Last updated 22 September 2026. This is the agreement between you and us when you pay for something on Ceteris. We have tried to write it so you can actually read it.
You can change your mind within 14 days and get all of your money back, even if you have read the whole thing. There is no minimum term. You can cancel at any time in a couple of taps. We will not ask you why.
Everything below says the same thing at greater length. If the two ever disagree, whichever is better for you is the one that counts.
Ceteris is run by Luke Masom, a sole trader trading as Ceteris.
We are not registered for VAT, so there is no VAT to add to any price you see. The price on the screen is the whole price.
Most of Ceteris costs nothing and always will:
You never have to pay to keep a streak, to get a life back, or to carry on playing after a mistake. We do not sell any of that and we are not going to. If you ever see Ceteris offering to sell you something that only exists because the site took it away from you first, we have broken our own rule and you should tell us.
There are three things you can pay for. The prices are shown on the site and in your order confirmation email, and the price you are shown is the total price including any tax.
Payment is handled by Stripe. We never see or store your card details.
When you have paid, we will email you an order confirmation. Keep it — it is also the record of your right to cancel, and it includes a form you can use if you want one.
A monthly subscription renews automatically every month. An annual subscription renews automatically every year. This carries on until you cancel it.
We say this plainly because it is the thing people are most often surprised by. There is no minimum term, so you are never locked in for a number of months. You can cancel whenever you like, including the day after you start.
A one-off series purchase does not renew. There is nothing to cancel and you will not be charged again.
Whichever of these is easiest:
We will not ask you for a reason, and we will not put anything in your way. Cancelling is meant to be as easy as signing up was.
You keep access until the end of the period you have already paid for, and you are not charged again. So if you are on a monthly subscription and you cancel a week in, you keep it for the rest of that month.
If you would rather have the unused part of that period refunded instead of keeping the access, just say so and we will do that. Most people prefer to keep the access, so that is what happens unless you ask.
For 14 days after you buy, you can change your mind and get all of your money back.
This applies whether or not you have used it. If you buy a series, read all of it, and then decide on day 13 that it was not for you, you still get a full refund. We are not going to check how much you read, and we are not going to ask you why.
The law lets a business ask you to give up this right for digital content as soon as you start using it, in exchange for getting access straight away. Some sites put a tick box in front of you to do exactly that. We do not, and we will not. You keep the right in full.
You can still cancel at any time, and you keep what you have paid for until the end of that period. See Cancelling above.
Beyond that, if something has gone wrong — you were charged twice, you were charged after cancelling, the thing you paid for did not work, or you bought the wrong thing — email us and we will sort it out. We would much rather refund you than argue with you.
Refunds go back to the card you paid with. They usually arrive within a few days, depending on your bank. We do not charge a fee for refunding you.
You need to be 18 or over to buy anything on Ceteris.
A lot of the people who use Ceteris are sixteen and seventeen, and that is exactly who it is built for. But the person who pays has to be an adult, and it has to be their own card or their own decision. If you are under 18 and you would like a subscription, that is a conversation to have with whoever would be paying — it is not something you can buy yourself, and nothing on this site will push you to go and ask.
If a payment was made by someone under 18, or made on an adult's card without them knowing, tell us and we will refund it. We will not make you argue the point.
What you buy should be what we described, work properly, and be of a decent standard. That is your right under the Consumer Rights Act 2015 and nothing here takes it away. If it is not, you are entitled to have it put right, or to a refund.
What we cannot promise:
We are responsible for loss we cause you that we could reasonably have expected. We are not responsible for things outside that — for example, if you miss a deadline because the site was down, when the deadline was not something we knew about. Nothing in these terms limits our responsibility for anything the law does not allow us to limit.
Email hello@ceteris.app and tell us what happened. We answer every complaint within 5 working days. If you are not happy with the answer, say so and we will look at it again.
You can also take a dispute to your card provider, or to Trading Standards through the Citizens Advice consumer helpline. Using us first is usually faster, but it is your choice and you do not have to.
You sign in with a link sent to your email address — there is no password to forget. What you buy is attached to that account, so it follows you to another device.
What we store and how to delete it is set out on the privacy page. Deleting your account deletes what we hold about you. If you delete your account while a subscription is running, cancel the subscription too, or tell us and we will.
Please do not share your account, copy the paid modules, or republish them. They took a long time to write.
If we change these terms, the version that applies to you is the one that was on this page when you bought. If we change the price of a subscription you already have, we will email you first and you can cancel before it takes effect.
These terms are governed by the law of England and Wales. If it ever came to a court case, you can bring it in the courts of England and Wales, or in the courts where you live if that is Scotland or Northern Ireland.