Spark EDGE uses the same app as the regular Spark app, but it comes with additional proprietary features unique to Spark EDGE. These include new effects and presets tailored for vocals, acoustic guitar, and bass. Spark EDGE also features two DSP-capable inputs (Input 1 & Input 2) and a mixer view for enhanced versatility.
See also:
Spark App System Requirement
What new effects are included?
Spark Amp & Effect List