Privacy policy

Introduction

Our vision is to create applications that are intuitive and easy to understand and use. We feel the same mindset should apply for our privacy policy - so that you as a user will know exactly what data we collect and what we do with it.

This policy covers Amusia on iPhone, iPad, Apple Watch and Mac. We process personal data as per the General Data Protection Regulation (GDPR) and other relevant data protection and privacy laws applicable to us.

Collection of data

Amusia sends anonymous usage events to a third party analytics service called Aptabase, and nothing else about you or your use of it leaves your device. Amusia has no accounts, no ads and no tracking across apps.

An event is sent when you open Amusia, turn on the tuner or the metronome, or change a setting, together with the choice you made - such as the instrument, tuning, scale, key, octave, reference pitch, tempo or theme. When the tuner recognises a note, an event records the note, its octave and frequency, and how loud the sound was. Each event also carries your device's operating system and its version, your language, Amusia's version, and a random session number that Amusia creates on your device and replaces after an hour without use or when it restarts.

We do not collect any device specific identifier such as Device ID, Hostname or Hardware Identifier. Aptabase receives your IP address with each event. It uses it to work out your country and region, and to generate an identifier on the server from a strong hash of your IP Address, User Agent and a strong salt - which differs for each app and is thrown away every 24 hours. It does not store the IP address itself.

This is a common privacy-friendly strategy that makes it impossible for us to correlate sessions that happen on different days or in different apps.

We only use this data to understand how Amusia is used, without identifying the person behind each action. Aptabase processes and stores it within the European Union, for up to 5 years.

You cannot request us to delete your data, simply because it’s impossible to know what data relates to you.

Microphone

Amusia uses the microphone while it listens, to find the pitch of your voice or instrument. The sound is analysed on your device as it comes in, and it is never recorded, stored or sent anywhere. Only the tuning results described above are sent.

On your device

Your settings are kept in Amusia's own storage on each device. They are not synced between your devices, and they are included in your device's backups.

Apple

Apple gives us App Store statistics and, if you have chosen to share them with app developers, crash reports. Apple's privacy policy covers these.

Legal basis and your rights

We process the usage events described above on the basis of our legitimate interest in improving Amusia. You can object to it, or ask us about any of this, through the form below, and you can lodge a complaint with the Swedish Authority for Privacy Protection (IMY).

Contact

Amusia is made by Filip Moberg in Sweden. If you write to us through the form below, your name, email address and message reach us by email through Web3Forms. We use them only to answer you, and we delete them on request.

Changes

We may update this policy as needed to comply with relevant regulations and reflect any new practices.

This document was last updated on October 16, 2026.

Privacy policy

Collection of data

We don't collect any data from Tailfeather ourselves. It contains no analytics or tracking, requires no account, and does not talk to any server of ours. What it keeps stays on your Mac and your paired PCs, as described below.

Your Apple TV

Tailfeather communicates directly with your Apple TV over your local network. The pairing created when you enter the code shown on your TV is stored in your Mac's login keychain and never leaves your device. Your Apple TV shows your Mac's name as the remote, and Tailfeather remembers your TV's network address so it can wake it up.

To show artwork for what's playing, Tailfeather downloads images from the addresses your Apple TV provides, which can belong to the app that is playing. Like any download, the request shows your IP address to the server it goes to, but no other information about you or your usage is attached, and the images are not stored.

What's playing and its artwork also appear in your Mac's Control Center, unless you turn that off. Text you type for your TV is sent straight to it and not stored, and the order you give your TV's apps is saved on your Mac.

Clipboard sharing

When you pair a Windows PC running Tailfeather for Windows, what you copy is sent directly between your paired devices, encrypted end to end. It never passes through a server, and content that password managers mark as private is never sent. Your devices find each other on your local network, and a PC can also connect to an address you enter, such as over a VPN.

Your computers exchange their names when they connect, and while a PC is paired your Mac announces Tailfeather on your local network with its name and its Tailfeather identifier, so your PCs can find it. If a paired device is briefly away, the latest copy waits in memory for up to a minute to reach it.

