Terms of use

The sections that carry real consequences open with a plain-language summary in italics. Two are worth reading in full even if you read nothing else: the apps are tools, not advice and what we are and are not responsible for.

Who can use ZipSync

You may use ZipSync if you are old enough to form a binding contract where you live, and you are not barred from doing so under any applicable law. If you are under that age, you may use the apps only with the involvement of a parent or guardian, who accepts these terms on your behalf.

The waitlist on this website is limited to people aged 16 or over. We ask you to confirm this before you submit an email address, and we do not knowingly add anyone younger to it.

Your licence to use the apps

In short: you get a personal licence to use the apps; you don't get to resell or reverse-engineer them.

We grant you a personal, non-exclusive, non-transferable, revocable licence to install and use the ZipSync apps on devices you own or control, for your own personal or internal business use, in accordance with the usage rules of the app store you downloaded them from. We keep all other rights.

You agree not to:

• copy, sell, rent, sub-licence, lease or redistribute the apps, or make them available over a network where others could use them;
• reverse-engineer, decompile or disassemble the apps, or attempt to derive their source code, except to the extent that applicable law expressly permits it despite this restriction;
• remove or obscure any copyright, trade mark or other proprietary notice;
• use the apps to break the law, to infringe anyone's rights, or to build a competing product from their content or output; or
• interfere with the apps' security features, or use automated means to overload or disrupt any service we run.

The apps are tools, not advice

In short: ZipSync is a calculator. Check anything that matters before you rely on it.

ZipSync performs calculations — including loan payments, compound interest, APR to APY conversions, wage and salary projections, fuel and running costs, currency conversion, kitchen measurements and construction quantities such as concrete volume, board feet and paint coverage. These are calculators. They are not financial, investment, tax, accounting, legal, medical, nutritional, dietary, safety or engineering advice, and they are not a substitute for a qualified professional.

We work hard to make the maths correct, and every worked example on this website is checked arithmetic. Even so, we do not warrant that every result is accurate, complete, current or suitable for your situation. Results depend on the figures you enter, on assumptions built into each tool, and — for currency — on exchange-rate data supplied by third parties which may be delayed, cached on your device, or wrong.

You use ZipSync, and act on what it tells you, at your own discretion and risk. Always verify anything that matters independently — in particular before making a financial commitment, signing a loan or credit agreement, ordering materials, cutting anything to size, converting a dosage or measurement where an error could cause harm, or relying on a currency conversion for a transaction. If the numbers matter, check them.

Exchange rates and other third-party data

Currency conversion uses exchange-rate data obtained from third-party sources and cached on your device so it keeps working offline. Rates are indicative only. They are not a quote, they are not a dealing rate, and the rate you actually receive from a bank, card issuer or bureau will differ. We do not control this data and are not responsible for its accuracy or availability.

Purchases, Premium and refunds

In short: you buy from Apple or Google, not from us, and refunds go through them.

ZipSync is free to download. ZipSync Premium is a one-time purchase, not a subscription. It removes ads and unlocks the Pro tools described in the app and on this site.

Purchases are made through the Apple App Store or Google Play, and your purchase contract for that transaction is with the store, not with us. Billing, payment methods, taxes, receipts, and refunds are handled by the store under its own terms. If you want a refund, request it from Apple or Google. We cannot issue, force or reverse a store refund, and we are not able to see your payment details at any point.

Premium is tied to your store account, follows you to new devices signed in to that account, and can be restored with the Restore Purchase option in the app. If you have statutory cancellation or withdrawal rights where you live, those rights are unaffected by this section — see rights where you live.

We may change what Premium includes, add tools, or retire tools that we can no longer support. Where a change materially reduces what you have already paid for, we will tell you in the app before it takes effect.

Advertising

The free version of ZipSync is supported by advertising served through Google AdMob. We do not control which specific ads are shown. Ads are non-personalised for users who tell us they are under 16, and where required we ask for your consent choice before any personalised advertising is served. What data the ad network collects is set out in the privacy policy.

Ask AI and your own API key

In short: you bring your own key, your questions go straight to the provider you chose, and AI output can be wrong.

