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Comparison · DevOps
Apache OpenNLP vs Stirling-PDF
A side-by-side editorial comparison of Apache OpenNLP and Stirling-PDF — release velocity, themes, recent moves, and the top alternatives to consider.
Apache OpenNLP vs Stirling-PDF: at a glance
What is Apache OpenNLP?
Apache OpenNLP ships 3.0.0 final, closing a milestone track that ran since spring.
Apache OpenNLP runs three release lines: 1.9.x for Lucene and Solr 8 users, 2.5.x as the stable line, and the 3.0 track that went through six milestones. On 12 November the project tagged 3.0.0 final alongside a 2.5.13 patch, again shipping both lines on the same day. The tags carry no release notes in the feed, so what changed since 3.0.0-M6 is not visible here.
What is Stirling-PDF?
Stirling PDF plans to drop LibreOffice for its own converter within two weeks
Stirling PDF 3.0 in late September added the PDF Processor for bulk jobs, optional AI and free OAuth SSO. Releases since have come about every two weeks: group signing by default in 3.1.0, a Page Editor in 3.2.0, viewer and annotation work in 3.2.x. 3.3.0 lets users pick the beta Stirling Office Convert in many more tools and adds Windows ARM64, lighter mobile scanning and caching.
Apache OpenNLP vs Stirling-PDF: editorial side-by-side
Apache OpenNLP
5.0DEVOPS
Apache OpenNLP ships 3.0.0 final, closing a milestone track that ran since spring.
◆ Current state
Apache OpenNLP runs three release lines: 1.9.x for Lucene and Solr 8 users, 2.5.x as the stable line, and the 3.0 track that went through six milestones. On 12 November the project tagged 3.0.0 final alongside a 2.5.13 patch, again shipping both lines on the same day. The tags carry no release notes in the feed, so what changed since 3.0.0-M6 is not visible here.
◆ Where it's heading
The 3.0 milestones combined security hardening (deserialization and XXE fixes, model-loading allowlists) with new text tooling such as the Unicode normalization engine and a SymSpell spell checker, while 2.5.x added RoBERTa inference through ONNX Runtime. With 3.0.0 out, the 2.5 line is likely to move to backports only, and new work should land on 3.x.
◆ Prediction
Expect a 3.0.1 patch and continued 2.5.x security backports; whether 1.9.x gets further releases is unclear from these entries.
Stirling-PDF
5.0DEVOPS
Stirling PDF plans to drop LibreOffice for its own converter within two weeks
◆ Current state
Stirling PDF 3.0 in late September added the PDF Processor for bulk jobs, optional AI and free OAuth SSO. Releases since have come about every two weeks: group signing by default in 3.1.0, a Page Editor in 3.2.0, viewer and annotation work in 3.2.x. 3.3.0 lets users pick the beta Stirling Office Convert in many more tools and adds Windows ARM64, lighter mobile scanning and caching.
◆ Where it's heading
The project is replacing third-party dependencies with its own components. 3.3.0 says Office Convert should become the default next week and LibreOffice should be removed the week after, which would shrink the install and change conversion results for every user.
◆ Prediction
Expect Office Convert to become the default converter in the next release, then LibreOffice removed, as 3.3.0's notes lay out. Conversion bug reports will decide whether that schedule holds.
Alternatives to Apache OpenNLP and Stirling-PDF
Other DevOps products tracked by Sparkpulse, ranked by recent ship velocity. Each card links to a full editorial trajectory and lets you pivot into a head-to-head comparison with either Apache OpenNLP or Stirling-PDF.
Appsmith
Appsmith 2.7 makes its MCP agent ask before deleting widgets and blocks stale edits.
Apache Arrow Rust
Arrow Rust cuts release candidates on three older lines at once.
Sanity
Sanity's MCP server now explains failed validations and stops skipping them.
GitHub
GitHub sets a December 8 cutoff for ARM32 Actions runners and opens AI Scan to the API.
Manticore Search
Manticore keeps patching 31.x, now fixing a FREEZE crash and a DocID ordering bug.
See all Apache OpenNLP alternatives → · See all Stirling-PDF alternatives →
Recent activity from Apache OpenNLP and Stirling-PDF
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 2d agoApache OpenNLPApache OpenNLP 2.5.13 maintenance release
- 2d agoApache OpenNLPApache OpenNLP 3.0.0 final release
- 9d agoStirling-PDF3.3.0 Conversion upgrades, bug fixes and several minor improvements
- 21d agoStirling-PDF3.2.2 new annotations and other minor changes and improvements
- 23d agoStirling-PDF3.2.1 Viewer improvements and bug fixes
- 29d agoStirling-PDF3.2.0 New Multi-tool, better passworded PDFs and lots of improvements
- 1mo agoStirling-PDF3.1.0 Stirling Sign, signature improvements, Stirling Office Convert (beta) and text editor upgrades
- 1mo agoStirling-PDF3.0.2 bug fixes and dependency updates
- 2mo agoApache OpenNLPApache OpenNLP 2.5.12 released
- 2mo agoApache OpenNLPApache OpenNLP 3.0.0-M6 milestone released
- 3mo agoApache OpenNLPOpenNLP 3.0.0-M5 ⚡
- 3mo agoApache OpenNLPOpenNLP 1.9.5
Frequently asked questions
What is the difference between Apache OpenNLP and Stirling-PDF?
They serve adjacent needs but don't currently overlap on shipped themes. Apache OpenNLP and Stirling-PDF are shipping at a similar cadence (velocity 5.0 vs 5.0, both within Sparkpulse's "active" band). See the at-a-glance table above for a side-by-side breakdown of velocity, recent sparks, and editorial themes.
Is Apache OpenNLP better than Stirling-PDF?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Apache OpenNLP and Stirling-PDF are shipping at a similar cadence (velocity 5.0 vs 5.0, both within Sparkpulse's "active" band). For your specific use case, the alternatives sections above list other DevOps products to evaluate alongside.
What are the best alternatives to Apache OpenNLP?
Top Apache OpenNLP alternatives in DevOps are ranked by recent ship velocity. Browse the "Apache OpenNLP alternatives" section above for the current picks, or visit /alternatives/apache-opennlp for the full list with editorial commentary on each.
What are the best alternatives to Stirling-PDF?
Top Stirling-PDF alternatives in DevOps are ranked by recent ship velocity. Browse the "Stirling-PDF alternatives" section above for the current picks, or visit /alternatives/stirling-pdf for the full list with editorial commentary on each.