i39 vs Spectroid

i39

Office & Productivity

i39 is an open-source desktop app designed as an alternative to Microsoft OneNote. It allows users to take notes, manage documents, create to-do lists, sketch ideas using a drawing pad, and organize notes into multiple notebooks. i39 focuses on flexibility, security, and privacy.

Spectroid

Audio & Music

Spectroid is an audio spectrum analyzer application for Android. It features a real-time spectrogram, waveform, and octave, semitone & cent indications. It is designed for tuning musical instruments, checking audio system responses, and analyzing room acoustics.