Splink

6.9easy start · #5 of 25
in Identity Resolution Software

Free to practise onyes
Free trialnot on record
Well documentedyes
Runs where you workyes

Runs on Linux, Mac, self-hosted, Windows.

Splink is ranked #5 of 25 in identity resolution software on The Geeks Club. It runs on Linux, macOS, Self-hosted, Windows. There is a free plan.

Splink plans and pricing

All plans

Splink Free Open-source Python package · install via pip or conda github.com · 29 Sept 2026

Compared on identity resolution software

Free plan: Yes
Matching approach: hybrid
Real-time API: Yes
Batch file import: Yes
Organization matching: Yes

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The record

Purpose: Splink is a Python package for probabilistic record linkage that deduplicates and links records without unique identifiers.
Method: Its core linkage algorithm is based on the Fellegi-Sunter model and can be trained without labeled data using an unsupervised approach.
Matching: It supports term frequency adjustments and user-defined fuzzy matching logic.
Scale: The maker says Splink can run on DuckDB or big-data backends such as Spark for linkages of 100+ million records.
Backends: The documented SQL backends include DuckDB, Spark, SQLite, and PostgreSQL; the library generates SQL for a user-chosen backend.
Backend guidance: DuckDB is recommended for most users except the largest linkages, while Spark is recommended for very large linkages or where a Spark cluster is easier to access.
Data requirements: Splink works best with standardized data containing multiple columns that are not highly correlated, and is not designed for a single bag-of-words column.
Diagnostics: Interactive visualisations help users understand and diagnose linkage models, including dashboards for examining predictions and clusters.
Install: Splink can be installed using pip or conda, with optional backend-specific installs documented for Spark and PostgreSQL.
Support: The maker directs users with questions remaining after reading the documentation to its GitHub discussion forum.
Databricks support: The development team says it lacks access to a Databricks environment and may struggle to help with Databricks-specific issues.
Use cases: The maker lists users across government, academia, and other sectors, including the Office for National Statistics, NHS England, and the Australian Bureau of Statistics.
Price from: Free

Where it ranks on The Geeks Club

Best Identity Resolution Software in 2026#5 of 25

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Sources

moj-analytical-services.github.io/splink/· checked 29 Sept 2026
moj-analytical-services.github.io/splink/topic_guides/splink_fundamentals· checked 29 Sept 2026
moj-analytical-services.github.io/splink/api_docs/visualisations.html· checked 29 Sept 2026
moj-analytical-services.github.io/splink/getting_started.html· checked 29 Sept 2026
github.com/moj-analytical-services/splink· checked 29 Sept 2026