GitHub Copilot vs What The Diff — Coding & Development AI tool comparison
GitHub Copilot edges out What The Diff for Coding & Development.
Verdict
According to AI Tier List, GitHub Copilot (Tier B) ranks higher than What The Diff (Tier C) for Coding & Development. Most widely adopted AI coding assistant
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Specification comparison
| Attribute | GitHub Copilot | What The Diff |
|---|---|---|
| Tier | Tier B | Tier C |
| Rating | 3 / 5 | 2 / 5 |
| Pricing | Freemium | Freemium |
| Category | Coding & Development | Coding & Development |
| Best For | IDE Plugin, GitHub Integration, Value | code-review, pull-request, developer-tools, ai-explanation, productivity |
GitHub Copilot vs What The Diff: which should you choose?
Choose GitHub Copilot if…
Most widely adopted AI coding assistant
- You want the higher-rated option — Tier B on AI Tier List, above What The Diff at Tier C.
- Your priority is IDE Plugin, GitHub Integration, Value — attributes What The Diff is not tagged with.
Choose What The Diff if…
AI-powered tool explaining code changes in pull requests clearly.
- Your priority is code-review, pull-request, developer-tools, ai-explanation, productivity — attributes GitHub Copilot is not tagged with.
What GitHub Copilot and What The Diff actually do
GitHub Copilot
GitHub Copilot offers the best value at $10/month with unlimited completions. November 2025 added GPT-5.1 and Gemini 3 Pro model options. Offers the strongest GitHub PR review and issue management integration.
What The Diff
What The Diff leverages AI to provide clear and concise explanations for code changes within pull requests (PRs). It aims to help developers reduce code review time and quickly grasp the implications of changes. This tool is particularly useful for development teams needing to easily understand complex code modifications.
Why GitHub Copilot is Tier B and What The Diff is Tier C
Tier BGitHub Copilot
It maintains top-tier competitiveness by offering a robust ecosystem and access to various state-of-the-art models. However, the complex usage-based billing and slower agent performance compared to specialized competitors have negatively impacted the overall user experience.
Tier CWhat The Diff
While What The Diff provides practical features in the niche of automated code reviews, its market position has narrowed as powerful integrated development tools like GitHub Copilot and Cursor now offer similar functionalities natively. It currently lacks the functional breadth and user experience competitiveness compared to general-purpose AI coding tools.
GitHub Copilot vs What The Diff: strengths and weaknesses
GitHub Copilot — Strengths
Top-tier IDE compatibility, seamless GitHub workflow integration, access to multiple state-of-the-art models, massive user base and community support
GitHub Copilot — Weaknesses
Complex and unpredictable usage-based billing, slower agent response times compared to competitors, suspension of new sign-ups for the free student plan
What The Diff — Strengths
Clear code change summaries, Reduced code review time, Improved developer productivity, Enhanced PR comprehension
What The Diff — Weaknesses
Feature overlap with powerful integrated tools, Declining market share, Limited functional scalability
Recent changes to GitHub Copilot and What The Diff
GitHub CopilotAug 2026
Added Claude Opus 5 and Grok 4.5 models, full transition to usage-based AI Credits model, temporary suspension of new sign-ups for the free student plan
What The DiffJul 2026
Focusing on stabilizing code review summaries and automated PR descriptions, but the pace of innovative updates in the market has somewhat stagnated.
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FAQ
Which is better, GitHub Copilot or What The Diff?
According to AI Tier List, GitHub Copilot (Tier B) ranks higher than What The Diff (Tier C) for Coding & Development. Most widely adopted AI coding assistant
How much do GitHub Copilot and What The Diff cost?
GitHub Copilot is freemium, while What The Diff is freemium.
What is the difference between GitHub Copilot and What The Diff?
GitHub Copilot — Most widely adopted AI coding assistant. What The Diff — AI-powered tool explaining code changes in pull requests clearly.. Where GitHub Copilot falls short: Complex and unpredictable usage-based billing, slower agent response times compared to competitors, suspension of new sign-ups for the free student plan. Where What The Diff falls short: Feature overlap with powerful integrated tools, Declining market share, Limited functional scalability.
Is GitHub Copilot still worth it in 2026?
Right now GitHub Copilot is rated Tier B for Coding & Development. It maintains top-tier competitiveness by offering a robust ecosystem and access to various state-of-the-art models. However, the complex usage-based billing and slower agent performance compared to specialized competitors have negatively impacted the overall user experience. (last re-rated 2026-08-02)
Is What The Diff still worth it in 2026?
Right now What The Diff is rated Tier C for Coding & Development. While What The Diff provides practical features in the niche of automated code reviews, its market position has narrowed as powerful integrated development tools like GitHub Copilot and Cursor now offer similar functionalities natively. It currently lacks the functional breadth and user experience competitiveness compared to general-purpose AI coding tools. (last re-rated 2026-08-02)