As an expert in luxury events and wedding planning for over 35 years, Colin Cowie has always been excited about innovation, technology and ways to drive efficiency across the CCL team. Colin invested in That’s The One in 2021 as the vision to streamline the planners backoffice, provide a transparent process for couples and manage guest logistics, is something he always believed would be the future.

With over 35 years in luxury wedding and event planning, Colin Cowie has built a global reputation for creating breathtaking experiences. As the founder of Colin Cowie Lifestyle, he’s always embraced innovation and cutting-edge tools to elevate both client experience and operational efficiency.

In 2022, Colin invested in That’s The One, a powerful, all-in-one wedding planning app and event planning softwaredesigned to streamline workflows for planners, simplify processes for couples, and manage complex guest logistics with ease. The vision behind That’s The One aligned perfectly with Colin’s belief that the future of wedding planning software lies in smart, collaborative platforms built for both professionals and brides.

Launch in Paris, Eiffel Tower

The Growing Demand for Smarter Wedding Planning Tools

Planning a wedding can be extremely stressful and manually intensive, especially behind the scenes. From using sticky notes on seating charts to spreadsheets for managing RSVPs, planners have been relying on outdated systems that are manual and error-prone. For most wedding planners and event professionals, managing details like guest logistics, vendor communication, and timelines requires hiring an additional coordinator to stay organized, which is an additional overhead for the business.

The industry has been patiently waiting for a smarter, more integrated wedding planning software that empowers planners to focus on what they do best: designing unforgettable experiences for their clients and guests.

Why That’s The One Is the Best Wedding Planning Software Today

The team behind That’s The One set out to build the best wedding planning software, not just another checklist app. Before building anything, they spoke with hundreds of wedding and event planners to identify their pain points, from managing guest lists to building timelines and coordinating multiple vendors.

The result? A powerful, all-in-one wedding and event planning software platform that saves time, improves collaboration, and scales effortlessly with each event,  whether it’s a one-day celebration or a multi-day destination wedding.

One of our favorite features is the guest management system. As weddings become more complex with multiple events, international guests, (and complex dietaries!)  tools like these are indispensable. That’s The One offers:

• A sophisticated guest list manager
• Integrated RSVP tracking
• Digital invitations (e-cards)
• A customizable wedding website
• A dedicated guest accommodation tracker

We absolutely love that all guest data syncs directly with seating charts and floor plans, giving caterers, venues, and planners one reliable source of truth. It's the most reliable guest list software for wedding planning we’ve used to date.

TTO also helps our team with their planning activities:

• A visual overview page for upcoming tasks, payments, and deadlines
• Automated reminders and status updates
• Collaborative timeline and itinerary templates
• Budget tracking and financial planning tools
• A built-in vendor CRM for managing contacts and contracts
• Real-time collaboration across our entire team and clients

If you're searching for the best app for wedding planning, That’s The One is unmatched in capability, ease of use, and flexibility.

Why Top Event Planners Recommend That’s The One Over Other Wedding Planning Tools

All-in-One Platform, Not a Patchwork of Tools

One of the biggest frustrations among wedding and event planners is having to juggle multiple platforms and subscriptions manually. One for guest lists, another for seating charts, another for budgets, and yet another for timelines or floor plans. Most software tools do one thing well, which forces planners to manage 7–10 different tools, increasing the risk of errors and miscommunication.

That’s The One, all-in-one wedding planning software, keeps everything under one roof, with a single login, one source of truth, and an intuitive interface which can be reskinned to align with your brand.

The pricing is designed to be accessible. At just $60/month for unlimited events and a 1 month free trial, it’s the best wedding planning software investment for both experienced planners and those getting started.

How It Compares to Other Wedding and Event Planning Software

For a full breakdown of how That’s The One compares to other platforms, like Aisle Planner, Prism, Paperless Post or Canva, check out this article that reviews the pros and cons of popular planning apps and software. 

Frequently Asked Questions

Why is That’s The One considered the best wedding planning software?

