9.4 Please inspect the Licensed Application after installing it and tell us about any defect without undue delay, by email to [email protected]. We will investigate a defect report made within ninety (90) days of you discovering the problem.

9.5 If we confirm a defect, we may choose to fix it or to provide a replacement.

9.6 If the Licensed Application fails to conform to any applicable warranty, you may notify Apple, and Apple will refund the purchase price you paid for it. To the maximum extent permitted by law, Apple has no other warranty obligation of any kind in relation to the Licensed Application, and any other claims, losses, liabilities, damages, costs, or expenses attributable to a failure to conform to a warranty are our responsibility.

9.7 If you are a business user, claims based on defects expire twelve (12) months after the Licensed Application was made available to you. If you are a consumer, the statutory limitation periods where you live apply instead.

10. Product claims

You and we both acknowledge that we, and not Apple, are responsible for addressing any claim by you or any third party relating to the Licensed Application or your possession or use of it, including:

product liability claims;
any claim that the Licensed Application fails to conform to an applicable legal or regulatory requirement; and
claims arising under consumer protection, privacy, or similar legislation.

11. Legal compliance

You represent and warrant that you are not located in a country subject to a United States government embargo or designated by the United States government as a "terrorist supporting" country, and that you are not on any United States government list of prohibited or restricted parties.

12. Contact information

For questions, complaints, or claims about the Licensed Application:

Tagir Aiupov, sole proprietor, British Columbia, Canada Email: [email protected]

Geddy is a one-person operation run from a home office, so we do not publish a street address. Email is the fastest way to reach us and is checked by a person. If you need our full registered details in order to serve formal notice or to satisfy a regulator, ask by email and we will provide them.

13. Termination

This licence lasts until terminated, by you or by us. Your rights under it end automatically if you fail to comply with any of its terms. On termination you must stop using the Licensed Application and delete all copies of it.

Deleting the app from your device does not, by itself, cancel any subscription. See section 8 of our Terms of Service for how to cancel through Apple.

14. Third-party terms and beneficiary

We confirm that we will comply with applicable third-party terms of agreement in providing the Licensed Application — including Apple's terms for WeatherKit, MapKit, and HealthKit — and you must comply with any third-party terms that apply to you when using it.

In accordance with Apple's Instructions for Minimum Terms of Developer's End-User Licence Agreement, Apple and Apple's subsidiaries are third-party beneficiaries of this Licence Agreement, and upon your acceptance of its terms Apple will have the right — and will be deemed to have accepted the right — to enforce this Licence Agreement against you as a third-party beneficiary.

15. Intellectual property rights

You and we both acknowledge that if a third party claims the Licensed Application, or your possession and use of it, infringes that third party's intellectual property rights, we, and not Apple, are solely responsible for the investigation, defence, settlement, and discharge of that claim.

16. Applicable law

This Licence Agreement is governed by the laws of the Province of British Columbia and the federal laws of Canada that apply there, excluding conflict-of-law rules.

If you are a consumer, this does not deprive you of the protection of the mandatory laws of the country where you live.

17. Miscellaneous

17.1 If any term of this agreement is or becomes invalid, the remaining terms are unaffected. An invalid term is replaced by a valid one that comes closest to its original purpose.

17.2 Changes and amendments to this agreement are valid only in writing, and this requirement itself can only be waived in writing.

17.3 Data storage. Data you create in the Licensed Application is stored on your device, in the application's own sandbox, and synchronised to your own iCloud account. This includes your profile, your sessions and their coordinates, your saved locations, your blood 25(OH)D results, and your settings. Synchronisation is to Apple's iCloud and to nowhere else — into the private database of the Licensed Application's iCloud container, which is held by Apple under your Apple Account. We operate no server, hold no copy, and have no means of reading that database. Synchronisation can be disabled at any time in iOS Settings, in which case your data remains on the device that recorded it. Further copies may exist in whatever encrypted device or iCloud backup you keep, which are governed by Apple's terms. Sessions written to Apple Health live in the Health store, under Apple's terms and your own Health privacy settings. We may add or change data storage features in future, and where such a change would affect data you already hold we will give reasonable notice through the App Store release notes. Section 8.3 sets out how liability for data loss is allocated.