
MailCharts
Panoramata.co
SendView
Hoppy Copy
Validity LLC
Inboxer
Owletter
Competitor email monitoring for e-commerce. See every newsletter your competitors send: when, how often and what they offer. 13,000+ stores followed in Sweden, Norway, Denmark, Finland and Germany.

Create iOS and Android apps with React and Ionic
Website, pricing, platforms and company facts side by side.
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| Website | stackenhance.com | reactionic.github.io |
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| Company | Startup from Sweden · 1 - 9 employees · 2025 | — |
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In their own words, as submitted to SaaSHub.


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: When the brand last emailed How...
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What each product offers, as listed by its team.


Possible disadvantages
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing StackEnhance - Signal and React-Ionic.
StackEnhance - Signal's answer
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
StackEnhance - Signal's answer
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
StackEnhance - Signal's answer
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.
StackEnhance - Signal's answer
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 - Signal's answer
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.
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