SimilarTech Alternative: Detect Website Tech Stacks for $9/mo

SimilarTech has been a go-to platform for website technology profiling and market intelligence since the early 2010s. It powers sales teams, competitive analysts, and marketing agencies who want to know what technologies websites are running. But there is one persistent problem: the price tag.

SimilarTech's plans start at $199/month and quickly climb to $499+ for anything beyond basic access. For individual developers, small agencies, and early-stage startups, that is a steep barrier just to answer the question "what tech stack does this website use?"

That is exactly why we built StackPeek — a developer-first tech stack detection API that starts at $9/month with a generous free tier of 100 scans per day. Same core capability, a fraction of the cost.

What Does SimilarTech Actually Do?

SimilarTech is a technology market intelligence platform. At its core, it does three things:

1. Technology detection: Identifies what technologies a website uses (CMS, frameworks, analytics, CDN, hosting, etc.)
2. Market share data: Tracks adoption trends across millions of websites over time
3. Lead generation: Provides lists of websites using specific technologies for sales prospecting

If you are a large sales team running account-based marketing campaigns targeting companies that use Shopify or HubSpot, SimilarTech's market intelligence layer is valuable. But if your primary need is detecting tech stacks programmatically via API — the core use case — you are paying enterprise prices for a feature that can be delivered far more affordably.

SimilarTech vs StackPeek: Feature Comparison

Where SimilarTech wins

SimilarTech excels at market intelligence at scale. If you need historical adoption data ("how many websites switched from Angular to React in 2025?"), curated lead lists by technology, or trend reports for investor decks, SimilarTech has a broader dataset. Their technology fingerprint library covers 1,000+ technologies with historical tracking going back years.

Where StackPeek wins

Price, speed, and simplicity. StackPeek is 22x cheaper for API access. You do not need to speak with a sales team, sign an annual contract, or navigate a complex dashboard. You make one API call and get structured JSON back in under 500ms. For the 90% use case — "tell me what this website is built with, right now" — StackPeek delivers the same answer at a fraction of the cost.

StackPeek also returns confidence scores for each detected technology, so you can programmatically filter results by detection certainty. SimilarTech does not expose confidence data in their API responses.

API Response Comparison

Here is what each API returns when you scan a typical website. Let's use stripe.com as an example.

StackPeek API response

curl "https://stackpeek.web.app/api/v1/detect?url=https://stripe.com"

{
  "url": "https://stripe.com",
  "technologies": [
    { "name": "Next.js", "category": "framework", "confidence": 0.94 },
    { "name": "React", "category": "framework", "confidence": 0.97 },
    { "name": "Cloudflare", "category": "cdn", "confidence": 0.99 },
    { "name": "Segment", "category": "analytics", "confidence": 0.91 },
    { "name": "Google Tag Manager", "category": "analytics", "confidence": 0.95 }
  ],
  "scanTime": 387
}

Clean, flat JSON. Every technology includes a category and a confidence score between 0 and 1. Response time: 387ms.

SimilarTech API response (typical)

{
  "domain": "stripe.com",
  "technologies": [
    { "name": "React", "category": "JavaScript Frameworks",
      "firstDetected": "2019-03-15", "lastDetected": "2026-03-27" },
    { "name": "Next.js", "category": "JavaScript Frameworks",
      "firstDetected": "2021-06-10", "lastDetected": "2026-03-27" },
    { "name": "Cloudflare CDN", "category": "Content Delivery Networks",
      "firstDetected": "2017-01-20", "lastDetected": "2026-03-27" },
    { "name": "Segment", "category": "Analytics and Tracking",
      "firstDetected": "2016-08-05", "lastDetected": "2026-03-27" }
  ]
}

SimilarTech includes historical detection dates, which is useful for tracking technology adoption over time. But notice: no confidence scores, and the response takes 3-5 seconds because it queries their historical database rather than scanning the site live.

Pricing Breakdown: SimilarTech vs StackPeek

At the Starter tier, StackPeek is 22x cheaper than SimilarTech. Even at the Pro level, you are getting 25,000 scans for $29 versus paying $499 for comparable API access with SimilarTech. The per-scan economics are not even close.

When SimilarTech Is Worth the Price

To be fair, SimilarTech is not just a detection API. It is a full market intelligence platform. Here are scenarios where the premium pricing makes sense:

• Enterprise sales teams running ABM campaigns who need curated technology-based lead lists
• Market researchers tracking technology adoption trends over multiple years
• Investment analysts evaluating technology market share for due diligence
• Large agencies that need to monitor technology changes across hundreds of client domains

If you are building reports that say "Shopify's market share grew 12% in the ecommerce space between 2024 and 2026," SimilarTech's historical dataset is the right tool. StackPeek does not offer historical tracking or pre-built lead lists.

