Who this is between
These terms are between you and the company operating Euphona (SOGV2 Limited (CR No. 76825703)), a company incorporated in Hong Kong.
“You” means the person using the service, and where you use it on behalf of an organisation, that organisation as well. If you are agreeing on behalf of an organisation, you are confirming you are allowed to.
What the service is
Euphona processes audio you give it: mixing, mastering, stem separation, restoration, vocal tuning and spatial audio, through the Studio at app.euphonaai.com, through the API at api.euphonaai.com, and through the free tools on this site.
Capabilities become available as they are finished. A capability that is not on the site is not part of what you are buying, and nothing here should be read as a commitment to ship one by a particular date.
Two of the free tools on this site — the loudness checker and the BPM & key finder — are different from the rest: they run entirely in your browser. Nothing is uploaded, so most of what follows about your audio simply does not apply to them — there is no copy of your file for us to hold, use or lose.
The vocal remover is not one of those, and its page says so before you choose a file. It uploads your track to our servers, because the separation runs on the engine, and it deletes the upload and both parts within twenty-four hours unless you sign up and keep the result. For as long as we hold that upload, everything here about your audio — your rights in it, our limits on what we do with it, and the warranty you give us about it — applies to it exactly as it applies to a file in the Studio. Hearing the result is free; the full-resolution files are a per-track purchase under the paying section, and the price is on the button before you buy.
Accounts and workspaces
- You need an account to process audio on our machines. Give accurate information and keep your credentials to yourself; you are responsible for what happens under your account.
- Every account gets a personal workspace. Audio, projects, plans and billing all attach to a workspace rather than to a person, so a workspace can gain and lose members without anything moving.
- Email verification is required before your first processing job. Browsing the Studio before that is fine.
- You must be 16 or older. One number rather than a different one per country, and it is the higher of the ones that apply, because the alternative is asking your age and your address and then treating you differently on the answer. If you are younger, the privacy policy says what happens and how a parent reaches us — and the free tools need no account and no age at all.
- API keys belong to the workspace, not the person who created them. Treat a live key as a credential: anyone holding it can spend your money.
Your audio
What you upload stays yours. You keep every right you had in it. We do not acquire ownership of your recordings, your masters, your stems, or anything the engine produces from them — the outputs are yours as well.
You give us the narrow permission we need to do the work you asked for: to store your files, decode them, analyse them, process them, and deliver the results back to you. That permission exists to run the service and for nothing else, and it ends when you delete the material or close the account.
We do not train on your audio. Not now, and not later without asking you first, separately, in a way you can decline and reverse. There is no consent buried in this agreement, because burying it here is precisely how that promise usually gets broken.
Our staff cannot listen to your audio as a matter of course — that is an access control, not a policy — and internal access is recorded. Where a support case genuinely requires someone to hear a file, we ask you first.
What you promise about it
You warrant that you have the rights necessary to process the audio you submit, including any rights belonging to performers, writers, rights-holders and, where a voice is identifiable, the person it belongs to.
This is the one promise we cannot verify and cannot carry for you. We have no way of knowing whether the file you uploaded is yours, and processing something does not create rights in the result. If a claim is made about material you submitted, the acceptable use policy sets out what happens next.
What stays ours
The software, the models, the processing chains, the analysis, the interface and the name remain ours. You get a licence to use the service, not to the machinery behind it.
You may not reverse-engineer the service, attempt to extract the models or their parameters, or use outputs to train a competing system. Ordinary use of what you paid for — including using your finished masters commercially, without restriction or attribution — is not what that clause is about.
Acceptable use
The acceptable use policy is part of these terms and applies identically to the Studio, the API and the free tools. It is a separate document because it is the one people actually need to read, and burying it in clause nineteen of an agreement is how you make sure they do not.
Paying
- Before we ask for a card you are shown, on the same screen and without having to open anything, what the plan costs, what it includes, that it renews automatically until you cancel, how often it renews, and how to cancel. Nothing is charged until you have agreed to that specifically — not as a consequence of agreeing to these terms, and never as a pre-ticked box. This is what US federal law requires of any subscription, and it is also just the honest way to sell one.
- Plans are billed monthly or annually in advance and renew until you cancel. Cancellation is self-serve, takes the same number of clicks as subscribing did, takes effect at the end of the period you have paid for, and does not claw back anything you have already used. We will never route a cancellation through a phone call, a chat agent or a retention offer you have to decline twice.
- Annual plans get a reminder by email before they renew, with the date and the amount, in time to do something about it, wherever the law requires one — and our current practice is to send it on every annual plan regardless of where you live.
- Overage is off unless you turn it on, and when you do, you set the monthly ceiling. Nothing bills silently. A job that would exceed your remaining minutes cannot be submitted at all — you are told the exact shortfall instead.
- Minute packs are one-time purchases. They expire twelve months after purchase, which is stated on the purchase screen with the date, and we currently also warn you by email before a pack lapses. Packs are not refundable once purchased, except where the law gives you a right that cannot be excluded.
- Per-track purchases are quoted in full before you buy — the price is on the button. Re-downloading a version you have already bought is free, because it is your file. A refund is not offered on a delivered file except where delivery failed or the result was defective through our fault, in which case it is remedied.
