Lookeen vs Open Semantic Desktop Search

Lookeen8.1Visit OSOpen Semantic Desktop Search7.7Visit

Higher score Lookeen #8 in Desktop Search Software 8.1/10 14-day trial Free trial✓ 3 of 4 features Visit Lookeen

vs

OS Open Semantic Desktop Search #12 in Desktop Search Software 7.7/10 Free plan Free plan✓ 3 of 4 features Visit Open Semantic

• Lookeen fits best

  Business Outlook and Exchange search

• Open Semantic Desktop Search fits best

  Free search across mixed document stores

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Side by side

Feature	Lookeen 8.1/10 Visit ↗	OSOpen Semantic Desktop Search 7.7/10 Visit ↗
At a glance
Editor score	8.1	7.7
Ranking	#8 in Desktop Search Software	#12 in Desktop Search Software
Best for	Business Outlook and Exchange search	Free search across mixed document stores
Pricing model	Paid	Free
Starting price	€9/user/mo	Free plan
Free plan	—	✓ (best)
Free trial	14 days	—
Deployment	Cloud, Self-hosted, Desktop	Desktop, Self-hosted
Platforms	Web, Windows	Web, Windows, macOS, Linux
Support	Email, Phone, Docs · 24/7	Docs
Built for	Solo, Small business, Mid-market, Enterprise	Solo, Small business, Mid-market, Enterprise
Features Lookeen 3/4 · Open Semantic Desktop Search 3/4
Content search	✓	✓
Email search	✓	✓
Message search	Not checked yet	Not checked yet
OCR search	✓	✓
Specs
Supported platforms	web, windows	web, windows, macos, linux
Index locations	local, removable, network	local folders, file servers, file shares
Indexed-item limit	Not checked yet	Not checked yet
Our review
Pros	Indexes local, external, and network drives Searches Outlook, Exchange, attachments, and public folders Adds OCR, filters, previews, saved queries, and AI summaries	Full-text, faceted, OCR, and exploratory search Indexes documents, media files, and Outlook PST mailboxes Previews, tagging, annotation, and filesystem monitoring
Cons	No permanent free plan; the trial lasts 14 days Desktop support is focused on Windows, with web access Server pricing is custom-priced rather than a fixed per-user tier	Distributed as a VirtualBox virtual machine Setup may require configuring folders and indexed sources Verified integration breadth is limited
Our verdict	Lookeen is desktop and enterprise search software for Windows users and organizations that need one search layer across files, email, Outlook data, Exchange folders, and network locations. It indexes local, external, removable, and network… Read the review →	Open Semantic Desktop Search is a free, open-source search engine for individual desktop users, researchers, and organizations managing heterogeneous document collections. It indexes content from local folders, file servers, and file… Read the review →

Strengths and trade-offs

• Lookeen — where it wins

  • Indexes local, external, and network drives
  • Searches Outlook, Exchange, attachments, and public folders
  • Adds OCR, filters, previews, saved queries, and AI summaries

  Where it doesn't

  • No permanent free plan; the trial lasts 14 days
  • Desktop support is focused on Windows, with web access
  • Server pricing is custom-priced rather than a fixed per-user tier

• Open Semantic Desktop Search — where it wins

  • Full-text, faceted, OCR, and exploratory search
  • Indexes documents, media files, and Outlook PST mailboxes
  • Previews, tagging, annotation, and filesystem monitoring

  Where it doesn't

  • Distributed as a VirtualBox virtual machine
  • Setup may require configuring folders and indexed sources
  • Verified integration breadth is limited

• Lookeen8.1/10 · 14-day trial

  A Windows-focused search layer for Outlook, Exchange, files, and network data.

  Visit LookeenFull verdict →
• OSOpen Semantic Desktop Search7.7/10 · Free plan

  A capable free search layer for mixed local, shared, and email archives.

  Visit Open SemanticFull verdict →