Altova DiffDog vs Diffchecker
Altova DiffDog
altova.com
Diffchecker
diffchecker.comSide by side
| Figure | Altova DiffDog | Diffchecker |
|---|---|---|
| Price from | — | $15/mo |
| Free plan | — | Yes |
| Free trial | Yes | Yes |
| Open source | — | — |
| Web | — | Yes |
| Windows | Yes | Yes |
| macOS | — | Yes |
| Linux | — | Yes |
| iOS | — | Yes |
| API | — | Yes |
| Plans published | 2 | 8 |
| Spec score · File Comparison Software | 8.3 (#4) | 9.2 (#1) |
| Spec score · Diff and Merge Tools | 8.3 (#4) | 9.2 (#2) |
| Intended users | Altova describes DiffDog as a technical diff/merge tool for developers and IT professionals. | The site describes use cases for developers and engineers, writers and editors, and data and operations teams. |
| Trial | The trial unlocks all features for 30 days after the user requests an evaluation license, which is sent by email. | The Desktop product page advertises a 14-day trial with no credit card required. |
Plans
Altova DiffDog
- DiffDog 2026 Professional Edition$189, paid once
- DiffDog 2026 Enterprise Edition$269, paid once
Diffchecker
- API BasicFree
- BasicFree
- Pro + Desktop$15 a month
- Diffchecker Legal$20 a month
- Enterprise$40 a month
- API Standard$99 a month
- API Business$299 a month
- API EnterprisePriced on request
In their own words
Altova DiffDog
Altova DiffDog has no write-up on Specifiction yet; its figures are above.
Diffchecker
Diffchecker compares text, code, and data in a browser or offline with its desktop app, highlighting additions, removals, and edits. Text comparisons can use side-by-side or unified views, adjustable precision, custom ignore rules, syntax highlighting, real-time editing, and change merging. Listed comparison options also include documents, images, spreadsheets, and folders, with features such as OCR, redlines, formula detection, and batch comparison. Basic is free, but some tools have monthly use limits: unified view and real-time editing each allow five tries, while character-level differences and merge changes each allow ten. Pro + Desktop costs $15 a month per user and includes offline comparisons with desktop apps for Windows, Mac, and Linux. Legal costs $20 a month per user and adds iManage integration and comparison-setting profiles. Enterprise costs $40 a month per user with annual billing, and includes SAML SSO, SCIM provisioning, and dedicated support. Browser comparisons stay in the browser unless saved and shared; Desktop comparisons run locally. The site states browser traffic is TLS-encrypted and its security program is ISO/IEC 27001 certified.