Which is cheaper, That's The One or I Said Yes?

On the headline, That's The One at its published £45 a month. I Said Yes is £49 a month for Planning, or £490 a year, which works out at just under £41 a month, and Complete, which adds enquiries, proposals, contracts and invoices, is £79 a month or £790 a year. No VAT is charged on ours, and neither of us raises the price as your bookings grow.

Does I Said Yes have a wedding website builder?

Yes. Every couple can have a wedding website in one of six looks, Editorial, Nocturne, Plate, Album, Coast and Ledger, built from what you already hold, with an RSVP that updates the guest list itself. Each site can be link-only, behind a password or public.

What happens to the weddings I already have somewhere else?

We move them across for you. Send us whatever your current tool exports and we do it, on any plan, at no charge, usually within five working days. You check it before it counts.

Can a couple use I Said Yes without a planner?

No. The planner owns the workspace and invites the couple; there is no couples-only edition. That's The One lets couples use it free.

Does I Said Yes work offline on the wedding day?

Day mode opens 48 hours before the wedding and holds until 6am the morning after. It keeps the whole day on the phone once you open it, queues anything you do while the signal is gone, and replays it in order when you are back. The rest of the app needs a connection.

How do you keep this comparison honest?

It is written from That's The One's own public pages, it lists what they do better first, and the date we last checked is printed at the bottom. If something here is out of date, tell us and we will correct it.

That's The One vs I Said Yes

That's The One vs I Said Yes is the closest comparison a UK planner will make, because both charge one flat monthly price rather than by the wedding, and both were built recently rather than a decade ago. The differences are in what each one chose to build first. This page says plainly where That's The One is stronger, where I Said Yes is, and who should pick which, from That's The One's own published pages, with the date we last checked at the bottom.

What That's The One does better

Currencies, and the app in other languages: That's The One publishes multi-currency budgets and an interface in several languages (seven on its home page), which matters if you plan destination weddings or keep a couple's budget in euros. I Said Yes works in pounds. Couples' wedding websites can be published in a second language, but the app itself is English.
E-card invitations, and a web address of the couple's own: That's The One sends e-card invitations and save the dates by email, text or link, with replies and opens tracked, and a couple's website can have its own domain. I Said Yes has a wedding website with RSVP for every couple, but no e-cards, and each site lives at an I Said Yes address.
Couples can use it on their own: Couples use That's The One free, and its questions page describes a lighter version for couples planning on their own, so a couple can start there and bring a planner in later. I Said Yes is planner-first: the planner owns the workspace and invites the couple.
Slightly cheaper on the headline: That's The One's published planner price is £45 a month. Ours is £49 a month for Planning, or £490 a year, and £79 a month for Complete. No VAT is charged on either of our plans.

What I Said Yes does better

We move your weddings across for you, free: The real cost of changing software is re-entering twenty weddings by hand and getting some of it wrong. Send us whatever your current tool exports and we do it, on any plan, at no charge, usually within five working days. You check it before it counts.
A wedding website for every couple, in six looks: Editorial, Nocturne, Plate, Album, Coast and Ledger, each with a choice of accent colour and no page builder to fight with. Built from what you already hold, so a section with nothing in it simply is not there. Link-only, password or public, and the guest list updates itself from the replies.
UK-native, not multi-national: The UK is the whole product, not one locale among twenty: giving notice at the register office on the checklist, registrar or celebrant, bank holidays and cup finals flagged on the season strip, VAT-aware totals, DD/MM/YYYY, 24-hour times, suppliers not vendors, evening guests, plus-ones and children's meals.
Day mode for the wedding itself: A one-handed dashboard for the day that assumes a barn and one bar of signal: one running-late offset moves the whole day while the ceremony and the registrar stay fixed, clashes are named in plain English, and anything you do offline queues and replays when the signal comes back. Plus a printed day sheet for the clipboard.
Invoices that chase themselves: In Complete, an accepted proposal becomes a signed contract and then a schedule of invoices that send and chase on their own dates, with the couple's own page to see what is owed. That's The One tracks payments and reminds you; it does not raise invoices or take payments.
Dietary needs treated as health data: Allergies are detected from the guest's own words, counted separately from preferences, and reach only the planner, the day pack and the caterer's sheet. Never the admin area, never another supplier.
Service levels that change what the couple sees: Full planning, partial planning and on-the-day coordination each get their own UK checklist and their own default view for the couple, so an on-the-day couple sees their schedule and guests and nothing that is not theirs.

