Terms of Service

Last updated: 5 October 2026 · Version 1.0

These terms are the agreement between you and the publisher of Lights On. Please read them before using the app. By downloading or using Lights On you accept these terms and the Privacy Policy. If you do not accept them, do not use the app.

1. Who provides Lights On

Lights On (the "App") is published by Nurullah Sevinçkan, an independent developer ("we", "us"). Contact: lightson@memolang.org. We will give our postal address on request. The App is distributed through Google Play and Apple's App Store, each of which has its own terms with you for the store and for payments.

2. Who may use it

The App is not intended for children under 13. If you are under the age of majority where you live, you may use the App only with the consent of a parent or legal guardian, and any purchase must be made with the permission of the person who owns the store account (Google Play account or Apple Account) and the payment method.

You are responsible for everything done through your device, including parties you host and people you invite.

3. What the App does

Lights On plays light shows — screen visuals, camera flash and vibration — in time with music that ships inside the App. You can run a show on one phone, or host a party where several phones join a room and play the same show in sync.

Some features are free and some require a Pro subscription; hosting a party is a Pro feature. The App shows which is which before you use them. The service is provided "as is" and "as available": we do not promise that a show will be perfectly synchronised on every device, network or operating system version, because timing depends on your network, your hardware and the operating system.

4. Your account-free use

There is no registration. The App creates an anonymous technical ID on your device to run rooms and to attach your Pro entitlement. If you uninstall the App, clear its data or change phones, that ID usually changes. Use Restore purchases to attach an existing subscription to a new installation; see section 8.

5. Parties, rooms and limits

A party room is identified by a six-digit code and protected by a PIN that the host sets. Anyone who has the code and the PIN can join. Share them only with people you want in the party.

At the time of writing, the service applies these limits:

a room stays open for about ten minutes from the moment it is created;
up to 12 devices can be connected at the same time, and up to 20 different participants can pass through one room;
a host can create up to 20 rooms per day;
repeated wrong PIN attempts temporarily lock joining for that room.

These limits protect the service and keep costs predictable. We may change them, and we will not change them in a way that empties an active subscription of its value.

6. Your content and how you behave

The content you provide is short: a nickname and, if you host, a party message. You are responsible for it. Do not enter anything unlawful, abusive, hateful, sexual, misleading or infringing, and do not enter other people's personal data. Everyone in the room can see it, so do not put anything private there.

You also agree not to:

use bots, scripts or automated tools against the App or its servers;
try to guess PINs, bypass quotas, capacity or Pro checks, or interfere with other people's rooms;
reverse engineer, decompile or extract the App's code, music or graphics, except where the law expressly allows it;
use the App to harm, harass or endanger anyone — including deliberately directing flashing light at someone who has told you it affects them;
resell, rent or redistribute the App or its content.

We may remove content, close a room or restrict access to the service where we reasonably believe these terms or the law are being broken, or where the service is being abused.

7. Safety — flashing light, sound and your device

Lights On produces rapidly flashing light and strobe effects. A small number of people can have seizures triggered by flashing lights, even with no history of epilepsy. If you or anyone present has photosensitive epilepsy or is sensitive to flashing light, do not use the App, or use only the calmer visuals with reduced motion enabled. Stop immediately and seek medical advice if anyone experiences dizziness, altered vision, eye or face twitching, disorientation, confusion or convulsions.

Warn your guests before starting a show, especially in a dark room. Keep volume at a level that does not damage hearing. Do not use the App while driving or doing anything that needs your attention. Long torch use warms the device and drains the battery; that is normal hardware behaviour and you should stop if the phone becomes uncomfortably hot. Children should use the App only with adult supervision. The App is entertainment software, not a medical, safety or emergency-lighting device.

8. Pro subscription, renewal and cancellation

Where you buy. Pro is sold as an auto-renewing subscription through Google Play on Android and through the App Store on iPhone. The store processes the payment; we never see or store your card details.
Price and period. The price, the billing period and any introductory offer are shown in the App before you confirm the purchase, in your local currency including applicable taxes where the store shows them that way.
Renewal. Payment is charged to your store account when you confirm the purchase. The subscription renews automatically at the end of each period unless you cancel at least 24 hours before it ends, and the renewal is charged within the 24 hours before the period ends: by Google to your Google Play account, or by Apple to your Apple Account.
Cancelling. Cancel any time in the store you bought from: on Android in Google Play (Payments & subscriptions → Subscriptions), on iPhone in the subscription settings of your Apple Account. Cancelling stops the next renewal; Pro stays active until the end of the period you already paid for. The App's settings open the store's subscription page.
Refunds and withdrawal. Refunds follow the refund policy of the store you bought from: Google Play's for Play purchases, Apple's for App Store purchases (requested from Apple, which handles them; we cannot issue App Store refunds ourselves). Where the law of your country gives you a statutory right of withdrawal or cancellation for digital services, that right applies as the law provides; write to us at lightson@memolang.org and we will help.
Price changes. If we change the price of an existing subscription, the store notifies you and asks for your agreement where required; a change never applies to a period you have already paid for.
Restoring. If you reinstall the App or change device, use Restore purchases while signed in to the same store account. A subscription follows the store account, not the phone. A subscription bought in Google Play cannot be restored on an iPhone, and one bought in the App Store cannot be restored on Android.

