# DiffDuo vs What the Diff

DiffDuo records 0 monthly visits with 0% month-over-month growth and Free pricing. What the Diff records 1,113 monthly visits with -59.8% growth and Freemium pricing.

| Metric | [DiffDuo](https://openaitools.app/tool/diffduo) | [What the Diff](https://openaitools.app/tool/whatthediff) |
| :--- | :--- | :--- |
| Website URL | https://diffduo.com | https://whatthediff.ai |
| Categories | AI Code Review, AI Summarizer, Large Language Models (LLMs), AI Code Assistant | AI Code Review, AI Code Assistant, AI Copilot, AI GitHub |
| Pricing Model | Free | Freemium |
| Monthly Visits | 0 | 1,113 |
| MoM Growth Rate | 0% | -59.8% |
| Primary Market | Global | United States |
| Direct Visits | 0 | 435 |
| Review Score | 4.1 | 4.2 |
| Saved Count | 1 | 5 |
| Supported Platforms | Website | Website |

## DiffDuo

DiffDuo is a lightweight diff checker that runs entirely client-side. You paste text into the Original and Changed boxes, or drag and drop plain-text files up to 50 MB each, and the tool renders the differences as you type. Removed lines are shown in red, added lines in green, and the specific words or characters that changed are highlighted with a darker background inside modified lines. You can switch between a two-column split view and a single-column unified view that follows the same format as git diff and patch files, with hunk headers such as @@ -12,7 +12,9 @@ and collapsed unchanged regions.

Practical comparison controls include ignore whitespace and ignore case toggles, a configurable context setting (3 lines, 10 lines or full file), and a copy-patch button. Long jobs such as files with 100,000+ lines are processed on a background thread so the page stays responsive. The interface is available in a wide range of languages including English, Turkish, Spanish, Portuguese, French, German, Italian, Dutch, Polish, Russian, Ukrainian, Arabic, Hindi, Indonesian, Vietnamese, Japanese, Korean and Simplified Chinese.

The tool is intentionally narrow in scope. It is not an AI code review service and does not summarise pull requests; it is a fast, private diff viewer for the moments when you want to see exactly what changed between two blocks of text. DiffDuo is free to use with no sign-up, no account, no cap on the number of comparisons and no advertising. Companion pages cover JSON comparison and list comparison, both of which also run locally in the browser.

**Pricing & Plans:** DiffDuo is completely free: no sign-up, no account, no limit on the number of comparisons and no ads. Comparison runs locally in your browser.

- **Split and unified views:** Read changes in two columns side by side, or switch to a single-column unified diff in the same format as git diff and patch files.
- **Word-level highlighting:** Darker highlights mark the exact words and characters that changed inside a modified line, not just the lines that differ.
- **Local, private processing:** The comparison runs entirely in your browser, so confidential code, contracts and config files never leave your device.
- **Whitespace and case tolerance:** Ignore whitespace, indentation and capitalisation differences, and control how much unchanged context is shown around each change.
- **Large-file handling:** Compares plain-text files up to 50 MB in a background thread, so pages with hundreds of thousands of lines do not freeze the UI.

**Strengths:** Runs fully in the browser, so sensitive text and code are never uploaded; Free with no sign-up, no usage limits and no advertising; Word-level highlighting makes edits inside a line easy to spot; Unified view matches git diff and patch format, including hunk headers

**Limitations:** Limited to plain-text comparison, with no semantic or AI-based code review; No account, saved history or team collaboration features; Requires JavaScript to be enabled in the browser; No desktop or command-line client, so it is a manual copy-and-paste workflow

[Profile (Markdown)](https://openaitools.app/tool/diffduo.md)

## What the Diff

What the Diff plugs into GitHub or GitLab and works where developers already are. When you open a pull request, it reads the diff through the provider API and generates a descriptive comment explaining what changed, why it likely changed, and what reviewers should pay attention to. The result is a first draft of PR context that a reviewer would otherwise have to reconstruct by reading the patch.

Beyond PR descriptions, the product covers summary notifications pushed to Slack, email, or webhooks so non-technical teammates stay informed, weekly reports that aggregate a team's progress, inline refactoring where you can request improvements in a comment and let the AI draft the change, and public changelogs that can be published or pulled into other tools through a JSON API. Granular controls let you choose repositories, skip CI pull requests, delay drafts, and manage token usage.

What the Diff is built by Beyond Code and follows a token-based usage model: each diff consumes tokens, with an average pull request costing roughly 2,300 tokens. The company states that it does not store your code, that third-party services do not store it either, and that your code is never used to train models. Unused tokens do not roll over between billing cycles.

**Pricing & Plans:** What the Diff is freemium. The Free plan costs $0 per month and includes 25,000 tokens (about 10 pull requests) with unlimited repositories, automated PR descriptions, and inline refactoring. Pro starts at $19 per month for 200,000 tokens (about 40 pull requests) and scales through 500k, 1.5M, and unlimited tiers, adding Slack, webhook, and email notifications plus priority email support. No credit card is required to start, and plans do not upgrade automatically.

