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.

dists-pytorch

IQA: Deep Image Structure and Texture Similarity Metric

strsim

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

nxontology

NetworkX-based Python library for representing ontologies

iscc-core

ISCC - Codec & Algorithms

cbrkit

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

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。

bblean

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

iscc-sdk

ISCC - Software Development Kit

html-similarity

Compare html similarity using structural and style metrics

difpy

difPy - Python package for finding duplicate and similar images

unisim

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

tversky

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

simmetry

Similarity scores for strings, vectors, points, and sets with a NumPy-first API.

nlpbrl

The NLPbrl wrapper API is a package for wrapping The Rosette Text Analytics API's functions. It can use natural language processing, and machine learning to analyze unstructured and semi-structured text in multilingual. It can provide a large number of powerful text analyses which has largely helped people to learn about natural language processing

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.

iscc-usearch

Scalable approximate nearest neighbor search for variable-length binary bit-vectors.

sentence2vec

文本相似度（匹配）计算，提供Baseline、训练、推理、指标分析...代码包含TensorFlow/Pytorch双版本

pytorch-cka

The Fastest, Memory-efficient Python Library for layer-wise similarity computation between neural network models

pysentence-similarity

PySentence-Similarity is a tool designed to identify and find similarities between sentences and a base sentence, expressed as a percentage 📊.

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。

copy-spotter

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