The operating system for event professionals

Your business. Your tools.
Your Source of Truth.

One shared record for every event. Your team, your clients and your vendors each see exactly what they should, and a change made once updates everywhere.

Your team
Your clients
Your vendors
Start free for two months → See the tools for your business

The Founding 100: founding rates from $40/month for the first 100 businesses.

Source of Truth Event / 0248  ·  Rev. 04
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Whitfield Wedding

Confirmed

Saturday 19 September  ·  The Brick House  ·  144 guests

OverviewDetailsFinancialsRun of show Floor planFilesTasks
60′–0″
40′–0″
144 guests · 18 tables

Ten professions. One platform.

Built for the people whobring events to life.

Choose your business to see the tools you get. Your workspace shows those and leaves out the ones you don’t need. Work across more than one? Add them all.

01

Event planners, producers & designers

Run every moving part of an event from first call to last load-out.

  • Master timelines & run of show
  • Budgets, fees & vendors
  • Design boards & floor plans
  • Guests & seating

02

Venue owners & managers

Every space, hold and tour on one calendar, without double-booking.

  • Rooms, venues & capacities
  • Availability, holds & tours
  • Rental packages & add-ons
  • Venue operations & revenue

03

Florists

From the first design board to the last centrepiece on the table.

  • Design boards & client approvals
  • Arrangements & recipes
  • Stem counts & purchasing lists
  • Installation schedules

04

Caterers

Menus, headcounts and the kitchen plan, tied to the event they feed.

  • Menu management
  • Guest counts & dietary needs
  • Banquet event orders
  • Prep checklists & staffing

05

Rental companies

Know what’s out, what’s back and what’s already promised.

  • Inventory catalog & availability
  • Reservations & conflict checks
  • Pull sheets & deliveries
  • Damaged or missing items

06

Photographers, videographers & content creators

Book, shoot, deliver and get sign-off without a separate proofing site.

  • Questionnaires & shot lists
  • Branded galleries & video playback
  • Favorites, comments & revisions
  • Approvals & final downloads

07

DJs & entertainers

Bookings, packages and every detail of the night, in one place.

  • Bookings & performance calendar
  • Packages & add-ons
  • Client questionnaires
  • Music, event details & riders

08

Bartending companies

Bar packages, client details and the crew to pour them.

  • Bar packages & per-guest pricing
  • Client questionnaires
  • Bartender schedules
  • Beverage planning & bar calculator

09

AV & lighting companies In development

Equipment, crews and cues for every production you run.

  • Equipment catalogs & reservations
  • Technical requirements
  • Production schedules & cue sheets
  • Crews, load-in & breakdown

10

Event staffing companies In development

The right people, on the right shift, confirmed and paid.

  • Staff database & availability
  • Scheduling & shift assignments
  • Confirmations & attendance
  • Timesheets, labor cost & invoices

Every workspace also includes CRM & inquiries · proposals & e-signatures · invoices & payments · client portal & messages · calendar · files

Why Source of Truth

One change,everywhere it matters.

Dinner moves half an hour. In one place, that is one edit. Everything that depended on it updates itself.

Dinner service
6:30 PM
7:00 PM
→
Run of showUpdated
CatererNotified
DJUpdated
ClientUpdated
TeamUpdated

Collaboration

One event,one source of truth.

Keep your team, clients, and event partners connected through one shared event workspace. Share the details that matter while keeping private business information protected.

Permissions decide what each person sees, and the fields they can't see are never sent to their browser. Invited clients and vendors don't pay a thing.

Team view
  • Fees & margins
  • Vendor pricing
  • Contracts & balances
  • Internal notes
  • Production details
  • Every event, every venue
Client view
  • Timeline & to-dos
  • Mood board
  • Seating chart
  • Contract & payments
  • Your margin
  • What vendors charge you
Vendor view
  • Their scope of work
  • Load-in time & venue access
  • The tables and rooms they cover
  • Installation details
  • Other vendors' fees
  • Client financials

For your clients

Effortless for them, too.

Your clients never get a pile of links and attachments. They get one place for their event, and a guided start the first time they sign in.

A welcome, not a manualThree short screens on first sign-in: what this is, where everything lives, and what comes first.
Always the next stepTheir home screen lists what you need from them, in order: sign the contract, make the deposit, answer the questionnaire. Each step ticks off when it's done.
Nothing to chaseAgreement, payments, timeline, files and every message stay with the event, on any phone.

