A free, local-first alternative to SimilarTech
Technographics-and-leads platform from the makers of SimilarWeb — sales data dressed as a technology detector.
Founded 2014 · Pricing: Limited free preview; paid SaaS tiers with per-seat and per-lookup volume pricing aimed at B2B sales and marketing teams.
Overview
SimilarTech is the technographic-data arm of the SimilarWeb family. Like BuiltWith, it's built for sales, RevOps and competitive-intel teams, not for developers. The product is a database of domains with attached technology profiles, surfaced through a search-and-filter UI that resembles a CRM more than a technology detector. The 'detector' framing is marketing; the real product is 'lead lists by installed technology'. SimilarTech is competent at what it does for its target customer, and mostly irrelevant to a developer looking at one page in their browser.
History
SimilarTech spun out of the SimilarWeb ecosystem around 2014, leveraging SimilarWeb's crawl infrastructure and domain dataset to build a technographic overlay. It has always been closed-source, always been paid, and always been aimed at enterprise sales motion. Feature development over the years has concentrated on CRM integrations, ideal-customer-profile filtering, and market-share analytics rather than on deeper per-page technology detection.
Who uses it and for what
Sales teams use SimilarTech to build campaign lists: every domain running a specific combination of technologies, filtered by company size, industry, geography. Marketing teams use it to estimate addressable markets and track competitive adoption. Strategy teams use it for quarterly market-share reports. Developers very rarely show up in the customer base.
Pricing in detail
What SimilarTech does well
Deep technographic dataset
For the domains SimilarWeb has crawled (tens of millions), SimilarTech carries a rich technology profile including historical usage, estimated spend and company-level metadata.
Lead-list product
Filter 'every SaaS running Stripe + Segment + Intercom in the US with more than 50 employees' and export the list. Genuinely useful for sales workflows.
Market-share dashboards
Category-level market share over time is a real differentiator for strategy and research teams.
Enterprise-grade integrations
CRM, MAP, data warehouse and BI integrations are production-ready rather than afterthoughts.
Where SimilarTech falls short
These are the gaps a developer-first, sourcemap-aware workflow cares about.
Not a developer tool
The per-site output is categorical and shallow. If you open a domain page in SimilarTech looking for 'what exactly does this site run?', you get a sales-flavoured view that's several steps less detailed than Wappalyzer's free extension.
No per-browser presence
There's no browser extension. Everything happens on the SimilarTech web app against their crawl database.
Cannot see authenticated / internal apps
Crawl-only architecture. Your staging, your internal admin, your localhost are invisible.
Expensive by developer standards
Entry pricing is in the hundreds-of-dollars-per-month range; useful features are in the four-figure tier. Not a casual buy.
No sourcemap reading, no version extraction
Same blind spot as the rest of the category. Library names at best, no versions.
Where Sourcemap Explorer wins
Not across the board — we don't run bulk API queries and we don't publish market-share dashboards. These are the things we do that SimilarTechdoesn't.
The page you're on, not a database snapshot
Sourcemap Explorer analyzes the live page you just loaded. SimilarTech returns whatever it last crawled, which can be weeks or months old.
Developer-grade output
Bundled library list, exact versions from `package.json`, WordPress plugin slugs, framework runtime internals. Not a sales profile.
Works on your own internal apps
Staging, logged-in, localhost, preview deployments — all visible to Sourcemap Explorer and all invisible to SimilarTech.
Free
No per-seat pricing, no lookup quotas, no enterprise-sales cycle.
A concrete workflow example
You're on the engineering team of a SaaS product and you want to understand a specific competitor's current frontend stack. SimilarTech's page on that competitor tells your sales team their company profile and the big technologies they use. It doesn't tell you whether they upgraded to React 19 last quarter or whether their checkout uses Stripe Checkout versus Stripe Elements. Sourcemap Explorer, opened while browsing their product, will surface both.
Which one should you use?
Migration notes
Not a migration — they solve different problems. Developers previously pushed into SimilarTech because 'the sales team has access' will find Sourcemap Explorer gives a much better per-page answer and costs nothing.
FAQ
Can Sourcemap Explorer replace SimilarTech for sales prospecting?
No. We don't have a domain database or lead-list product. If you need 'every site running X in country Y', you need a crawl-database SaaS — SimilarTech, BuiltWith or Wappalyzer API are the reasonable options.
Does SimilarTech ever give developer-useful data?
Occasionally. The technology timeline on a domain page can show you when a site swapped frameworks, which is interesting if you happen to have access. But the depth is thinner than what a free browser extension can give you on the live page.
Other alternatives to compare
Try Sourcemap Explorer on the next site you study.
Install the extension, browse normally. When a site exposes sourcemaps, the toolbar icon turns green — click it and you'll see the full project tree plus the detected stack, with exact versions.