Terms of use and sale

The website and the software are together the “Service”. If you do not accept these terms, do not use the Service. They are published by Mahé Chadeffaud, entrepreneur individuel trading as Stochastly, 7 rue Marie-Thérèse Hermann, 74000 Annecy, France, SIREN 109 270 363, contact@stochastly.com. The full Legal notice carries the remaining registration details.

Stochastly is desktop research and backtesting software. It composes strategies as a node graph and runs validation on data you supply. An account is required to download the desktop software and to activate it. Features may change through software updates.

Installing the software and starting it forms a contract on these terms, whether or not you are signed in. For a paid plan, a further contract forms when your payment is accepted at checkout. Your plan is then attached to your account, and you activate the app by signing in to that account from the app. The plan you bought, its price and its billing period are those shown at checkout.

No plan is on sale for now: the app is in early access, and prices are coming soon. When plans go on sale, prices will be in euros and the price shown at checkout will be the total you pay us. Where we sell and how taxes apply are set out in the next section. Your bank may add its own currency conversion or foreign transaction fees; those are not ours.

• Starter. Price coming soon; one workstation, up to 10 saved runs and 2 active strategies; validation statistics remain unlimited.
• Atelier. Price coming soon, monthly or yearly.
• Portfolio. Price coming soon, monthly or yearly.
• Assistant + Agents. An optional monthly subscription, price coming soon, including 500 credits per monthly period. Included credits do not roll over to the next period. The option can be added to Starter, Atelier or Portfolio, monthly, including with yearly software, and it is billed and cancelled separately from the software. Starter includes the individual assistant with the option; Research agents and multi-agent sessions require Atelier or Portfolio.
• Credit refill. A one-off purchase, at the rate and within the limits shown at checkout. A refill is never bought automatically.

Renewal. Each subscription renews automatically at the end of its period, a month or a year, at the price then in force, until you cancel it. The checkout states the price, the billing period and the fact that the subscription renews before you pay, and you agree to it by paying. We then email you a confirmation that repeats those terms and explains how to cancel.

Reminders. For a yearly subscription, we email you a reminder between 30 and 45 days before it renews, with the renewal date, the price and how to cancel. At least once a year, we remind every subscriber of the renewal terms and how to cancel. We tell you of any price change 30 days before it applies, and you may cancel before it does.

Cancelling online. You can cancel online at any time, from your account, in the same way you subscribed; you never need to call or write to us to cancel.

We sell plans to consumers and businesses worldwide, except in the countries and regions listed below.

Sanctions and payment-provider restrictions. We do not sell, license or otherwise supply the Service, early access included, to anyone located or ordinarily resident in Belarus, Cuba, Iran, North Korea, Russia and Syria, or in the regions of Ukraine not controlled by its government (Crimea, Sevastopol, and the occupied parts of the Donetsk, Luhansk, Kherson and Zaporizhzhia regions). We do not supply it either to a person or entity named on a sanctions list of the European Union, the United Nations, the United Kingdom or the United States, or owned or controlled by one.

How we tell where you are. We use your IP country and the billing country you provide to check availability. A foreign-issued card alone does not establish where you live or where a sale is taxable. Payment-provider checks may also restrict payments. IP geolocation cannot reliably identify residence, listed persons or occupied territories. If we identify an excluded purchase, we refuse the purchase, or, if it has already gone through, we cancel it and refund it in full. Cancellation and refunds are handled by us; a warning or withheld delivery does not itself refund a payment.

Taxes. We are a French business under the VAT franchise scheme (franchise en base). Where a sale is subject to French VAT, no VAT is charged: VAT not applicable, art. 293 B of the French General Tax Code (CGI). Where a sale is taxable in another country, we charge no VAT, GST or sales tax as long as that country does not require us to register for it, and the price shown remains the total you pay us. If you buy as a business, you may have to account for any tax due in your country yourself, under its reverse-charge rules.

The app is in early access. Anyone can join: create an account, answer five short questions, then download the app. There is no limit on the number of accounts. Early access is free: nothing is charged, and it never turns into a paid subscription.

