Alloy vs What The Diff (2026): Pricing, Features & Which to Choose

Who comes out ahead

Based only on the facts in our directory. The right pick still depends on the job you need done.

Lower starting price
Not comparable
Not comparable: Alloy does not list a price
Free plan
Tie
Both have one
Higher rating
Alloy
3.9 against 3.5
Same job?
Yes
Both are Coding tools

Side by side

Compared on	Alloy	What The Diff
Our rating	3.9Better	3.5
Starts at	Free	Free
Free plan	Yes	Yes
Category	Coding	Coding
Plans	Free	Free
Key features	Prototypes against your real codebase, not a disconnected sandbox Browser capture or direct repository connection Generates real GitHub pull requests Claude or ChatGPT model selection with bring-your-own-subscription 20+ SaaS integrations and MCP connector support	AI-generated plain-English PR descriptions from diff analysis Simplified summaries for non-technical stakeholders Weekly progress reports across all changes Public changelog sharing with JSON API No local code storage - reads via GitHub/GitLab API
Pros	Works against the real codebase, skipping the usual prototype-to-production rebuild Named users include Harvey, Amazon and Redis Bring-your-own-subscription option for cost transparency	Removes a genuine, widely-felt friction point (writing PR descriptions) Free tier covers a meaningful volume (~10 PRs/month) before paying Doesn't store code locally - reads directly via API
Cons	Two bills if using bring-your-own-subscription alongside Alloy credits AI-generated pull requests against a live codebase need normal PR review rigour No specific pricing figures published	Token-based pricing means heavy PR volume requires a paid tier quickly Unused tokens don't roll over between billing cycles AI-written descriptions still benefit from a human sanity check on accuracy
Company	Alloy	What The Diff

Prices come from each vendor's pricing page, last checked 20260826. Check the vendor before you buy.

FAQ

Questions people ask

Is Alloy better than What The Diff?

In our reviews Alloy scores 3.9 and What The Diff scores 3.5. The better pick depends on the job. Alloy: Prototypes changes against your real codebase, and Harvey and Amazon are named users. What The Diff: AI reads your pull request diff and writes the description in plain English - plus weekly change summaries for non-technical stakeholders who'll never open GitHub.

Which is cheaper, Alloy or What The Diff?

Alloy: free. What The Diff: free.

Do Alloy and What The Diff have free plans?

Yes, both have a free plan.

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