# Nitro Pro vs Stirling-PDF

**Leader by Vioscale score:** Nitro Pro

| Attribute | Nitro Pro | Stirling-PDF |
|---|---|---|
| **Vioscale score** | 63.3 (55% (medium)) | 57 (16% (low)) |
| activity.commits_last_30d | - | 100 |
| adoption.dependent_repos | - | 0 |
| adoption.github_stars | - | 90,481 |
| deployment.options | `{"cloud":true}` | `{"hybrid":true,"on_prem":true,"self_hosted":true}` |
| description.long | Comprehensive software for creating, editing, and securing PDFs with integrated digital signature capabilities and intelligent document automation. Available across Windows, Mac, iOS, and web with enterprise-grade security and productivity features. | A versatile PDF platform offering editing, signing, redaction, and conversion capabilities. Can run as a standalone desktop application, in a web browser, or deployed on private servers, with REST APIs for integration and workflow automation. |
| features.capabilities | `{"iso_27001":true,"soc2_type_ii":true,"pricing_model":"flat_subscription","deployment_model":"cloud_saas","file_size_compression_engine":true,"interactive_form_field_creation":true,"password_protection_and_encryption":true,"permanent_blackout_redaction_engine":true,"microsoft_office_docx_xlsx_conversion":true,"page_merging_extraction_and_splitting":true,"base_text_and_image_editing_within_pdf":true,"ocr_optical_character_recognition_scanning":true,"digital_signature_certification_enforcement":true}` | - |
| integrations.count | 20 | - |
| integrations.list | `[{"name":"Salesforce"},{"name":"Microsoft 365"},{"name":"Word"},{"name":"Excel"},{"name":"PowerPoint"},{"name":"SharePoint"},{"name":"OneDrive"},{"name":"Teams"},{"name":"Slack"},{"name":"Google Workspace"},{"name":"Zapier"},{"name":"iManage"},{"name":"M-Files"},{"name":"PDF Butler"},{"name":"Alfresco"},{"name":"TalentSoft"},{"name":"Aareon"},{"name":"Silverfin"},{"name":"AdminPulse"},{"name":"Sofico"}]` | - |
| language.primary | - | Java |
| market.availability | `{"hqCountry":"IE","primaryMarkets":["US","GB","CA","AU"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | - |
| platform.support | `{"ios":true,"mac":true,"web":true,"windows":true}` | `{"cli":true,"mac":true,"web":true,"linux":true,"windows":true}` |
| pricing | `{"type":"subscription","plans":[{"free":false,"name":"Individual/Teams","features":["Edit text and images","OCR","Digital signatures","Form creation","File compression","AI summarization and data extraction"],"description":"Full-featured PDF editor with AI tools and integrations","contactSales":false},{"free":false,"name":"Plus","features":["All standard features","Nitro Analytics dashboard","ROI tracking","Sustainability metrics"],"description":"Includes analytics and usage insights","contactSales":false},{"free":false,"name":"Enterprise","features":["API access","SSO","Azure Information Protection","Domain control","QTSP qualified electronic signatures","Custom configurations"],"description":"Advanced compliance and custom integrations for large organizations","contactSales":true}],"summary":"Subscription-based with tiered plans; enterprise pricing by quote","currency":"USD","freeTier":true,"sourceUrl":"https://www.gonitro.com/pricing?hsLang=en","retrievedAt":"2026-08-25T15:42:36.809Z","freeTrialDays":14,"billingPeriods":["month","year"]}` | `{"type":"open_source","freeTier":true,"sourceUrl":"https://stirlingpdf.com/pricing","retrievedAt":"2026-08-20T14:05:21.556Z"}` |
| pricing.free_tier | yes | yes |
| pricing.model | freemium | open_source |
| pricing.price_level | low | free |
| pricing.transparent | no | - |
| release.cadence_days | - | 6 |
