It uses webblast provided by NCBI and the engine is legacy blast.
Here is an interface with the latest blast+ in the background.
The score matrix and gap penalty are different, so the evaluation is tougher and the results are less
https://inewt.nibb.ac.jp/blastplus/
It has minimal functionality, but you can try it if you like.
This blast+ ui is distributed here. It is a small flask app!

Choose program to use and database to search:

Program Database

Enter sequence below in FASTA format

Or load it from disk

Set subsequence: From         To

The query sequence is filtered for low complexity regions by default.
Filter Low complexity Mask for lookup table only

Expect    Matrix Perform ungapped alignment

Query Genetic Codes (blastx only)

Database Genetic Codes (tblast[nx] only)

Frame shift penalty for blastx

Other advanced options:     

Graphical Overview    Alignment view
Descriptions    Alignments Color schema