Terms of use

Who you are contracting with

Tonelva is operated by Vast Flow, LLP. "We", "us" and "our" mean Vast Flow, LLP. "The app" means the Tonelva mobile application on iOS and Android. "The site" means tonelva.com, including the free calculators published on it.

What we provide

A diary for readings you take with your own blood pressure cuff, tools that classify and average those readings against published reference standards, and written reference material about home blood pressure monitoring. That is the entire scope of the service.

Tonelva does not measure, diagnose or treat

Tonelva is not a medical device. It does not measure blood pressure — no phone can, and any app claiming to do so with a camera or a fingertip is not measuring arterial pressure. Every number in the app is one you entered from a validated cuff or imported from Apple Health.

Nothing in the app or on this site is medical advice, a diagnosis, or a recommendation about treatment. We do not tell you what your target should be, and we will not, because targets are individual and set by your clinician alongside everything else they know about you. We never suggest starting, stopping or changing a medication or a dose.

The categories the app and the tools display are published reference thresholds — the 2017 ACC/AHA classification and the ESC/ESH classification — applied to a number. A classification is not a diagnosis. Hypertension is diagnosed by a clinician from repeated readings, usually taken away from a clinic, interpreted together with your history and your overall cardiovascular risk. One reading, however alarming it looks, establishes nothing on its own.

When to seek urgent care

This is the one place where we will be directive. A very high reading together with chest pain, breathlessness, weakness or numbness, difficulty speaking, vision change, severe headache or confusion means emergency medical care, immediately. Do not enter it in a diary and wait. If you are unsure whether something is urgent, treat it as urgent and let a clinician decide.

Free tools on this site

The tools are provided free and without warranty of any kind. Everything you type stays in your browser and is never transmitted to us. Category thresholds are taken from the published guidelines and the formulas are printed on the pages so you can check any result by hand. If something looks wrong, it may be, and we would like to hear about it.

Your records

Readings you enter are stored on your device and nowhere else. We hold no copy, which means we cannot restore your history if you delete the app, lose the device, or reset it without a backup. Keeping a backup is your responsibility: use the export function, or enable Apple Health sync, which in practice becomes your recovery path.

Subscriptions and billing

Logging readings and keeping unlimited history are free. A Pro subscription costs $4.99 weekly or $39.99 yearly with a 7-day free trial on the yearly plan. Prices displayed in the app are set in App Store Connect and Google Play Console and are authoritative; prices on this website are informational and may lag a change or differ by region and currency.

Subscriptions are sold and processed by Apple or Google. Payment is charged at confirmation of purchase and renews automatically unless auto-renew is turned off at least 24 hours before the end of the current period. If a free trial is offered and you subscribe to the same plan before it ends, the unused portion is forfeited, which is the store's rule rather than ours.

Cancelling

Cancel at any time in your Apple or Google account settings. Cancelling during a free trial costs nothing. Cancellation takes effect at the end of the current billing period and you keep Pro features until then. We cannot cancel on your behalf because we do not control the billing relationship. Step-by-step instructions for both platforms are on the contact page.

Refunds

Refunds are handled by Apple and Google under their own policies and requests go through them. If you were charged in error, contact us as well — we cannot move the money, but we can support your request, and we will.

Acceptable use

Use the app and the site for their intended purpose. Do not attempt to disrupt them, do not scrape the site at a volume that degrades it for others, and do not redistribute the calculators as your own product. You may quote and link to anything we publish, and we would prefer that to an inaccurate paraphrase.

Intellectual property

The app, the site design, the written articles and the calculators are our intellectual property. Third-party names and trademarks appearing on this site, including the names of other apps on the comparison pages and the generic and brand names of medicines referred to descriptively, belong to their respective owners. Their appearance does not imply affiliation with or endorsement by those owners, and nothing here should be read as a claim to be associated with any pharmaceutical manufacturer.

Accuracy and corrections

We aim to be accurate and we will sometimes be wrong. Guidelines are also revised, and a threshold that is current today may not be in three years. If you find an error, or a page that has fallen behind a guideline update, write to [email protected]. We correct mistakes and we say that we have rather than editing silently. In a subject where an arithmetic error can matter, this is not a courtesy but a duty.

Feedback

If you send a suggestion or a feature idea, we may act on it without owing compensation or attribution. That exists because good ideas frequently arrive from several users independently and we cannot run a product where implementing an obvious improvement creates a claim. If you want to send something you consider confidential, tell us before you send it.

Availability and changes to the service

We may change, suspend or discontinue any part of the app or the site, including individual features and individual free calculators. We have no plan to remove any of the free calculators and we will not put an existing free one behind a paywall.

Third-party services

The app and site depend on services we do not control, including Apple and Google for distribution and billing and the providers named in the privacy policy. Their terms apply to their services. We are not responsible for the content or practices of any third-party site we link to.

Limitation of liability

To the fullest extent permitted by law, we are not liable for indirect or consequential loss arising from use of the app or the site, including any loss arising from reliance on a classification or an average, from data lost when an app is deleted, or from any decision made about your health. Decisions about your treatment belong with your clinician, and this app is a record rather than an adviser. Where liability cannot be excluded, it is limited to the amount you have paid us in the twelve months before the claim, which for most users is zero. Nothing here limits liability for death or personal injury caused by our negligence, or for fraud, where such limitation is not permitted by law.

Severability, waiver and assignment

If a provision is unenforceable it is limited or removed to the minimum extent necessary and the rest stands. Not enforcing a provision once is not a waiver of it. You may not transfer your rights without our consent; we may assign ours as part of a merger, acquisition or sale of assets, on notice. With the privacy policy, these terms are the entire agreement between us about the app and the site.

Termination

Stop using the app at any time by deleting it. We may suspend access if the acceptable-use terms are breached in a way that harms the service or other users. Ending your use does not entitle you to a refund of a period already paid for, which remains subject to the store's policy.

Age

The app is intended for adults keeping their own record, or keeping one for a family member with their knowledge. You must be old enough to form a binding contract where you live in order to subscribe, and where you are under the age of majority a parent or guardian must agree to these terms on your behalf. The reference categories used throughout are adult thresholds and do not apply to children.

Export and portability

The app can export your record as a PDF or a CSV file that you keep. That export, and Apple Health sync if you enable it, are the only routes by which your data leaves the device, and both happen under your control rather than ours. Use one before changing devices, because we hold no copy and cannot restore anything.

Availability and changes to the service

We may change, suspend or discontinue any part of the app or the site. We have no plan to remove any of the free tools and we will not move an existing free one behind a paywall. If a paid feature were discontinued during a subscription period we would say so in the app, and the store's refund process remains open to you.

Governing law

These terms are governed by the laws applicable to Vast Flow, LLP's place of establishment. If you are a consumer, this does not deprive you of the protection of the mandatory consumer law of your country of residence.

Contact

Anything about these terms goes to [email protected].