Terms of Use

1Agreement to these terms

These Terms of Use (“Terms”) are a legal agreement between you and Zydeno, the developer of Basswright (“we”, “us”). They apply to the Basswright app for Android, its updates and everything it shows or produces (together, “the app”). By installing, opening or using the app you accept these Terms. If you do not accept them, do not use the app and uninstall it.

The Privacy Policy explains how the app handles data and forms part of these Terms. If we offer optional features under additional terms in the future, for example paid features, those terms will be shown to you before you accept them and will apply together with these Terms.

You must be old enough to enter into a binding contract where you live, or use the app with the consent and supervision of a parent or guardian who accepts these Terms for you. If you use the app for an organisation, you confirm that you may accept these Terms on its behalf; the consumer-protection provisions of these Terms apply only to consumers.

2Who provides Basswright

Basswright is developed and published by Zydeno (“we”, “us”), an independent developer. Contact: support@zydeno.com, website zydeno.com.

The app is a general audio and DIY design tool. If you are under the age of majority where you live, use it only with the involvement of a parent or guardian.

3What Basswright is

Basswright is a design aid for loudspeaker enclosures. You enter the parameters of a driver and choose a box type (sealed, vented, fourth-order bandpass or passive radiator). The app calculates frequency response, cone excursion, port air speed, impedance, group delay and related curves, compares up to three variants, and works out internal volume, port dimensions and a list of panels for the material thickness you set. It lets you save projects and export them as PDF, CSV and data files. It works offline, has no ads and needs no account.

Free. No ads, no tracking, no account.

The current version of the app is provided at no charge and has no ads or in-app purchases. This describes the current version only; see §15 for how this may change.

4Results are estimates, not professional advice

The small-signal model treats the driver as a linear system with fixed parameters. It does not capture everything that happens in a real build: changes of the driver’s parameters with level, temperature, age and break-in; manufacturing tolerances; cone and suspension nonlinearity; heating of the voice coil; compression and noise in the port; cabinet panel and air resonances; leaks; the effect of the baffle shape; and the acoustics of the room or vehicle. Curves are shown for the conditions printed with them (for example amplifier power, load, listening distance, loss factors and radiation space), and they change when those conditions change.

Indicators for cone excursion, port air speed and power are guides to help you compare variants. They are not limits you can rely on, they do not promise that a port will be free of noise or that a driver will not be damaged, and a figure labelled “estimate, not a power rating” is not a power rating. Always follow the driver and amplifier makers’ own specifications.

The app is not engineering, acoustic-consulting, electrical, cabinet-making or other professional advice, and it does not replace the judgement of a trained person or a measurement of the finished system.

5Your responsibility

You are responsible for:

• entering driver parameters from a reliable source, in the units you selected, and understanding that errors or missing values in the input change the result;
• checking every dimension on the screen and in any PDF or CSV against your own drawing and the real materials before you make a cut: internal and external sizes, material thickness, panel overlaps, driver and port cut-outs, bracing, and the volume taken by the driver, port and braces;
• checking the port length and its end correction on a mock-up or by measurement where precision matters, since real tuning can differ from the calculation;
• choosing amplifier power, input level, filters and settings within the ratings of your drivers, amplifier and wiring;
• the decision to build and the cost of materials, time and any part that turns out wrong, including work done for customers or other people;
• keeping your own backups (see §10).

6Workshop and installation safety

Saws, routers and other tools can cause serious injury, and installing audio equipment in a vehicle or building involves electrical and mechanical risks. Follow the safety instructions of your tools, amplifier and vehicle, use the guards and protective equipment they require, and work only within your skill and training. Basswright does not teach safe tool use and gives no wiring or installation instructions. Its output is a convenience, not a safety system. Do not rely on the app, or look at your phone, while a tool is running or while you are driving. Building, lifting and installing enclosures is done entirely at your own risk.

7Sound level, hearing and equipment

The app itself does not play or generate sound, but the systems you design with it can be very loud. High sound levels can permanently damage hearing and can damage drivers, amplifiers and other equipment. Sound-pressure figures in the app are calculated estimates for stated conditions; they are not exposure measurements and they are not statements about what level is safe or unsafe for hearing. Protect your hearing, start at a low volume when you test a new build, and stay within the ratings of your equipment. You are responsible for the volume at which you play any system you build.

8Not professional advice; no safety-critical use

The app is a tool to help you plan and calculate. It does not give professional, engineering, legal or other expert advice, and using it does not create a professional relationship with us. You remain responsible for your inputs, for how you interpret the results and for what you decide to do.

Do not use the app as the only basis for a decision where an error could cause death, personal injury, damage to property or the environment, or legal or financial loss, and do not use it in a safety-critical system, in an emergency or to control equipment.

