MurmSpy vs PPSPY
These two answer different questions. PPSPY estimates what a store sells, using a server-side model you cannot inspect. MurmSpy reports what a store's own pages prove — and deliberately shows no sales estimate at all.
Short answer
If the number you need is "how much is this store selling", PPSPY is built for that and MurmSpy will not give it to you. If you want the store's actual app stack, theme, pricing structure, best-seller order and release cadence — facts you can verify against the storefront — MurmSpy reports those and labels where each came from.
How to check any of this yourself. Open an extension's
Chrome Web Store page and read the grey permission line under the install
button, or go to chrome://extensions → Details → Site access.
Every permission claim below is taken from the extension's own published
manifest and is visible to you in under a minute. We build one of these
tools, so verify rather than take our word for it.
Side by side
| MurmSpy | PPSPY | |
|---|---|---|
| Sales / revenue estimates | Not offered, by design | Yes — core feature |
| How estimates are produced | — | Server-side, not inspectable |
| Runs on | Shopify + TikTok Shop pages | All websites |
| Where analysis runs | Your machine | Their servers |
| Package size | ~0.24 MB | ~44.2 MB |
| App & theme detection | Yes — free, unlimited | Yes |
| Price/discount analysis | Yes | Yes |
| Change tracking | Yes — watchlist diffs | Yes |
| User base | New, independent | Large, established |
| Price | Free tier + €8.99/mo | Subscription (see their site) |
Where PPSPY is genuinely better
It has a large, established user base and a much broader feature set built around sales estimation, product discovery and market data — none of which a purely local tool can replicate. If sales estimates drive your decisions, no client-side extension is a substitute.
Why MurmSpy shows no sales number
Order counts are not in a public storefront. Any sales figure is inferred from proxies such as best-seller position and publish dates. Those inferences can be reasonable, but they are not measurements, and published comparisons of dropshipping sales-estimate tools frequently show large disagreements between them for the same store.
Rather than add a number we could not stand behind, MurmSpy reports the signals themselves — the store's own best-seller ranking, its discount depth, how many products it published each month — and leaves the inference to you. Every derived figure states its method.
A fair way to use both. Several people run a server-backed tool for discovery and a local tool for verification: get the estimate, then check the store's actual stack, pricing and release rhythm before acting on it. They are not mutually exclusive, and the free tiers make that cheap.
Try MurmSpy
Free tier is permanent. Scoped permissions, no server, no account.