June 2026 · refreshed monthly · 90 prompts across 4 assistants
When shoppers ask an AI assistant "What's the best protein bar to buy?", only a few protein bars brands make the shortlist. In June 2026, across ChatGPT, Gemini, Perplexity and Amazon Rufus, The Whole Truth led with about 51% Share of AI, followed by Yoga Bar and RiteBite Max Protein. The single biggest driver of these recommendations was brand product pages. Here's the full leaderboard.
| # | Brand | ChatGPT | Gemini | Perplexity | Rufus | Share of AI | Trend |
|---|---|---|---|---|---|---|---|
| 1 | The Whole Truth | ● | ● | ● | ● | NEW | |
| 2 | Yoga Bar | ● | ● | ● | ● | ▬ | |
| 3 | RiteBite Max Protein | ● | ● | ● | ● | ▲ 2 | |
| 4 | MuscleBlaze | ● | ● | ◐ | ● | ▼ 1 | |
| 5 | Nourish You | ◐ | ● | ● | ◐ | ▲ 2 | |
| 6 | Quest | ◐ | ◐ | ◐ | ◐ | ▬ | |
| 7 | RXBAR | ○ | ○ | ○ | ◐ | ▼ 1 | |
| 8 | Fabbox | ○ | ○ | ◐ | ◐ | ▲ 2 |
● frequently recommended ◐ sometimes ○ absent
The sources AI leans on when recommending protein bars — this is where Share of AI is won or lost. Show up here and you show up in the answer.
▲ Gaining Share of AI
▼ Losing ground
We run about 90 representative buying prompts for protein bars across ChatGPT, Gemini, Perplexity and Amazon Rufus, then measure how often and how prominently each brand appears, and which sources each assistant cites. Scores are comparable across brands and tracked month over month.
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