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Comparison · DevOps
Groonga vs Stirling-PDF
A side-by-side editorial comparison of Groonga and Stirling-PDF — release velocity, themes, recent moves, and the top alternatives to consider.
Groonga vs Stirling-PDF: at a glance
What is Groonga?
Groonga is putting a full-text search engine into WebAssembly and the browser.
Groonga ships every one to three weeks, and the 16.1 line has a clear thread: experimental WASI support. 16.1.2 added a WASI groonga command and a browser build that downloads a database over HTTP on demand, 16.1.4 extended WASI to tokenizer and normalizer options, and 16.1.5 linked plugins statically so they work under WASI. Alongside that, 16.1.1 made logical_select run shards and drilldowns in parallel, measured at 1.5x faster with two workers.
What is Stirling-PDF?
Stirling PDF's 3.x line ships bulk processing, org-wide signing and fortnightly feature releases
Stirling PDF 3.0 in late September added the PDF Processor for running tools across folders, FTP or S3 sources, optional AI classification and extraction, free OAuth SSO and a free allowance of 1,000 automated PDFs a month. Releases since have arrived about every two weeks: 3.1.0 made group signing (Stirling Sign) default for new users and trialled an embedded Office converter, 3.2.0 replaced the multi-tool with a Page Editor and let password-protected PDFs be used without removing the password, and 3.2.1 and 3.2.2 added viewer and annotation features.
Groonga vs Stirling-PDF: editorial side-by-side
Groonga
5.0DEVOPS
Groonga is putting a full-text search engine into WebAssembly and the browser.
◆ Current state
Groonga ships every one to three weeks, and the 16.1 line has a clear thread: experimental WASI support. 16.1.2 added a WASI groonga command and a browser build that downloads a database over HTTP on demand, 16.1.4 extended WASI to tokenizer and normalizer options, and 16.1.5 linked plugins statically so they work under WASI. Alongside that, 16.1.1 made logical_select run shards and drilldowns in parallel, measured at 1.5x faster with two workers.
◆ Where it's heading
The WebAssembly work is moving piece by piece from the core command to options and plugins, which points toward a usable in-browser search engine. Every WASI item is still marked experimental and not stable.
◆ Prediction
Expect more WASI coverage in the next 16.1.x releases, with the experimental label likely to stay for now.
Stirling-PDF
5.0DEVOPS
Stirling PDF's 3.x line ships bulk processing, org-wide signing and fortnightly feature releases
◆ Current state
Stirling PDF 3.0 in late September added the PDF Processor for running tools across folders, FTP or S3 sources, optional AI classification and extraction, free OAuth SSO and a free allowance of 1,000 automated PDFs a month. Releases since have arrived about every two weeks: 3.1.0 made group signing (Stirling Sign) default for new users and trialled an embedded Office converter, 3.2.0 replaced the multi-tool with a Page Editor and let password-protected PDFs be used without removing the password, and 3.2.1 and 3.2.2 added viewer and annotation features.
◆ Where it's heading
The product is moving from a self-hosted toolbox to an automation and workflow platform with metered hosted services attached. Feature releases come quickly, with visible regressions fixed in the next point release.
◆ Prediction
Expect Stirling Office Convert to move toward default and native desktop, as the 3.1.0 notes say is planned, plus continued Processor work.
Alternatives to Groonga 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 Groonga or Stirling-PDF.
Bitwarden
Bitwarden's server releases are filling in Privileged Controls, one PAM building block a month.
Liquidsoap
Liquidsoap 2.5.0 reaches its first release candidate while 2.4 keeps getting patches.
Skaffold
Skaffold 2.25 finally carries notes, and they are dependency bumps and a Go 1.27 upgrade.
GitHub
At Universe, GitHub folds Copilot into Enterprise seats and lets Copilot Fusion pick the model.
direnv
direnv returned after 15 months with uv and pixi layouts and a kill switch.
See all Groonga alternatives → · See all Stirling-PDF alternatives →
Recent activity from Groonga and Stirling-PDF
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 4d agoGroongaGroonga 16.1.5 - 2026-10-29
- 9d agoStirling-PDF3.2.2 new annotations and other minor changes and improvements
- 11d agoStirling-PDF3.2.1 Viewer improvements and bug fixes
- 17d agoGroongaGroonga 16.1.4 - 2026-10-16
- 17d agoStirling-PDF3.2.0 New Multi-tool, better passworded PDFs and lots of improvements
- 25d agoGroongaGroonga 16.1.3 - 2026-10-08
- 27d 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
- 1mo agoGroongaGroonga 16.1.2 runs experimentally in WASI and the browser
- 1mo agoStirling-PDF3.0.1 hotfix for windows desktop bugs
- 1mo agoGroongaGroonga 16.1.1 parallelises logical_select across shards
- 2mo agoGroongaCrash fix when index segment allocation fails
Frequently asked questions
What is the difference between Groonga and Stirling-PDF?
They serve adjacent needs but don't currently overlap on shipped themes. Groonga 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 Groonga better than Stirling-PDF?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Groonga 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 Groonga?
Top Groonga alternatives in DevOps are ranked by recent ship velocity. Browse the "Groonga alternatives" section above for the current picks, or visit /alternatives/groonga 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.