| release.history | - | `[{"url":"https://github.com/Stirling-Tools/Stirling-PDF/releases/tag/v2.14.3","date":"2026-08-06T18:48:12Z","type":"stable","version":"v2.14.3"},{"url":"https://github.com/Stirling-Tools/Stirling-PDF/releases/tag/v2.14.2","date":"2026-07-08T09:59:54Z","type":"stable","version":"v2.14.2"},{"url":"https://github.com/Stirling-Tools/Stirling-PDF/releases/tag/v2.14.1","date":"2026-07-07T21:56:29Z","type":"stable","version":"v2.14.1"},{"url":"https://github.com/Stirling-Tools/Stirling-PDF/releases/tag/v2.14.0","date":"2026-06-30T22:48:14Z","type":"stable","version":"v2.14.0"},{"url":"https://github.com/Stirling-Tools/Stirling-PDF/releases/tag/v2.13.2","date":"2026-06-24T21:06:14Z","type":"stable","version":"v2.13.2"},{"url":"https://github.com/Stirling-Tools/Stirling-PDF/releases/tag/v2.13.1","date":"2026-06-19T18:27:49Z","type":"stable","version":"v2.13.1"},{"url":"https://github.com/Stirling-Tools/Stirling-PDF/releases/tag/v2.13.0","date":"2026-06-18T21:29:00Z","type":"stable","version":"v2.13.0"},{"url":"https://github.com/Stirling-Tools/Stirling-PDF/releases/tag/v2.12.0","date":"2026-06-09T20:40:03Z","type":"stable","version":"v2.12.0"},{"url":"https://github.com/Stirling-Tools/Stirling-PDF/releases/tag/v2.11.0","date":"2026-05-19T10:52:27Z","type":"stable","version":"v2.11.0"},{"url":"https://github.com/Stirling-Tools/Stirling-PDF/releases/tag/v2.10.1","date":"2026-05-07T20:07:16Z","type":"stable","version":"v2.10.1"},{"url":"https://github.com/Stirling-Tools/Stirling-PDF/releases/tag/v2.10.0","date":"2026-04-24T13:12:51Z","type":"stable","version":"v2.10.0"},{"url":"https://github.com/Stirling-Tools/Stirling-PDF/releases/tag/v2.9.2","date":"2026-04-04T09:32:15Z","type":"stable","version":"v2.9.2"},{"url":"https://github.com/Stirling-Tools/Stirling-PDF/releases/tag/v2.9.1","date":"2026-04-03T16:48:50Z","type":"stable","version":"v2.9.1"},{"url":"https://github.com/Stirling-Tools/Stirling-PDF/releases/tag/v2.9.0","date":"2026-04-02T18:02:36Z","type":"stable","version":"v2.9.0"},{"url":"https://github.com/Stirling-Tools/Stirling-PDF/releases/tag/v2.8.0","date":"2026-03-24T18:58:13Z","type":"stable","version":"v2.8.0"},{"url":"https://github.com/Stirling-Tools/Stirling-PDF/releases/tag/v2.7.3","date":"2026-03-19T15:35:02Z","type":"stable","version":"v2.7.3"},{"url":"https://github.com/Stirling-Tools/Stirling-PDF/releases/tag/v2.7.2","date":"2026-03-13T10:38:08Z","type":"stable","version":"v2.7.2"},{"url":"https://github.com/Stirling-Tools/Stirling-PDF/releases/tag/v2.7.1","date":"2026-03-12T21:58:46Z","type":"stable","version":"v2.7.1"},{"url":"https://github.com/Stirling-Tools/Stirling-PDF/releases/tag/v2.7.0","date":"2026-03-06T11:21:47Z","type":"stable","version":"v2.7.0"},{"url":"https://github.com/Stirling-Tools/Stirling-PDF/releases/tag/v2.6.0","date":"2026-03-03T20:46:42Z","type":"stable","version":"v2.6.0"}]` |
| security.disclosure_policy | yes | - |
| security.gdpr | yes | - |
| security.hipaa | yes | - |
| security.iso27001 | yes | - |
| security.soc2 | yes | - |
| security.vulnerabilities | - | `{"count":0,"source":"https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=go&package_name=github.com%2Fstirling-tools%2Fstirling-pdf&per_page=100","last_12m":0,"max_severity":null}` |

## Capabilities (PDF Editors)

| Capability | Nitro Pro | Stirling-PDF |
|---|:--:|:--:|
| **Capabilities** |  |  |
| Deployment model | Cloud saas | - |
| Base text and image editing within PDF | ✓ | - |
| Page merging extraction and splitting | ✓ | - |
| OCR optical character recognition scanning | ✓ | - |
| Permanent blackout redaction engine | ✓ | - |
| Password protection and encryption | ✓ | - |
| Interactive form field creation | ✓ | - |
| Digital signature certification enforcement | ✓ | - |
| Microsoft office docx xlsx conversion | ✓ | - |
| File size compression engine | ✓ | - |
| SOC2 type ii | ✓ | - |
| ISO 27001 | ✓ | - |
| Pricing model | Flat subscription | - |

*Source: Vioscale. Generated 2026-09-01T16:27:34.290Z. "-" = undocumented, not absent.*