These are the terms for using Tiang, the home design and simulation app made by Tiang (“Tiang”, “we”, “us”). By installing or using the app you accept them. If you do not, please do not use the app. Like the privacy policy, this is written to be read.
What Tiang is — and what it is not
Tiang is a design and estimation tool, not professional advice. The temperature, humidity, electricity, solar and WiFi results it produces are estimates, produced by simplified physical models from the building you drew and the weather data available for the place you pinned. They are there to help you compare choices — this wall against that one, this much insulation against more — and to show you which direction a decision moves things.
They are not a substitute for an architect, an engineer, an electrician or a building surveyor, and they are not a compliance calculation. Do not use them as the basis for structural, electrical, thermal or safety decisions, for building control or permit submissions, or for anything where being wrong has a cost. Real buildings differ from drawings, weather differs from forecasts, and materials differ from their datasheets. Have anything that matters checked by a qualified professional for your jurisdiction.
We do not warrant that the results are accurate, complete or suitable for any particular purpose, and we are not liable for decisions taken on the strength of them.
Your account
You can draw without an account. Signing in, with Google or with Apple, is what makes backup, sharing and subscriptions possible; backing up and sharing projects also need Tiang Pro. You are responsible for the account you sign in with; do not share it with people you would not want reading your projects.
You must be at least 13 years old to use Tiang.
Your designs are yours
You own what you draw. We claim no rights over your projects. We store and transmit them only to run the service you asked for — backing them up, syncing them to your other devices, running the simulations, and sharing them with people you invite. We do not use them to train anything, we do not show them to anyone you did not invite, and we do not sell them. See the privacy policy for the detail.
The free tier and Tiang Pro
Drawing is free and unlimited. Simulations, timelapses and PDF export have a monthly allowance on the free tier; the current numbers are shown in the app. We may change those allowances — they exist to keep the server affordable, and what one run costs us is not fixed forever.
Tiang Pro is a subscription sold through Google Play on Android, and through Apple’s App Store on iPhone, iPad and Mac. Payment, renewal, price changes and refunds are handled by the store you bought it from, under its terms, not by us.
- It renews automatically at the end of each period, and the store charges you again, until you cancel. On the App Store, turn off renewal at least 24 hours before the period ends: Apple charges for the next period within those last 24 hours.
- If your plan starts with a free trial, cancel before the trial ends and you will not be charged.
- To manage or cancel it: on Android, Google Play → Subscriptions; on an iPhone or iPad, Settings → your name → Subscriptions; on a Mac, the App Store app → your name → Account Settings. In the app, Profile → Manage Subscription opens the right page. When you cancel, Pro stays on until the end of the period you have paid for.
- Refunds come from the store, under its own policy: ask Apple at reportaproblem.apple.com for an App Store purchase, or Google Play for a Google Play one.
Deleting your Tiang account does not cancel your subscription — cancel in the store first, or you will keep being charged.
If a subscription lapses, your projects stay where they are. You keep everything you drew; the paid features stop. Your Backup & Restore snapshots stay on our server, locked, until you subscribe again, and deleting your account deletes them.
Using it fairly
Please do not: work around the free-tier allowance, whether by rotating accounts or otherwise; attack, overload or probe the service; reverse-engineer the app except where the law says you may; resell access to it; or use it to break the law. We may suspend an account that does these things.
The service can change
Tiang is developed by one person and it changes often. Features may be added, altered or removed, and the app requires a working version to reach the server — very old builds stop being supported. We will not remove your ability to open and export designs you have already made without warning.
We do not promise the service will be uninterrupted. It runs on a single server and it will occasionally be down.
Ending it
You can stop at any time: delete your account inside the app under Profile → Delete My Account, which removes everything synced to it, or simply uninstall. We may suspend or close an account that breaks these terms, or if we have to stop running the service — in which case we will give what notice we reasonably can.
Liability
Tiang is provided “as is”. To the extent the law allows, we exclude implied warranties, and we are not liable for indirect or consequential loss, lost profits, lost data, or the cost of building work. Where liability cannot be excluded, it is limited to what you have paid us in the twelve months before the claim — which, if you have never subscribed, is nothing.
Nothing here limits liability that cannot be limited by law, including for death or personal injury caused by negligence, or for fraud. If you are a consumer, you keep every right your local law gives you, and nothing in these terms takes those away.
Other people’s services
Tiang uses Google sign-in, Sign in with Apple, Google Play, Apple’s App Store, RevenueCat, Meta’s measurement component on Android, and the weather and map services listed in the privacy policy. Their terms apply to their parts, and we are not responsible for them being available or correct.
If you got Tiang from the App Store: these terms are between you and Tiang, not Apple. Apple is not responsible for the app or its content, and has no duty to support or maintain it — that is ours. Apple’s own App Store terms also apply to how you use it.
Law
These terms are governed by the laws of the Republic of Indonesia, where Tiang is made. If you are a consumer somewhere else, this does not deprive you of the protection of the mandatory consumer law where you live.
Changes
We may update these terms. When something material changes, the effective date at the top changes with it. Continuing to use the app after that means you accept the new version.
Contact
Questions about these terms: tiangbuildingapp@gmail.com.