About nLight.fit

nLight.fit is a personal fitness and life tracking platform with an AI coach attached to it, built and operated as an independent product under the nLight.fit name.

What it is

The tracking half is deliberately plain: a spreadsheet-style daily ledger where you confirm your day - wake time, training, nutrition, habits, body metrics. The coaching half is not plain at all. It reads that ledger in full, alongside your WHOOP recovery data, your bloodwork, your methylation genetics and everything you have told it in past conversations, and answers questions grounded in what actually happened rather than in general advice.

Between the two sits an analytics layer that runs every night: a correlation engine with partial-correlation controls and multiple-testing correction, changepoint detection, dose-response models, personal records and goal ETA estimates. The design principle is that a number is only worth showing you if it would survive scrutiny - the engine controls its false discovery rate before calling anything a pattern.

Why it exists

Most tracking apps store what you did. Almost none of them can answer the question that actually matters: what is what I'm doing doing to my body? Connecting behaviour to outcome takes a full-resolution record on one side and honest statistics on the other. nLight.fit exists to hold both sides of that connection in one place, and to put a coach on top that cites your own record instead of reciting generic advice.

Principles

• Your data is yours. Full CSV export at any time, account deletion from Settings, and a read-only MCP server so any AI client you already use - Claude, Cursor, or anything speaking the Model Context Protocol - can read your record with your permission.
• Evidence over vibes. Statistical controls are applied before a correlation is ever shown. The analytics documentation explains exactly what is computed and how.
• Honesty about limits. The security page says plainly what is encrypted and what is not, and the docs describe what the platform cannot conclude as carefully as what it can.

The platform today

Signup is open and a free account costs nothing. The platform tracks 59 canonical metrics plus custom columns, integrates WHOOP, bloodwork PDFs and methylation genetics, and exposes the whole record to external AI agents through documented, token-scoped APIs - see the OpenAPI specification and the documentation.

Free covers the entire tracking product and the coach over your last 60 days. Member, at $50/year tax included, is what pays for frontier-model reasoning across a full record - see membership.

For questions or feedback, see the contact page.