Soda, Deequ, Elementary, Great Expectations (GX Core) have free plans. The highest-ranked is Soda (8.7/10): Free plan with free Soda Processing Units (SPUs), unlimited users, pipeline testing, metrics observability and alerting; no credit card. Soda Core library is also free to use (Elastic License 2.0).
Data quality tools measure and improve how accurate, complete and consistent your data is. They profile data to show what it looks like, run rules that flag bad records, and in some cases correct or standardise values. Options range from open-source libraries that data engineers run in code to enterprise platforms with business-user interfaces and data cleansing.
| Tool | Score | Free plan | Paid from (annual) | Data profiling | Custom rule checks | ML anomaly detection | Data cleansing / correction | Open source |
|---|---|---|---|---|---|---|---|---|
| Soda | 8.7/10 | Yes | See vendor | Yes | Yes | Yes | Not confirmed | No |
| Deequ | 8.4/10 | Yes | See vendor | Yes | Yes | Not confirmed | Not confirmed | Yes |
| Elementary | 8.4/10 | Yes | See vendor | Not confirmed | Yes | Yes | Not confirmed | Yes |
| Great Expectations (GX Core) | 7.9/10 | Yes | See vendor | Not confirmed | Yes | Not confirmed | Not confirmed | Yes |
| Tool | What the free plan includes | First paid plan |
|---|---|---|
| Soda | Free plan with free Soda Processing Units (SPUs), unlimited users, pipeline testing, metrics observability and alerting; no credit card. Soda Core library is also free to use (Elastic License 2.0). | See vendor |
| Deequ | Open-source library (Apache-2.0) | See vendor |
| Elementary | Elementary OSS: open-source dbt package and CLI, self-hosted | See vendor |
| Great Expectations (GX Core) | GX Core open-source library (Apache-2.0), self-hosted | See vendor |
Data quality platform built around data contracts, with metric monitoring and a Python engine (Soda Core).
Open-source library from AWS Labs for defining unit tests for data on Apache Spark.
dbt-native data observability with an open-source package and CLI plus a paid cloud platform.
Open-source Python library for testing data with declarative 'Expectations'.
Yes. Free plan with free Soda Processing Units (SPUs), unlimited users, pipeline testing, metrics observability and alerting; no credit card. Soda Core library is also free to use (Elastic License 2.0). Paid plans start at see vendor.
Yes. Open-source library (Apache-2.0) Paid plans start at see vendor.
Yes. Elementary OSS: open-source dbt package and CLI, self-hosted Paid plans start at see vendor.
Yes. GX Core open-source library (Apache-2.0), self-hosted Paid plans start at see vendor.
Scores come from published, repeatable data (features, free plan, entry price, pricing transparency). No vendor can pay to change a score. Read the methodology · Disclosure.