Product

The whole event,connected.

Not six tools that export to each other. One record that every part of the job reads from.

Floor plans & seating

Drag tables, seat guests, print the chart. The room and the list are the same object.

Floor plan builder with numbered tables and seat counts

Calendar

Every event, hold, site visit and load-in across every venue you run.

Month calendar showing scheduled events

Financials

Budget against actual, line by line, with the margin on the same screen.

Budget screen with line items, actuals and margin

Contracts & signatures

Send, sign and countersign in the event. Timestamped and tamper-evident.

Signed contract with signature block and timestamp

Run of show

Minute by minute, with the person responsible on every line. On a phone all night.

Run of show timeline with times and owners

Mood boards

What the client wants, attached to the event the vendors are quoting.

Mood board of event design references
Inquiry form & alertsA link of your own with your questions. Every inquiry lands as a lead and emails you.
Client portalClients sign in to their booking, agreement, payments and messages, with a guided welcome and their next step always first.
E-signaturesA guided signing screen, initials on every section and a certificate of completion.
Invoices & remindersPayment schedules with your Pay now link, and automatic reminders around each due date.
Inventory & pack listsCount your stock, pack it per booking, check it back in and bill what was used.
Messages & emailOne thread per booking with clients and vendors, with opened-email tracking.
AI assistantAsk about your bookings, draft agreements and see what is overdue.
Light & dark modeYour logo, your colours, and a screen that is easy on the eyes after midnight.

Replace thepatchwork.

Most planners are paying for six subscriptions that don't talk to each other. Here is what that costs at list price.

A Aisle Planner $109.99
P Prismm $79.00
T Timeline Genius $54.95
H HoneyBook $59.00
C Canva Pro $18.00
G Google Workspace $8.40
Your current stack
$329.34 /month
Six logins. Six places the truth can drift.
SOT Full
$179$249 /month
Founding 100 rate (standard $249). 8 team members and 1 TB of storage included.
You save
$150.34$80.34 /month
More than $1,800 a yearNearly $1,000 a year back in the business.

Savings are shown at the SOT Full rate. Publicly listed pricing as of August 2026: Aisle Planner Professional $109.99/mo, Prismm Professional $79/mo, Timeline Genius Pro $54.95/mo, HoneyBook Essentials $59/mo, Canva Pro $18/mo, Google Workspace Business Standard $8.40/user/mo. Your stack will differ. The point is the arithmetic, not the exact number.

The Founding 100

Be one ofthe first 100.

The first 100 event businesses to subscribe get founding rates, kept for as long as they stay.

See plans & pricing → Estimate your price

Essentials1 team member · 100 GB

$40/monthStandard $59

Business3 team members · 500 GB

$79/monthStandard $149

Full8 team members · 1 TB

$179/monthStandard $249

Limited to the First 100 Businesses

100 places across all three plans. Applied automatically at sign-up, no code.

The Founding 100

The Founding 100 isofficially full.

Our founding members have secured their rates. You can still join Source of Truth and get the tools built for your business.

Explore SOT plans →

Get started

Start freefor two months.

Create your account in a minute. Choose your business, your plan and your team size: two months free, then your plan’s price each month. Cancel any time before then and you pay nothing.

  1. Your planPick your business, SOT Essentials, Business or Full, and how many people are on your team. The price updates as you choose.
  2. Your accountName, email, password and a card. Nothing is charged today.
  3. Your businessStraight after, a short setup asks what you do, your services and the events you take on.
  4. Your workspaceIt opens with the tools for your profession, ready for your first booking.

About The Founding 100. While founding places remain, your plan is charged at its Founding 100 rate, kept for as long as you stay. Extra team members are $7/month each. How it works

Built by an event producer and venue operator who got tired of running six tools at once.

Choose your business and we’ll suggest a plan. You can pick any of the three. Compare plans

3 included with Business · $7/month for each one after that

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Nothing is charged today. Your card is held for when the two free months end.

By starting, you allow The Seremoni Edit, the company behind Source of Truth, to charge this card your plan’s monthly price once the two free months end, until you cancel. Your card goes straight to Stripe, never to our servers.