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KLO Calculator

Terms of use

Effective date: 8 November 2026

These terms are between KLO Technical Services Limited, trading as KLO Development Services, company number 16105032, VAT number GB 481 4401 07, registered office 23 Brook Road, Bomere Heath, Shrewsbury, Shropshire, SY4 3PU ("KLO", "we"), and you, the person or firm using KLO Calculator.

If you got the app from the App Store or through TestFlight, Apple's own terms for those also apply, including Apple's standard licence for apps. These terms add to them.

What KLO Calculator is

A calculator for site and office, on iPhone, iPad, Mac and the web: a basic and scientific calculator with a tape, unit and currency conversion, a notepad that works out each line, and construction calcs with checks against the Approved Documents.

The checks are a guide, not a design

  • The construction checks follow the Approved Documents for England: A 2004, H 2015, K 2013 (2020 amendments), L 2021, M 2015 and S 2021. Wales, Scotland and Northern Ireland have their own rules, which the app doesn't check.
  • The answers are a guide, not a design. Building Control, a structural engineer or a qualified electrician has the final word. The beam, joist, padstone, lintel and volt drop answers are preliminary sizing only.
  • The trade figures are typical figures, such as densities, bulking and coverage. Use your supplier's or maker's figures where they differ; the app lets you.
  • You are responsible for what you order, build and submit, and for checking the answers before you rely on them.

Who sells

KLO Calculator and its subscription are sold by KLO Technical Services Limited, trading as KLO Development Services, registered in England and Wales, company number 16105032, 23 Brook Road, Bomere Heath, Shrewsbury, Shropshire, SY4 3PU. Email: [email protected].

What you get

  • Free: the calculator, Convert, the tape, Notepad and ten construction calcs (areas, dig, paving, concrete, masonry, stairs, roof, solar panels, plaster and paint) work fully.
  • Without a subscription, every other calc opens with its example figures, but you can't change them. Nothing you've kept is locked away: it can still be opened, read and copied.
  • A subscription lets you type your own figures into every calc, save named jobs and make PDF reports. One subscription is for one person, under one email address, and works in the app on Mac, iPhone and iPad and on the web page.

Price, payment and renewal

  • £2.99 a month or £24.99 a year. Prices include VAT.
  • In the app, the App Store may offer a 14-day free trial before the first payment; it is shown on the subscription screen before you subscribe, and cancelling during it costs nothing.
  • Bought on the web page, payment is taken by Stripe; bought in the app, by Apple, under Apple's terms. We never see your card details.
  • The subscription renews automatically at the end of each month or year, at the price then shown, until you cancel. We will tell you by email at least 30 days before any price rise.

Cancelling

  • Web: Settings › KLO account › Manage subscription › Cancel. App Store: your Apple Account's Subscriptions settings.
  • Cancelling stops the next renewal. Editing stays open until the end of the period you have paid for; after that the app and the page go back to the free calcs and view-only. Nothing you've kept is deleted.

Your right to cancel within 14 days

If you are a consumer and subscribe on the web, you may cancel within 14 days of your first payment and get a full refund: email [email protected]. After that you can cancel future renewals at any time (see Cancelling). Purchases in the app follow Apple's refund policy. For a fault, email us and we will put it right or refund you as the law requires.

Where your data is kept

What you type stays on your device: in the app, on that device; on the web, in that browser. We don't receive it. Clearing the browser's site data erases what the page kept. You are responsible for keeping copies of anything you need.

Testing

A test version may change, stop working or expire (TestFlight builds expire after 90 days), and may have faults.

Availability and changes

  • Currency rates come from api.frankfurter.dev, which KLO doesn't run. If it can't be reached, the app shows the rates last loaded and their date.
  • We may improve the app and the page. What you've typed stays on your device.

Liability

  • Nothing in these terms limits liability for:
    • death or personal injury caused by negligence;
    • fraud;
    • anything else that can't be limited by law.
  • If you use KLO Calculator as a consumer, these terms don't take away your rights under the Consumer Rights Act 2015.
  • KLO isn't liable for:
    • loss of profit, revenue, business or goodwill;
    • indirect or consequential loss;
    • the cost of materials ordered, or work done, on an answer that wasn't checked.
  • Otherwise, KLO's total liability for all claims in any 12 months is limited to what you paid for KLO Calculator in those 12 months.

Ending

You can stop using KLO Calculator at any time by cancelling your subscription and deleting it. KLO may end your right to use it if these terms are seriously broken and the problem isn't put right within 30 days of being told.

Changes to these terms

If these terms change, the new version is put on this page with its date. If a change is not in your favour we will tell subscribers by email at least 30 days before it applies; you may cancel before then.

Law

These terms are governed by the law of England and Wales, and its courts deal with any dispute. If you are a consumer living in Scotland or Northern Ireland, you can also bring a claim there.

Contact

KLO Development Services, 23 Brook Road, Bomere Heath, Shrewsbury, Shropshire, SY4 3PU. Email: [email protected].