What I did as part of the Pricearchive.org service.

- AliExpress price tracker with the largest number of items, pips on price charts, with the oldest database of AliExpress products.
- Price history chart with data from 2016, when an item was on sale for so long. Such items are available.
- Send price drop notifications via email. Setup takes a few seconds.
- Browser extension for Google Chrome (for Opera and Yandex browsers) with many handy tools.
- Search by image. Currently it needs improvement and I'm working on it.
- Package tracking. Available on websites and browser extensions.
- Your own Pricearchive account and several handy tools.
- The backend of the entire service.
- Websites with the above features.