Last updated: 4 September 2026
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Important: Microdyno calculates power and torque from acceleration measurements. The figures are estimates, not official measurements. Measurement runs are only permitted where they are legal and safe. Never operate the device while riding.
These terms apply to the Microdyno app for iOS and Android, the web app at app.microdyno.de and the cloud sync (together "the service"). The provider is Stefan Hurzlmeier, Benediktusweg 13, 93049 Regensburg, Germany, e-mail: support@microdyno.de. Deviating terms of the user do not apply. Purchases of sensor hardware are governed by the terms of the respective purchase contract. In case of discrepancies between the German and the English version, the German version prevails.
The service derives power and torque curves from RPM, speed and vehicle data and displays sensor data such as the air-fuel ratio. The app is provided in the form offered in the App Store or on Google Play. Cloud sync and the web app require an account and are currently offered at no additional charge. The provider develops the service continuously and may change features as long as the core function remains available to the user.
An account is created via Sign in with Apple or Google. You must be at least 16 years old; minors need the consent of their legal guardians. The account is personal and not transferable. You are responsible for protecting access to your Apple or Google account and inform us if you suspect misuse.
Power and torque are calculated from physical models and your inputs (weight, gear ratio, frontal area, drag, ambient conditions). Errors in the inputs, wind, gradient, tyre slip and sensor faults directly affect the result. Deviations from a dynamometer are normal. The figures are suitable for comparing your own measurements, not as official, insurance-related or commercial evidence. Lambda and AFR values are readings of the sensor and not an emissions measurement in the legal sense.
Recordings, measurements and vehicle data remain your property. For cloud sync you grant the provider the simple right, revocable at any time by deletion, to store, process and transfer this content to your devices as far as necessary for the service. You warrant that your content, in particular audio and location recordings, does not infringe third-party rights. You are responsible for backing up your data; the app provides export functions for this.
There is no entitlement to uninterrupted availability. Maintenance, faults at third-party providers and further development can cause interruptions; the provider endeavours to keep them short. The cloud features may be discontinued with at least three months' notice; you will be informed in time and can export your data until then. The app remains usable without an account.
(1) The provider is liable without limitation in cases of intent and gross negligence, fraudulent concealment of a defect, assumption of a guarantee, damage resulting from injury to life, body or health, and under the German Product Liability Act.
(2) In cases of slight negligence the provider is liable only for the breach of a material contractual obligation, i.e. an obligation whose fulfilment is essential for the proper performance of the contract and on whose observance you may regularly rely. In this case liability is limited to the foreseeable damage typical for the contract.
(3) Otherwise liability is excluded. This applies in particular to damage arising from using the measured values as a basis for decisions, from riding during a measurement or from improper installation of the sensor, unless it results from a breach of duty by the provider.
(4) In case of data loss, the provider is liable within the limits of the preceding paragraphs only for the effort that would be required for recovery if the user had backed up the data properly and regularly.
(5) The above provisions also apply to the liability of the provider's vicarious agents.
If you culpably breach these terms and third parties assert claims against the provider as a result, you indemnify the provider against these claims including the reasonable costs of legal defence, to the extent you are responsible for the breach.
How we process personal data is described in the Privacy Policy.
You can delete your account at any time in the app or in the browser; this deletes all cloud data. The provider may terminate the contract for the cloud features with four weeks' notice and, in case of serious or repeated breaches of these terms, block the account after a warning or terminate without notice. After termination the cloud data is deleted.
The provider may change these terms where necessary for good reason, in particular because of changes in law or case law, new features or for security reasons. Changes are communicated to you at least four weeks before they take effect, in the app or by e-mail. If you do not object before they take effect, the changed terms apply; the notification points out this right to object and its consequences. Changes that materially shift the balance of performance and consideration require your express consent. If you object, the provider may terminate the contract for the cloud features with the regular notice period.
The law of the Federal Republic of Germany applies, excluding the UN Convention on Contracts for the International Sale of Goods. If you are a consumer, the mandatory consumer protection provisions of the state of your habitual residence remain unaffected. For merchants, the place of jurisdiction is Regensburg. The contract language is German. The provider is neither willing nor obliged to participate in dispute resolution proceedings before a consumer arbitration board (§ 36 VSBG). Should any provision of these terms be invalid, the validity of the remaining provisions remains unaffected.