Terms of Use

These Terms of Use ("Terms") govern your use of the website trackcaffeine.com (the "Site") and the CoffeeLog iOS application (the "App"), both published by VAST FLOW. By using the Site or App, you agree to these Terms. If you do not agree, do not use them.

1. What we provide

The Site is a reference about caffeine content and metabolism, including calculators. The App helps you log and visualize caffeine intake. Both are provided for general informational purposes.

2. Not medical advice

The Site and App do not provide medical advice, diagnosis or treatment. Caffeine values are estimates, and calculations use population-average models that may not reflect your individual physiology. Do not rely on them for medical decisions. Consult a qualified professional for any health concern, including during pregnancy or if you have a medical condition.

3. Acceptable use

You agree not to misuse the Site or App, including attempting to disrupt them, scraping at a scale that burdens our infrastructure, reverse-engineering except as permitted by law, or using them to break any law. The downloadable dataset is provided for personal and research use; attribute TrackCaffeine if you republish it.

4. Intellectual property

The Site, the App, their content, design and the TrackCaffeine and CoffeeLog brands are owned by VAST FLOW or its licensors and are protected by law. Except for the openly published dataset, you may not copy or redistribute our content without permission.

5. Subscriptions

CoffeeLog offers an optional paid subscription through Apple's App Store. Billing, renewal and cancellation are handled by Apple under your Apple ID; manage or cancel anytime in your App Store account settings. Prices and features may change with notice.

6. "As is", no warranties

The Site and App are provided "as is" and "as available", without warranties of any kind, express or implied, including accuracy, fitness for a particular purpose or non-infringement. We do not warrant that caffeine values or calculations are error-free or that the services will be uninterrupted.

7. Limitation of liability

To the maximum extent permitted by law, VAST FLOW will not be liable for any indirect, incidental, special, consequential or punitive damages, or any loss arising from your use of or reliance on the Site or App. Where liability cannot be excluded, it is limited to the amount you paid us, if any, in the 12 months before the claim.

8. Third-party services and links

The Site and App rely on third parties (such as Apple, RevenueCat, Google/Firebase and Hetzner) and may link to external sites. We are not responsible for third-party content or practices; their terms and privacy policies apply.

9. Changes

We may update these Terms from time to time. Continued use after changes take effect means you accept the revised Terms. We will update the "last updated" date above.

10. Governing law

These Terms are governed by the laws applicable to VAST FLOW, without regard to conflict-of-law rules, except where mandatory consumer-protection laws of your country of residence apply.

11. Contact

Questions about these Terms: [email protected].

What is this site and which calculators do you offer?

TrackCaffeine is an informational reference and a small suite of calculators that estimate caffeine content and metabolism for common drinks and products; the calculators are tools for education and planning, not clinical dosing. The site publishes an open dataset of drink estimates and provides web calculators for half-life, last cup before bed and simple daily-limit checks.

Dataset is the collection of the published drink entries and their stated milligram values; you can browse the drink index at the drink index and download the dataset at /dataset/. The calculators are available from /tools/ and include a dedicated half-life calculator at /tools/caffeine-calculator/, a last-cup-before-bed planner at /tools/last-cup-before-bed/ and a safe daily limit estimator at /tools/safe-daily-limit/, each of which uses the same published model and dataset entries for its estimates.

The underlying drink numbers are taken from the public DATA on the site, for example Cold brew is listed as 200 mg and drip coffee as 96 mg in the dataset; those entries are editable as the dataset grows and you should verify any specific item on its product page such as Cold brew or Drip coffee. If you want background on how the numbers are chosen, read our method notes on /about/ and report a correction via /contacts.

Is anything on this site medical advice?

No; nothing on the Site or in the calculators is medical advice, diagnosis, or treatment, and you must not rely on the Site for clinical decisions. Consult a qualified health professional for personal medical advice, especially for pregnancy, breastfeeding, cardiovascular conditions or other contraindications where professional care is required.

The regulatory limit most often cited for healthy adults is 400 mg per day, which is provided by the U.S. Food and Drug Administration (FDA) in the source linked here: FDA, 400 mg/day. For research on sleep effects, a controlled study found that 400 mg taken six hours before bedtime cost participants over an hour of sleep, as reported by Drake et al. 2013 (Drake et al., 2013), and that specific experimental result should inform any sleep-related concerns.

How accurate are the caffeine values and the decay model?

All published caffeine values on TrackCaffeine are estimates and the decay model is a population-average approximation; do not use either for clinical or dosing decisions. First-order elimination is the simple pharmacokinetic process we use to model how caffeine leaves the body, and the model assumes concentration falls exponentially with time for a typical adult.

