Terms of Use

These Terms of Use ("Terms") govern your use of Linemate: AR Drawing Tracer ("the app"), provided by Sensi Tech ("we", "us"). By installing or using the app you agree to these Terms. If you do not agree, please do not use the app. Our Privacy Policy explains how data is handled.

1. What the app does

The app helps you copy a drawing onto real paper. It shows a semi-transparent sketch over your phone's live camera picture (Camera mode and AR mode) or on a bright screen you place paper on (Screen mode), and you trace the lines by hand. It also includes a library of line sketches, step-by-step lessons, a 14-Day Path, basic drills, Photo to Sketch (turns your photo into lines on your phone), Words to Sketch (builds a page from the app's own sketches that match the words you type), Lettering, a grid, multi-page posters, time-lapse recording and background music.

In Camera mode the app uses the normal camera picture, so the sketch stays fixed on the screen, not on the paper: keep the phone still (the Setup Guide shows how) and use the image lock. AR mode works only on phones that support Google Play Services for AR (ARCore). It uses augmented-reality tracking to keep the sketch on your paper while the phone moves; tracking needs good light and a textured surface, and the sketch can drift or need to be placed again. The app does not modify your device, other apps, or anything outside its own storage.

2. Results vary

How easy and accurate tracing is depends on your phone's camera, screen brightness, lighting, the stand you use and your own practice. We do not promise any particular drawing result, skill level or speed of progress. Levels, the 14-Day Path and the compare slider are practice aids, not a measurement or certification of skill.

3. Words to Sketch

Words to Sketch does not generate new images. It looks up the words you type among the sketches already included in the app and places the matching sketches on one page, which you can move and resize. It works on your phone without an internet connection, and the words you type are not sent anywhere. If no included sketch matches a word, that word is left out.

4. Your content and other people's images

Your drawings, photos and recordings remain yours and stay on your device unless you share them. When you use Your Photo or Photo to Sketch, you are responsible for making sure you have the right to use and reproduce the images you trace, especially if you sell or publish the result. Images found on the web are usually protected by copyright. The sketches, lessons and fonts included in the app may be used for personal drawing; the fonts are open-license fonts used under their own licences.

5. Licence

We grant you a personal, non-exclusive, non-transferable, revocable licence to use the app on devices you own or control, for personal, non-commercial purposes. You may not copy, resell, rent or redistribute the app or its built-in content as a collection, reverse engineer or decompile the app except where the law allows it, remove notices, or bypass its advertising or purchase system.

6. Advertising

The app is free and shows ads from Google AdMob. Ads are never shown on the tracing screen. Ads are limited in frequency and are never shown to VIP subscribers. Rewarded ads are always optional: an ad plays only after you tap the button that offers time without ads yourself, and watching it to the end turns off ads for the time shown on that button (2 hours unless the button says otherwise); it does not unlock any feature. Ads are provided by third parties and we are not responsible for the products or services they promote.

7. VIP subscription

VIP is optional and only removes ads. Every feature and all content in the app are free for everyone, with or without VIP.

• VIP is sold and billed by Google Play, weekly or yearly, at the price shown on the Remove Ads screen and in Google Play before you confirm.
• Where a free trial is offered, its length and the date you will first be charged are shown before you confirm. If you do not cancel before the trial ends, the subscription starts and is charged automatically.
• The subscription renews automatically at the end of each period until you cancel it.
• You can cancel at any time in Google Play → Profile → Payments and subscriptions → Subscriptions, or from the app (Settings → Manage subscription). Cancelling stops future renewals; VIP stays active until the end of the period you already paid for. Uninstalling the app does not cancel the subscription.
• Refunds are handled by Google under the Google Play refund policy. We cannot issue refunds directly because we never receive your payment details.
• If the price changes, Google Play notifies you in advance and you can decline the new price by cancelling.

8. Third-party services

Some features rely on services we do not control: Google Play (purchases), Google AdMob (ads), Google Firebase (analytics and crash reports), and Google Play Services for AR (AR mode). Your use of them is also subject to their own terms and policies, and we are not responsible for their availability or content.

9. Acceptable use

Do not use the app to break the law, to infringe intellectual-property or privacy rights, to create or spread harmful content, or to interfere with the app, its servers or its ads (for example by generating fake ad clicks). Be aware of your surroundings while using the camera, and keep the phone stable and away from water and heat while tracing.

10. No warranty

The app is provided "as is" and "as available", without warranties of any kind, express or implied, including fitness for a particular purpose and uninterrupted or error-free operation, to the extent permitted by law. Features that need the internet may change or stop working if a third-party service changes.

11. Limitation of liability

To the maximum extent permitted by law, Sensi Tech is not liable for indirect, incidental, special or consequential damages, or for loss of data, drawings or profits, arising from your use of or inability to use the app. Our total liability for any claim is limited to the amount you paid for the app in the twelve months before the claim. Nothing in these Terms limits liability that cannot be limited by law.

12. Termination

You can stop using the app at any time by uninstalling it (and cancelling any subscription in Google Play). We may suspend or end your licence if you seriously breach these Terms. Sections 4, 10, 11 and 14 survive termination.

13. Changes

We may update these Terms when the app changes. The updated version will be posted on this page with a new effective date. Continuing to use the app after an update means you accept the new Terms.

14. Governing law

These Terms are governed by the laws of Vietnam, where Sensi Tech is established. This does not take away any mandatory consumer protection rights you have under the laws of the country where you live.

15. Contact

Questions about these Terms: Sensi Tech, CC Đồng Phát, Hà Nội 11700, Vietnam. Email: hanhnt3009.ffh4x.publish@gmail.com