Terms of use

Version of 15 August 2026

This is the English translation of the German Nutzungsbedingungen, provided for convenience. In case of any discrepancy, the German version governs.

The short version

Use Micyfi for whatever you like — privately or for a living. A paid podcast, a recorded lecture, a commercial production: all expressly allowed.
On as many of your own devices as you want. There is no device count, no licence key and no activation.
Don't hand the software on yourself. Point people at micyfi.com instead, so everyone gets the current build with its licence notices.
Micyfi Pro is bought from Google, not from us. Google is your counterparty for that purchase, and that is also where cancellation and refunds belong.
The Mac receiver is a gift. Software given away carries correspondingly limited liability under German law — section 9 says what that means, and it does not mean we wash our hands of everything.

1. Provider and scope

The provider of the software is Felix Knauff, Kilianstraße 127, 90425 Nürnberg, Germany, fxk3ng@gmail.com ("we"). Further details are in the legal notice.

These terms apply to

Micyfi for macOS (the receiver offered for download on this website),
Micyfi for Android in its free form, and
Micyfi Pro, the one-time unlock of the Android app.

They do not apply to the open-source components included in the software — each of those keeps its own licence, see section 5 — and they are not the purchase contract for Micyfi Pro, which you conclude with Google, see section 4.

2. Rights granted

We grant you a non-exclusive right to install and use Micyfi, unlimited in time and territory. The right is not transferable and may not be sublicensed.

It expressly includes:

installation on any number of devices you own or control,
commercial and professional use, including use in paid productions and services,
unrestricted rights in whatever you record — we acquire no rights of any kind in your recordings.

3. What is not permitted

Distributing, renting, leasing, selling or otherwise making the software publicly available — including unmodified, and including free of charge.
Removing or altering copyright notices, licence notices or attribution.
Circumventing the Micyfi Pro unlock, or distributing a means of circumventing it.

Your statutory rights are unaffected, in particular the right to make a back-up copy (§ 69d UrhG) and the right to decompile in order to achieve interoperability (§ 69e UrhG). Those rights are mandatory; nothing in these terms limits them.

4. Micyfi Pro

Micyfi Pro is a one-time purchase made inside the Android app through Google Play's billing system. There is no subscription and no recurring charge.

Google, not us, is your counterparty for that purchase. Google takes the payment, issues the receipt, accounts for VAT and handles refunds. The Google Play terms of service apply to it. Any right of withdrawal, and the statutory warranty arising from the purchase, exist against Google and are unaffected by these terms.

The unlock is tied to your Google account. It covers all future versions of the app and can be recovered after a reinstall with Restore purchase. Transferring it to a different account is not technically provided for.

What Pro unlocks is described on the product page. What counts is the feature set at the time of purchase; see section 6.

5. Third-party software

Micyfi includes open-source components — among them Opus (BSD-3-Clause) and Oboe, AndroidX, Jetpack Compose, Material Components and libc++ (Apache 2.0). Those parts are governed solely by their own licences, which prevail over these terms to that extent. The full notices are at open-source notices and accompany the Mac download.

Micyfi also requires a virtual audio device, usually BlackHole. BlackHole is an independent open-source project under the GPL-3.0, is not affiliated with us, is not shipped with Micyfi, and is installed by you. Only its own licence and terms apply to it.

6. No obligation to update, support or keep offering it

There is no entitlement to updates, to support, or to Micyfi remaining available. The Mac receiver does not check for updates by itself; new versions are downloaded from this website when you want them.

We may change what future versions do. A version you have already installed is unaffected — it does not stop working because a new one appears.

7. Requirements and limits

Micyfi for macOS requires macOS 12 or newer on a Mac with Apple Silicon; Micyfi for Android requires Android 8.1 or newer. You also need a virtual audio device (section 5) and a connection between phone and Mac over Wi-Fi, USB or Bluetooth.

The current Mac receiver is not signed with an Apple developer certificate. macOS therefore refuses the first launch until you allow the app under System Settings → Privacy & Security. That is described deliberately and is not a defect.

Over Wi-Fi the timing is not measurement-grade. The latency holds steady while the link does, but every dropout steps it by a few milliseconds and it does not come back exactly. For acoustical measurement, use a wire and the Fixed profile. Anyone relying on Wi-Fi timing does so knowing this.

8. Warranty

The Mac receiver and the free Android version are supplied to you free of charge. The law on gifts applies: we are liable for defects in quality or title only where we fraudulently concealed a defect (§§ 523, 524 BGB).

For Micyfi Pro, the statutory warranty arising from the purchase exists against Google as the seller; see section 4.

9. Liability

We are liable without limitation for intent and gross negligence, for injury to life, body or health, for fraudulently concealed defects, to the extent of any guarantee given, and under the German Product Liability Act.

In cases of ordinary negligence we are liable only for breach of a material contractual obligation — one whose fulfilment makes proper use possible in the first place and on whose observance you may regularly rely — and then limited in amount to the foreseeable damage typical for this kind of agreement. Liability is otherwise excluded.

For software supplied free of charge we are in any event liable only for intent and gross negligence (§ 521 BGB).

Back up your own recordings. Micyfi carries audio in real time and is not a recording or archival system; the recording is done by whatever software you select the device in. Securing your data is your responsibility.

This follows the structure German law requires under §§ 307–309 BGB. A blanket disclaimer of all liability would be void against consumers — including when it appears, as it usually does, in an English-language licence.

10. Data protection

What is processed — and above all what is not — is set out in the privacy policy. In short: your audio never reaches us. It goes from the phone straight to your Mac.

11. Term and termination

The right of use runs indefinitely. You end it by deleting the software.

In the event of a serious breach of section 3 we may revoke the right of use with immediate effect; use must then stop and existing copies be deleted. Your claims arising from the purchase concluded with Google are unaffected.

12. Changes to these terms

We may change these terms for future versions of the software. A version you have already downloaded or installed remains subject to the terms in force when you obtained it. A change therefore takes effect going forward, and not retroactively on what you already have.

13. Final provisions

German law applies, excluding the UN Convention on Contracts for the International Sale of Goods. If you are a consumer, the mandatory protective provisions of the country of your habitual residence remain unaffected (Art. 6 Rome I).

Should any provision of these terms be invalid, the remainder stays effective; the statutory provisions take the place of the invalid one (§ 306(2) BGB).

The German version governs. This English translation exists only to be readable.