The rules for using Thayln.

These terms are the agreement between you and Thayln ("we", "us"), of Sydney, New South Wales, Australia. They cover the Thayln app on your PC, your Thayln account, Thayln Plus, the AI Store and our websites. By creating an account or using Thayln, you agree to them. We've kept them as short and plain as we can. Nothing in them takes away rights you have under the Australian Consumer Law.

Who can use Thayln

• Thayln accounts are for people aged 18 and over. The app asks you to confirm you're 18 or older. Please don't use Thayln if you aren't.
• You need to be able to make a binding agreement where you live.
• One account is for one person. Keep it to yourself.
• If you use Thayln for a business, you confirm you can accept these terms for it.

Your account and signing in

• You sign in with a 6-digit code that we email you. There are no passwords. That means your email account is the key to your Thayln account, so keep your email secure.
• Never share a sign-in code. We will never ask you for one.
• Your account lives at thayln.com/account. It shows your plan, your sign-in history and the PCs you've connected. If you see something you don't recognise, email hello@thayln.com straight away.
• Give us an email address that's yours and that works. We use it to sign you in and to tell you about your account.

What Thayln is

• Thayln runs on your Windows PC. Its own AI runs on your PC too.
• Your chats, memories, files, photos, vault and settings stay on your PC. Chats between people are end-to-end encrypted.
• If you choose, you can use a cloud AI with your own API key. Your key and your requests go only to that AI provider, never to us. You can also connect your own AI server.
• On Plus, you can choose "Thayln's own AI". Your requests then go through our servers to an AI provider (Anthropic's Claude) on our key. We pass them on to get your answer. We don't keep the content.
• How we handle your information is set out in our Privacy Notice.

About AI answers

• AI can be wrong, out of date or incomplete, and it can sound sure when it isn't. Check anything important before you rely on it.
• Thayln isn't a doctor, lawyer, accountant or financial adviser. Its answers aren't professional advice. For those things, talk to a qualified person.
• Thayln asks before it sends, deletes or pays for anything. You're responsible for what you approve.
• If you use a cloud AI with your own key, or your own AI server, that provider's terms also apply to what you send it.

Your things are yours

• What you create, write, say or store with Thayln belongs to you (or whoever owns it already). We don't claim it.
• Because it stays on your PC, we can't see it, and we don't need a licence to use it. When you use Thayln's own AI on Plus, you let us pass your request to the AI provider only so you get your answer.
• Things you send us on purpose, such as an email, an app report or a feature request at thayln.com/ideas, we may use to help you and to improve Thayln. If you suggest an idea, we can build it without owing you anything for it.

Using Thayln fairly

Please don't use Thayln, the AI Store or our websites to:

• break the law, or help someone else break it;
• harass, threaten, stalk or harm anyone, or share someone's private information without their permission;
• send spam or messages people haven't agreed to;
• make or share material that sexually exploits children, or any other illegal content;
• infringe someone's copyright, trade mark or other rights;
• spread malware, or try to get into accounts, PCs or systems that aren't yours;
• get around our sign-in, plan limits, abuse limits, app sandbox or app signing;
• overload or disrupt our servers, or scrape them in bulk;
• resell or share Thayln's own AI, or your Plus access, with people outside your account.

Plans and payment

• Free costs US$0.
• Plus is US$15.99 a month, or US$12.79 a month billed yearly (US$153.50 a year), at our Founders price for your first year. Plus will be US$25 a month when Thayln is released. After your first year, the introductory price may move to the higher price. We'll tell you before that happens, and you can cancel before it applies.
• You can have a 14-day free trial of Plus once per person. People on our early-access waitlist get 30 days of Plus.
• Prices are in US dollars only. Your bank or card provider may convert the amount and charge its own fees. Prices shown include any GST that applies.
• Payments are handled by Stripe. Stripe holds your card details; we never see them. Stripe's own terms also apply to your payment.
• Subscriptions renew automatically at the end of each month or year until you cancel. You can cancel at any time in your account. Cancelling stops the next payment, and Plus keeps working until the end of the period you've paid for.
• If a payment fails and isn't sorted out, Plus stops and your account goes back to Free. Your things on your PC aren't affected.
• Refunds are covered on our Refunds and cancellations page.

The AI Store

• The AI Store has apps and skills made by other developers, not by us. Each one is reviewed before it's listed, by an AI review (using our access to Anthropic's Claude) and by people. A review lowers risk, but it can't catch everything.
• For paid apps, Thayln is the seller of record. You buy from us, and we handle payment and refunds.
• An app is free, a one-time purchase (from US$1.99), or a subscription (from US$0.99 a month, sometimes with a yearly option). A developer may also offer one subscription to all their paid apps.
• If you cancel an app subscription, the app keeps working until the end of the period you've paid for. When it ends, the app is switched off on your PC. Its data is kept, so it's there if you subscribe again.
• If your PC is offline, a subscription app keeps working for up to 7 days before it needs to check in.
• If a developer moves an app off subscriptions, people who were subscribed keep the app for good.
• Apps run in a locked-down sandbox on your PC. They can only do what you've allowed (for example storage, AI, notifications or the microphone), and only reach the internet hosts they've declared or that you allow. Read what an app asks for before you approve it.
• A paid app's developer must give a support contact and a privacy policy on their profile. That privacy policy covers what the app does with your information. The developer is responsible for their app.
• If an app looks wrong, harmful or misleading, report it from the AI Store. We can remove apps, and we'll tell you if something you have is affected.
• Developers who make apps agree to our Developer Agreement and App Privacy Rules and Store Guidelines.

