Guide · Published September 2026 · Based on Diffchecker’s public site and pricing page
We build DiffLists, so treat this with the scepticism any first-party comparison deserves. Diffchecker is the established, well-known name in this space — this is not a claim that DiffLists replaces it, only a factual look at where each one actually fits.
What each tool is actually for
Diffchecker is a general-purpose diff tool: text, code, images (nine comparison modes), Word documents, PDFs, spreadsheets, and, in the desktop app, entire folders. DiffLists is narrower and free: a browser-based tool built specifically around comparing two lists as sets — items only in List 1, only in List 2, the intersection, the union, and the symmetric difference — plus seven single-purpose tools (alphabetizer, duplicates remover, CSV comparer, and more) built on the same engine.
If the job is “show me exactly which lines changed between two versions of a document,” that is Diffchecker’s core use case. If the job is “what’s shared between these two lists, and what’s only in one,” that is what DiffLists is built around.
What is identical
Both let you compare text for free with no signup required. Both accept pasted text or an uploaded file. Both offer a side-by-side or clearly separated view of the result, and both support CSV among their accepted formats.
Where Diffchecker is ahead
- Format range. Images (nine modes: slider, fade, pixel subtraction, and more), Word documents, PDFs, presentations, and — in its desktop app — entire folders. DiffLists compares pasted or imported text-based lists only.
- A desktop app for Windows, Mac, and Linux, with offline folder and batch comparison. DiffLists is browser-only.
- Enterprise features. The Enterprise plan adds SAML SSO and account provisioning via SCIM — relevant for organizations with those requirements. DiffLists has no accounts at all, which is a different kind of simple, not an enterprise substitute.
- Maturity and brand recognition.Diffchecker is the long-established name developers and legal teams already reach for; that track record is real and DiffLists doesn’t have it yet.
Where DiffLists is ahead
- Genuinely free, with no paid tier at all.Diffchecker’s free tier is limited — unlimited access to precision levels, syntax highlighting, and real-time editing require Pro + Desktop at $15/month per user (billed monthly; a discount applies annually), with Legal and Enterprise tiers above that. Every DiffLists tool, including the API, is free with no limit.
- Set operations as first-class results.Only in List 1, only in List 2, intersection, union, and symmetric difference, all in one pass — not something Diffchecker’s line-diff model documents as a direct output.
- No account, ever. Diffchecker lets you compare without an account, but saving, sharing, or upgrading requires one. DiffLists never asks.
- A free, documented public API — POST to /api/compare, no key required — and a free embeddable widget. Diffchecker’s API access sits behind its paid plans.
Use Diffchecker instead if…
You need to compare images, PDFs, Word documents, or entire folders; you want an offline desktop app; or your organization needs SSO and provisioning for a team. Those are real, documented capabilities DiffLists doesn’t have.
Use DiffLists instead if…
You’re specifically comparing two lists and want the intersection, union, and symmetric difference without paying for anything, without an account, or without hitting a feature paywall — and especially if you want to call the comparison from code via a free API or drop it into your own page as an embed.
See the set-comparison results for yourself.
Open the comparison toolFrequently asked questions
Is DiffLists a good alternative to Diffchecker?
For comparing two lists and getting intersection, union, and symmetric-difference results, yes — and it's entirely free. For comparing images, PDFs, Word documents, or entire folders, no — Diffchecker supports those formats and DiffLists doesn't.
Does Diffchecker cost money?
Comparing text is free with no signup. Diffchecker's paid plans (Pro + Desktop, Legal, Enterprise) unlock unlimited access to precision/highlighting features, the desktop app, and enterprise features like SSO — see diffchecker.com/pricing for current rates.
Does DiffLists have a paid plan?
No. Every tool on DiffLists, including the public API and embeddable widget, is free with no account, no signup, and no paid tier.
Can Diffchecker compare two lists and show the intersection?
Diffchecker is built around line/character-level text diffing, not set operations — it doesn't document a dedicated intersection or union output the way DiffLists does.
Which one should I use for comparing two CSV files?
Both support CSV. Diffchecker's spreadsheet comparison shows cell-level changes; DiffLists' CSV comparer treats each row as a list item and reports which rows are only in one file, shared, or combined — pick based on whether you need cell-level or row-level results.