When StackPeek Is the Better Choice

For the vast majority of developers and small teams, the core need is simpler: scan a URL, get back the tech stack. Here is where StackPeek is the right choice:

• Indie developers building tools that need tech detection as a feature (e.g., a competitive analysis dashboard)
• Startups doing initial market research without enterprise budgets
• Agencies onboarding new clients who want to understand their current tech stack
• DevTools builders integrating tech detection into their own products
• Security researchers scanning for outdated or vulnerable technologies
• SEO professionals auditing competitor technology choices

If you are spending $199/month on SimilarTech but primarily using it to answer "what framework does this website use?" — you are overpaying by 22x. StackPeek gives you that answer for $9/month or free.

Migrating from SimilarTech to StackPeek

Switching is straightforward. StackPeek's API is a single endpoint with no authentication required for the free tier:

curl "https://stackpeek.web.app/api/v1/detect?url=https://example.com"

If you are currently using SimilarTech's API in a Node.js application, here is how the migration looks:

Before (SimilarTech)

const response = await fetch(
  `https://api.similartech.com/v2/site/${domain}/technologies`,
  { headers: { 'Authorization': `Bearer ${SIMILARTECH_API_KEY}` } }
);
const data = await response.json();
const techs = data.technologies.map(t => t.name);

After (StackPeek)

const response = await fetch(
  `https://stackpeek.web.app/api/v1/detect?url=https://${domain}`
);
const data = await response.json();
const techs = data.technologies.map(t => t.name);

The shape of the response is nearly identical. The main difference is that StackPeek includes confidence scores you can use to filter low-certainty detections. No API key management, no OAuth flows, no SDK installation. Just a URL and a fetch call.

Real-World Use Case: Building a Prospect Research Tool

Let's say you are building an internal tool that lets your sales team look up a prospect's tech stack before a call. With SimilarTech, you would pay $199/month minimum for API access. With StackPeek, you can build and test the entire integration on the free tier, then move to the $9/month plan when you go live.

Here is a quick Python example that scans a list of prospect websites:

import requests
import json

prospects = ["shopify.com", "notion.so", "linear.app"]

for domain in prospects:
    resp = requests.get(
        f"https://stackpeek.web.app/api/v1/detect?url=https://{domain}"
    )
    data = resp.json()
    techs = [t["name"] for t in data["technologies"]]
    print(f"{domain}: {', '.join(techs)}")

Output:

shopify.com: React, Next.js, Cloudflare, Google Analytics
notion.so: React, Cloudflare, Segment, Intercom
linear.app: Next.js, Vercel, Tailwind CSS, Segment

That is it. No API key provisioning, no complex setup. For a sales team doing 50-100 lookups per day, the free tier covers it entirely.

Frequently Asked Questions

Is StackPeek as accurate as SimilarTech?

For the top 120+ technologies that matter most — frameworks, CMS platforms, CDNs, hosting providers, analytics tools, payment processors — StackPeek's detection accuracy is comparable. SimilarTech has a broader fingerprint library (1,000+ techs), so if you need to detect niche or obscure technologies, they have an edge. For mainstream tech detection, both tools produce the same results.

Does StackPeek offer historical data?

No. StackPeek performs live scans and returns what a website is using right now. If you need to track how technology adoption has changed over months or years, SimilarTech or BuiltWith are better options for that specific use case.

Can I use StackPeek for lead generation?

Yes, but differently. SimilarTech provides pre-built lead lists ("give me all websites using Shopify"). With StackPeek, you build your own lists by scanning your target domains and filtering by detected technology. Read our guide on using tech stack APIs for lead generation for detailed strategies.

What about Wappalyzer and BuiltWith?

We have detailed comparisons with both. See our Wappalyzer alternative and BuiltWith vs Wappalyzer vs StackPeek posts for full breakdowns.

The Bottom Line

SimilarTech is a powerful market intelligence platform that justifies its price for enterprise teams doing large-scale technology market analysis. But for the core use case of detecting what technologies a website uses via API, it is dramatically overpriced compared to alternatives.

StackPeek delivers the same core detection capability at 22x lower cost, with faster response times, confidence scores, and a generous free tier. If you are a developer, startup, or small team that needs tech stack detection without the enterprise price tag, give StackPeek a try. The free tier lets you evaluate it with zero commitment.

Related reading: How to detect any website's tech stack with a single API call and Website technology lookup API: the complete developer guide.