MarketSizer & Wappalyzer
Wappalyzer tells you what a site is running the moment you look. MarketSizer tells you whose subscription is about to change. Different questions, same toolbar.
“Find accounts by the technologies they use.”
Source: wappalyzer.com homepage
What each tool does well
Wappalyzer
Best known for
A lightweight technographic detection tool best known for its free Chrome extension that reveals what technologies any website is running today.
Useful for
SDRs and marketers doing per-account tech-stack lookups on the fly, or teams building one-off lists by technology filter.
MarketSizer
Best known for
Subscription intelligence - the state of each subscription and when it is likely to change, on top of what is running.
Useful for
GTM teams that need to know when accounts are trialling, switching, renewing or churning specific vendors.
Where Wappalyzer is strong
- One of the most widely-used free Chrome extensions in B2B sales tooling.
- Lightweight, simple UX - reps can look up any single site in seconds.
- Covers thousands of web technologies across CMS, analytics, ad tech, hosting and more.
- Well-priced for teams that only need occasional technographic lookups.
- API and bulk-lookup options for teams that want to run tech-stack filters at scale.
Where they differ
Different jobs on the same pipeline - the overlap between Wappalyzer and MarketSizer is smaller than a feature list suggests.
| Feature | Wappalyzer | MarketSizer |
|---|---|---|
| What each tool tells you | ||
| Which technologies a site is running today | Included | Included |
| When a technology first appeared or was removed | Point-in-time detection | Included |
| Whether a subscription is currently in a trial state | Not included | Included |
| Whether an account is evaluating a competitor | Not included | Included |
| Whether a subscription is approaching renewal | Not included | Included |
| Coverage and depth | ||
| Breadth (technologies indexed) | Thousands of technologies | 200+ vendors deep, expanding across martech |
| Historical subscription-event dataset | Not included | 70M+ records |
| Workflow | ||
| Chrome-extension lookup | Included | Included |
| Side panel in HubSpot, Salesforce, LinkedIn and Apollo | Extension shows the site you are on | Included |
| Free tier | Included | Free trial |
MarketSizer pricing as published at marketsizer.io/pricing. Wappalyzer details as published on their own site and public documentation, last checked 8 August 2026. Spotted something out of date? Tell us and we will fix it.
Where each tool earns its place
Lean on Wappalyzer when
- Your core question is which technologies an account is running right now.
- Fast ad-hoc lookups are the job - one site, one answer, no setup.
- A free Chrome extension covers the whole use case for your team.
- You want the widest possible technographic coverage across many web-technology categories.
Add MarketSizer when
- You need to know when a subscription started and when it is about to change, on top of what is running.
- You want trial, switch, renewal and churn signals attached to each account.
- Signals should surface alongside HubSpot, Salesforce, LinkedIn and Apollo, not in a separate lookup tool.
- You want accounts ranked by an Opportunity Score reps can act on this week.
How MarketSizer works with Wappalyzer
Wappalyzer answers "what does this site run?" the moment you look. MarketSizer answers "whose subscription is about to change?" across the categories you sell into. One is a lens on the account in front of you; the other is a radar on the market around it.
Wappalyzer reads the stack
On any site, Wappalyzer shows the technologies in place - the snapshot of what the account runs today.
Turn lookups into a list
Accounts you shortlist from technographic research come into MarketSizer via CSV import as tracked accounts.
MarketSizer watches for movement
Subscription events - trials, switches, approaching renewals - surface which of those accounts is actually in motion.
Both live in the browser
The MarketSizer Chrome extension opens on any company website, so timing signals sit alongside your stack research as you browse.
What buyers say about the category
Themes from GTM leaders currently evaluating tools in this space.
Sellers keep Wappalyzer pinned to the toolbar for a reason: one click, instant answer, free at low volumes. The buyers we talk to are not looking to replace that. Their follow-up problem starts after the lookup - whether the subscription behind the detected tool is up for renewal, recently churned, or being benchmarked against alternatives - and that is the part a detection extension was never built to answer.
“Technographic tools show me what is installed. What I cannot see is the state of the subscription behind it: is a renewal coming, did they drop something recently, what else have they looked at this year?”
“We have dipped in and out of half a dozen signal sources over the years, none of them consistently. What we want is one place where those signals land already joined up.”
MarketSizer & Wappalyzer - frequently asked questions
How is Wappalyzer different from BuiltWith?
Both are technographic detection tools. Wappalyzer is lighter and better-known for its free Chrome extension; BuiltWith indexes a substantially larger technology catalogue and leans into bulk data. See MarketSizer and BuiltWith, compared, for the same comparison on the wider tool.
Does Wappalyzer detect competitor trials?
Not directly. Wappalyzer sees what technologies are currently deployed. It does not distinguish an active paid subscription from a two-week trial, and it does not alert when a trial starts. That is a different signal category - see How to detect competitor trials.
Can Wappalyzer and MarketSizer be used together?
Yes. Some teams use Wappalyzer for quick ad-hoc tech-stack checks and MarketSizer as the day-to-day account-prioritisation surface. The two are complementary; not a rip-and-replace.
How does Wappalyzer pricing compare with MarketSizer?
Wappalyzer has a free Chrome extension plus tiered paid plans priced per lookup volume, as published on wappalyzer.com. MarketSizer is credit-based (see current plans). Different products; different pricing shapes.
See how MarketSizer works with your Wappalyzer stack.
30 minutes on your accounts, tailored to your ICP. We show which companies are trialling, switching or renewing right now, so you can see whether the timing signal changes what your team does next.
500 credit trial No credit card Live data, not a slide deck
Wappalyzer and all other product names, logos and brands referenced on this page are trademarks of their respective owners, used for identification and comparison purposes only. No endorsement or affiliation is implied.