Terms of Use

Effective date: October 20, 2026

These terms let you use DOME and ARCH by subscription for your business; you keep ownership of your workbooks, we keep ownership of the software, and the results remain your professional responsibility.

1. The agreement

These Terms of Use are an agreement between you and Luigi Facchini, operating as First Porter, of Carp, Ontario (“First Porter”, “we”, “us”). They apply to the DOME and ARCH Microsoft Excel add-ins (the “Add-ins”). By starting a trial, buying a subscription or using an Add-in, you accept these terms. If you accept them for an organisation, you confirm you have authority to bind it, and “you” means that organisation.

If your organisation has signed a separate written agreement with First Porter, that agreement takes precedence where it differs from these terms.

2. Business use

The Add-ins are professional software for real property financial modelling, sold for business, professional and government use. You must be at least 18.

3. Your licence

While your subscription is paid and current, we grant you a non-exclusive, non-transferable licence to use the Add-ins you subscribed to:

  • Individual subscription: one named person, identified by the Microsoft account they sign in with. That person may use the Add-ins on any of their own devices on which their Microsoft 365 licence allows them to run Excel. The subscription may not be shared with or used by anyone else.

  • Organisation subscription: the users and number of seats set out in the organisation’s agreement or order.

  • Bundle: both DOME and ARCH for one named person.

Without a current licence, an Add-in opens workbooks read-only: you can view them, but not create new projects or edit.

4. Free trial

A new individual subscriber may use the Add-ins free for 30 days. A card is required to start the trial, and the subscription begins and is charged automatically when the trial ends unless you cancel before then. One trial per person. Organisations and governments arrange evaluations, bulk licences and terms directly with First Porter.

5. Fees, renewal and taxes

  • Prices are in Canadian dollars and are shown on firstporter.com. GST/HST and any other applicable sales taxes are added at checkout.

  • Subscriptions are monthly or annual and renew automatically at the end of each period, at the then-current price, until cancelled.

  • We will give you at least 30 days’ notice by email before a price change applies to your subscription.

  • Organisation subscriptions are invoiced on the terms set out in the agreement or invoice. Unless they say otherwise, payment is due within 30 days of the invoice date.

  • If a payment fails, we may suspend access after 14 days’ notice.

6. Cancellation and refunds

You can cancel at any time from your account or by writing to support@firstporter.com. Cancellation takes effect at the end of the period already paid for, and you keep access until then. Fees already paid are not refunded, except where the law requires otherwise or where we end your subscription without cause.

7. Licence checks and offline use

Each Add-in checks your licence with our server when it opens and at intervals while in use. The check sends only the identifiers described in our Privacy Policy, never workbook content. If the server cannot be reached, the Add-in keeps working for 14 days from the last successful check, then becomes read-only until a check succeeds.

8. What you must not do

You must not:

  • share your sign-in, or let more people use the Add-ins than your subscription covers;

  • copy, modify, reverse engineer, decompile or create derivative works of the Add-ins, except as the law expressly allows;

  • remove, disable or get around the licence check, workbook protection or any other technical limit;

  • resell, rent or sublicense the Add-ins, or use them to provide a competing product.

9. Your data and workbooks

You own your workbooks and everything you put in them. The Add-ins process your data inside your copy of Excel; First Porter does not receive, store or have access to it. Keeping your own backups is your responsibility. Our handling of personal information is set out in our Privacy Policy.

10. Our intellectual property

The Add-ins, their calculation methods, templates, help content and the DOME and ARCH names belong to First Porter. These terms give you a licence to use them; they do not transfer ownership. Workbooks created with the Add-ins remain yours, but the templates and structure within them remain licensed to you, not sold. DOME™ and ARCH™ are trademarks of First Porter; you may not use them except to refer to the Add-ins.

11. Professional judgement

The Add-ins are tools that calculate from the information you enter. They do not give financial, investment, legal, tax, engineering or appraisal advice. You are responsible for your inputs, for checking results, and for any decision made using them.

12. Updates, availability and Microsoft

We update the Add-ins from time to time, and updates reach you automatically. We publish release notes for each update. Each Add-in will be available at least 99.5% of the time in each month, as measured and defined in our Service Level Agreement. The Add-ins need a supported version of Microsoft Excel and a Microsoft account, which are provided by Microsoft under its own terms; we are not responsible for Microsoft’s products or services.

13. Support

We provide support by email at support@firstporter.com, Monday to Friday, 8 a.m. to 5 p.m. Eastern Time, excluding Ontario statutory holidays. We aim to reply within two business days. Support is provided in English; support in French will follow. Support covers installing, signing in to, licensing, paying for and using the Add-ins as described in our documentation. It does not cover Microsoft Excel or Microsoft 365, or the content of your own workbooks and models. An organisation’s agreement with First Porter may set different support terms.

14. Warranty disclaimer

Except as required by law or as set out in our Service Level Agreement, the Add-ins are provided “as is” and “as available”, without warranties or conditions of any kind, including merchantability, fitness for a particular purpose, accuracy or non-infringement.

15. Limitation of liability

To the extent the law allows, First Porter is not liable for indirect, incidental, special or consequential damages, or for lost profits, revenue, data or business opportunities. First Porter’s total liability for all claims relating to the Add-ins is limited to the fees you paid in the 12 months before the event giving rise to the claim.

16. Suspension and termination

We may suspend or end your access if you materially breach these terms and do not fix the breach within 10 days of notice, or immediately where needed to prevent harm or unlawful use. If we end a subscription without cause, we will refund the unused portion of fees you prepaid. Sections 8 to 11, 14, 15, 18 and 19 survive termination.

17. Changes to these terms

We may update these terms. We will post the new version here with its effective date and email subscribers at least 30 days before a material change takes effect. If you do not agree, you may cancel before it takes effect.

18. Governing law

These terms are governed by the laws of Ontario and the federal laws of Canada that apply there. The courts of Ontario, sitting in Ottawa, have exclusive jurisdiction, except where the law gives you the right to bring a claim elsewhere.

19. General

Whole agreement. These terms, our Privacy Policy, and any order or organisation agreement are the whole agreement between you and First Porter about the Add-ins. If a court finds any part of these terms unenforceable, the rest stays in effect. If we do not enforce a term right away, we have not given up the right to enforce it later.

Transfer. You may not transfer these terms or your subscription to anyone else without our written consent. We may transfer them to a company that takes over the First Porter business, including First Porter Inc., and will tell you by email if we do. Your rights under these terms are not reduced by the transfer.

Events beyond our control. Neither of us is responsible for a delay or failure caused by events beyond reasonable control, such as an outage of Microsoft 365, Microsoft Excel, Microsoft Entra ID, Stripe or an internet provider. Outages of the Microsoft Azure services that host the Add-ins are covered by our Service Level Agreement, not by this paragraph. This does not excuse payment of fees already due.

Third-party components. The Add-ins use software from other publishers, such as Microsoft’s Office and sign-in libraries. Those components are provided under their own licences, which we list on request. Nothing in these terms limits your rights under those licences.

Organisation licences. Licence checks tell us how many different people in an organisation use the Add-ins. If that number exceeds what the organisation’s agreement covers, we will contact the organisation to agree the additional licences.

Language. These terms are written in English. A French version is in preparation; until it is published, customers in Quebec may ask us for it before subscribing.

20. Contact

First Porter, 1384 Terrace Ridge Drive, Carp, Ontario K0A 1L0, Canada · support@firstporter.com · 613-889-5260