ON vs Isopure vs Naked: same aisle, different Index
Default Compare trio: cheapest $/25g is not the same as Excellent Index.
TLDR
Naked Strawberry leads on $/25g (~$1.87) at Index 77 Good. Isopure Zero Carb Unflavored (95) and ON Gold Standard Double Rich Chocolate (93) clear Excellent at higher $/25g. Read both columns on Compare.
Bottom line
Three powders that show up in the same “whey” shopping tab can disagree on Index /100 and on cost per 25g of protein at the same time. The default trio on WheyIndex Compare makes that concrete:
| Optimum Nutrition Gold Standard 100% Whey, Double Rich Chocolate | Isopure Zero Carb Whey Isolate (unflavored) | Naked Nutrition NAKED Whey (strawberry) | |
|---|---|---|---|
| Index /100 | 93 Excellent | 95 Excellent | 77 Good |
| $/25g | $2.68 | $1.94 | $1.87 |
| Protein / serving | 24g | 25g | 25g |
| Formulation simplicity /100 | 100 | 100 | 100 |
| Sugar / 25g protein | 1.0g | 0.0g | 7.0g |
| Flavor | Double Rich Chocolate | Unflavored | Strawberry |
Checked against live Compare defaults. Prices and scores move with the catalogue; re-pull before you buy.
Naked leads this set on $/25g. Isopure and ON clear Excellent on Index. Sugar is the obvious split: Isopure at 0.0g per 25g protein, ON at 1.0g, Naked strawberry at 7.0g. Inflation and aisle noise are market context; Index is the quality comparison.
Reading each column
Optimum Nutrition Gold Standard, Double Rich Chocolate
- Index 93 Excellent, formulation 100
- $/25g ~$2.68 with 24g protein per serving: highest protein cost in this trio
- Sugar 1.0g per 25g protein
If your only goal is cheapest protein grams among these three today, ON loses the $/25g column. If you want a finished Excellent Index with low sugar per 25g and a flavored Gold Standard scoop, this row gives you both Index and a clear cost trade.
Isopure Zero Carb isolate, unflavored
- Index 95 Excellent
- $/25g ~$1.94
- Formulation simplicity 100, sugar 0.0g per 25g protein, 25g protein per serving
Middle of the pack on protein cost in this check, top of the pack on Index, with zero sugar per 25g on the card. Unflavored means you bring the flavor.
NAKED Whey, strawberry
- Index 77 Good
- $/25g ~$1.87 (lowest in this trio)
- Formulation simplicity 100, sugar 7.0g per 25g, 25g protein per serving
Wins protein cost among these three. Index lands Good rather than Excellent because sugar per 25g sits higher. Cheap per gram and a clean formula are different questions; here formulation clears 100 while sugar pulls the blend down.
Two questions, two winners
Protein cost today: sort by $/25g. Here Naked ($1.87) beats Isopure ($1.94) and ON (~$2.68).
Blended Index (formulation + sugar + value): Isopure 95 and ON 93 clear Excellent. Naked 77 is Good in this snapshot.
Value is only a small slice of Index. A cheap $/25g helps the value component. It cannot erase a high sugar-per-25g figure. Full weights: How the Index works.
So “best” depends which question you asked. Compare exists so you do not flatten both into tub sticker price.
How to reproduce this compare
- Open https://www.wheyindex.com/compare.
- Keep or set the three slots to the products above (or your own finalists).
- Toggle highlight across Index, $/25g, formulation, sugar.
- Share the compare link, or share each Protein Receipt.
Scope
Scores are not for sale. The Index is a comparison model, not a safety assessment and not PDCAAS/DIAAS. Ingredient findings reflect recorded label analysis, not independent laboratory verification. Affiliate links may earn a commission; commission does not change scores.
Value is benchmarked inside the same sales market (US listings in USD today). UK lives at /uk with GBP.