How to start a Shelf vs Register Price Mismatch Scanner business: plan and growth
A Guardian investigation found 7-Eleven and Circle K systematically charging more at the register than the shelf price, failing 35% of state price-accuracy inspections in 2023-2025.
An owner can start “Shelf vs Register Price Mismatch Scanner” from a complaint people already posted. The offer, in one line: Snap the receipt and shelf tag; the app spots overcharges and helps file a consumer-protection complaint. It is for shoppers and consumers. Charge a free tier and a paid upgrade, and test a price at no charge to the user. Begin in the United States. Buyers already talk about this in r/povertyfinance. One thread gathered 1328 votes and 29 replies across Sep 14, 2026 – Oct 14, 2026. Use that room to meet the first twenty buyers. Do not export it, and do not republish the posts. The idea, the evidence, and the market estimate on this page are free to read. Two paid prompts finish the job: one drafts the offer, the price, and a ninety-day calendar; the other drafts a month of conversations and proof. One credit unlocks both. A software specification is not on this site. When the company is the product itself, a single link further down opens the founder library.
Guardian investigation: 7-Eleven and Circle K…r/povertyfinance · Sep 14, 2026 – Oct 14, 2026 · 1,328 votes · 29 replies · Open the thread
Who would pay
Shoppers and consumers. Start in the United States, and charge a free tier and a paid upgrade, testing a price at no charge to the user.
The thread above is the public complaint this business can learn from. Verbatim quotes are not invented. Further sources, when a later report adds them, stay with the evidence.
What buyers use today
- Asking the cashier
- State weights and measures offices
The offer, in our words
An app where shoppers photograph the receipt and shelf tag, the system checks for mismatches and helps file a claim or complaint with the state consumer-protection agency.
Score 3.70, Hot. Pain, willingness to pay, demand, and the gap in current options drive it. We are not scoring how fast you can code.
Market size
An estimate, built from the bottom up: real customer counts × a realistic price. It shows the size of the prize, not a forecast.
TAM Total addressable
$144M a year
24M shoppers · 10% of US adults who own a smartphone
SAM Serviceable
$28.8M a year
4.8M shoppers · US, app stores
SOM Obtainable in 3 years
$144K a year
24,000 shoppers · 0.5% of the reachable segment in three years
What that means
24,000 shoppers a year × ~$6 = $144K a year in revenue
Low confidence · estimated Oct 2026
How we estimated this
- Base: 243,000,000 US adults who own a smartphone.
- Has the problem: 10% (assume 1 in 10 check receipts).
- Revenue per shopper: $6 per year (~$6 a year from premium and partners).
- Reachable: 20% (US, app stores).
- Three-year capture: 0.5% of the reachable segment.
TAM is customers with the problem × revenue per customer. SAM is the part a new business can reach. SOM is a cautious three-year share of SAM. The bars use a log scale. A share marked “assume” is our judgment, not a measurement.
The business-plan prompt
The offer, the price, and a ninety-day calendar, written for an agent. 1 credit unlocks both prompts for this idea: this plan and the growth playbook below.
# Business plan prompt: Shelf vs Register Price Mismatch Scanner You are writing a practical plan for one owner who will sell this as a business. Do not write a software specification, a venture memo, or a feature list. Use short sentences. Where a number is unknown, give a range and say what to measure. ## The business Working name: Shelf vs Register Price Mismatch Scanner What the customer gets: Snap the receipt and shelf tag; the app spots overcharges and helps file a consumer-protection complaint. Who pays: Shoppers and consumers
Locked · the first lines are above
Unlock both prompts for this idea · 1 credit ($9.99)
One credit opens the business plan and the growth playbook together, for good. Credits work on both businessideastobuild.com and realstartupideas.com.
Sign in once with your Real Startup Ideas account; the same credits work on both sites.
The growth playbook
Thirty weekdays of conversations and proof. Not an ad plan. Included with the plan above, on the same credit.
# Growth prompt: Shelf vs Register Price Mismatch Scanner You are planning thirty days of distribution for a business that already has an offer. The offer: Snap the receipt and shelf tag; the app spots overcharges and helps file a consumer-protection complaint. The buyer: shoppers and consumers. Price band: at no charge to the user. Do not propose ads, a viral loop, or a rebrand. Propose conversations, proof, and a repeatable weekly rhythm. ## Starting point A public thread in r/povertyfinance drew 1328 votes and 29 replies. The pain, in the owner's words: A Guardian investigation found 7-Eleven and Circle K systematically charging more at the register than the shelf price, failing 35% of state price-accuracy inspections in 2023-2025.
Locked · the first lines are above
Unlock both prompts for this idea · 1 credit ($9.99)
One credit opens the business plan and the growth playbook together, for good. Credits work on both businessideastobuild.com and realstartupideas.com.
Sign in once with your Real Startup Ideas account; the same credits work on both sites.
Questions
How much money do I need to start?
Enough to talk to buyers and deliver the offer once. A service version can start with a written process and a way to take payment. A software version is a larger bet and is not required to test the price. The band to test is Free to the user.
How should I price it?
Test a price at no charge to the user, charged as a free tier and a paid upgrade. Raise it after three paid pilots, not before the first conversation.
Where do the first customers come from?
r/povertyfinance is the clue. A related thread gathered 1328 votes and 29 replies. Show up there, follow the room's rules, and ask for conversations. Do not scrape it.
Do I need to write code?
No. The prompts on this page draft a plan and a month of growth. Code is a later choice. The founder site linked once below is where the build document lives, if you want it.
The founder library has the software specification and a done-for-you build. Have this built
A two-week build starts at $10,000 on that site, after a $1,000 scoping fee.
Plans and growth playbooks
One credit opens both prompts for this business.
The idea, the evidence, and the market estimate stay free. The business plan and the thirty-day growth playbook for Shelf vs Register Price Mismatch Scanner cost one credit, together, and stay unlocked.
Credits work on both businessideastobuild.com and realstartupideas.com. Sign in once with your Real Startup Ideas account; it is the same wallet.