Calabi
Last updated 8 October 2026
Calabi collects nothing about you. There is no account, no tracking, no advertising, and no Calabi server for anything to be sent to. The music is made on your device, the pictures are drawn on your device, and what you record is saved to your own photo library.
The music in Calabi is generated on your iPhone or iPad while you play: drums, bass and synths are made live, and the one recorded instrument, a grand piano, ships inside the app. Nothing is streamed or downloaded. Calabi does not use the microphone and never listens to you.
The rooms are real-time graphics drawn by your device's GPU. If you connect a TV or projector, Calabi draws the picture for that screen too; nothing about the screen or what's shown on it is stored or sent anywhere.
If you record a room, the video — with the app's own music — is saved to your photo library and filed into an album called Calabi. The app asks permission to add to your library, and to find that album again so everything you make stays together. It does not look at, read or analyse any of your other photos. The videos are yours: they are stored by Apple's Photos app under your own settings, including iCloud Photos if you use it, and Calabi keeps no copy.
The ⓘ → Our other apps page lists our other apps. When you open it, Calabi makes two requests, and these are the only times it connects to the internet:
itunes.apple.com), for
the list of our apps. The request carries only our developer number and
your country's App Store region, so the list shows local prices.polson.app/apps.json), for
how we'd like the list shown: which app comes first, a short headline,
a label such as "New". The request carries nothing at all; it is the
same small file for everyone.Nothing about you or your use of Calabi is sent in either. As with any website, the servers answering each request see your device's IP address in order to send the reply. Our website is hosted by Vercel, which may keep that address briefly in its logs; we don't use it to identify you, track you, or link it to anything else (see Vercel's privacy policy). The list is kept on your device so the page works offline, and tapping an app opens its page in Apple's App Store, under Apple's own privacy policy.
That's the complete list. None of it is transmitted anywhere. You can delete it at any time from ⓘ → Your data in the app, and deleting Calabi removes all of it.
Nothing directly. Calabi contains no analytics, no advertising, no crash reporting service and no third-party software development kits of any kind. Its only network connections are the two requests described under Our other apps, which send nothing about you.
Calabi is bought once from the App Store, with no subscription. Apple handles the purchase; we never see your name, email address or payment details. If you have chosen in your device's settings to share analytics with developers, Apple may give us aggregate, anonymous statistics such as how many people downloaded the app or how often it crashed. We cannot identify anyone from that, and you can turn it off at any time under Settings → Privacy & Security → Analytics & Improvements.
Calabi is not directed at children and collects no data from anyone, of any age.
Under UK and EU data protection law you have the right to access, correct or erase personal data a company holds about you. We hold none, so there is nothing for us to retrieve or delete — but if you want to ask, or if you think this policy is wrong about something, please get in touch and we'll answer.
If Calabi ever changes in a way that affects this policy, we'll update this page and change the date at the top. If a future version were to start collecting anything, we would say so plainly here and in the app before it did.