Privacy policy
lexter.audio and Lexter 91 · last updated 5 November 2026
Who is responsible
The controller of your personal data is ZAZY s.r.o., V Chaloupkách 82, 252 31 Všenory, Czech Republic · Company ID (IČO) 093 80 663 · VAT ID CZ09380663 · Registered with the Municipal Court in Prague, file C 334594. Contact: [email protected].
In short
This website uses no cookies, no analytics and no tracking. We collect your e-mail address only if you ask to be notified at launch. Purchases are handled by Lemon Squeezy. The Lexter 91 app contacts our licence server only to activate and check your licence, and once a day it looks on lexter.audio for a newer version, which you can turn off. If you use Q, the help assistant on this website, your questions go to OpenAI to be answered.
Visiting this website
Our hosting provider, Cloudflare, processes technical data that every web request contains, such as your IP address, the time and the page requested, to deliver the site and keep it secure. These logs are kept only for a short time. Fonts and images are served from this website. Nothing is loaded from third parties until you start the video.
Q, the help assistant
Q answers questions about Lexter 91 on this website. It is an AI assistant. Your question and the conversation so far are sent to OpenAI, which writes the answer. If you dictate, the recording is sent to OpenAI to be turned into text. OpenAI does not use this data to train its models and may keep it for up to 30 days to detect abuse. We do not store the conversations or the recordings. Your browser keeps the conversation only until you close the tab. To prevent abuse, we count the questions from each IP address for one hour. The legal basis is our legitimate interest in answering your questions about our product (Art. 6(1)(f) GDPR).
If you send your question to Jan, we e-mail the conversation, your note and your e-mail address to Jan so that he can reply to you. We keep this e-mail as long as we need it to deal with your request. The legal basis is your request (Art. 6(1)(b) GDPR).
The video
The video player is loaded from YouTube (youtube-nocookie.com) only after you press play. From then on Google processes data under its own privacy policy.
Launch and early-bird e-mail
If you sign up on lexter.audio, we store your e-mail address and the time of your consent, and send you one e-mail with a link to confirm the address. Addresses that are not confirmed within 7 days are deleted. Confirmed addresses get one e-mail when the Lexter 91 checkout opens, with the early-bird discount code. The legal basis is your consent (Art. 6(1)(a) GDPR).
Every e-mail contains a link that removes your address immediately. You can also withdraw your consent by writing to [email protected]. The list is stored and the e-mails are sent with Cloudflare, our hosting provider. We delete the list no later than one year after launch.
Buying Lexter 91
Lemon Squeezy sells Lexter 91 as our reseller and Merchant of Record. It processes your name, e-mail address, billing address and payment data under its own privacy policy. Lemon Squeezy passes us the order details we need to issue your licence key and give support: your name, e-mail address, order number and the product you bought. Our licence server creates the key and e-mails it to you from [email protected]. The legal basis is the performance of the contract and our legal obligations.
The Lexter 91 app
When you activate a licence, the app sends your licence key, the e-mail address you entered, the name of your Mac and an anonymous identifier of the Mac (a hash of its hardware ID) to our licence server at lexter.audio or zazy.audio, which runs on Cloudflare. The server checks the key and the e-mail and returns a signed licence certificate for this Mac. When the Mac is online, the app checks the licence again about every two weeks. Deactivating sends the licence key and the identifier of the Mac. We keep the key, your e-mail address and your activations for as long as the licence exists, so that you can move it to another Mac and get your key again on lexter.audio/lost-key. The legal basis is the performance of the contract.
Update check in the app
At launch and then once a day, and whenever you choose Check for Updates…, the app downloads lexter.audio/version.json, a small file with the number of the newest version. The request contains no personal data and no identifier of you or your Mac. Like any web request it shows Cloudflare, our hosting provider, your IP address and the app's version. We do not log or evaluate these requests. The legal basis is our legitimate interest in letting you know about fixes and new versions (Art. 6(1)(f) GDPR). You can turn the check off in the app under Lexter 91 › Check for Updates Automatically.
The app stores the start of the trial and your licence on your Mac. It sends no usage statistics and no analytics. Its log files stay on your Mac unless you send them to us yourself. MIDI data goes only to your PCM 91.
Who else receives data
Cloudflare (hosting and e-mail), OpenAI (answers and dictation in Q), Lemon Squeezy and, after you press play, Google (YouTube). Some of them process data outside the EU, with the safeguards described in their own privacy policies. We do not sell your data.
Your rights
You have the right to access your data, to have it corrected or deleted, to restrict its processing, to data portability, to object, and to withdraw your consent. Write to [email protected]. You can also lodge a complaint with the Czech Office for Personal Data Protection (Úřad pro ochranu osobních údajů, www.uoou.gov.cz) or the authority in your country.