Privacy Policy

lemmatools does not collect personal data. All calculations run in your browser. We do not require you to create an account, provide your name, email, or phone number to use any tool.

Analytics (Umami): We use Umami, a privacy-first analytics platform, to measure aggregate page views and tool usage. Umami does not use cookies, does not track you across sites, and does not collect personal information. Data is anonymised and used only to improve the product.

Advertising (Google AdSense): We display ads via Google AdSense. AdSense may use cookies to show personalised ads based on your browsing history. You can opt out via Google's Ad Settings or by using a browser with ad tracking protection.

AI explanations (/api/explain): When you click "Get AI Insight", the context string (a summary of your calculation inputs and results) is sent to Anthropic's Claude API to generate an explanation. This context does not include your name, IP address, or any personally identifying information. The response is cached in your browser's sessionStorage and discarded when you close the tab.

• Names, emails, or phone numbers
• Account credentials (no accounts exist)
• Calculator inputs beyond what is sent to /api/explain (and only when you click the button)
• Payment information of any kind
• Location beyond country-level from IP (Vercel infrastructure)

lemmatools itself does not set first-party cookies. Google AdSense may set third-party cookies for ad personalisation. You can disable these in your browser settings or by using an ad blocker.

We use sessionStorage (not cookies) to cache AI explanation responses for the duration of your browser session. This data never leaves your device.

• Vercel

  Hosting & CDN

• Anthropic (Claude API)

  AI explanations — calculation context sent only when you click "Get AI Insight"

• Google AdSense

  Display advertising

• Umami Analytics

  Privacy-first, cookie-free analytics

• ExchangeRate-API

  Live currency rates for Currency Converter

Since we do not collect personal data, there is nothing to retain or delete. Your sessionStorage cache is automatically cleared when you close your browser tab.

lemmatools is not directed at children under 13. We do not knowingly collect any information from children.

We may update this policy if we add features that change data practices. The "last updated" date at the top will reflect any changes. Continued use of lemmatools after changes constitutes acceptance.

Questions about this policy? Email hello@lemmatools.com.