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Pick the best protein-per-dollar yogurt from a shelf photo with Gemini

WorkedEvidence: Described by posterPosted Last checked

HN user skyberrys snaps yogurt shelves and asks Gemini which option wins on protein per dollar while shopping.

Beginner-friendlyNo logins, payments or coding needed. Low risk: paste the prompt and you should get something useful.

How to use this

  1. Tap Copy prompt.
  2. Open Gemini.
  3. Paste it into the message box.
  4. Send it, then read the answer before acting on it.
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A prompt is the message you send to the AI tool. Copy the one on this page, put your own details where it asks, and read the answer before you act on it.

Prompt

Recreated prompt

The source didn't share its exact prompt, so we wrote one from what it describes. The result shown is the source's, not ours.

What the prompt labels mean

The person didn't share their exact words, so we wrote this from what they described. We haven't tested it, and they didn't use this exact version.

I'm in the grocery aisle. Here is a photo of the yogurt shelf with different brands, sale prices, and serving sizes. Which one gives the most protein per dollar right now? Show the math briefly and call out if a label is unreadable.

Try this in:

ChatGPT Gemini Used in sourceGrok Claude

Sends the Recreated prompt shown above. ChatGPT and Grok open with it filled in, and ChatGPT may send it straight away. Gemini and Claude open empty, so we copy the prompt for you to paste. Every button also copies it.

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Optional stronger version

Our rewrite with extra checks. The poster didn't test it.

Before you start, ask me 1–3 short questions about the details below and wait for my answers. Once I've answered, confirm the plan in one line and run the whole task start to finish.

Goal: From my shelf photo, pick the best protein-per-dollar option and show the math.

Questions to ask me first:
- What am I comparing (yogurt, eggs, meatballs)?
- Any brand bans?
- Is unit price on the shelf tag visible?

Inputs (fill in or confirm):
- Photo: [SHELF IMAGE]
- Metric: [PROTEIN PER DOLLAR]
- Bans: [LIST]

Rules:
- Use only readable label numbers.
- Equalize serving sizes before ranking.
- Flag blurry labels instead of guessing.
- I decide what to buy.

Checkpoint: List candidates you can read before ranking.

If you get stuck: If two tags conflict, say so.

Verify before you finish: Top pick cites protein, price, and serving size.

Output: Ranked shortlist with per-dollar math.

Done when: I can grab one tub without doing aisle arithmetic.

AI tool

Gemini

Outcome

While grocery shopping, HN user skyberrys photographs shelves—eight yogurts with different sales and serving sizes—and asks Gemini which has the most protein per dollar. The answers are usually accurate enough to skip hand math on every sale, and the same habit covers meatballs, cereal substitutes, hen-care egg pricing, and a mental price memory for items like Bonne Maman hazelnut spread swinging between $4.50 and $8.50. Claude similarly helped enough on groceries to feel worth a $200 subscription in the poster's framing.

Evidence: Described by posterThe person describes what happened in words, without screenshots or video.

Source

Posted
by skyberrys
Last checked
Method:
How we verify

https://news.ycombinator.com/item?id=47208050

Context: HN date estimated from an '8 months ago' stamp relative to November 6, 2026. Claude mentioned for overall grocery ROI; Gemini is the shelf-photo tool in the example.

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