Similarity Python Packages

recordlinkage

A powerful and modular toolkit for record linkage and duplicate detection in Python

strsimpy

A library implementing different string similarity and distance measures using Python.

strsim

A library implementing different string similarity and distance measures using Python.

dists-pytorch

IQA: Deep Image Structure and Texture Similarity Metric

iscc-core

ISCC - Codec & Algorithms

cbrkit

Customizable Case-Based Reasoning (CBR) toolkit for Python with a built-in API and CLI

bblean

BitBIRCH-Lean, a memory-efficient implementation of BitBIRCH designed for high-throughput clustering of huge molecular libraries

nxontology

NetworkX-based Python library for representing ontologies

tversky

Differentiable Tversky similarity layers for PyTorch. Official implementation from the ICLR 2026 paper "Tversky Neural Networks."

text2vec

text2vec, text to vector. 文本向量表征工具，把文本转化为向量矩阵，实现了Word2Vec、RankBM25、Sentence-BERT、CoSENT等文本表征、文本相似度计算模型，开箱即用。

difpy

difPy - Python package for finding duplicate and similar images

iscc-sdk

ISCC - Software Development Kit

html-similarity

Compare html similarity using structural and style metrics

agent-convergence-scorer

CLI and Python library for lexical stability checks on repeated short agent outputs: pairwise exact agreement, token overlap, divergence point, and an order-independent score. Zero runtime dependencies.

unisim

UniSim is a package for efficient similarity computation, fuzzy matching, and clustering of data.

closely

Python library for finding the closest pairs in an array

mhcxgraph

A Python package for detecting potential T cell receptor cross-reactivity based on peptide–MHC structures

similarities

Similarities: a toolkit for similarity calculation and semantic search. 相似度计算、匹配搜索工具包，支持亿级数据文搜文、文搜图、图搜图，python3开发，开箱即用。

rltk

Record Linkage ToolKit (Find and link entities)

shapesimilarity

:chart_with_upwards_trend: The package allows you to check the similarity between two shapes/curves, using Frechet distance together with Procrustes analysis.

goombay

Python implementation of several sequence alignment algorithms such as Waterman-Smith-Beyer, Gotoh, and Needleman-Wunsch intended to calculate distance, show alignment, and display the underlying matrices.

equate

Match pip install names and import names

pysimilar

A python library for computing the similarity between two strings (text) based on cosine similarity

copy-spotter

Make plagiarism detection easier. This script will find similar sentences between given files and highlight them in a side by side comparison.