fastwrite vs Opsis
A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.
fastwrite compared with Opsis
| Detail | 
fastwrite | 
Opsis |
|---|
| What it does | AI writing assistant for academic papers integrated into Microsoft Word
| Autocomplete and AI assistant for Mac and Windows, built on a private account of your work
|
|---|
| Stage | Not given
| Startup
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| Founded | Not given
| 2026
|
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| Based in | DE
| AU
|
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| Pricing model | Freemium
| Freemium
|
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| Pricing | Not given
| Not given
|
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| Key features | - Search over 20 million scientific papers using natural language queries
- Upload and chat with PDFs up to 1,000 pages per document
- AI-powered sentence and paragraph completion in Word with source citations
- Deep Review evaluation against nine university grading criteria
- Automatic APA 7 citation formatting
- Cross-document PDF search within entire project library
- Connector integration with Claude and ChatGPT
- Own-sources-only mode restricting generation to personal documents
- Available on macOS, Windows, and Web App
| - Autocomplete with Tab to accept drafts
- Error detection and fact-checking
- Cross-app integration
- Source attribution for every suggestion
- Context-aware AI assistance
- One-click pause and privacy control
- Encrypted data storage
- Read-only app connections
- Natural writing style matching
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| What makes it different | - Integrated directly into Microsoft Word workflow without switching applications
- Prevents plagiarism by automatically inserting citations and suggesting paraphrasing
- Specifically optimized for academic writing using custom language models
- Evaluates work against actual university grading criteria with specific improvement suggestions
- All work remains private and never used for model training
| - Finishes sentences from your actual work history and connected files, not generic AI
- Shows source for every suggestion so you can verify it before accepting
- Catches mistakes and contradictions between what you're writing and your work history
- Works inline in the apps you already use without installation
- You stay the author with full control over what gets written
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 15 ▲ +1 (up) since last check | 4 ● no change since last check |
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| Trust Flow (Majestic) | 17 | 0 |
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| Citation Flow (Majestic) | 27 | 12 |
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| Referring domains (Majestic) | 153 | 1 |
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5 details filled in for both companies.
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