# Crosspath — find out if you crossed paths before you met

> Crosspath is a free Android app (Android 10+) that shows where and when you and a friend were close to each other before you met, using only the GPS location and date stored in your photos. Photos are never uploaded; comparison happens on the device between two people who exchange codes.

URL: https://www.mypetsing.com/crossed/

## Answer
Yes, you can find out if you crossed paths with someone if you both have geotagged photos. Crosspath groups photos into trips (25 km / 24 h), compares trips with a friend's code, and labels each match:

| Level | Distance | Time window |
|---|---|---|
| Strong crossing | ≤ 150 m | ≤ 24 h |
| Same place | ≤ 500 m | ≤ 36 h |
| Same district | ≤ 3 km | ≤ 7 days |
| Same city | ≤ 25 km | ≤ 30 days |

Confidence = 0.55 × distance + 0.35 × time + 0.10 × evidence. A crossing indicates proximity, not a confirmed meeting.

## How it works
1. Scan: the app reads only latitude, longitude and capture time (EXIF) on the phone.
2. Share a code: rounded points (~200 m) and dates, no images.
3. See crossings on a map and in the animated Time Tunnel story.

## Privacy
- No photo upload, no server, no background location tracking.
- Mutual only: nobody can look you up.
- Pause, city-only mode, delete everything.

## FAQ
### How can I find out if I crossed paths with someone before we met?
Compare where and when you both took photos. Most phone photos store GPS coordinates and a timestamp (EXIF). Crosspath reads only that metadata on each phone, groups photos into trips, and compares the trips of two people who exchanged codes. If you were in the same city, district or place at around the same time, it shows the crossing with a confidence level.

### Does Crosspath upload my photos?
No. Photos never leave the phone. The app reads only latitude, longitude and capture time from photo metadata. There is no server: comparison happens on the device, using a code your friend sends you that contains rounded (about 200 m) points and dates — no images, no names of places you did not visit together.

### Is Crosspath free?
Yes. Scanning, the personal map, adding friends by code and Time Tunnel stories are free. An optional Crosspath+ subscription adds extra precision levels, group constellations and exports without a watermark.

### How accurate are the crossings?
Every crossing has a level and a confidence score. Strong crossing: within about 150 m and 24 hours. Same place: within 500 m and 36 hours. Same district: within 3 km and 7 days. Same city: within 25 km and 30 days. Confidence = 0.55 × distance score + 0.35 × time score + 0.10 × evidence score. A crossing means your photos were close — it does not prove you actually met.

### Can someone track me with Crosspath?
No. There is no background location tracking, no public map and no search by phone number. A person sees crossings with you only if you personally sent them your code, and you can pause comparison, restrict results to city level, remove a friend or delete all data at any time.

### What if my photos have no location?
Crossings need geotagged photos. Turn on “Save location” in your camera app for new photos. Photos received in messengers usually have location stripped. You can try the app with built-in demo data first.

### Is there an iPhone version?
Crosspath is built for Android 10 and newer. Codes are plain text, so the format is ready for other platforms later.

### What is Time Tunnel?
An animated story of one crossing: two lines — your path and your friend’s — converge at one point, then show the city, month and approximate distance, and how long before you met it happened. You can share it as a card.

## Guides
- [How to find out if you crossed paths with someone before you met](https://www.mypetsing.com/crossed/guides/have-we-crossed-paths-before.html)
- [How to see where your photos were taken on a map (Android)](https://www.mypetsing.com/crossed/guides/photo-location-map-android.html)
- [Русская версия](https://www.mypetsing.com/crossed/ru/)