9. Content, music and intellectual property

The App, its visuals, its interface and the music it contains are protected by copyright and remain ours or our licensors'. We give you a personal, non-exclusive, non-transferable, revocable licence to use the App on devices you control, for your own private use and private gatherings.

The music in the App is produced with the help of artificial intelligence and is included for playback inside the App only. Buying Pro does not give you a licence to broadcast, stream, publicly perform or commercially exploit the music, or to extract the audio files. If you want to use Lights On at a ticketed event, a venue or any other commercial setting, write to us first at lightson@memolang.org.

The App includes open-source components, including its typefaces and software libraries, which remain subject to their own licences.

If you believe something in the App infringes your rights, write to lightson@memolang.org with enough detail to identify the content and your rights, and we will review it.

10. Availability, updates and ending the service

Parts of the App need an internet connection; any mobile data or roaming charges are yours. We may update the App, change or remove features, and carry out maintenance that interrupts the service. Some updates may stop supporting older Android or iOS versions or devices.

We may stop offering the service. If we do, we will give reasonable notice where we can, and where an active paid subscription is affected, we will deal with it fairly and in line with the store's rules and consumer law. When the service ends, your licence to use the App ends with it.

You can stop using the App at any time by uninstalling it. Uninstalling does not cancel a subscription (see section 8) and is not a data deletion request (see the Privacy Policy).

11. Liability

To the extent permitted by law, we are not liable for indirect or consequential loss, lost data, lost profit, or damage caused by a device or network failing to do what you expected. We do not exclude or limit liability for death or personal injury caused by our negligence, for fraud, or for anything else that cannot be excluded under the law that applies to you.

Nothing in these terms takes away the mandatory rights you have as a consumer under the law of the country where you live, including rights about faulty digital content and about unfair terms.

12. Changes to these terms

We may update these terms, for example when features or legal requirements change. The current version always lives on this page with its date and version number. Significant changes are announced in a reasonable way before they take effect; continuing to use the App after that means you accept the new version. Changes that affect an active subscription apply from the next renewal, unless the law requires otherwise.

13. Governing law and disputes

If you use Lights On as a consumer, the mandatory consumer rules of the country where you live apply to you, and you can bring a claim before the courts of that country. Nothing here takes that away.

For everything else — commercial use, or a dispute about abuse of the service — the laws of the country where the publisher is established apply, currently the Republic of Türkiye.

We would much rather sort a problem out by email than in a courtroom, so please write to lightson@memolang.org first. If a provision of these terms is found invalid, the rest stays in force.

14. Contact

Questions, complaints, copyright notices and commercial-use requests: lightson@memolang.org. We answer as soon as we reasonably can.

15. If you downloaded the App from Apple's App Store

These additional terms apply when you got the App from the App Store. Where they conflict with the rest of these terms, this section wins for App Store users.

Your licence to use the App is governed by Apple's standard Licensed Application End User License Agreement. These terms add to it; where both cover the same point, Apple's agreement governs your licence to the App.

These terms are between you and us, not with Apple Inc. ("Apple"). We, not Apple, are solely responsible for the App and its content.
Your licence in section 9 is limited to using the App on Apple-branded products that you own or control, as permitted by the Usage Rules in the Apple Media Services Terms and Conditions (which also allow use by other accounts in your Family Sharing group where the App supports it).
Apple has no obligation to provide any maintenance or support for the App. Support comes from us: lightson@memolang.org.
If the App fails to conform to any warranty that applies to it, you may notify Apple, and Apple will refund the purchase price, if any, of the App to you. To the maximum extent permitted by law, Apple has no other warranty obligation regarding the App; any other claims, losses, liabilities, damages, costs or expenses caused by a failure to conform to a warranty are our responsibility, to the extent the law and these terms make them so.
We, not Apple, are responsible for addressing any claims by you or a third party about the App or your possession or use of it, including product liability claims, claims that the App fails to meet a legal or regulatory requirement, and claims under consumer protection, privacy or similar laws.
If a third party claims that the App or your possession and use of it infringes their intellectual property rights, we, not Apple, are solely responsible for investigating, defending, settling and discharging that claim.
You confirm that you are not located in a country that is subject to a U.S. Government embargo or that has been designated by the U.S. Government as a "terrorist supporting" country, and that you are not listed on any U.S. Government list of prohibited or restricted parties.
You must comply with any third-party terms that apply when you use the App, such as your mobile data agreement.
Apple and its subsidiaries are third-party beneficiaries of these terms. Once you accept them, Apple has the right (and is deemed to have accepted the right) to enforce them against you as a third-party beneficiary.