Ask AI is free and is never locked behind Premium. It works by using an API key that you obtain yourself from OpenAI, Anthropic or Google. The key is stored encrypted on your device.

• When you use Ask AI, your question is sent from your device directly to the provider whose key you supplied. It does not pass through us, and we never receive or store your questions, the answers, or your key.
• Your use of that provider is governed by that provider's own terms and privacy policy, which you accept when you obtain a key. Any charges the provider makes for your usage are between you and them.
• AI output can be confidently wrong. It may be inaccurate, incomplete, out of date or fabricated. Treat it as a starting point, never as a fact, and never as advice. The tools, not advice section applies to it in full.
• Keep your key secure. You are responsible for usage on your own key, including usage that follows from you losing control of your device.

ZipSync Challenge Hub

ZipSync Challenge Hub is in development and is not yet released. Anything said about it on this site describes what is planned and is not a commitment to release, to a date, or to a particular feature. Separate terms will apply to it when it launches, and you will be asked to accept them then.

Joining the waitlist creates no obligation on either side. It means we will email you at launch and, because you asked us to, about new ZipSync releases, updates and occasional offers. Every email carries a one-click unsubscribe link, and you can withdraw at any time.

Acceptable use of this website

When using this website and its forms, you agree not to:

• submit anyone else's email address, or an address you are not entitled to use;
• submit unlawful, abusive, defamatory or deliberately misleading content;
• attempt to probe, scan or breach the security of the site or its API, or to circumvent rate limiting, verification or any other control; or
• use automated means to submit forms, scrape at a rate that burdens the service, or attempt to disrupt it for others.

We may block access, remove submissions, and where appropriate report conduct to the relevant authorities.

Our intellectual property

The ZipSync name, logos, app icons, artwork, interface design, text and the compilation of everything in the apps and on this site are owned by us or licensed to us, and are protected by copyright, trade mark and other laws. These terms give you a licence to use the apps and site; they transfer nothing else to you.

Results you generate — a conversion, a payment figure, a total — are yours to use freely. We claim nothing in them.

Third-party services and links

The apps and site rely on and link to services we do not operate, including the Apple App Store, Google Play, Google AdMob, Google Firebase, Google reCAPTCHA, exchange-rate data providers, and any AI provider whose key you choose to use. We do not control them, we are not responsible for their content, availability, security or practices, and their own terms and privacy policies apply to your use of them.

Availability, changes and “as is”

In short: we do our best, but nothing is guaranteed to work perfectly or forever.

To the fullest extent permitted by law, and subject to the rights described in rights where you live, the apps and this website are provided “as is” and “as available”, without warranties of any kind, whether express, implied or statutory. This includes, but is not limited to, implied warranties of merchantability, satisfactory quality, fitness for a particular purpose, accuracy, and non-infringement.

We do not warrant that the apps or site will be uninterrupted, timely, secure, error-free, free of harmful components, compatible with your device, or that defects will be corrected. We may change, suspend, limit or discontinue any part of them, including individual tools, at any time.

What we are and are not responsible for

In short: you use ZipSync at your own risk, and our responsibility is limited as far as the law allows — but some things can never be excluded, and we do not try to.

What cannot be excluded, and is not

Nothing in these terms excludes or limits our liability for:

• death or personal injury caused by our negligence;
• fraud or fraudulent misrepresentation;
• any other liability that the law of the country you live in does not allow to be excluded or limited.

We state this first because it is true and because a clause that pretended otherwise would risk being unenforceable in full, taking the rest of this section with it.

What is excluded, so far as the law allows

Subject to the paragraph above, and to the fullest extent permitted by applicable law, we will not be liable to you for:

• any loss arising from a calculation, conversion, estimate or result produced by the apps — including a financial loss, a loan or credit decision, a mispriced purchase, a wasted or wrongly ordered material, a ruined recipe, a missed meeting, or a measurement that turned out to be wrong;
• any loss arising from exchange-rate data being delayed, cached, unavailable or inaccurate;
• any loss arising from output produced by an AI provider through Ask AI, or from your use of your own API key;
• indirect, incidental, special, consequential, exemplary or punitive loss;
• loss of profit, revenue, business, contracts, anticipated savings, goodwill or reputation, whether direct or indirect;
• loss or corruption of data, including history and saved items held on your device; or
• any loss caused by a third-party service, your device, your network, or your failure to keep your device or API key secure.