- API usage is metered separately from plan minutes and billed monthly. Spend caps are on by default and can be raised.
- Refunds are set out at Refunds below. In short: payments are final — and you hear the result before you pay for it.
- Prices are in US dollars and exclude tax where it applies; the amount is calculated at checkout. We may change them — but never for a period you have already paid for, and never on a renewal without at least thirty days’ notice by email, stating the old price, the new one and the date. A price rise you find out about from your bank statement is a price rise we got wrong.
Refunds
Payments are final. Subscriptions, minute packs and per-track purchases are not refundable once the period has begun, the minutes have been spent or the file has been downloaded. This is the ordinary rule for digital work: what you bought cannot be handed back.
- Nothing is bought unheard. The level-matched comparison against your original plays before you pay, and the exact price is on the button. You decide with your ears first, which is why the answer afterwards can be no.
- Cancelling stops the next charge and leaves you the period you have paid for. We do not refund the remainder of a period you are still using.
- A charge you did not authorise — a renewal after you cancelled, a price you did not agree to — is reversed. That is our error, not a refund request.
If the result is defective — a file that will not play, an export at the wrong sample rate, a job that reported success and produced nothing — tell us and we will reprocess or refund it, as the consumer law that applies to you requires. That is us failing to deliver what you paid for. Not liking the result is not a defect, and we will say so.
Ask at support@euphonaai.com. Please ask us before asking your bank: a chargeback costs you the account while it is investigated, and in most cases we would have sorted it out.
If you are in the EU or the UK, you have fourteen days to withdraw from a distance purchase. For a file you asked to download immediately, that right ends when the download starts — you are told so and have to agree at the download button, not by reference to this page. For a subscription it cannot be waived: cancel within fourteen days and you are refunded pro rata for what you did not use. A defective result is refundable regardless of either.
If you build on the API
You are contracting as a business, so the consumer protections above do not apply to API use, and the balance here is negotiated rather than statutory.
- Keys are credentials. Anything done with one is treated as done by you. Never put one in a browser, a mobile binary or a public repository. Tell us at security@euphonaai.com if one leaks and we revoke it immediately, no charge.
- You warrant the rights to every recording you send, including your own users’, and indemnify us against claims arising from audio you had no right to send. We cannot check it and do not pretend to.
- Your users are yours. We will not contact them, support them, or action a data request from them directly — except a rights complaint, which we act on and tell you about.
- You are the controller, we are the processor for audio your users send. The data processing agreement covers that and applies without separate signature.
- Rate limits and spend caps are published and enforced, and caps are on by default. Working around them is a breach rather than a clever solution.
- The contract is versioned and additive. Within a version we add fields, never remove or repurpose them. A breaking change means a new version, announced ahead.
- No service level yet. Build accordingly — retry, queue, and do not put a synchronous dependency on us in front of your user without a fallback.
The free plan
The free plan runs every capability at full quality on your own music. Two things about it are worth stating here as clearly as they are stated at signup, because both are the kind of term people usually discover at the worst moment:
- It never delivers a file. Playback is preview quality and there are no downloads or exports at any resolution. Getting a file out means buying that track, buying a pack, or subscribing.
- Its processing minutes are granted once for the life of the workspace. They do not expire and they do not refill. Creating additional accounts to obtain more of them is a breach of the acceptable use policy.
Analysis is never metered on any plan, so a workspace that has used its allowance can still upload a track and see what the engine makes of it.
AI-generated audio and the law
The EU’s AI Act has applied transparency rules to AI-generated audio since 2 August 2026. Two obligations in it touch what happens here, and they land on different people.
Ours. A provider of a system that generates synthetic audio has to mark its output so that it is machine-readable and detectable as artificially generated or manipulated. The Act exempts systems performing “an assistive function for standard editing” or which “do not substantially alter the input data” — which is a description most of this chain fits, since mastering, restoration and mixing process a recording you made rather than synthesise one. Where a capability falls on the other side of that line, its output carries the marking. We are not going to tell you which capabilities we think are exempt before our counsel has ruled on it, and we will state the position plainly here once they have.
Yours. If you use this to generate or manipulate audio that constitutes a deep fake — most obviously, making a real and identifiable person appear to say or sing something they did not — the Act requires you to disclose that the content is artificially generated, clearly, at the point someone first encounters it. That duty is on the person publishing, and no setting here discharges it. Our acceptable use policy prohibits that use of the vocal tools regardless of what any regulation requires.
None of this changes the ordinary case. A master, a cleaned-up take or a set of stems from your own recording is your work, and nothing about these rules asks you to label your record as an AI product.
Availability
We aim to keep the service running and we do not currently offer a service-level agreement. That is deliberate rather than evasive: a service level is a promise about measured behaviour, and we have not yet measured ours over a long enough period to make one honestly. When we have, the terms will say so with the data behind them, and enterprise agreements can carry a contractual level.
Processing is queued work, not instant work. Jobs are prioritised by plan, and a job that fails because of a fault on our side is not charged.
