These terms apply when you use Diagonalise (https://www.diagonalise.com). Please read them carefully. By creating an account or using the service, you agree to them.
About us
Diagonalise is run by [Company legal name], [Company registration], of [Registered address] ("we", "us"). You can contact us at support@diagonalise.com.
"You" means the person or business using Diagonalise. If you use it for a business, you confirm you are allowed to accept these terms for that business.
Who the service is for
Diagonalise is for use in the course of a business, such as by sole traders, freelancers, contractors and small companies. You are not a consumer when you use it. You must be at least 18.
The service
Diagonalise helps you create invoices, record expenses, manage customers and products, and produce reports and Self Assessment figures organised by the UK tax year.
We are not your accountant or tax adviser. Reports, Self Assessment figures, tax estimates and VAT threshold information are based on what you enter and are for guidance only. You are responsible for checking them, for your tax returns, and for keeping the records HMRC requires. If you are unsure, take advice from a qualified accountant.
Your account
- Give us accurate information and keep it up to date.
- Keep your password and any API tokens secret. You are responsible for everything done through your account, including by team members you invite and AI apps you connect.
- Tell us straight away at support@diagonalise.com if you think someone has accessed your account without permission.
- The account owner controls the business account, its plan and who can access it.
Free trial, plans and payment
- New accounts get a 14-day free trial. You do not need a card to start.
- Paid plans are billed in advance, monthly or yearly, through our payment provider Stripe. Prices and what each plan includes are shown on our pricing page.
- If you upgrade, you pay the prorated difference for the rest of the current billing period. If you downgrade, the change takes effect at the end of the current billing period.
- Plans may have limits, such as the number of invoices, customers or team members. If you reach a limit, you will need to upgrade to add more.
- We may change our prices. We will give you at least 30 days' notice before a change applies to your subscription, and you can cancel before it does.
- If a payment fails, we may limit your account to the Free plan until it is paid.
Cancelling
You can cancel your subscription at any time from the Billing page. You keep access to your paid plan until the end of the period you have paid for, then your account moves to the Free plan. We do not refund part-used billing periods unless the law requires it.
Your data
- Everything you put into Diagonalise remains yours. You give us permission to store and process it only so we can provide the service to you.
- You can export your data at any time.
- If you close your account, we delete your data within 30 days, apart from anything we must keep by law. Export anything you need first.
- Our Privacy policy explains how we handle personal data.
Data processing
When you put personal data about other people into Diagonalise, such as your customers' contact details or team members' email addresses, you are the controller of that data and we process it for you as your processor. For that processing, we will:
- only process the data to provide the service, and on your documented instructions (which these terms and your use of the service make up), unless the law requires otherwise
- make sure anyone we authorise to process it is bound by confidentiality
- keep it secure using appropriate technical and organisational measures, including encryption of personal details at rest
- only use sub-processors who are bound by data protection terms at least as protective as these. We currently use Stripe for payments and [Hosting provider and location] for hosting and email, and will tell you before adding or replacing a sub-processor so you can object
- help you, as far as we reasonably can, to respond to requests from people exercising their data protection rights, and to meet your own security, breach notification and impact assessment obligations
- tell you without undue delay if we become aware of a personal data breach affecting your data
- delete or return the data when you close your account, as described above, unless the law requires us to keep it
- give you the information you reasonably need to show that these obligations are met
You are responsible for having a lawful basis for the personal data you put into Diagonalise.
Making Tax Digital
If you connect Diagonalise to HMRC, you authorise us to send information to HMRC on your behalf when you ask us to. The figures we send are built from the invoices and expenses you have recorded. You are responsible for checking them before you submit, and for anything you submit. We are not responsible for penalties, interest or tax that result from information you provide or approve. HMRC's own terms also apply.
AI assistants and the API
If your plan includes it, you can connect AI apps such as Claude, ChatGPT or GitHub Copilot, or use the API with a personal access token.
- You choose which apps to connect and what access they have. Anything a connected app does in your account is treated as done by you.
- AI apps can make mistakes. Check what they create or change before you rely on it.
- The AI app's provider handles your data under its own terms. We are not responsible for third-party apps.
- Keep API tokens secret and revoke any you no longer need. We may revoke a token or connection if we believe it is being misused.
Acceptable use
Do not:
- break the law, or use Diagonalise for fraud or to mislead anyone
- upload anything you do not have the right to use, or anything harmful, such as malware
- try to access other accounts or data you are not allowed to see, or test, probe or attack our systems
- overload the service, including through automated access that goes beyond normal use of the API
- copy, resell or reverse engineer the service, except where the law allows
Availability and changes to the service
We work to keep Diagonalise available and secure, but we cannot promise it will always be available or free of errors. We may need to carry out maintenance, and we may change or improve features. If we remove a significant feature you pay for, we will tell you in advance.
Our intellectual property
We, or our licensors, own Diagonalise, its software, design and content. These terms give you a right to use the service, not ownership of it.
Our liability
- Nothing in these terms limits liability for death or personal injury caused by negligence, for fraud, or for anything else that cannot be limited by law.
- We are not liable for loss of profits, revenue, business, goodwill or data, or for any indirect or consequential loss.
- We are not liable for tax, penalties or interest arising from your tax affairs, or for decisions you make based on reports or estimates in Diagonalise.
- Otherwise, our total liability to you in any 12 months is limited to the amount you paid us in the 12 months before the claim arose.
Suspension and closure
We may suspend or close your account if you seriously or repeatedly break these terms, if you do not pay, or if we must do so by law. Where we reasonably can, we will warn you first and give you a chance to export your data. You can close your account at any time.
Changes to these terms
We may update these terms. The version number and effective date are shown at the top of this page. If we make changes that significantly affect you, we will tell you by email or in the app at least 30 days before they take effect. If you keep using Diagonalise after that, the new terms apply.
General
- If any part of these terms cannot be enforced, the rest still applies.
- If we do not enforce a right straight away, we can still enforce it later.
- You may not transfer your rights under these terms without our agreement. We may transfer ours to a business that takes over Diagonalise.
- These terms are governed by the law of England and Wales, and the courts of England and Wales have exclusive jurisdiction.