Where liability cannot lawfully be excluded but can be limited, our total liability to you for all claims connected with the apps and this site, taken together, is limited to the greater of the amount you actually paid us for the app in the twelve months before the claim arose, or ten pounds sterling (£10). ZipSync is free to download, and where you have paid nothing, that figure is the £10.

This limit reflects what the product is: a free or low-cost utility, supplied to a very large number of people, whose output you are expected to check before relying on it. We say this openly rather than burying it, because a limit a court considers a surprise is a limit a court is more willing to set aside.

Your responsibility to us

If you use ZipSync in a way these terms prohibit, and that causes a third-party claim against us, you agree to be responsible for the reasonable losses, costs and legal fees we incur as a result. This does not apply to anything caused by us, and — if you are a consumer — it does not extend beyond what the law where you live allows.

Ending this agreement

You can end it at any time by deleting the apps and stopping use of the site. Uninstalling deletes the data held on your device. We may suspend or end your access if you materially breach these terms, or if we are required to by law.

The sections that by their nature should survive — intellectual property, disclaimers, limitation of liability, governing law — do survive.

Changes to these terms

We may update these terms as the apps change or the law does. The “last updated” date at the top always reflects the current version. Where a change materially affects your rights, we will give reasonable notice in the app or on this site before it takes effect. Continuing to use ZipSync after that means you accept the updated terms; if you do not, you can stop using it, which is your remedy for a change you do not agree with.

Terms required by Apple

In short: Apple sells you the app but is not otherwise involved, and can enforce these terms.

These terms apply to you and to us only. Apple is not a party to them. Apple is not responsible for the apps or their content. If you obtained ZipSync from the App Store, you also agree that:

• Apple has no obligation whatsoever to provide maintenance or support for the apps;
• if the app fails to conform to any applicable warranty, you may notify Apple, and Apple will refund the purchase price to you; to the maximum extent permitted by law, Apple has no other warranty obligation at all with respect to the app;
• we, not Apple, are responsible for addressing any claim by you or a third party relating to the app, including product liability claims, any claim that the app fails to conform to a legal requirement, and claims under consumer protection or similar legislation;
• we, not Apple, are responsible for the investigation, defence, settlement and discharge of any third-party claim that the app infringes that party's intellectual property rights;
• you represent that you are not located in a country subject to a US Government embargo or designated as a “terrorist supporting” country, and are not on any US Government list of prohibited or restricted parties; and
• Apple and its subsidiaries are third-party beneficiaries of these terms and, on your acceptance, have the right to enforce them against you.

Governing law

These terms, and any dispute arising out of them or out of your use of ZipSync, are governed by the laws of the State of California, United States. You and we agree that the state and federal courts located in California have jurisdiction, except that if you are a consumer, you may also bring proceedings in the courts of the country where you live, and you keep the protection of the mandatory consumer laws of that country.

Nothing in these terms limits or removes any right you have under the law of the country you live in that cannot be limited or removed by agreement. Where those laws give you rights that conflict with these terms, those rights apply and these terms give way to them, only so far as the conflict goes.

If any part of these terms is found to be unenforceable, the rest continues to apply, and the unenforceable part is treated as modified to the minimum extent needed to make it enforceable.

Rights where you live

In short: your local consumer law wins, and here is what it typically gives you.

ZipSync is distributed in the United States. Because consumer protection applies according to where you live rather than what a contract says, the section below sets out rights that the limitations above do not and cannot take away. If your country is not listed, the governing law section still preserves your local mandatory rights in full.

United States

Some states do not allow the exclusion of implied warranties or the limitation of incidental or consequential damages, so parts of the “as is” and liability sections may not apply to you. In that case those exclusions apply only to the extent your state allows, and you may have other rights that vary by state. Your state privacy rights are described in the privacy policy.

Contact

Questions about these terms go through the contact form, which is the channel we monitor. For anything about your data, see the privacy policy.

ZipSync, trading as ZipSync — zipsync.app