Glean is usually the best pick for company-wide document search when employees need fast answers across Google Drive, Slack, Confluence, Jira, Salesforce, and similar tools. Microsoft 365 Copilot is the safer fit for firms already living inside Word, Teams, Outlook, SharePoint, and OneDrive. Elastic Search AI is best when a company has engineers who want control over search relevance, permissions, custom apps, and private data pipelines. Microsoft 365 Copilot costs $30 per user per month with annual billing, which gives buyers a clear pricing anchor for comparison [source: Microsoft].
TLDR: Glean wins for broad workplace search, Microsoft 365 Copilot wins for Microsoft-heavy teams, and Elastic Search AI wins for custom search projects. For example, a 1,000-person company losing just 6 minutes per employee per day to document hunting gives up about 100 work hours daily. If even 30% of that time is recovered, the impact is real. The right choice depends less on “best AI” and more on where company knowledge actually sits.
What These Tools Actually Do
Glean is an AI workplace search tool. It connects to many business apps and gives employees one place to ask questions, find documents, and see trusted answers. It is built for messy company knowledge. That means old project docs, Slack threads, tickets, calendar context, and CRM notes.
Elastic Search AI is more of a builder’s platform. Elastic can power semantic search, vector search, log search, and AI retrieval. It suits teams that need a custom internal search layer, not just a packaged assistant. The tradeoff is effort. Expect setup work, tuning, indexing rules, and engineering time.
Microsoft 365 Copilot brings AI into the Microsoft stack. It summarizes meetings, drafts emails, searches SharePoint, reads Teams chats, and helps with Office files. It can feel very smooth when content lives in Microsoft 365. It can feel boxed in when key knowledge sits outside that world.
Best For Each Type of Company
- Glean: Best for mid-size and large firms with knowledge spread across many SaaS tools.
- Elastic Search AI: Best for technical teams that need custom search, strict control, or product search features.
- Microsoft 365 Copilot: Best for firms already standardized on Teams, Outlook, SharePoint, and OneDrive.
Honestly, it feels like many companies buy AI search before admitting how broken their document habits are. Duplicate files, weak titles, private folders, stale decks, and unclear ownership still matter. AI can reduce the pain, but it cannot fully rescue a sloppy knowledge base.
Glean: Strengths and Weak Spots
Glean’s biggest strength is its broad connector model. It can pull results from many common workplace systems and rank them by context. That context matters. An engineer, sales rep, and HR manager may search the same phrase and need different answers.
Glean also handles permissions well. Employees should only see what they are allowed to see in the original source system. That is a basic need, but it is not trivial at scale.
The weak spot is cost and rollout discipline. Glean works best when many systems are connected and employees trust the results. If rollout is half-done, value drops. It may also be more tool than a small company needs.
Elastic Search AI: Strengths and Weak Spots
Elastic is powerful because it is flexible. Teams can create custom search flows, tune relevance, add embeddings, and connect search to AI chat interfaces. It is not limited to office documents. It can also search logs, support tickets, product catalogs, code, and operational data.
That control is useful for large firms with unusual systems. Banks, healthcare groups, marketplaces, and software companies often need this level of control.
The catch is that Elastic is not a simple plug-and-play workplace answer. Someone has to design the indexes. Someone has to manage access rules. Someone has to tune results when employees complain that the “right” document is buried five results down. That can get old fast.
Microsoft 365 Copilot: Strengths and Weak Spots
Microsoft 365 Copilot is strong because it sits where many employees already work. A user can ask for a meeting recap in Teams, draft a proposal in Word, or summarize long email threads in Outlook. That saves time without forcing a new search habit.
Its document search is strongest when SharePoint and OneDrive are clean. Good permissions, clear file names, and sensible folders help a lot. If a company has years of dumped files and random access rights, Copilot may surface answers that feel thin or incomplete.
The main weakness is scope. Many firms do not keep all knowledge in Microsoft. Slack, Notion, GitHub, Zendesk, Jira, ServiceNow, and Salesforce may hold the real answer. In that case, Copilot is helpful, but not enough by itself.
Side-by-Side Comparison
- Ease of use: Microsoft 365 Copilot is easiest for Microsoft users. Glean is simple once connected. Elastic needs more technical work.
- Coverage: Glean usually covers more workplace apps out of the box. Copilot favors Microsoft content. Elastic can cover almost anything, if built well.
- Customization: Elastic wins. Glean offers business-ready configuration. Copilot is less flexible.
- Speed to value: Copilot can be quick for Microsoft firms. Glean can be quick if connectors are ready. Elastic takes longer.
- Best user: Glean serves every employee. Copilot serves Microsoft users. Elastic serves technical and product teams.
Which One Should a Company Choose?
A company should choose Glean if employees constantly ask, “Where is that doc?” across several apps. It is the strongest general internal search option.
A company should choose Microsoft 365 Copilot if most useful work happens inside Microsoft 365. It is especially helpful for email, meetings, documents, and daily office tasks.
A company should choose Elastic Search AI if it needs a custom search engine or wants AI answers inside its own apps. It is less friendly at first, but far more controllable.
For many large firms, the final setup may not be one tool. Copilot may support office work. Glean may serve as the company-wide knowledge assistant. Elastic may power technical search behind internal portals or customer-facing products.
FAQ
- Which tool is best for internal document search?
Glean is usually best for broad internal document search across many business apps. - Is Microsoft 365 Copilot enough for company search?
It can be enough if most documents, chats, and files live in Microsoft 365. If not, gaps may appear. - Is Elastic Search AI hard to use?
It is harder than Glean or Copilot. It usually needs engineers, search tuning, and careful setup. - Which option is best for a small company?
Microsoft 365 Copilot may be the simplest if the company already pays for Microsoft 365. Glean may be better once tool sprawl grows. - Can these tools respect file permissions?
Yes, but setup matters. Poor permissions in source systems can still create messy or risky results.