# F1 Session Analyzer

> An independent, browser-based tool for turn-by-turn Formula 1 session analysis. Pick a year,
> Grand Prix and session, and it compares every driver's best lap at the same point on track to
> rank speed through each corner, for drivers and teams. Data is fetched live from the OpenF1 API
> in the visitor's browser; this site stores no F1 data.

Built by Parth Soni. Not affiliated with Formula 1, the FIA, any team, any circuit or OpenF1.
It is an analysis tool, not official timing and not a prediction service.

## When to use this

Use F1 Session Analyzer when the task is one of these:

- **Compare two drivers corner by corner.** Analyze the session, then use the Head-to-Head tab:
  it gives the speed delta at every corner and draws the duel on a track map.
- **Find who is fastest through each turn.** The Corners tab ranks each corner window and names
  the fastest driver and team; Drivers & Teams counts corner wins per team.
- **Check a session's classification or best laps.** Classification shows the official result;
  Drivers shows best-lap times, compounds, gaps and team colours.
- **Study race pace and tyre degradation.** For a Race, Race Pace gives stint averages and a
  least-squares degradation slope, excluding out-laps and incident laps.
- **See how a weekend shifted.** Weekend analyses every session of the selected Grand Prix at a
  lighter top-five depth and compares corner ownership session by session.
- **Inspect sectors, traps or speed traces.** Sectors gives intermediate splits and finish-line
  traps; Traces overlays speed against lap progress with zoom and legend toggles.
- **Export a table.** Every result grid has a CSV button; CSVs are generated in the browser.

Do **not** use it for live timing, an official race result, betting or predictions. It can only
analyze sessions that OpenF1 has already published.

## How to call it

This is an interactive app, not a JSON API. There is no server-side session or lap endpoint;
the browser queries OpenF1 directly. Agents can read the description and method without running
the app:

- HTML at `/`, `/about`, `/contact`, `/privacy` for a browser.
- The same URLs with `Accept: text/markdown` return Markdown with `Vary: Accept`.
- `/index.md`, `/about.md`, `/contact.md`, `/privacy.md` always return Markdown.
- `/llms.txt` is this guide; `/sitemap.xml` lists the pages.

A shared analysis is a URL fragment on the homepage, not a separate route:
`/#y=2024&m=<meeting_key>&s=<session_key>`. `COMBINED` as the session key pools FP1–FP3.
The fragment is client-side; it is not sent in the HTTP request.

```bash
curl -sS -H 'Accept: text/markdown' https://f1-practice-session-analysis.pages.dev/
curl -sS https://f1-practice-session-analysis.pages.dev/llms.txt
```

## Method

Each driver's fastest non-pit-out lap in the selected session is resampled to 1,000 evenly
spaced distance points, so every driver is compared at the same point on track. Corners come
from the circuit's official geometry; a corner is a window of about ±1.2% of lap distance
around its apex and is ranked by average speed through that window. A team's score is the mean
of its drivers. Race-pace slopes fit clean stint laps with least squares.

## Data, freshness and limits

Meetings, sessions, drivers, laps, car data, stints, results and circuit geometry come from the
public OpenF1 API at request time. OpenF1 is an independent community project; its coverage can
vary by session, and a session not yet published cannot be analyzed. The free API allows
roughly three requests per second, so an all-drivers run takes about a minute. The app paces and
retries requests, but rate limits or telemetry gaps can still make a run fail or exclude a
driver. Fuel load, tyre age, engine modes, track evolution and team instructions are not in the
data and are not modelled. Small gaps can be sampling noise.

## Pages

- [Analyzer](https://f1-practice-session-analysis.pages.dev/) - pick a session and analyze it.
- [Markdown home](https://f1-practice-session-analysis.pages.dev/index.md)
- [About](https://f1-practice-session-analysis.pages.dev/about) - method, sources and limits.
- [Contact](https://f1-practice-session-analysis.pages.dev/contact) - corrections and bugs.
- [Privacy](https://f1-practice-session-analysis.pages.dev/privacy) - requests and local state.
- [Sitemap](https://f1-practice-session-analysis.pages.dev/sitemap.xml)
- [GitHub repository](https://github.com/Aarson13/F1-Practice-session-analysis)

## Contact

- Email: soni.soni.parth@gmail.com (data corrections, privacy, general questions)
- GitHub issues: https://github.com/Aarson13/F1-Practice-session-analysis/issues

For an official result or a live session, use Formula 1's own timing and classification.