ast-grep Free plan 9.1 Visit jSparrow
jsparrow.io
What it is
jSparrow is a Java cleanup and refactoring tool for Eclipse IDE and Maven, running on Linux, macOS and Windows. It lists more than 90 refactorings for Java 1.1 and later, with project-level and batch operation. Diff View compares original and proposed code so changes can be reviewed before application. Markers suggest quick fixes during programming, and the base product includes them at no charge. Interactive rules can replace standard output with logging, rename fields to Java naming conventions and remove unused methods, fields and types. Analysis and refactoring run offline, and the FAQ says code is not sent to external servers or third parties. Internet access is required to persist locked refactorings through the NetLicensing API; offline validation servers are available. The site describes jSparrow as open-source, with no license needed since version 4.20.0. Twenty rules are free; paid licenses are $169 a month or $1,325 a year.
Spec sheet
- Purpose
- jSparrow helps Java developers clean up and refactor code in Eclipse IDE and Maven.Read 8 Oct 2026 · jsparrow.io
- Support
- The contact page asks users to allow 1–3 business days for a response.Read 8 Oct 2026 · jsparrow.io
- Company
- jSparrow is developed by Splendit IT-Consulting, which says it has operated in Austria since 2004.Read 7 Oct 2026 · jsparrow.io
- Maker
- jSparrow was developed by Splendit IT-Consulting, which the homepage describes as an Austrian IT-consulting company established in 2004.Read 8 Oct 2026 · jsparrow.io
- AI
- The pricing page says jSparrow does not use AI and that its developers implement and test its rules in-house.Read 8 Oct 2026 · jsparrow.io
- Code privacy
- The FAQ says analysis and refactoring happen offline and the plugin does not send code to an external server or third party.Read 8 Oct 2026 · jsparrow.io
- Diff view
- Users can compare original and refactored code in jSparrow’s Diff View and review changes before applying them.Read 7 Oct 2026 · jsparrow.io
- Eclipse support
- The installation page lists Eclipse versions 4.12 through 4.37 as including jSparrow.Read 8 Oct 2026 · jsparrow.io
- Free rules
- The site says 20 refactoring rules are available for free.Read 8 Oct 2026 · jsparrow.io
- GitHub availability
- The FAQ says Maven and GitHub versions are available only by contacting jSparrow.Read 8 Oct 2026 · jsparrow.io
- Interactive rules
- Interactive rules can replace standard output statements with logging, rename fields to Java naming conventions, and remove unused methods, fields, and types.Read 7 Oct 2026 · jsparrow.io
- License validation
- Internet is needed to save or persist locked refactorings, for which jSparrow uses the NetLicensing public API; the company also offers offline validation servers.Read 7 Oct 2026 · jsparrow.io
- Logging integrations
- The System out to logging rule requires a configured logging environment such as log4j or slf4j.Read 7 Oct 2026 · jsparrow.io
- Maven and GitHub
- The FAQ says jSparrow for Maven and GitHub is available by contacting the company.Read 7 Oct 2026 · jsparrow.io
- Maven integration
- The jSparrow Maven plugin applies automatic refactorings from the command line without an IDE, and Maven licenses are offered on request.Read 8 Oct 2026 · jsparrow.io
- Offline license validation
- The pricing page says jSparrow can provide offline validation servers for companies with security concerns.Read 8 Oct 2026 · jsparrow.io
- Offline processing
- The FAQ says analysis and refactoring happen offline and code is not transferred to an external server or third party.Read 7 Oct 2026 · jsparrow.io
- Offline use
- The FAQ says refactorings can be computed offline, while internet is needed to validate a license key for saving locked refactorings.Read 8 Oct 2026 · jsparrow.io
- Open source
- The site says jSparrow is open-source and no license is needed since version 4.20.0.Read 7 Oct 2026 · jsparrow.io
- Quick fixes
- jSparrow Markers suggest quick fixes during programming and are included in the base product for free.Read 7 Oct 2026 · jsparrow.io
- Refactorings
- The Java refactoring page lists 118 granular rules and 94 quick fixes.Read 8 Oct 2026 · jsparrow.io
Plans and prices
1-Month License $169 a month 1 Month Node-locked Read 8 Oct 2026 · jsparrow.io
1-Year License $1,325 a year 1 Year Node-locked Read 8 Oct 2026 · jsparrow.io
Strong points and limits
Strong points
- More than 90 Java refactorings
- Offline analysis keeps code local
- Diff View enables change review
- Free base product and 20 free rules
- Linux, macOS and Windows support
Limits
- Locked refactorings need internet validation
- Maven and GitHub versions require contact
- Logging rule needs log4j or slf4j
- Paid licenses are node-locked
Who it suits
It suits Java developers using Eclipse who want project-level cleanup and refactoring. Maven or GitHub users must contact jSparrow for those versions.
Verdict
jSparrow combines a broad Java rule set with offline processing and reviewable diffs. Check the licensing and contact requirements if you need locked rules, Maven or GitHub integration.
Where Specifiction places it
- Code Refactoring Tools#5 of 228.2
