Diff Doc
Diff Doc: A capable Windows comparison tool with broad format coverage and a high one-time price. Ranked #9 of 25 in Document Comparison Software by our editors (8.2/10); pricing: 30-day trial; best for windows users needing many report formats.
At a glance
- Editor score8.2 / 10
- Pricing30-day trial
- Best forWindows users needing many report formats
- Free planNo
- Paid from$299.95/user one-time
- PDF comparisonYes
- Founded1999 · Santa Monica, California, United States
- Facts checked20 Sep 2026
Where it wins
- Compares PDF, Office, RTF, HTML, XML, and plain-text files
- Detects paragraph-, word-, and letter-level differences
- Generates Word, HTML, text, and CSV comparison reports
Where it doesn't
- Windows desktop deployment limits platform choice
- No free plan is available
- The one-time starting price is relatively high
Our verdict on Diff Doc
Diff Doc is a Windows desktop application from SoftInterface, Inc. for comparing documents, files, and folders. It covers PDF, Word, Excel, PowerPoint, RTF, HTML, XML, plain-text, and other file types, with paragraph-, word-, and letter-level difference detection. Side-by-side and unified views, customizable highlighting, and report generation make it suited to individuals, legal and accounting teams, and business workflows that require repeatable comparisons.
Pricing uses perpetual, one-time licenses rather than subscriptions. Diff Doc Standard costs $299.95 one time and includes text file comparison, folder comparison, HTML/XML scripting, and a perpetual license. Diff Doc Professional costs $499.95 one time and adds PDF comparison, Word, Excel, and PowerPoint comparison, plus RTF, HTML/XML, and WordPerfect comparison. A 30-day free trial is available, but there is no free plan. The Professional tier is the relevant choice for teams working across PDF and Office formats, while Standard fits narrower text-focused workflows.
The product’s strongest differentiator is its combination of detailed comparison controls and workflow output. Users can customize change highlighting, compare folders, generate Word, HTML, text, or CSV reports, and run comparisons through command-line automation. Worldox and ActiveX COM integrations extend its fit for document-management and repeatable business processes. Diff Doc is a practical choice for Windows users who need broad format coverage, report formats, and automation in a desktop tool. Organizations requiring a web or non-Windows deployment should consider a different product, and buyers with occasional comparison needs may find the one-time cost difficult to justify.
Your product? Our editors can test Diff Doc in depth and publish a review, labelled as paid · from $149/mo →
Diff Doc pricing
All 2 Diff Doc plans and prices →
Diff Doc fact sheet
| Free plan | No |
|---|---|
| Paid from | $299.95/user one-time |
| PDF comparison | Yes |
| Office file comparison | Yes |
| Formatting changes | Yes |
| Redline output | Yes |
| Deployment | Desktop |
| Maximum file size | Not verified |
| Free trial | 30 days |
| Money-back guarantee | 30 days |
| Deployment | Desktop |
| Platforms | Windows |
| Support | Email, Live chat, Docs |
| Built for | Solo, Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 2 integrations: Worldox, ActiveX COM |
| Pricing | 30-day trial (source) |
| Website | softinterface.com |
| Facts checked | 20 Sep 2026 |
Diff Doc integrations
Diff Doc lists 2 integrations on its own site.
- Worldox
- ActiveX COM
Alternatives to Diff Doc
- DiffcheckerA broad comparison toolkit with free access and a $15 monthly desktop tier.9.3
- Litera CompareA broad comparison toolkit for redlines, scanned PDFs, and server-side workflows.9.2
- UltraCompareA broad desktop comparison suite for technical teams that need three-way merges.9.0
See all Diff Doc alternatives →
Used Diff Doc? Be the first to review it
The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used Diff Doc for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.
Write a reviewTwo minutes · verified accounts only · read by an editor before it appears
Featured on iTechGuides
Diff Doc is listed in our Document Comparison Software directory. Add the badge to your site — it links back to this page.
<a href="https://www.itechguides.com/products/diff-doc/"><img src="https://www.itechguides.com/best/badge/diff-doc.svg" alt="Featured on iTechGuides" width="230" height="46"></a>
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
Last updated · How we research and update