# Development > **Note**
> The following page is based on version `1.0.0` of BrickTracker. The application is written in Python version 3. It uses: - `flask` (Web framework) - `flask_socketio` (Socket.IO: Websocket library for real-time client-server communication) - `flask-login` (Lightweight Flask authentication library) - `sqlite3` (Light database management system) - `rebrick` API (Library to interact with the Rebrickable.com API) ## Running a local debug instance You can use the [compose.local.yaml](../compose.local.yaml) file to build and run an instance with debug enabled and on a different port (`3334`). ``` $ mkdir local $ docker compose -f compose.local.yaml build [+] Building 0.6s (10/10) FINISHED docker:default => [bricktracker internal] load build definition from Dockerfile 0.0s => => transferring dockerfile: 211B 0.0s => [bricktracker internal] load metadata for docker.io/library/python:3-slim 0.4s => [bricktracker internal] load .dockerignore 0.0s => => transferring context: 307B 0.0s => [bricktracker 1/4] FROM docker.io/library/python:3-slim@sha256:23a81be7b258c8f516f7a60e80943cace4350deb8204cf107c7993e343610d47 0.0s => [bricktracker internal] load build context 0.0s => => transferring context: 9.02kB 0.0s => CACHED [bricktracker 2/4] WORKDIR /app 0.0s => CACHED [bricktracker 3/4] COPY . . 0.0s => CACHED [bricktracker 4/4] RUN pip --no-cache-dir install -r requirements.txt 0.0s => [bricktracker] exporting to image 0.0s => => exporting layers 0.0s => => writing image sha256:5e913b01b10a51afae952187a45593d4c4a35635d084c8e9ba012476f21b2d0b 0.0s => => naming to docker.io/library/bricktracker-bricktracker 0.0s => [bricktracker] resolving provenance for metadata file 0.0s $ docker compose -f compose.local.yaml up -d [+] Running 2/2 ✔ Network bricktracker_default Created 0.4s ✔ Container BrickTracker Started 11.2s ``` You should have the app available on port `3334` (not `3333`!). For instance at http://127.0.0.1:3334.