TB Spectrogram is a powerful app that allows users to view a real-time spectrogram of the incoming audio signal on their iPhone. Developed by Dirk Breebaart, this app takes the spectrogram feature from their popular dynamics compressor plugin and offers it as a standalone app, AUv3 plugin, and IAA plugin.

The app captures the microphone input and processes the signals in real time. It can also be used as an AUv3 plugin in compatible host apps like Steinberg Cubasis, Apple Garageband, Audio Evolution Mobile Studio, Auria, AUM, and more. With its variable sensitivity, users can adjust and improve the visuals according to their preferences. The app is also fully resizable as an AUv3 plugin and offers different color themes for the user interface.

Key features of TB Spectrogram include a start/pause button, max screen support in Garageband, legacy Inter-App Audio (IAA) support, and optimization for iPad, iPhone, and iPod Touch. Please note that Inter-App Audio (IAA) can only use one instance of this app simultaneously, so it is recommended to use an AUv3 host to use multiple instances. Additionally, licenses acquired for this platform are not compatible with other platforms. Audio Unit (AUv3) extensions require an iPad mini 2, iPad 4, or later models.

Overall, TB Spectrogram is a versatile and user-friendly app that provides users with a real-time spectrogram view of their audio signals. Whether you're a musician, sound engineer, or just someone interested in visualizing audio, this app is a valuable tool for analyzing and understanding the frequency content of your audio recordings.