9Licence to use the app

Subject to these Terms, we grant you a limited, personal, revocable, non-exclusive, non-transferable and non-sublicensable licence to download, install and use the app on Android devices you own or control, for your own purposes (including your own projects, projects for customers and your own small business). The app is licensed to you, not sold.

Except where these Terms, an open-source licence or mandatory law allow it (for example decompiling for interoperability where the law permits), you may not: copy, modify, translate or create derivative works of the app; decompile, disassemble or reverse-engineer it; rent, lend, sell, sublicense, distribute or publish it, or make it available for use by others over a network; remove or change any copyright, trademark or legal notice; or get around any technical limit of the app, including any future purchase, licence or advertising mechanism.

Open-source components and fonts in the app are licensed under their own licences, listed in the app under About → Open-source licenses. Those licences prevail for those components, and nothing in these Terms limits the rights they give you.

10Your data and backups

Your projects, drivers and settings are stored only on your device. You own them. We do not have a copy and cannot recover them if you lose your phone, uninstall the app, clear its storage or use “Delete all data”. Use “Export data” in Settings to keep your own copy. See the Privacy Policy for details.

The designs you create, and the PDFs, CSV files and data files you export from your own input, are yours to use. We claim no rights in them.

11Fonts and open-source components

Basswright is built with open-source software and a font, shown in the app under About → Open-source licenses:

The font and libraries remain the property of their authors. Nothing in these Terms limits the rights those licences give you for those components. Basswright is an independent app. It is not affiliated with, sponsored by or endorsed by Google or the other authors named above.

12About the method and data

The calculations in Basswright are our own implementation of the small-signal Thiele–Small model and published loudspeaker design methods. The app contains no driver database, catalogues or product data from manufacturers or retailers. The example drivers in the app are made up for illustration; they are not taken from any datasheet and do not describe any real product. Any driver data you enter or import is yours and is your responsibility. Brand and product names that may appear elsewhere belong to their owners, and Basswright is not affiliated with any of them.

13Acceptable use

You agree not to:

• use the app in breach of any law or of other people’s rights;
• remove or hide legal notices or open-source attributions, or present the app’s output as a certified, engineered or professional service;
• copy, modify, redistribute, sell or reverse-engineer the app, except as allowed by law or by an open-source licence;
• use the app where a mistake could endanger life or safety without independent checks of your own.

14Intellectual property

The app, its design, text, icon and the name Basswright belong to the developer, except for the open-source components and font above, which belong to their owners. Other names are used only to describe things and belong to their respective owners.

15Price, payments, ads and future paid features

Current version. The current version of Basswright is provided free of charge, without ads and without in-app purchases or subscriptions. This describes the current version only. It is not a promise that the app, or any feature of it, will remain free of charge or free of ads.

Possible changes. We may at any time introduce advertising; offer paid features, in-app purchases, subscriptions or a paid edition; change which features are free; and set or change prices. Features that are free today may require payment in a future version. We will describe such changes in the store listing and release notes, and in the Privacy Policy where they affect data.

Purchases. Any purchase will be made through Google Play and processed by Google under the Google Play Terms of Service and its payment policies. Prices are shown in Google Play before you buy, including taxes where applicable. Subscriptions renew automatically until you cancel them in Google Play; cancelling stops future renewals. Refunds follow Google Play’s refund policies and your mandatory consumer rights, such as the right of withdrawal in the EU and the UK. Where you ask for immediate access to digital content during a withdrawal period, you may lose that right to the extent the law allows, and you will be asked to confirm this before you buy. You are charged only if you choose to buy something.

Ads. If the app shows ads, they are supplied by third parties. We are not responsible for the content of ads or for the products and services advertised, and any dealings with advertisers are between you and them.

Price changes. We may change prices for future purchases at any time. For an active subscription, we will announce a price increase as Google Play and the law require, and you can cancel before it applies.

16Disclaimer of warranties

To the maximum extent permitted by law, the app and everything it produces are provided “as is” and “as available”, without warranties of any kind, express or implied, including warranties of accuracy, correspondence between calculated and measured results, reliability, fitness for a particular purpose, merchantability and non-infringement. We do not warrant that the app is free of errors, that a design will perform as calculated, that printed or exported dimensions match your materials or your other software, or that the app will work on every device or Android version.

17Limitation of liability

To the maximum extent permitted by law, the developer is not liable for any indirect, incidental, special, consequential or punitive damages, or for damage to drivers, amplifiers, enclosures, vehicles or other equipment, hearing loss, the cost of wood, board or other material, spoiled stock, parts cut to the wrong size, labour, delays, loss of data, lost profits or business losses, arising from or related to the app, its output or decisions based on it, even if we were told such damage was possible. Where liability cannot be excluded, it is limited to the extent the law permits.