What you receive. A licence of the app at no charge, with no end date, future versions included, for one computer at a time. You can move it to another computer by releasing the current one from your account. Market data is not included. The account receives 100 assistant credits, offered once at no charge. More credits can be bought from your account, as a credit refill under the sale terms below. Free for life means for as long as Stochastly supplies the software. If we stop, we tell you at least 90 days in advance. If we transfer the Stochastly business, you agree that this contract moves with it, and the buyer must honour your free access unchanged.

What we ask in return. Short written feedback on the app: the first after 10 days, once you have used it on 3 days for at least 90 minutes in total; then every 10 days until the end of your second month; then once a month until the end of your eighth month. After that, nothing is asked. A negative review counts as much as a positive one. Until the feedback screen ships in the app, we ask and you answer by email. Missing feedback never ends your access. We may ask for less, and we will not withdraw the free access because of it.

When early access closes. We announce the end of early access for new accounts at least seven days in advance, on this website. Accounts that joined before the end keep their free access. Accounts created after it buy a plan, after a trial period.

We may suspend or end an early access licence only for the reasons set out in Ending the contract (breach of these terms, a shared account, abuse), after notice and a chance to fix it.

Early access is a contract like a plan: the legal guarantee of conformity applies to it. You can end it at any time by deleting your account; we then delete your answers and stop using your feedback, except in anonymous, aggregated form. If we ever publish your feedback as a review or a testimonial, we ask you first and say that you received free early access.

Trials opened before early access run until their end date, under the terms in force when they started.

As a consumer buying at a distance, you have fourteen days from the contract date to withdraw, under Art. L. 221-18 of the French Consumer Code, except where the law excludes it. You do not have to give a reason.

Plans. The software licence is digital content supplied at once. At checkout, one unticked box asks you to request immediate access and to acknowledge that you lose your right of withdrawal once access starts; we confirm it by email. Once access has started, a plan cannot be withdrawn and is not refunded (Art. L. 221-28 13° of the French Consumer Code). The Assistant + Agents option is a service you ask us to start at once: if you withdraw from it within fourteen days, you pay for the service supplied until then and we refund the rest (Art. L. 221-25). To withdraw from the option, email contact@stochastly.com with a clear statement or the model form below.

Credit refills. A credit refill is a service you ask us to start at once: if you withdraw within fourteen days, we refund the unused credits at the rate of 25 credits per euro and keep the price of the credits you used (Art. L. 221-25 of the French Consumer Code). Once all credits of a refill are used, it can no longer be withdrawn (Art. L. 221-28 1°). You can withdraw online: sign in to your account and, under Plan & billing, click “Withdraw from contract here”, choose the refill, give or confirm your name, the purchase and the email address for the acknowledgement, then click “Confirm withdrawal”. We email you an acknowledgement with its content, date and time. You can also withdraw by email to contact@stochastly.com with a clear statement of your decision, or with the model form below.

When a withdrawal is due, we refund it within fourteen days of receiving it (Art. L. 221-24 of the French Consumer Code), using the payment method you used. Refunds are made by us, never automatically. A refunded plan is revoked and stops granting its edition.

You may use this form to withdraw, by copying it into an email to contact@stochastly.com or by post. Using it is optional: any clear statement of your decision is enough.

• To: Mahé Chadeffaud EI (Stochastly), 7 rue Marie-Thérèse Hermann, 74000 Annecy, France, contact@stochastly.com.
• I hereby give notice that I withdraw from my contract for the supply of the following digital content or service: ______
• Ordered on: ______
• Name of consumer: ______
• Address of consumer: ______
• Signature of consumer, if the form is sent on paper: ______
• Date: ______

We grant you a personal, non-exclusive, non-transferable right, revocable only as set out in Ending the contract, to use the Service for its intended purpose. The Service, its software and its content stay owned by the publisher or its licensors, and no other right is granted.

