KDiff3 vs Altova DiffDog

KDiff38.8Visit Altova DiffDog8.4Visit

Higher score KDiff3 #3 in File Comparison Software 8.8/10 Open source ✓ 2 of 5 features Visit KDiff3

vs

Altova DiffDog #6 in File Comparison Software 8.4/10 30-day trial Free trial✓ 2 of 5 features Visit Altova DiffDog

• KDiff3 fits best

  Free cross-platform three-way merging

• Altova DiffDog fits best

  Windows teams comparing files, XML, and databases

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.

Side by side

Feature	KDiff3 8.8/10 Visit ↗	Altova DiffDog 8.4/10 Visit ↗
At a glance
Editor score	8.8	8.4
Ranking	#3 in File Comparison Software	#6 in File Comparison Software
Best for	Free cross-platform three-way merging	Windows teams comparing files, XML, and databases
Pricing model	Free	Paid
Starting price	Open source	—
Free plan	Not checked yet	—
Free trial	—	30 days
Deployment	Desktop	Desktop
Platforms	Windows, macOS, Linux	Windows
Support	Community, Docs	Tickets, Docs, Community
Integrations	2 integrations	3 integrations
Built for	Solo, Small business	Small business, Mid-market, Enterprise
Features KDiff3 2/5 · Altova DiffDog 2/5
Three-way merge	✓	✓
Folder comparison	✓	✓
Merge conflict tools	Not checked yet	Not checked yet
Binary comparison	Not checked yet	Not checked yet
Version-control support	Not checked yet	Not checked yet
Specs
Supported platforms	Not checked yet	Not checked yet
Our review
Pros	Supports two- and three-file comparison and merging Compares and merges folders across Windows, macOS, and Linux Offers editable conflict resolution with Git integration	Supports two-way and three-way file comparison and merging Covers folders, XML, CSV, Word, ZIP, and database content Integrates with Git and generates text, XML, or HTML diff reports
Cons	Desktop-focused rather than browser-based Integration options center on Git and KIO Does not provide syntax highlighting	Windows desktop support only No free plan; access is through paid editions or a 30-day trial Enterprise capabilities are required for Word, CSV, and database comparison
Our verdict	KDiff3 is an open-source desktop diff and merge utility from KDE for developers and technical users. It compares two or three text files, compares and merges folders, and presents differences line by line and character by character. Its… Read the review →	Altova DiffDog is a Windows desktop application for developers and IT professionals who need to compare, merge, and synchronize varied file and data formats. Its scope extends from text and source-code files to folders, XML and JSON… Read the review →

Strengths and trade-offs

• KDiff3 — where it wins

  • Supports two- and three-file comparison and merging
  • Compares and merges folders across Windows, macOS, and Linux
  • Offers editable conflict resolution with Git integration

  Where it doesn't

  • Desktop-focused rather than browser-based
  • Integration options center on Git and KIO
  • Does not provide syntax highlighting

• Altova DiffDog — where it wins

  • Supports two-way and three-way file comparison and merging
  • Covers folders, XML, CSV, Word, ZIP, and database content
  • Integrates with Git and generates text, XML, or HTML diff reports

  Where it doesn't

  • Windows desktop support only
  • No free plan; access is through paid editions or a 30-day trial
  • Enterprise capabilities are required for Word, CSV, and database comparison

• KDiff38.8/10 · Open source

  A free, open-source desktop utility for detailed two- and three-way file merging.

  Visit KDiff3Full verdict →
• Altova DiffDog8.4/10 · 30-day trial

  A broad Windows comparison tool for teams working across files, XML, folders, and databases.

  Visit Altova DiffDogFull verdict →