Free tools
Free tools for founders and marketers
Calculators and utilities we built for our own growth work. They run in your browser, need no account, and send nothing anywhere.
Conversion & testing
- Conversion rate calculatorConversions ÷ visitors, the '1 in N' odds, and how many conversions the same traffic needs to hit a target rate.
- A/B test significance calculatorp-value, confidence, uplift and a confidence interval for two variants, using a two-proportion z-test.
- A/B test sample size calculatorVisitors per variant and test duration from baseline rate, minimum detectable effect, power and significance.
- Revenue per visitor calculatorRevenue per visitor and per 1,000 visitors, split into conversion rate × order value, and what extra traffic is worth.
SaaS metrics
- Traffic to revenue calculatorHow many visitors, signups and customers a month you need to reach an MRR goal, with churn included.
- MRR calculatorMRR and ARR from customers and price, a compounding growth projection, months to target and a net new MRR bridge.
- Churn rate calculatorMonthly and annualized customer churn, gross and net revenue churn, GRR and NRR for a subscription business.
- LTV calculatorCustomer lifetime value from price, gross margin and churn, plus average lifetime, LTV:CAC and CAC payback.
Marketing ROI
Marketing
- UTM builderTag one link or a whole CSV with utm_source, medium and campaign. Presets for common channels and warnings for case, spacing and unknown mediums.
- UTM parser & linterPaste a tagged URL to see each UTM value and click ID, and catch uppercase names, spaces, duplicates and missing mediums.
- Referrer channel checkerSee which GA4 default channel (and which VisitTrack channel) a referrer plus UTM combination lands in, with the rule that matched.
- Open Graph previewPreview link cards for X, LinkedIn, Facebook, Slack and iMessage from your og: tags, check image size, and copy the meta tags.
SEO & AI search
- AI crawler robots.txt generatorAllow or block GPTBot, ClaudeBot, PerplexityBot, Google-Extended and 20+ AI bots by purpose: training, AI search or user fetch.
- llms.txt generatorBuild and validate an llms.txt file in the llmstxt.org format: name, summary, link sections and an Optional section.
- robots.txt testerCheck whether a URL is allowed for Googlebot, GPTBot or any crawler, using Google's longest-match rules, and see the deciding rule.
- SERP snippet previewPreview your title and meta description in Google on desktop and mobile, with pixel-width truncation and keyword checks.
- Schema markup generatorGenerate JSON-LD for FAQPage, Article, SoftwareApplication, Organization and Product, validated against Google's required fields.
- User-agent bot checkerClassify a user-agent string as a human browser, search crawler, AI crawler, SEO tool, preview bot or script.
Privacy
See which channels actually bring paying customers
VisitTrack is cookie-free analytics with revenue attribution built in. One script tag, no consent banner, live in two minutes. 14 days free, no card required.