Half-life is the time it takes for the amount of caffeine in the body to fall to half its prior value; we use a population-average half-life of 5.7 hours (342 minutes) in the model. The model formula is: remaining = dose × 0.5^(hours ÷ 5.7), so for a Cold brew entry of 200 mg the arithmetic is: remaining = 200 mg × 0.5^(5.7 ÷ 5.7) = 200 mg × 0.5 = 100 mg (after one half-life), and for Espresso (double) at 126 mg the arithmetic for two half-lives (11.4 hours) is: remaining = 126 mg × 0.5^(11.4 ÷ 5.7) = 126 mg × 0.25 = 31.5 mg.

The decay model is deliberately first-order and simple; individual metabolism varies with genetics, age, pregnancy, medications and liver function, so measured blood or salivary caffeine can differ substantially from model estimates and should be used if precision is required. For more on the assumptions and limitations see our methods at /about/ and try specific comparisons using the side-by-side tool at /tools/caffeine-comparison/.

How can I use the site's content and the open dataset?

You may read and use the Site for personal, educational and research purposes; the openly published dataset is licensed more permissively and is intended for reuse with attribution. CC BY 4.0 is the licence applied to the dataset and it permits copying, redistribution and adaptation provided that appropriate credit is given and a link to the licence is included: CC BY 4.0.

Dataset is the downloadable file on /dataset/ containing the drink entries and their milligram estimates; when you republish or adapt those dataset entries under CC BY 4.0 you must attribute TrackCaffeine and include a link back to the dataset page. If you intend to reuse other Site content beyond the dataset (site copy, layout, branding or images), request permission via /contacts/ or read the notes on permissible use in our /about/ documentation.

What am I not allowed to do with the site or the dataset?

You must not scrape the Site at a scale or frequency that degrades service, republish Site pages wholesale without permission, or present our listed values as laboratory measurements. Presenting our numbers as exact measurements is misleading because the dataset entries are estimates based on public information, manufacturer disclosures and published sources; each listed milligram value in the DATA is an estimate and not a direct assay.

If you need bulk access for research that would otherwise use automated requests, use the dataset download at /dataset/ or contact us via /contacts/ to arrange a cooperative solution; automated scraping that overloads infrastructure is prohibited because it harms other users and increases hosting costs. For factual corrections to a specific drink page such as Espresso (double), submit evidence and a correction request through /contacts/ rather than republishing unverified claims.

What liability limits apply to VAST FLOW for Site and App use?

VAST FLOW’s liability for losses arising from use of the Site or App is limited to the extent permitted by law; where the law does not allow a full exclusion, our maximum responsibility will generally be limited to what you actually paid VAST FLOW in the 12 months before a claim. This is a straightforward cap intended to keep the rules simple for users: if you paid nothing, our financial liability is likely to be nil while other legal remedies that the law requires remain available.

These limits do not reduce any mandatory consumer protections in your jurisdiction and do not affect liability for gross negligence or wilful misconduct where local law forbids limitation; consult local law if you are unsure how these limits apply. If you need broader indemnity or warranties for commercial reuse, contact us via /contacts/ to negotiate a separate agreement.

How do the App-specific terms relate to these Terms?

The App may include platform-specific terms for billing, distribution and refunds that sit alongside these Terms; where the App is distributed through Apple, Apple’s billing rules apply for subscription handling. Subscriptions sold through the App Store are billed and managed by Apple under your Apple ID and Apple’s terms, and you should consult the App Store for refunds and purchase disputes.

Privacy and data-handling for the App are described in our privacy policy, and App behaviour that relies on third-party services (for example analytics or cloud hosting) will be governed by those third parties’ terms as noted on the App pages. If you use both the Site and the App, these Terms and the App-specific notices together define the relationship, and where a direct conflict exists the App platform rules may have primacy for purchases made through that platform.

What law governs VAST FLOW and how are disputes handled?

These Terms are governed by the laws that apply to VAST FLOW’s place of business, subject to any mandatory consumer-protection laws that apply in your country of residence. Where the law requires a different governing law for consumer contracts, that law will govern those aspects despite the stated choice of law.

If you have a dispute about the Site or App, contact us first at /contacts/ so we can try to resolve it informally; formal dispute options will depend on the governing law and mandatory local remedies. Small-claims and local dispute mechanisms available where you live are unaffected and may be used when appropriate.

How will changes to these Terms take effect?

We will update these Terms from time to time and publish the revised text on this page with an effective date; continued use of the Site or App after that effective date signifies your acceptance of the updated Terms. If a change materially reduces your rights, we will attempt to provide advance notice by posting a prominent notice on the Site or by email to registered users when feasible.

For important operational updates—such as calculator model changes or dataset licence clarifications—we will note the change in the methods page at /about/ and, where appropriate, update the dataset file at /dataset/ so downstream users can track differences over time. If you rely on the dataset in production, subscribe to our contact channels listed at /contacts/ for notification of licence- or model-level changes.