• One person, one or two computers by plan. Starter and early access cover one personal computer; Atelier and Portfolio cover up to two active personal computers. You move it to another computer by releasing one from your account, up to three releases per 30 days.
• It checks in. The application confirms your plan with our licence endpoint about every 1 hour while it is open. A plan that has ended or been revoked, or a computer released from your account, is refused at the next check.
• Offline use. A plan keeps working offline for up to 3 days after its last successful check, and never past the end of the plan or of the early access. Past that, it stops granting its edition until it reaches the server again, and restores itself on the first successful check.
• The assistant is metered. Assistant + Agents is an optional monthly subscription, price coming soon, with 500 shared credits per monthly period. Included credits do not roll over. A voluntary refill gives credits at the rate shown at checkout, and no automatic top-up applies. Purchased credits remain recorded after cancellation, and become usable again while the software and the option are active.

We are not a broker or an investment adviser, and we provide no recommendation to trade. We hold no client funds and place no order. All trading decisions are yours alone, and trading carries a substantial risk of loss. Please read the Risk disclosure, which forms part of these terms.

• Do not use the Service unlawfully, or to harm, overload or attempt to gain unauthorised access to it.
• Do not reverse-engineer, resell or redistribute the software except as expressly permitted, and except where law grants you that right regardless.
• Do not share your account, or run the software on more computers than your plan allows.
• You are responsible for the data you load and for keeping any credentials secure.

Export controls and sanctions. You must not use, export or give access to the Service in breach of the export-control or sanctions laws of the European Union, the United Nations, the United Kingdom or the United States. You confirm that you are not located or ordinarily resident in a country or region under sanctions listed in these terms, and that you are not a person named on a sanctions list or owned or controlled by one. The software uses only standard encryption, for secure connections and signature checks.

You retain ownership of the data and strategies you bring. The desktop software reads and computes your market data on your machine and does not transmit it to us. The exceptions are described in the Privacy policy: the licence check, the assistant, and the two optional data-sharing boxes of the app's sign-in screen, if you tick them.

Optional data sharing. The app's sign-in screen offers two optional boxes, unticked by default: adding your GO/NO-GO verdicts to our public research counter, and letting us use descriptions of your backtests to train our own models. Accepting these terms does not tick either box. Neither is a condition of these terms, of a plan or of any feature: each rests on your consent alone, which you can withdraw at any time in the app, under Settings, General, Data sharing, where you can also delete what was already sent. A ticked box lets us use what it sends only for the purpose it names, as the Privacy policy describes: the counter is published only as aggregate counts, and the training descriptions are used by us alone, never sold and never shared with a third party. It transfers no ownership of your strategies and gives us no right to your price data, your code or your files.

The assistant is an exception: when you use it, the conversation — which can include your composed graph and the file you have open — is sent to our relay and on to the model provider, Nebius. The assistant is an AI system: its replies are generated by a language model and can be wrong, so check them before you rely on them. Switching the assistant off in Settings stops that. The Assistant + Agents option can be added to Starter, Atelier or Portfolio, monthly, including with yearly software; it is billed and cancelled separately. On Starter it enables the individual assistant; Research agents and multi-agent sessions require Atelier or Portfolio.

Personal data submitted through the website is handled as described in the Privacy policy.

If you are a consumer, the legal guarantee of conformity for digital content and digital services applies to the software, under Art. L. 224-25-12 et seq. of the French Consumer Code. It covers defects present at supply and appearing within two years of it, or, for a subscription, throughout the period we supply it.

Under that guarantee you may ask us to bring the software into conformity, and, where we do not, obtain a price reduction or end the contract. The guarantee costs you nothing, and no clause of these terms limits or excludes it. Your remedies for hidden defects under Art. 1641 et seq. of the French Civil Code stay open to you as well.

Outside the legal guarantee described above, the Service is supplied on an “as is” basis, and we do not warrant that it will be free of interruption or of defect. The software receives updates, and you should keep your own backups of the files it writes.

Stochastly produces estimates from historical data. A backtest result is not a prediction, and we accept no liability for a trading loss, a lost profit, or a decision you take on the strength of an output. To the extent the law permits, our liability for any other loss is limited to the amount you paid us over the twelve months before the event.

Nothing here excludes or limits liability that cannot be excluded or limited by law, including liability for death or personal injury, for fraud, for gross negligence, and for any breach of the legal guarantee of conformity. Where you deal with us as a consumer, any clause of these terms that would reduce your right to compensation for our own failure is treated as unwritten.