1. Who you are contracting with
Twilper.com, Merelstraat, The Netherlands. Chamber of Commerce 98440217, VAT NL005332508B94. Trading as AI Master Songs at aimastersongs.com. Dutch law applies and Dutch courts have jurisdiction, which does not take away the consumer protections of the country you live in.
2. What you are buying
Processing. You send us audio, the tool measures it, masters it and hands back files and a report. That is the entire product. We are not selling a result, a chart position or a promise about how your music will be received.
- Single track, $2 per track: No account. Pay for one track, download it, leave.
- Unlimited, $12 per month: No limit, plus the parts that only matter once you release regularly.
- Free: 3 masters a month including the WAV download and the full report. The free tier is a real tier, not a trial, and the paid tiers buy volume and workflow rather than better audio.
Prices are in US dollars and exclude VAT. Consumers in the European Union are charged Dutch VAT at 21% on top of the listed price: we are a Dutch business below the €10,000 threshold for cross-border sales inside the EU, so the rate is ours and not yours. A business with a valid EU VAT number pays no VAT here and accounts for it under the reverse charge; there is a field for that number at checkout. Outside the EU no VAT is added.
A subscription runs month to month and you can cancel at any time, effective at the end of the period you have paid for. We do not bill for a period you cancelled before it started.
3. Your music stays yours
We claim no ownership, no licence and no rights of any kind over the audio you upload or over the master we return. We do not use it to train anything, we do not use it in marketing, and we do not use it as an example without asking you first and in writing. What we do with the file technically is described on the privacy page, down to which button deletes what and when.
What you promise in return is narrow: that you have the right to upload what you upload. If you send us a track you do not hold the rights to, that is between you and whoever does.
4. Refunds
Within 14 days of paying, ask and you get your money back. No reason needed, and it applies even though the service is digital and you have already used it. That is deliberately more generous than the law requires: EU rules let a seller kill the withdrawal right for digital content once delivery has started, and we do not invoke that.
One limit, and it is about scale rather than judgement: on the unlimited plan, a refund covers the current period, not every period you have been subscribed for.
5. What we do not guarantee
The tool measures what it measures and reports it. It does not guarantee that a platform will accept your upload, that a distributor will approve it, that a platform's encoder behaves the same way next month as it did when we measured it, or that you will like the result. Several of the loudness targets we master against are industry consensus rather than figures the platform publishes; the platform targets page marks exactly which ones, and that uncertainty is real rather than a formality.
Uptime is not guaranteed either. This is a small operation and there is no support contract behind it. If you have a deadline, do not make it depend on us.
6. Liability
Our total liability to you, for anything arising out of this service, is limited to the amount you paid us in the twelve months before the claim. If you used the free tier, that amount is zero. We are not liable for lost revenue, lost streams, lost opportunities or any other indirect loss.
Two things this limit does not cover, because they cannot be limited away: damage caused intentionally or by gross negligence on our part, and any liability that Dutch law does not permit us to exclude.
Keep your own copy of your source files. We are not a backup service and the privacy page explains why you should not treat us as one.
7. Acceptable use
Do not upload material you have no right to. Do not try to break the service, scrape it, or resell access to it as if it were yours. We can refuse or stop service if you do, and on a paid plan you get the unused part of the period back.
8. Changes
If these terms change in a way that matters, subscribers are told before it takes effect and can cancel. A changed price never applies to a period already paid for. This page carries the date it was last changed, so a silent edit is visible.
Last changed 2026-08-10. The version before this one said these terms described a service that was not running yet. It is running: the free tier works without an account and a paid track goes through Stripe, so the sections about refunds and billing are live and describe a checkout that exists. Questions go to the address on the Chamber of Commerce registration above; this page prints no mailbox until there is one that actually receives.