91.

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Across
  1. 2. Elevated area kept by deceased sister with distinction
  2. 4. Pricing model for many apps
  3. 5. WARE Mega-quantity, low-quality computer apps
  4. 6. $0.99, for many apps
  5. 9. Certifications on some college apps
  6. 11. Deliver good energy to elevated area (5)
  7. 13. Elevated area
  8. 14. Many apps
  9. 15. Moved between apps
  10. 17. Elevated area is a huge landmass
  11. 19. "Undo" shortcut in many Windows apps
  12. 21. Platform for many apps
  13. 22. How many apps make money
  14. 23. Like many apps
  15. 24. Flat elevated area
Down
  1. 1. What apps are written in
  2. 3. Elevated area in Athens (9)
  3. 6. Elevated area in Channel Islands yields hot pepper (6)
  4. 7. Golf: elevated area from which the first stroke of a hole is made (3)
  5. 8. STORY Upstairs area of a home
  6. 10. Bribes raised to secure grand area by the sea
  7. 12. Think about one new grand area (5)
  8. 16. Elevated area in reserve with boundaries for beautiful antelope
  9. 18. Still-in-development apps
  10. 20. Method of showing approval on many social networking websites and apps (5)
  11. 22. Majestic area in capital