Free tools

Free MarTech Tools for Audits, DNS & Deliverability

A growing suite of free MarTech tools for marketers, builders and ops teams — website audit, DNS health, email deliverability, UTM builder, SERP and social previews, schema markup, API tester and SSL inspector. No login required unless you want to save results.

Marketing Automation & ROI

Build the business case and check your foundations before you automate.

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Marketing Automation ROI Calculator

Model labour recovered and conversion lift to get monthly savings, annual savings, first-year ROI and payback period.

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n8n vs Zapier cost calculator

Turn runs and steps into Zapier tasks versus n8n executions, then see an approximate plan.

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ROAS calculator

Attributed revenue divided by ad spend, plus the break-even ROAS from gross margin.

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LTV calculator

Subscription or repeat-purchase lifetime gross profit, and the LTV to CAC ratio.

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CAC calculator

Marketing plus sales spend, divided by new customers. Optional cost per lead.

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CPM calculator

Cost per thousand impressions, or solve for cost or impressions.

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CTR calculator

Click-through rate from clicks and impressions, or solve either way.

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CPC calculator

Cost per click, plus CTR and CPM when you add impressions.

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Markup calculator

Markup % from cost and selling price, or solve for price or cost. Shows gross margin too.

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Marketing Automation Readiness Assessment

Ten questions on marketing workflows, CRM, data, integrations and manual effort — returns an automation maturity score and the gaps to fix first.

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Marketing Automation Fit Scorer

Does this marketing workflow fit automation? Score one process on volume, error cost, system access and data sensitivity, then get a recommendation.

Website & AI Search

Audit how humans and AI engines see your site.

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Website Audit

7-module audit covering Speed, DNS, SEO, AI Search Readiness, Security, and more.

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AI Search Readiness Checker

12-point GEO/AEO check: llms.txt, sitemap, JSON-LD, FAQ content and other signals AI answer engines read.

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llms.txt + robots-for-AI generator

Paste a domain. Get llms.txt, llms-full.txt and Allow rules for GPTBot, ClaudeBot, PerplexityBot and Google-Extended.

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AI citation / answer-engine preview

URL + query → mock ChatGPT, Perplexity and Gemini answers, plus whether your brand would be cited.

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Title & entity consistency checker

Compare homepage, about, Organization schema, LinkedIn and Knowledge-style names. Flag NAP and brand mismatches.

On-page SEO & Sharing

Preview snippets, social cards and structured data before you publish.

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UTM Link Builder

Build consistent campaign URLs with utm_source, medium, campaign, term and content — copy in one click.

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Campaign UTM auditor

Paste URLs or a GA4/CSV export. Flag mixed-case parameters, missing medium, facebook vs fb, and unreadable campaign names.

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Google Ads offline conversion import validator

Check your offline conversion upload CSV before Google rejects it: headers, Parameters:TimeZone, Conversion Time formats, GCLIDs, currency and duplicates. Runs in your browser.

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Google SERP Preview

Simulate desktop and mobile Google snippets and see where titles and descriptions will truncate.

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Open Graph / Social Preview

Pull og: tags from any URL and preview the Facebook, LinkedIn and X link cards before you share.

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Meta Tag Generator

Generate title, description, canonical, robots, Open Graph and Twitter Card tags to paste into <head>.

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Schema Markup Generator

Copy-paste JSON-LD for Article, FAQ, Organization, LocalBusiness, Product, WebSite and SoftwareApplication.

AI Agents & MCP

Build, test and ship agent integrations.

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MCP Server Tester

Test any public Model Context Protocol server. List tools, inspect schemas, and invoke them instantly.

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Skill Builder

Turn a plain-English agent workflow into a drop-in SKILL.md for Lovable, Claude, or any agent framework.

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GPT Connector Generator

Describe an API or website — instantly get a valid OpenAPI 3.1 schema for a ChatGPT custom GPT Action.

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Public MCP / GPT Action gallery

Install NexaMarTech in ChatGPT or Claude. Ready actions: website audit, AI search score, email DNS, DNS health, SSL.

APIs & Testing

Send requests and inspect what APIs actually return.

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API Tester

A Postman-style HTTP client in the browser — headers, auth, body, response inspection and cURL/fetch/Python export.

DNS & Domain

Diagnose records, mail authentication and certificates.

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DNS Health Checker

Every record for a domain — A, MX, NS, TXT, CAA — plus a scored audit of the misconfigurations that break things.

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Email Deliverability Checker

SPF, DKIM, DMARC, BIMI and MTA-STS audit with copy-paste fixes so Gmail and Outlook trust your mail.

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SSL / Certificate Inspector

Issuer, covered hostnames, expiry countdown, HTTPS redirect and HSTS — before customers see a warning.

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DNS Propagation Checker

Compare answers across six global resolvers to see if your DNS change has actually propagated.

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What Is My IP

Instantly see your public IP address with geolocation, ISP, ASN and timezone. Look up any IP too.

Security & Email

Hardening headers, redirect chains, blocklists and auth records.

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Security Headers Checker

Audit HSTS, CSP, X-Frame-Options, Referrer-Policy, Permissions-Policy, COOP and CORP — with a score and fix tips.

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Email Header Analyzer

Paste raw headers to inspect SPF/DKIM/DMARC results, Received hops, Message-ID and List-Unsubscribe. Client-side only.

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Email Subject Line Length Checker

Count subject line characters, preview where mobile inboxes may cut it, and keep key words within about 40–60 characters.

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Blacklist / RBL Checker

Check a domain or IP against Spamhaus ZEN, Barracuda, SpamCop, SORBS and other DNSBLs that hurt deliverability.

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Redirect & HTTP Status Checker

Follow redirect chains hop by hop — status codes, Location headers, mixed http/https, loops and timing.

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SPF + DMARC Generator

Build copy-paste SPF and DMARC TXT records from mechanisms, policies, rua/ruf and alignment options.

Frequently asked questions

Are these MarTech tools really free?

Yes. Every tool on this hub is free to use in the browser. There is no paid unlock for the public checkers and generators listed here.

Do I need to create an account or log in?

No login is required to run the tools. Sign in only if you want to save or revisit results where that option is offered.

What categories of tools are on this hub?

Seven groups: Marketing Automation & ROI, Website & AI Search, On-page SEO & Sharing, AI Agents & MCP, APIs & Testing, DNS & Domain, and Security & Email.

How do I contact NexaMarTech about findings from a tool?

Use the contact form at /contact?intent=consult with a source that names the tool. Many tool pages also include a Book a Consultation link that pre-fills that intent.

Can I use NexaMarTech tools from ChatGPT or Claude?

Yes for the public MCP / GPT Action gallery. Open the MCP Action Gallery to copy install snippets or OpenAPI fragments for supported public tools.

Do you store the URLs or data I submit?

Browser-only tools (for example header paste and many calculators) keep data on your device. Server-backed checkers send the URL or domain you enter to run the lookup — use sample data if you are testing sensitive properties.

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