This page is designed to help you find out whether StackEnhance - Signal is good and if it is the right choice for you.
Know what your competitors send, without subscribing to a single newsletter.
Signal by StackEnhance follows the marketing email of 13,000+ online stores, mostly in Sweden, Norway, Denmark, Finland andGermany, and publishes what it sees as plain facts per brand:
Three ways in, all free
Honest numbers. Signal counts the 100,000+ marketing emails it has actually received. No open rates, no click rates, no estimates. Welcome, birthday and order emails are left out.
Built for the Nordics. Most competitor email tools are US-first. Signal follows the stores that sell in Sweden, Norway, Denmark, Finland and Germany, market by market.
A free account goes further back in time and lets you follow competitors side by side, with alerts when a competitor starts a sale. Team plans on request.
Made by Stack Enhance AB, Sweden.
Listed in
Stores followed
13,000+ online stores, mostly in Sweden, Norway, Denmark, Finland and Germany
Emails captured
100,000+ marketing emails, counted as received (welcome, birthday and order emails left out)
Send frequency
Emails per week per brand, measured over the last 90 days
Latest campaigns
Recent subject lines and send dates for every brand
Send timing
Each brand's busiest send day and hour, in the brand's own time zone
Discounts
Typical discount level, plus alerts when a competitor starts a sale
Market rankings
Which stores email the most in a market or category
Multi-market view
The same brand across its Nordic and German markets, side by side
ChatGPT & Claude
Free read-only MCP server: ask about any brand in plain language, no API key
Chrome extension
See a store's email facts on its own website; sites are matched on your device
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Choose Signal if your competitors sell in the Nordics or Germany: that is where its coverage is, with one page per brand and market. You can start for free without an account (brand pages, the ChatGPT/Claude connector and the Chrome extension), and a free account adds alerts when a competitor starts a sale and side-by-side comparisons. Every number traces back to real emails, de-duplicated, with welcome and order emails left out, so the frequencies you see are the brand's actual marketing sends
TypeScript throughout. Backend: Node.js with Hono, Drizzle ORM and PostgreSQL (Neon), BullMQ queues on Redis, Cloudflare R2 for storage, hosted on Railway. Frontend: React with TanStack Router and Vite, hosted on Vercel. Headless Chrome (Puppeteer) captures landing pages. The ChatGPT/Claude connector is an open-source MCP server (MIT) built with the Model Context Protocol TypeScript SDK
Signal is built for the Nordics. It follows the newsletters of 13,000+ online stores, mostly in Sweden, Norway, Denmark, Finland and Germany, market by market, where most competitor email tools are US-first. It is also the only one you can ask inside ChatGPT and Claude: a free, read-only MCP server answers "how often does Boozt email in Sweden?" in plain language. And it only reports what it has actually received: no estimated open rates, no click rates, no guesses.
E-commerce marketers and email/CRM managers at online stores in the Nordics and Germany who want to know what their competitors send, how often and with which offers. Also agencies that plan email programmes for several retail clients, and analysts researching a market or category.
StackEnhance is a Swedish company from Linköping, founded in 2023. We kept running into the same problem: there was no simple way to see how often a competitor emails, or what they offer, without subscribing to dozens of newsletters and sorting through them by hand. So we built the machine that does it: Signal subscribes to thousands of online stores, reads every marketing email that arrives and turns it into plain facts per brand. The public facts are free, on the web, in ChatGPT and Claude, and in Chrome; the full archive is what the product is for.
We have collected here some useful links to help you find out if StackEnhance - Signal is good.
Check the traffic stats of StackEnhance - Signal on SimilarWeb. The key metrics to look for are: monthly visits, average visit duration, pages per visit, and traffic by country. Moreoever, check the traffic sources. For example "Direct" traffic is a good sign.
Check the "Domain Rating" of StackEnhance - Signal on Ahrefs. The domain rating is a measure of the strength of a website's backlink profile on a scale from 0 to 100. It shows the strength of StackEnhance - Signal's backlink profile compared to the other websites. In most cases a domain rating of 60+ is considered good and 70+ is considered very good.
Check the "Domain Authority" of StackEnhance - Signal on MOZ. A website's domain authority (DA) is a search engine ranking score that predicts how well a website will rank on search engine result pages (SERPs). It is based on a 100-point logarithmic scale, with higher scores corresponding to a greater likelihood of ranking. This is another useful metric to check if a website is good.
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Is StackEnhance - Signal good? This is an informative page that will help you find out. Moreover, you can review and discuss StackEnhance - Signal here. The primary details have been verified within the last quarter. So they could be considered up to date. If you think we are missing something, please use the means on this page to comment or suggest changes. All reviews and comments are highly encouranged and appreciated as they help everyone in the community to make an informed choice. Please always be kind and objective when evaluating a product and sharing your opinion.