Our software and your licence

• Thayln, its software, name, logo and websites belong to us or the people who licence them to us.
• While you follow these terms, we give you a personal, non-transferable licence to install and use Thayln on your own PCs.
• Please don't copy, sell or rent Thayln, remove its notices, tamper with its licence or integrity checks, or reverse engineer it, except where the law lets you.
• Where parts of Thayln are open-source software, their own licences apply to those parts.

Changes to Thayln

• We keep improving Thayln. Features may be added, changed or retired. If we remove something important that you've paid for, we'll tell you first, and you can cancel.
• Some updates are needed for security or to keep things working with our servers. We may ask you to update to keep using some features.
• We aim to keep our servers running, but they may sometimes be down, for example for maintenance. Thayln's own AI on your PC keeps working without them.

Pausing or closing accounts

• You can close your account at any time. Email hello@thayln.com or use the account site. We check it's really you, switch the account off, and delete it 14 days later. Until then you can change your mind.
• We may pause or close an account if it seriously or repeatedly breaks these terms, if the law requires it, or to protect people or Thayln. Where it's fair and safe to, we'll warn you first and give you a chance to fix things.
• If we close your account and it isn't because you broke these terms, we'll refund any unused part of a paid period.
• If we close your account because it seriously broke these terms, you can't make a new account with the same email address.
• Closing your account doesn't delete what's on your PC. That stays yours.

Your consumer rights

Our goods and services come with guarantees that cannot be excluded under the Australian Consumer Law. For a major failure with a service, you're entitled to cancel your contract with us, and to a refund for the unused part or compensation for its reduced value. For a major failure with digital goods (such as an app), you're entitled to a replacement or a refund. You're also entitled to be compensated for any other loss or damage that could reasonably have been expected. If a failure isn't a major failure, you're entitled to have it fixed in a reasonable time. If it isn't fixed, you can cancel and get a refund for the unused part.

Nothing in these terms excludes, restricts or changes those rights, or any other right you have under the Australian Consumer Law (Schedule 2 of the Competition and Consumer Act 2010 (Cth)) or other laws that can't be excluded. The ACCC explains them. If you live outside Australia, your local consumer laws may give you rights too, and these terms don't take those away either.

Limits on our responsibility

This section applies only as far as the law allows, and never limits your consumer guarantee rights above.

• Apart from those guarantees, Thayln is provided as it is. We don't promise it will be error-free or always available, or that an AI answer will be right.
• We're not responsible for apps, skills, AI providers, AI servers or other services made by others, except where we're the seller of record or the law makes us responsible.
• We're not liable for loss that happens because you didn't follow these terms, or for loss we couldn't reasonably have expected.
• Where the law lets us limit our liability for failing a consumer guarantee, our liability is limited to supplying the service again, or paying the cost of having it supplied again.
• Otherwise, our total liability to you is limited to the amount you paid us in the 12 months before the claim.
• None of this limits liability for anything the law says can't be limited, such as our own fraud.

Changes to these terms

• We may update these terms as Thayln changes or the law changes. If a change matters to you, we'll email you at least 30 days before it takes effect.
• If you don't agree with a change, you can cancel before it applies. If you've paid in advance, we'll refund the unused part.
• The date at the bottom shows when these terms last changed.

If we disagree

• Please talk to us first at hello@thayln.com. Most things can be sorted out quickly.
• These terms are governed by the law of New South Wales, Australia. You and we agree to the courts of New South Wales (sitting in Sydney), and the courts that can hear appeals from them.
• This doesn't stop you using your rights under the Australian Consumer Law, going to a consumer tribunal or regulator, or using the consumer laws and courts of the place where you live if they apply to you.

The rest

• These terms, our Privacy Notice and our Refunds and cancellations page are the whole agreement between us about Thayln.
• If part of these terms can't be enforced, the rest still applies.
• If we don't enforce something straight away, we can still enforce it later.
• You can't transfer your account or these terms to someone else. We may transfer them to a business that takes over Thayln, and we'll tell you if we do. Your rights won't be reduced.

Contact

Email hello@thayln.com. Emails are first read and answered by Thayln's AI email assistant, which tells you it's an AI. Reply "human" to reach a person. Anything about money or security goes to a person.

Last updated 21 October 2026. Draft for legal review.