Smile
Statistical Machine Intelligence & Learning Engine for scalable machine learning.
- Status
- Generally available
- Last checked
- Checked · Oct 12, 2026
- License
- Open source
- Pricing
- Free tier · from $0
What it is
Smile is a fast and comprehensive machine learning library in Java and Scala. It provides a wide range of algorithms for classification, regression, clustering, association rule mining, feature selection, manifold learning, multidimensional scaling, genetic algorithm, missing value imputation, complex optimization, and more.
Smile stands out as a robust and comprehensive open-source library specifically optimized for performance in Java/Scala environments, offering a wide array of machine learning algorithms without the need for external dependencies.
When it fits — and when it doesn’t
A good fit for
Java developers who need a comprehensive library to integrate machine learning capabilities into their applications.
Projects requiring high-performance, scalable machine learning solutions in Java/Scala environments.
Look elsewhere if
Developers looking for cloud-based managed services for machine learning.
Teams preferring Python or other languages over Java and Scala.
Known weaknesses
Each one links to the public issue, changelog or docs page it came from, where we have one.
- 01
Limited language support
Smile is primarily developed for Java and Scala, which may not cater to developers proficient in other languages like Python or R.
- 02
Complex setup process
Setting up Smile requires a good understanding of the JVM ecosystem and managing dependencies with tools like Maven or SBT can be challenging for beginners.
- 03
Performance issues on large datasets
While optimized, Smile may experience performance bottlenecks when dealing with extremely large datasets due to memory constraints in JVM environments.
What it does well
Supports a wide range of machine learning algorithms.
Optimized for performance and scalability.
Comprehensive documentation and examples.
Pricing
- Free tier
- YesOpen source — free to use
- Paid from
- $0
- Model
- Flat rate
- Enterprise plan
- No
Pricing not independently confirmed — check the vendor’s page.
Performance benchmarks
How Fast Is It?
Set up Smile
Setup steps, common gotchas and what to check after 30 days.
Get the badge
A small badge for Smile’s README or site: its name, “Tracked on AI Navigator”, and the availability status and check month from this page. It updates as the catalog does.
Markdown
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