A copy stays on the computer it arrives on. Tailfeather marks it so that Universal Clipboard doesn't carry it from your Mac to your other Apple devices, and so that Windows keeps it out of clipboard history and doesn't sync it across your devices. Clipboard managers you have installed may still record it, as they would anything else you copy.

On your devices

Your Mac keeps its pairings with your PCs in its login keychain. Your PC keeps its private key in Windows' secure key storage, and the names, network addresses and public keys of your paired Macs in Tailfeather's settings file.

Both apps keep logs to help diagnose problems, with device names, network addresses, pairing events and the time and size of each copy sent. The logs never include what you copy. On your Mac they are part of the system log; on your PC they are in Tailfeather's log folder, which keeps up to 2 MB.

Apple

Apple gives us App Store statistics and, if you have chosen to share them with app developers, crash reports. Apple's privacy policy covers these.

Contact

Tailfeather is made by Filip Moberg in Sweden. If you write to us through the form below, your name, email address and message reach us by email through Web3Forms. We use them only to answer you, and we delete them on request.

Changes

We may update this policy as needed to comply with relevant regulations and reflect any new practices.

This document was last updated on October 16, 2026.

Privacy policy

Collection of data

We don't collect any data from Birdseye ourselves. It contains no analytics or tracking, requires no account, and does not talk to any server of ours. What it fetches stays on your devices and in your own iCloud, as described below.

Your AI services

The Mac app gets your usage from the services you add, signed in as you. API keys you enter are stored in your Mac's login keychain and sent only with requests to the service you added them for - Meshy, OpenRouter, ElevenLabs, or the address you enter for a service of your own. For Codex, Birdseye reads the sign-in Codex keeps on your Mac, once you allow it to open that folder, and uses it only to ask ChatGPT for your plan's limits.

For Claude and Gemini, Birdseye runs a small script that you add to its scripts folder once. The script asks Claude Code and the Antigravity command-line tool for the usage they report, using their own sign-ins, which Birdseye never reads. Neither tool sends a prompt to an AI model for this. Any other script you add to that folder runs on your Mac with your own permissions and the arguments you give it, and Birdseye only reads what it prints.

With a CLIProxyAPI gateway, Birdseye keeps the gateway's management key in your Mac's login keychain and sends it only to the gateway's address. It reads the list of accounts the gateway holds, including their names or email addresses, and asks the gateway to fetch each account's usage from Anthropic, ChatGPT or Google with that account's own sign-in.

Each service receives only the requests needed to report your usage, and its own privacy policy covers what it does with them.

iCloud sync

When your Mac is signed in to iCloud, Birdseye saves the latest usage to your private iCloud database each time it refreshes: the names of your services and accounts - for a gateway, these are often email addresses - how much of each limit is used, balances and credits, when each limit resets, and any error message a service or script reported. Only your own devices signed in to your Apple Account can read it, and we have no access to it. The iPhone and Apple Watch apps and their widgets only read it.

On your devices

Each device keeps the same figures in Birdseye's own storage, so its widgets can show them. Widgets on your Lock Screen and watch face show them while the device is locked, too.

On your Mac, Birdseye keeps its settings - the services, addresses and scripts you add, but not the keys in your keychain - in its own storage, and the latest response from each service in its cache folder to help diagnose problems. A response can include the email address and account ID of the account you signed in with. None of this leaves your devices, apart from iCloud sync and any copy of your settings you choose to export, which never includes your keys.

Apple

Apple gives us App Store statistics and, if you have chosen to share them with app developers, crash reports. Apple's privacy policy covers these.

Contact

Birdseye is made by Filip Moberg in Sweden. If you write to us through the form below, your name, email address and message reach us by email through Web3Forms. We use them only to answer you, and we delete them on request.

Changes

We may update this policy as needed to comply with relevant regulations and reflect any new practices.

This document was last updated on October 16, 2026.