Terms of Service

The rules, in plain words.

Last updated: October 2026

1. Who we are and who these terms are for

Kesru is a service of Umbolement UG (haftungsbeschränkt), Ulmenweg 10, 85221 Dachau, Germany (“we”). Kesru is offered to businesses only, not to consumers. By creating a receptionist or subscribing, you confirm that you act for a business and accept these terms on its behalf.

2. The service

Kesru provides an AI receptionist that answers phone calls forwarded to a number we provide, using the information and settings you give us, and sends you summaries and transcripts. Answers are generated by AI and can occasionally be wrong or incomplete; please review what your receptionist knows and keep it up to date.

3. Free trial

The free trial starts when you add a payment card and ends after 14 days or 50 minutes of calls, whichever comes first. Nothing is charged before then. Unless you cancel before the trial ends, your chosen plan starts automatically and renews every month or year until you cancel: the first payment is taken when the trial ends or when you use the 50 trial minutes. Stripe shows the plan, the price and the trial end before you confirm, and you can cancel at any time in your dashboard under billing; cancelling during the trial means nothing is charged. If a payment fails, we ask you to update your card, and your receptionist may stop answering until it is paid.

4. Plans, fees and payment

  1. Fees follow the plan you choose as shown on our pricing page at the time of purchase. Prices are in USD and exclude taxes where applicable.
  2. Plans are billed in advance, monthly or yearly. Monthly plans include the stated monthly minutes; annual plans include twelve times that amount pooled across the year. Minutes beyond your plan are billed at your plan's rate for the past billing period. Each connected call is rounded up to the next full minute.
  3. We may change prices with at least 30 days' notice by email. Changes apply from your next billing period; you can cancel before they take effect.

5. Term and cancellation

Monthly plans run month to month and yearly plans for one year; both renew automatically. You can cancel anytime, effective at the end of the current billing period. Fees already paid are not refunded, except where the law requires it. We may suspend or end the service for serious or repeated breaches of these terms.

6. Your responsibilities

  1. You use Kesru lawfully and only for your own business. You are responsible for complying with the laws that apply to your calls, including rules on call recording and transcription notices, privacy and consumer protection.
  2. You do not use Kesru to deceive callers, to impersonate others, or for unsolicited marketing calls.
  3. You only upload content you are allowed to use, and no malicious files.
  4. You keep your account link and settings confidential.

Use of Supertonic voices

When you select Ava or Noah (Supertonic 3), your use of these voices through Kesru must comply with paragraph 5 and all use restrictions in Attachment A of the BigScience Open RAIL-M license supplied with the model. These restrictions are incorporated into these terms as binding conditions for using these voices. You must keep the intelligible AI disclosure, must not use the voices for prohibited impersonation or harmful content, and must not use them for medical advice or prohibited automated decisions. The full Attachment A governs all restricted uses. We may suspend use that breaches these conditions. Voice sources, attribution and full license copies.

7. Emergencies

Kesru is not an emergency service and does not replace 911. It can forward urgent calls to a number you choose, but we cannot guarantee that every call is connected or understood.

8. Your data and your callers' data

You own your content. For calls to your business, you are responsible for your callers' personal data and we process it on your behalf, as described in our privacy notice. Our Data Processing Agreement is part of these terms and applies automatically; you accept it when you create your account. We do not keep audio recordings and delete transcripts after 90 days. Once an account has ended and its phone line has been released, account content is scheduled for deletion after 30 days, during the next periodic cleanup. Payment and invoice references required for accounting are retained. Cases where the end date cannot be verified need manual review.

9. Availability

We work to keep Kesru available around the clock but cannot promise uninterrupted service. Maintenance and outages of phone networks or providers can affect calls.

10. Liability

We are fully liable for intent and gross negligence, for injury to life, body or health, and under mandatory product liability law. For slight negligence we are liable only for breaches of essential contractual obligations and limited to damage typical and foreseeable for this kind of contract. In any case our total liability per contract year is limited to the fees you paid in the previous twelve months, to the extent permitted by law. We are not liable for lost profits or for content generated from information you provided.

11. Changes to these terms

We may update these terms with at least 30 days' notice by email. If you don't object within that period, the new terms apply; we will point this out in the notice.

12. Law and venue

German law applies, excluding the UN Convention on Contracts for the International Sale of Goods. Venue is Munich, Germany, to the extent permitted by law.

Contact

support@kesru.com