18Your rights as a consumer

If you use the app as a consumer, you benefit from the mandatory consumer-protection rules of the country where you live, and nothing in these Terms affects them. In particular:

• EU and EEA: your statutory rights, including those on the conformity of digital content and digital services under the national rules implementing Directive (EU) 2019/770 where they apply, and mandatory product-liability rules, remain unaffected.
• United Kingdom: your statutory rights, including under the Consumer Rights Act 2015, remain unaffected.
• Australia: our services come with guarantees that cannot be excluded under the Australian Consumer Law. Where the law allows us to limit our liability for failing to meet a consumer guarantee for services that are not of a kind ordinarily acquired for personal, domestic or household use, our liability is limited to supplying the services again or paying the cost of having them supplied again.
• New Zealand: if you acquire the app for business purposes, you agree that the Consumer Guarantees Act 1993 does not apply, to the extent the law permits.
• United States and Canada: some states and provinces do not allow the exclusion of implied warranties or the limitation of incidental or consequential damages, so some of the exclusions above may not apply to you. In Québec, the mandatory provisions of the Consumer Protection Act apply.

19Indemnity

To the extent permitted by law, you agree to indemnify and hold harmless the developer against claims, liabilities, damages, losses and reasonable costs, including reasonable legal fees, brought by third parties and arising out of (a) your builds, installations and use of audio equipment, (b) your breach of these Terms, (c) your violation of any law or of the rights of others, or (d) output of the app that you provide to another person, such as a client or employer. This does not apply to the extent a claim is caused by our own breach of these Terms or our negligence, or where local consumer law does not allow it.

20Changes, availability and termination

To the extent the law allows, we may change, update, add or remove features, change data sources, and suspend or discontinue the app, in whole or in part or in any country, at any time. We are not obliged to provide updates, maintenance or support, except where mandatory consumer law requires updates to keep the app in conformity.

You may stop using the app at any time by uninstalling it. Your licence ends automatically if you materially breach these Terms, and we may end or suspend it where the law requires. When it ends, you must stop using the app and uninstall it. Your data stays on your device under your control, so export what you need first.

Provisions that by their nature should continue after these Terms end continue to apply, including those on intellectual property, disclaimers, limitation of liability, indemnity, governing law and general provisions.

21Google Play

You obtain the app through Google Play. Your download, and any purchase you make, is also governed by the Google Play Terms of Service and Google’s policies. Where these Terms conflict with Google Play’s terms on the distribution, billing, refunds or licensing of apps obtained from Google Play, Google Play’s terms prevail to the extent of that conflict.

These Terms are between you and the developer only, not Google. Google is not responsible for the app or its content and has no obligation to provide maintenance or support for it. Android and Google Play are trademarks of Google LLC.

22Governing law and disputes

These Terms, and any dispute or claim arising out of or in connection with them or the app, including non-contractual disputes, are governed by the law of the country in which the developer is established, without regard to its conflict-of-laws rules. The United Nations Convention on Contracts for the International Sale of Goods does not apply.

The courts competent for the place where the developer is established have jurisdiction. If you are a consumer, you keep the protection of the mandatory provisions of the law of your country of residence, and you may bring proceedings in the courts of that country where that law allows it.

Before starting formal proceedings, please write to support@zydeno.com and give us at least 30 days to try to resolve the issue informally. This does not affect any time limit that applies to you by law or your right to use an alternative dispute-resolution body available to consumers in your country.

23General provisions

• Entire agreement. These Terms, the Privacy Policy and any additional terms you accept for optional features are the entire agreement between you and us about the app.
• Severability. If a provision is found invalid or unenforceable, it applies to the maximum extent permitted and the rest remains in effect.
• No waiver. Not enforcing a provision is not a waiver of the right to enforce it later.
• Assignment. You may not transfer your rights or obligations under these Terms. We may transfer ours, for example together with the app to another developer; where the law requires, this will not reduce your rights as a consumer.
• Events beyond our control. We are not responsible for failure or delay caused by events beyond our reasonable control, such as outages of networks, devices or third-party services, natural disasters or acts of authorities.
• Export and sanctions. You agree to use the app in compliance with applicable export-control and sanctions laws.
• No third-party rights. No one other than you and us may enforce these Terms.
• Notices. We may give notices in the app, in its store listing or release notes, or on this page. You can send notices to support@zydeno.com.
• Language. These Terms are written in English, which is the binding version. A translation, if offered, is for convenience only, unless the law of your country requires otherwise.

24Changes to these terms

We may update these Terms, for example when we change the app, introduce ads or paid features (§15), or when the law changes. The effective date and version at the top of this page show which version applies, and the version history (§25) summarises the changes.

For material changes we give reasonable notice before they take effect, for example in the release notes or in the app. If you keep using the app after the changes take effect, you accept the updated Terms; if you do not agree, stop using the app and uninstall it. Changes do not apply to disputes that arose before they took effect.

25Version history

26Contact

• Developer: Zydeno, the developer of Basswright on Google Play
• E-mail: support@zydeno.com
• Website: zydeno.com

See also the Privacy Policy.