This is Nanologue
Boasting a wide scope of inspiring sounds and professional sound effects, the Nanologue is your first-choice monophonic synthesizer for all things music on iOS. Under the hood, Nanologue boasts a cross-modulation oscillator with two waveforms, glide, a VCF envelope, LFO, delay and a filter section with cutoff, resonance and distortion. With 50 presets the library offers a range of sounds and effects including leads, booming basses and astonishing effects. User presets can be exported to the Retrologue VST instrument, included in Cubase and Cubase Artist.