That's The One vs I Said Yes, side by side

Area	That's The One	I Said Yes
Pricing	£45 a month published for planners, one plan, with a 30-day free trial. No yearly price published.	£49 a month for Planning, £79 for Complete, or £490 and £790 a year. No VAT charged. Unlimited weddings, couples and team members. 30 days free, no card.
Where it is built for	International: an interface in several languages, seven on its home page, and budgets in many currencies. A Delaware company.	The UK: pounds, UK dates and times, the UK legal steps. Couples' websites can be published in a second language.
Contracts and invoicing	Proposals, contracts with e-signature, and payment tracking with reminders. No built-in invoicing or card payments.	Enquiries, proposals, contracts with e-signature, invoices and payment tracking. Included in Complete.
Guests and RSVP	Guest list and RSVP, e-card invitations and save the dates, and a website per event.	Households, meals, dietary flags, spreadsheet import with preview and undo, and a full wedding website with RSVP per couple.
Seating	Seating charts and floor plan design.	A list table plan and a canvas floor plan, with caterer sheets and place cards.
The day itself	Timelines to create and share, with bulk shifting of times.	Day mode: offline-tolerant, one-handed, a whole-day offset with fixed points held, clashes named in plain English, and a printed day sheet.
Couples	Couples use it free, and a lighter version for couples on their own is mentioned.	Planner-first. Couples are invited to a portal the planner shapes, module by module.
Moving in	Guest lists import from CSV, and its team imports complex spreadsheets. No free migration service is stated.	Free on every plan. We do it for you from your existing export, usually within five working days.

Who should choose which

Choose That's The One if you plan weddings in more than one country or currency, you want e-card invitations sent from the same place, or your couples are planning without you for now.

Choose I Said Yes if every wedding you run is in the UK, you coordinate on the day and want it to work standing up, you want the couple to see a calm view rather than the whole tool, or you are moving from another tool and do not fancy typing twenty weddings in again.

Start free Visit That's The One

Questions planners ask

Which is cheaper, That's The One or I Said Yes?: On the headline, That's The One at its published £45 a month. I Said Yes is £49 a month for Planning, or £490 a year, which works out at just under £41 a month, and Complete, which adds enquiries, proposals, contracts and invoices, is £79 a month or £790 a year. No VAT is charged on ours, and neither of us raises the price as your bookings grow.
Does I Said Yes have a wedding website builder?: Yes. Every couple can have a wedding website in one of six looks, Editorial, Nocturne, Plate, Album, Coast and Ledger, built from what you already hold, with an RSVP that updates the guest list itself. Each site can be link-only, behind a password or public.
What happens to the weddings I already have somewhere else?: We move them across for you. Send us whatever your current tool exports and we do it, on any plan, at no charge, usually within five working days. You check it before it counts.
Can a couple use I Said Yes without a planner?: No. The planner owns the workspace and invites the couple; there is no couples-only edition. That's The One lets couples use it free.
Does I Said Yes work offline on the wedding day?: Day mode opens 48 hours before the wedding and holds until 6am the morning after. It keeps the whole day on the phone once you open it, queues anything you do while the signal is gone, and replays it in order when you are back. The rest of the app needs a connection.
How do you keep this comparison honest?: It is written from That's The One's own public pages, it lists what they do better first, and the date we last checked is printed at the bottom. If something here is out of date, tell us and we will correct it.

Compared against That's The One as at Monday 14 September 2026, from its public website. What this page says about I Said Yes was last checked against the product on Monday 14 September 2026. If something here is out of date, email hello@isaidyes.ai and we will put it right.