By Billy G. · Founder & Lead EditorVerified May 21 by Billy G.
Ghost Energy Sugar
Ghost Energy Sugar Freevs
Monster Energy Ultra
Monster Energy Ultra
Worth-It Score: 66/100WAIT — WAIT under $3Ghost Energy Sugar Free is solid but not standout — wait for a real discount or a better-aligned alternative.
Verdict: Ghost Energy Sugar Free with 200 mg caffeine and unique flavors per user reports on CNET and Reddit threads, but Monster Energy Ultra wins on widespread availability and slightly lower price. Ghost suits intense sessions while Monster fits everyday use. Both are zero-sugar options with artificial sweeteners.
Ghost Energy Sugar Free lists at $2.99 while Monster Energy Ultra lists at $2.49 — Monster Energy Ultra undercuts Ghost Energy Sugar Free by $0.5 (20%).
How we scored itSpec verificationOwner sentimentLive pricing (4h refresh)Editorial reviewOur methodology →
Winner: Ghost Energy Sugar Free
Ghost Energy Sugar Free: 7.5/10
Monster Energy Ultra: 7/10
Spec-by-spec comparison
Ghost Energy Sugar Free
Monster Energy Ultra
Caffeine
200 mg
140 mg
Calories
5
10
Sugar
0 g
0 g
Volume
16 fl oz
16 fl oz
Ghost Energy Sugar Free
What works
Higher caffeine content for stronger boost
Wide variety of unique flavors
Low calorie with zero sugar
What doesn't
Artificial sweeteners may cause aftertaste for some
Less widely available than major brands
Monster Energy Ultra
What works
Widely available and consistent quality
Smooth taste with multiple classic options
Established brand with reliable distribution
What doesn't
Lower caffeine than competitors like Ghost
Slightly higher calories despite zero sugar
Bottom line
Our pick: Ghost Energy Sugar Free. It edges out the alternative on higher caffeine content for stronger boost. That said, Monster Energy Ultra still wins on widely available and consistent quality — consider it if that single trade matters most for your use.