Terms

Who you are dealing with

21x Studio, a software studio operated by Jeffrey Yoon. Reachable at hello@21x.studio.

What is being sold

A custom booking system built for your business, delivered live within 14 days of the kickoff call, followed by an ongoing monthly service covering hosting, support and changes.

It takes one of two shapes, agreed in writing before anything starts. Either it sits alongside the booking platform you already run, doing the one thing that platform will not, or it replaces that platform outright and the software becomes yours. The second means migrating your clients, your schedule and your history — and it means you stop paying a licence. What you pay me afterwards covers hosting, support and changes; it is never a fee per booking, and it never takes a percentage of what a client pays you.

Price and payment

Every build is scoped to one business, so the figures are agreed in writing before any work starts rather than published here. The structure does not vary:

• A one-off setup fee — half due before work starts, half on the day it goes live.
• A monthly fee — begins at go-live, charged automatically via Stripe, covering hosting, support and changes. An annual prepay option is available at a discount.
• Founding clients keep the rate they signed at for as long as they remain clients, including through later price rises.

The 14-day guarantee

If your system is not live and taking real bookings within 14 days of kickoff, you do not pay the setup fee. The clock is mine to manage, with one honest exception: it pauses while I am waiting on something only you can give me — content, access, a decision, an answer. Those pauses are recorded and visible to you, not claimed after the fact.

The Full-Calendar Guarantee

If the system has not paid for itself within 90 days of go-live, I keep working on it at no additional cost until it does. “Paid for itself” means measured against the figures we agree in writing at kickoff, not against a number invented afterwards by either of us.

What runs on someone else’s platform

Your system depends on services I do not own — hosting, the database, payments, messaging, and whatever booking or calendar software you already run. I pick them, I keep them working, and their ordinary cost is inside your monthly fee. What I cannot do is guarantee someone else’s uptime, promise their pricing will never change, or stop them discontinuing a product. If one of them breaks or leaves, moving you to a replacement is my job and my cost, not a new project you pay for.

Where a service bills you directly rather than through me — most often payment processing fees — that is between you and them, and I will say so before it starts rather than after.

Who owns what

Your data, your content and your brand are yours throughout. On full payment of the setup fee, the custom work built for your business is yours. I keep the right to reuse the general techniques and components underneath — that is what makes the next build fast, and it never includes anything specific to you.

I would like to describe the work publicly and name you. If you would rather I did not, say so and I will not.

Ending it

The monthly service can be cancelled at any time with 30 days’ notice, and there is no exit fee and no contract minimum. On request I will hand over your data in a standard format. You are not locked in; being locked in is most of what is wrong with the alternatives.

If I am not around

You are buying from one person, so you are entitled to ask what happens if that person is ill, unreachable, or stops doing this. The answer is not “it will be fine”.

• Your system runs on infrastructure I can transfer into your own accounts, and the code is yours once the setup fee is paid. Neither depends on me being available to release it.
• Your data is exportable in a standard format at any time, by you, without asking me first.
• If I am going to be unavailable for more than a few days, you will hear it from me in advance wherever it is possible to know in advance.
• If I stop offering this service, you get 90 days’ notice, a full handover of code, data and access, and no further monthly fees from the day the notice goes out. Not the last day of it.

It is a real risk and it is priced into what you pay. What I can promise is that it never becomes your emergency without warning.

What I do not do

No treatment charts and no patient health information. No guarantee of specific booking volumes, revenue, or search rankings — anyone promising you those is guessing.

Liability

My total liability under these terms is limited to the fees you have paid me in the twelve months before the claim. Nothing here limits liability that cannot lawfully be limited.

Changes to these terms

These terms can change for new work. What we agreed in writing for your build does not change underneath you — if I want to alter something that affects an existing client, I ask, and it takes effect only if you agree. Silence is not agreement, and a quiet edit to this page has never changed a deal that was already struck.

Law

These terms are governed by the laws of the State of California, United States, and any dispute belongs to the state or federal courts sitting in Los Angeles County.

Before either of us goes anywhere near that: tell me what is wrong and give me 30 days to put it right. Almost everything that looks like a dispute is a misunderstanding about scope, and it is cheaper for both of us to find that out over a phone call.