Tunenoodle
Most tools do one step and stop. Tunenoodle keeps the whole loop in one place: one line of text, your own lyrics, a photo or a hum becomes a song, and the same studio then extends it, replaces a section, mashes two tracks together, splits it into stems, or turns a script into a voice — so nothing has to leave the app to be finished.
The part you use every day is free: thirteen audio tools — tempo, chords, spectrum, speed and pitch, reverb, trimming and more — open in the browser with no account and no credits, and the audio is processed locally.
The paid side is readable: a generation costs 2 credits and lyrics 1, the price is shown before you commit, one-time packs never expire, and a membership can be cancelled without losing the period you already paid for. The studio is localised in ten languages.