Suspension and termination
You can close your account whenever you like, export your material first, and we will delete it — subject only to copies in encrypted backups, which are overwritten within 14 days. A restore never puts deleted material back into a live account.
We may suspend processing or terminate an account for breach of these terms or the acceptable use policy, following the ladder set out there: warning first, suspension of processing next, termination last, except where the law or an imminent harm requires us to act immediately.
A free workspace that has been inactive for more than ninety days may have its stored source files reclaimed, after three emails over a thirty-day period. We do not reclaim paid workspaces. A downgrade does not delete what you have stored: material outside your new plan's limits becomes read-only until you delete it or upgrade.
Warranties and liability
The service is provided as it is. We do not warrant that processing will produce a particular artistic result — it is a tool, and taste is not a specification. We do warrant that we will not misuse your audio, and that warranty is the one we consider load-bearing.
To the extent the law allows, our liability to you is limited to what you paid us in the twelve months before the claim. Nothing here limits liability that cannot lawfully be limited — including for death or personal injury caused by negligence, or for fraud.
Keep your own copies of anything you cannot afford to lose. That is true of every service and it is more honest to say it than to imply otherwise.
Changes to these terms
We will update these terms as the service changes. Material changes are notified by email before they take effect, with enough notice to leave if you disagree, and the date at the top of this page always reflects the current version. Changes never apply retroactively to a period you have already paid for.
The ordinary clauses
Every agreement carries a handful of terms that only matter once something has already gone wrong. They are usually in an annex nobody opens. They are here, in the same language as the rest, because a clause you have to hunt for is a clause we would rather you did not read.
- What the agreement actually is. This document, plus the ones it names: the acceptable use policy, the privacy policy, the copyright and voice procedure, the AI transparency notice, and — if you send us your own users’ audio through the API — the data processing agreement. Nothing said in a sales conversation, a blog post or a marketing page adds to it. Where the data processing agreement and this document disagree about personal data, that one wins; where a separate agreement we have signed with you says it overrides this one, it does.
- If a clause turns out to be unenforceable, it is cut back to the least extent that makes it work, or struck out if it cannot be, and everything else stands. One bad clause does not void the agreement in either direction.
- Letting something go once is not giving it up. If we do not enforce a term, or are slow about it, we have not waived it and we have not agreed to the next one. The same applies to you.
- You cannot hand this agreement to someone else without our written consent. We may transfer it if the business is merged, acquired or sold — but only on terms that do not reduce your rights, and we will tell you when it happens rather than let you find out from a new name on an invoice.
- Nobody outside this agreement can enforce it. Under the Contracts (Rights of Third Parties) Ordinance, a person who is not you or us has no right to enforce any of it — which does not touch any right or remedy that exists apart from this contract.
- Notices. We write to the email address on your account, and it counts as given when we send it — so keep it current, because a notice about a renewal or a price change is worth nothing sent to an address you abandoned. You write to legal@euphonaai.com, and a person reads it.
- Things genuinely outside anyone’s control — a data-centre fire, a war, a state cutting off a network, a failure of infrastructure we do not run — suspend our obligations for as long as they last, and neither of us is liable for the delay. This does not let us keep your money. If we cannot deliver what you paid for, you get it back, whatever the cause; a force-majeure clause that quietly converts an outage into a free month is the version of this term worth being suspicious of, and it is not this one.
- What outlives the agreement. When it ends — however it ends — these survive: what you promised about the rights in your audio, the indemnity if you are a business customer, what stays ours, the limits on liability, and anything else that by its nature has to. Your right to get your files out survives too.
Governing law, and what it does not override
Euphona is operated from Hong Kong, and these terms are governed by Hong Kong law.
If you are a consumer in the United States, that sentence does not take anything away from you. The consumer-protection law of the state you live in applies to you whatever a contract says, and we are not asking you to give up rights we could not lawfully take. Where your state’s law gives you something these terms do not — a cancellation right, a refund right, a warranty, a limit on what we can disclaim — your state’s law wins and this clause does not touch it. The same goes for consumers anywhere else with equivalent protections.
The same is true of every other mandatory protection you have. Rights to cancel or withdraw, to a refund, to a remedy for digital content that does not work, to protection from unfair contract terms, to a statutory warranty — where the law gives you one that cannot be signed away, nothing in this agreement signs it away, and where it gives you more than we have written here, you get the more generous of the two. That is not generosity on our part. It is what the law already does, and saying so is the difference between a document you can rely on and one you would have to litigate to understand.
If something goes wrong, tell us first. Write to legal@euphonaai.com and we will try to sort it out directly — not as a hoop you have to jump through before you are allowed to complain properly, but because most disputes are a misunderstanding and both of us would rather spend an email than a year.
If that fails. If you are a consumer, you keep every court and every complaints body your own law gives you access to, including the ones in the country you live in, and nothing here requires you to travel to Hong Kong to be heard. If you are a business — using the API, or buying on behalf of a company — the courts of Hong Kong have exclusive jurisdiction, unless we have signed something with you that says otherwise.
Questions about any of this go to legal@euphonaai.com. Questions about your data go to privacy@euphonaai.com.