Flat-Rate vs Credit-Metered AI Audits: Which Pricing Model Fits Your Shopify Store

The two pricing models, explained#

There are two pricing models in this category.

Credit-metered. You get a monthly allowance of credits, and actions spend them. As a concrete, sourced example, SixthShop's plans carry these monthly credit allowances: Free 10 credits, Starter $9.99 for 50 credits, Growth $29.99 for 200 credits, Pro $79.99 for 500 credits, billed in USD with usage-based charges every 30 days. Credit-metered and usage-based billing is common across AI SEO and visibility apps, not unique to any one of them. The shared trait is that your usable volume each month is capped by the allowance, so your effective cost tracks how many products you have and how often you act.

Flat-rate. You pay one monthly price per store and audit as much as you want. ShelfScore is flat: Free $0 for a full store audit, composite score, and top three fixes with no credit card, then Starter $49, Growth $149, and Agency $349 per month. There is no per-product or per-audit charge. You can audit your entire catalog every week and the price does not move.

Structured data sits at the center of all of this. It is among the strongest known signals for AI product visibility, with the strongest evidence for ChatGPT and Perplexity and a more mixed picture for Google AI Overviews. Whatever you pay, you want to be able to check and fix it across your whole catalog without watching a meter. A flat rate lets you do that.

Why credit-metered cost climbs with your catalog#

AI search readiness is not a one-time job. Your catalog changes, AI engines change what they read, and the only way to stay recommended is to keep checking and fixing. That means the real cost of one of these tools is not the sticker price, it is what you pay to audit and fix your whole store, repeatedly, over a year.

Credit-metered pricing collides with that. When each audit, fix, or generation draws down a monthly credit allowance, the work that spends credits scales with your store. The more products you have to cover, and the more often you re-audit and re-fix, the more of your monthly allowance you use. So the merchants who most need to check often, the ones with real catalogs, are the ones most likely to hit the cap, pay for a higher tier, or quietly stop auditing to conserve credits. That last one is the worst outcome, because it means flying blind on the exact thing you installed the app to watch.

What this means in practice. On a credit model, a merchant with a large catalog has to ration: audit fewer products, fix fewer issues, or upgrade tiers to buy more credits. On a flat model, catalog size and audit frequency do not change the bill, so there is no reason to ration the one activity that keeps you recommended by AI.

Cost behavior at catalog scale#

This compares pricing-model behavior, not a head-to-head feature attack. The only competitor numbers used are SixthShop's published monthly credit allowances. No per-action credit-consumption figures are stated, because that rate is not verified.

Credit allowances and per-action costs differ by app and change over time. Check the current allowance on any app's listing and estimate it against your own catalog size and how often you plan to audit.

How to choose for your store#

Pick the model that matches how you will actually use the tool. If you have a small catalog and audit rarely, a credit allowance can be enough and a low entry tier can be cheaper month to month. If you have a real catalog, or you want to re-audit on a schedule, or you manage more than one store, flat-rate removes the cap and the rationing and keeps your cost predictable as you grow.

Frequently asked questions#

What is the difference between flat-rate and credit-metered AI audit pricing? Flat-rate means one monthly price per store with no per-product or per-audit charge, so you can audit your whole catalog as often as you want for the same bill. Credit-metered means each plan includes a monthly allowance of credits, and audits, fixes, or content generation spend them, so your usable volume each month is capped by the allowance.

Why does credit-metered cost tend to climb as my catalog grows? Because the work that spends credits scales with your store. The more products you have to cover, and the more often you re-audit and re-fix, the more of your monthly allowance you use. Stores with large catalogs that check regularly are the most likely to hit the cap, move to a higher tier, or limit how much they audit.

How many products can I audit on a credit plan? That depends on the plan's monthly credit allowance and how many credits each action consumes. Allowances are fixed per tier (for example, SixthShop publishes 10 free credits, 50 on Starter, 200 on Growth, and 500 on Pro). Estimate the allowance against your catalog size and how often you plan to audit before you choose.

Is flat-rate always cheaper than credit-metered? No. If you have a small catalog and audit rarely, a low credit tier can be cheaper month to month. Flat-rate wins when you have a real catalog, want to re-audit on a schedule, or manage more than one store, because the bill does not move with usage.

Does ShelfScore charge per product or per audit? No. ShelfScore is flat-rate per store. The free tier gives you a full store audit, your composite score, and your top three fixes with no credit card and no credits to spend, and paid tiers do not add per-product or per-audit charges.

What should I check before choosing a tool? Check the current pricing on the app's listing, since prices change, and estimate the monthly credit allowance against your own catalog size and audit frequency. If you expect to audit your whole store regularly, weigh that against a flat price that does not rise with usage.

What ShelfScore costs, and why it is flat#

ShelfScore is flat: Free $0 for a full store audit, composite score, and top three fixes with no credit card, then Starter $49, Growth $149, and Agency $349 per month. It is built for the merchant who wants to audit a real catalog regularly without watching a meter. Flat price, whole-store audit, weekly re-audits, score history, and multi-store and agency tiers, all without credits. It checks the three layers AI engines care about, crawler access, schema, and product data, in one composite score, and ranks the fixes with the header showing "Up to +N pts recoverable."

You do not have to take our word for any of it. Run your own audit. The free tier gives you the full store audit, your composite score, and your top three fixes, with no credit card and no credits to spend. The audit starts in under 60 seconds. See your real gaps first, then decide what a fair price is.

Sources#

• SixthShop App Store listing, for the published monthly credit allowances cited above. apps.shopify.com/sixthshop-ai-product-seo-optimizer (fetched 2026-05-30).
• Structured-data evidence tiers: structured data is among the strongest known signals for AI product visibility, with the strongest evidence for ChatGPT and Perplexity and a more mixed picture for Google AI Overviews. ShelfScore does not claim structured data makes a store binary visible or invisible; it identifies the fixable issues most likely to limit AI visibility.