Trading strategies tested under identical conditions
Draft. These terms must match the withdrawal policy and the actual billing — particularly on commencement, term and cancellation. Have them reviewed legally before launch.
These terms govern use of Prüfstand, operated by Daniel von Lühmann, Hauptstraße 154, 01833 Dürrröhrsdorf-Dittersbach, Germany (“we”). Deviating terms of the user do not become part of the contract, even if we do not expressly object to them.
Prüfstand evaluates submitted trading strategies against historical price data and issues a verdict. Added to that are publication in the register and, depending on the tier, notification of the forward verdict, the history of your submissions, portfolio computation and the export of the raw data. What a tier covers is set out under Tiers.
The service does not trade. There is no connection to any exchange, no orders are placed and no credentials are accepted. Submitted strategies are descriptions and are never executed.
No particular result is owed. In particular we do not owe a favourable verdict or any given number of passing tests.
How many tests a day and how many markets per test each tier allows is set out under Tiers and forms part of the description of the service.
The two free tiers can be used without entering into a contract for payment; these terms nonetheless govern that use.
For the paid “Workbench” tier the contract is formed when we confirm the order or unlock access. Before the order is placed, the essential characteristics, the total price, the term and the cancellation conditions are displayed.
The Workbench costs 9 € per month including statutory VAT. Billing is in advance for each billing month via Stripe (Stripe Payments Europe, Limited, Ireland). Which payment methods are available there — card, direct debit, PayPal — is for Stripe to determine; no second provider is involved. Invoices are provided electronically.
If the user falls into arrears, we may suspend access to the paid tier after prior notice. The free tiers remain usable.
The subscription runs for one month and renews for a further month unless cancelled before the end of the current period. There is no minimum term.
Cancellation is possible at any time without giving reasons — via the “Cancel contracts here” button under § 312k BGB, or informally by e-mail. The button is permanently available and reachable without signing in; it leads directly to the confirmation form. We confirm receipt without delay by e-mail, stating the time of receipt and the end date, for your records. Access continues until the end date; thereafter the free tier limits apply. The month already paid for is not refunded pro rata — you use it up. It is different if we suspend access: then we refund the unused part (§ 8).
The right of either party to terminate for cause remains unaffected.
Consumers have a statutory right of withdrawal in respect of the paid tier. The details are set out in the withdrawal policy, which forms part of these terms.
The user retains all rights in the strategies they submit. They grant us the non-exclusive right to store and evaluate the strategy and to display the result together with the strategy name, the chosen handle, the attempt counter and the verdict in the public register. This display is part of the service and cannot be switched off. The right lasts as long as the register entry does; a submission not yet evaluated is deleted on request, immediately.
The handle is random by default. The user decides whether to replace it with a name. On request we will replace an already published handle with a random one; the attempt counter is not reset in the process — otherwise this swap would be a way around § 8. The verdict itself remains — a register from which poor results could be removed would be worthless, and the service with it.
The user warrants that their submission infringes no third-party rights.
The following are prohibited in particular: circumventing the daily quotas through multiple handles, addresses or technical means; automated submission at scale; systematic scraping of the register; and any use that disrupts operation.
In the event of serious or repeated breaches we may suspend access. Where access was paid for, we will refund the fee for the unused part of the billing period.
We aim for continuous operation but owe no particular availability. Maintenance is announced where possible. We compute the forward test weekly. Delivering it, however, needs an address: without an account you see the verdict when you revisit your result address — we cannot notify you there. With an e-mail address we write once, as soon as the verdict is settled; on the Workbench every week. Delays caused by outages at the data sources are outside our control.
We are liable without limitation for intent and gross negligence, for damage arising from injury to life, body or health, and under the German Product Liability Act.
For slightly negligent breach of an obligation whose fulfilment is essential to the proper performance of the contract and on whose observance the user may regularly rely, liability is limited to the foreseeable damage typical for this type of contract. Liability is otherwise excluded.
Prüfstand provides no investment advice, no investment broking and no portfolio management within the meaning of the German Banking Act or Securities Trading Act. The evaluations are technical statements about historical data and not a recommendation to acquire, hold or dispose of any financial instrument.
Past results permit no reliable inference about future ones. Anyone trading on the basis of a strategy tested here does so on their own responsibility and bears the risk of loss alone, up to and including total loss.
We will notify changes in text form at least six weeks before they take effect. If the user does not object before they take effect, the changes are deemed accepted; we will point this consequence out separately in the notice. If the user objects, either party may terminate with effect from that date.
Users with no address on file — that is, on the tier without an account — cannot be reached in text form. For them, changes apply from a clearly visible notice on this page; no contract for payment exists there in any case.
German law applies. Mandatory consumer protection provisions of the state in which the user has their habitual residence remain unaffected.
Should any provision be invalid, the remainder of the contract stays in force.
Version: 14 Sep 2026 — day of the last substantive change. The privacy policy carries its own date.