- **Automatic pull request descriptions:** Every PR gets a written summary of what changed in plain English, giving reviewers context without digging through the patch.
- **Summary notifications:** Simplified, translated summaries go out via Slack, email, or webhooks to keep non-technical teammates in the loop.
- **Inline AI refactoring:** Request improvements directly in a pull request comment and let the AI help draft the refactoring.
- **Weekly team reports:** Aggregate a week of work into a single clear update so nobody has to chase progress manually.
- **Public changelogs and JSON API:** Publish a public record of what is new, or pull the changelog into your own tools through a JSON API.

**Strengths:** Works inside GitHub and GitLab with no new workflow to learn; Produces genuinely useful plain-English context for non-technical readers; Free tier with unlimited repositories covers light individual use; States clearly that your code is not stored or used for model training

**Limitations:** Token-based usage can be hard to predict for teams with large diffs; Unused tokens do not roll over between billing cycles; Requires full repository access because GitHub and GitLab lack a diff-only permission

[Profile (Markdown)](https://openaitools.app/tool/whatthediff.md)

## Frequently Asked Questions

### How do DiffDuo and What the Diff compare in monthly traffic?

DiffDuo has 0 monthly visits, while What the Diff has 1,113. Traffic estimates describe audience size, not product quality.

### How do their growth rates compare?

DiffDuo has a month-over-month growth rate of 0%; What the Diff has -59.8%.

### How does pricing compare?

DiffDuo: Free. DiffDuo is completely free: no sign-up, no account, no limit on the number of comparisons and no ads. Comparison runs locally in your browser. What the Diff: Freemium. What the Diff is freemium. The Free plan costs $0 per month and includes 25,000 tokens (about 10 pull requests) with unlimited repositories, automated PR descriptions, and inline refactoring. Pro starts at $19 per month for 200,000 tokens (about 40 pull requests) and scales through 500k, 1.5M, and unlimited tiers, adding Slack, webhook, and email notifications plus priority email support. No credit card is required to start, and plans do not upgrade automatically.

## Alternatives

| # | Tool Name | Monthly Visits | MoM Growth Rate | Pricing Model | Summary | Profile (Markdown) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 1 | [Ollama](https://openaitools.app/tool/ollama) | 9,421,973 | +4.3% | Free, Freemium, Paid | Run and build with open AI models locally or in the cloud | [.md](https://openaitools.app/tool/ollama.md) |
| 2 | [Cursor](https://openaitools.app/tool/cursor-sh) | 4,790,129 | +6.5% | Freemium | The AI coding agent that turns ideas into shipped software | [.md](https://openaitools.app/tool/cursor-sh.md) |
| 3 | [Devin](https://openaitools.app/tool/devin) | 2,549,346 | +1% | Paid | Cognition's autonomous software engineer that ships real pull requests | [.md](https://openaitools.app/tool/devin.md) |
| 4 | [Command Code](https://openaitools.app/tool/command-code) | 2,358,177 | -12.1% | Freemium, Contact for Pricing | The coding agent that learns your coding taste | [.md](https://openaitools.app/tool/command-code.md) |
| 5 | [CodeRabbit](https://openaitools.app/tool/coderabbit) | 1,048,880 | +4.6% | Freemium, Free Trial, Paid, Contact for Pricing | AI code review, PR triage, and security monitoring for fast-moving teams | [.md](https://openaitools.app/tool/coderabbit.md) |
| 6 | [DeepWiki by Cognition](https://openaitools.app/tool/deepwiki-by-congnition) | 879,539 | -3.1% | Free | AI-generated wikis and chat for any public GitHub repository | [.md](https://openaitools.app/tool/deepwiki-by-congnition.md) |
| 7 | [Aikido Security](https://openaitools.app/tool/aikido-security) | 757,491 | +9.6% | Freemium | All-in-one AppSec platform that finds and auto-fixes vulnerabilities | [.md](https://openaitools.app/tool/aikido-security.md) |
| 8 | [Macroscope](https://openaitools.app/tool/macroscope) | 106,170 | +39.6% | Free Trial, Paid, Contact for Pricing | AI code review and status updates that keep every repo on track | [.md](https://openaitools.app/tool/macroscope.md) |
| 9 | [Bito](https://openaitools.app/tool/bito) | 63,829 | +9.8% | Freemium, Paid, Contact for Pricing | Context-aware AI code reviews and a model router for coding agents | [.md](https://openaitools.app/tool/bito.md) |
| 10 | [Kodus](https://openaitools.app/tool/kodus-io) | 32,150 | -14.2% | Freemium | Open-source AI code review you can self-host or run in the cloud with your own model keys | [.md](https://openaitools.app/tool/kodus-io.md) |

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Source: https://openaitools.app/compare/diffduo-vs-whatthediff

More Markdown: [Categories](https://openaitools.app/categories.md) · [Traffic rankings](https://openaitools.app/rankings.md) · [llms.txt](https://openaitools.app/llms.txt)