Last updated November 5, 2026.
These terms are the agreement between you, a coach or a coaching business (“you”), and Dad with Style OÜ, Sepapaja tn 6, Tallinn 15551, Estonia (registry code 14696867) (“we”), for your use of Stack and its coaching console. By opening a coach account you accept them, and you confirm that you are acting in your business and may bind it. The data processing agreement forms part of these terms. Write to [email protected].
We provide software. We don’t coach your clients, employ you, or check your qualifications. You alone are responsible for your coaching: every program, target, message and piece of advice, even where Stack suggested or calculated it.
Stack is not a medical device and doesn’t diagnose, treat or prevent any condition. Don’t present it as a medical or healthcare service. Its numbers, including AI estimates, can be wrong: review them before you rely on them.
You are the controller of your clients’ coaching records, and we process them for you under the data processing agreement. You must:
Data you copy out of Stack, into your own files, messages or AI tools, is your own responsibility and outside our agreement. We process some data for our own purposes, outside your instructions, and you allow it: your account and billing; the service’s security and error reports; counts of how the app is used; the food words and corrections kept without anyone’s name; and the quality checks, which pass on only counts. For these we are the controller, as our privacy policy says.
The price, billing period and any trial are shown before you confirm. Fees are charged in advance and, unless the law says otherwise, aren’t refunded for a part period. We give you at least 30 days’ notice of a price change, and you can cancel before it applies. You pay any taxes on your fees.
Stack, its code, design, words and food data belong to us or to those who license them to us. We give you a personal, non-exclusive license to use it for your coaching while these terms last. Your programs, notes and materials stay yours, and you let us store, copy and show them only to run Stack for you. We may use information that identifies no one, such as counts and food corrections, to improve Stack.
We work to keep Stack right and running, but we can’t promise it is always available or free of mistakes. We may change features; if a change seriously reduces what you pay for, we tell you first and you can cancel and get back the unused part of your fee.
You can close your coach account at any time. We can suspend or end it if you seriously break these terms or the law; we tell you first and say why, unless the law or someone’s safety needs us to act at once. Otherwise we can end these terms on 60 days’ notice.
For 30 days after your account ends we export your clients’ records for you on request. We then delete them from the service, and backup copies are gone within 14 days. Before your account ends, you must tell your clients. We delete a client’s account with them unless the client asks to keep using Stack and we can offer it.
You will compensate us for claims made against us by your clients or by others, and for regulators’ fines to the extent the law allows, where they are caused by your coaching, your content, your lack of a lawful basis or consent, or your breach of these terms, including reasonable legal costs. We tell you of a claim promptly.
Neither of us limits responsibility for harm caused on purpose or by gross negligence, for death or injury, or where the law doesn’t allow a limit. What either of us owes a data subject or a regulator directly is not limited. Between us, responsibility under data protection law and the data processing agreement is limited to three times the fees you paid in the 12 months before the claim, or 5,000 euros if that is more. We compensate you for claims caused by our breach of the data processing agreement, on the same terms. Beyond that, neither of us is responsible for loss of profit, revenue or goodwill, or for indirect loss, and our total responsibility in any 12 months, under these terms and the data processing agreement together, is the fees you paid us in those 12 months, or 500 euros if that is more. Neither of us is responsible for failures outside our reasonable control. We can suspend your account for unpaid fees after 14 days’ notice. We may transfer these terms to a buyer of Stack. If part of these terms is invalid, the rest stands, and these terms and the data processing agreement are the whole agreement between us. Stack is provided for business use: consumer protection rules don’t apply to this agreement, as far as the law allows.
When these terms change, the date at the top changes. If a change matters to you, we tell you by email at least 30 days before it applies, and you can close your account if you don’t agree.
Estonian law applies to these terms, and Harju County Court in Tallinn decides disputes under them, though we may also claim unpaid fees where you are based. You confirm you use Stack as a business, not as a consumer. Write to us first and we’ll try to put it right.