# Tech Stack Checker

> Paste a URL to see the hosting, frameworks, analytics, payments, auth and DNS behind any site linked to the company that runs it.

Canonical URL: https://www.startuphub.ai/tech-stack
Free to use: yes. Publisher: StartupHub.ai

## What it offers

- Detects CDN, hosting, frameworks, CMS, analytics, payments, auth and support tooling from the public site.
- Reads DNS nameservers, TLS and mail authentication records (SPF, DKIM, DMARC).
- Domain-verification TXT records reveal SaaS vendors that never appear in the page HTML.
- Attaches the company behind the domain, with funding and founders, from the StartupHub.ai directory.

## Why it is different

- The checker uses 395 detector signatures across 26 groups.
- Results are joined to a graph of 65M+ company profiles.
- Example: notion.com, captured 27 August 2026, showed Cloudflare CDN, Vercel hosting, Next.js and Tailwind, Cloudflare DNS, SPF, DMARC p=reject and TLS 1.3.
- Priced per scan in credits rather than per seat, and StartupHub Monitor can alert when a company adds or drops a technology.

## How to use it

1. Enter a domain such as example.com.
2. Run the scan.
3. Read the first three detected technologies, free.
4. For the full stack, use a paid plan or the API.

## Inputs and outputs

- Inputs: A domain or URL.
- Outputs: A grouped list of detected technologies and the linked company profile, with three technologies on the free result and the full stack as JSON via the API.

## Limits and plans

- Without an account or card, you get 3 checks a day with three technologies revealed per check.
- On paid plans, daily checks are Pro Mini 15, Pro Lite 40, Pro 100 and Pro Plus 200.
- The API costs 1 credit per domain or $0.001 per lookup with x402, and the Free plan includes 1,500 API credits a month in one pool for REST and MCP.
- Plans and prices: https://www.startuphub.ai/pricing

## API and MCP

| Method | Endpoint | Auth and cost |
|---|---|---|
| GET or POST | `https://www.startuphub.ai/api/v1/companies/technology` | Bearer key, 1 credit; or x402 $0.001 |

MCP server: `https://www.startuphub.ai/api/v1/mcp`
- `scan_company_technology` (API key)

API keys and docs: https://www.startuphub.ai/api-docs

## Related tools

- [API and MCP Security Scanner](https://www.startuphub.ai/api-security): Point it at an API or MCP endpoint and see what it gives a stranger with no credentials, graded A+ to F with a fix for every finding.
- [AI Agent Readiness](https://www.startuphub.ai/agent-readiness): Paste a website, REST API or MCP endpoint and get a 0 to 100 score for AI agent readiness, a letter grade, and a fix prompt for every failed check.
- [Monitor](https://www.startuphub.ai/monitor): Watch any company by its domain and get one digest of what changed, only when something changed, by email, Slack or Teams.
- [All free tools](https://www.startuphub.ai/free-tools)