TTO is wedding planning software that has been built with planners for planners. It provides a single source of truth for planning teams and their clients. Everything from timelines to websites and reliable guest management features - it is event planning software we couldn’t recommend enough.

Is it available in English only?

No, it is available in 6 other languages: Spanish, French, German, Italian, Polish, Portuguese.

What features are included in That’s The One wedding planning software?

TTO is an all-in-one software intended to be used by planning teams and their clients. Planners can create a contacts CRM, templates and manage their sales functions. With their clients, they can invite them to a dedicated wedding planning space, where they will have access to features like RSVP, guestlist, digital invitations, websites and planners can manage tasks, timelines, floor and seating plans, payments, approved vendors and budget.

Can That’s The One be used for destination wedding planning?

Yes absolutely! You can track payments in all currencies and event translate the budget sheet to translate all the foreign payments into a currency your client understands. For example, if planning an event in Europe and all payments are in EUR, you couple can quickly see how this translates into their currency (USD for example).

The RSVP also allows you to ask for attendance for private events to VIP guests, all within the same URL, by managing question settings. It also allows guests to RSVP in groups, manage babies/infants settings and even download a QR code to print on a physical invite!

Does it work for weddings only? What about corporate or other private events?

You can use TTO for any kind of event. The language is not ‘couple’ but ‘client’ for example. The nuts and bolts of event planning are the same, where you will have a guestlist, need to manage RSVPs and guest communications within a budget where vendors need to be paid for instance!

How does That’s The One compare to other wedding and event planning software?

We have tried other softwares in the past, but none of them suited our needs or delighted our clients. Being able to work with the TTO team on the features and designs, has meant that they have been able to overtake competitors with an exceptional product.

Is That’s The One suitable for brides planning their own wedding?
Brides can use TTO plan their wedding on a basic tier where they get access to 1 event here. For couples looking to find a trustworthy wedding planner, we strongly recommend TTO’s directory: https://directory.thatstheone.com.

What wedding checklist does That’s The One offer?

Planners can create unlimited checklist and task templates. You are able to pre-assign an owner, pre-assign a deadline (eg. always 10 months before wedding), pre-assign priority and determine if it is visible by all collaborators, or just you or your planning team.

Once imported into a event, the checklist will automatically set the accurate dates and based on your template settings, assign owners. At any one point, you can see who is working on what, what has been completed, and if anything is outstanding. Both clients and planners receive automated reminders which can also be switched off in settings.

What features make That’s The One ideal for managing guest lists and RSVPs?

We believe TTO is the best software for managing RSVPs and guestlists. Here are some reasons why:

• Single RSVP link to share on any platform and collect information digitally
• Custom RSVP Questions
• Multi-Event RSVPs
• Guests can RSVP on behalf of others
• Manage +1s
• Advanced settings for babies & children
• Matches guests using phone number and/or email

All of this information is synced with the guest list and the floor/seating plan.

What is the most reliable wedding planning software for managing timelines and budgets?

We enjoy using That’s The One for managing timelines because of it’s ability to create individual timelines for each vendor in 1 click. This helps us keep all the vendors in the know quickly and all of the important details are displayed in a PDF, alongside the vendors contact information, instagram handles and email addresses. This means vendors can easily get in touch with each other on the day.

Can you create timeline templates?

Yes of course, you can create timeline templates on thatstheone.com also. Here is a guide showing you how to create one: https://www.thatstheone.com/planners/wedding-guides/templates

Is there a wedding planning checklist?
Yes of course, you can create wedding planning checklists on TTO as well. Here is a guide showing you how to do that: https://www.thatstheone.com/planners/wedding-guides/todo

How does That’s The One help with creating a wedding website and sending digital invitations?

On TTO, planners and their clients get access to a free event website and limited ecards. For the ecards, you can either use the pre-made templates, or upload your own bespoke designs. The website is super easy to use, all you need to do is choose your font, colors and update the placeholder text with you accurate information. It is automatically connected to the RSVP. You’ll see the website update in real time. Once you are done, hit “publish” and you are live! You can read more about building free websites on That’s The One here.