Code review for teams that care

Ship code worth
maintaining.

Mergewise reviews every pull request for design quality — anti-patterns, code smells, and structural problems that erode maintainability over time.

View on GitHub See Features

How It Works

Install the App

Add Mergewise to your GitHub repository. One click, no config file needed to start.

Push a PR

Open a pull request. Mergewise analyses the diff using AST parsing and structural LLM review.

Get Suggestions

Receive inline refactoring suggestions with confidence scores. Concrete improvements, not vague warnings.

Features

AST Pattern Detection

Parses your code into abstract syntax trees. Detects anti-patterns and code smells structurally, not with regex guesswork.

export function processOrder(req) { validate(req); send(req); log(req); charge(req); save(req); }

god function — 5 responsibilities

LLM-Powered Review

Uses structural signals from the AST as context for LLM analysis. The model sees code structure, not just text.

▶ class handles parsing, validation, and storage

Confidence Gating

Every finding carries a confidence score. Low-confidence noise never reaches your PR. You only see what matters.

92%

pass

61%

skip

34%

skip

Rule-Driven Checks

A growing catalogue of rules targeting real-world anti-patterns and code smells. Each rule is tested against known fixtures.

✓ no-explicit-any

✓ prefer-readonly

✓ no-barrel-imports

Refactoring Suggestions

Every finding includes a concrete suggestion — a design pattern to apply, a principle to follow, or an idiom to adopt.

− new EmailService().send(user)

+ this.notifier.send(user)

suggestion Inject the dependency — don't instantiate inline

Clean Code Standards

Reviews against established design principles, architectural patterns, and language idioms. Keeps your codebase readable and maintainable as it grows.

0 quality score 100

src/handlers/checkout.ts L31–L42

31if (cart.items.length > 0) { 32 if (user.verified) { 33 if (hasStock(cart)) { 34 if (payment.valid) { 35 processOrder(cart);

mergewise-review bot

clean-code: Nesting depth of 4 — this is hard to follow and test. Invert conditions with early returns to flatten the logic.

Suggested change

− if (cart.items.length > 0) { − if (user.verified) { + if (!cart.items.length) return; + if (!user.verified) throw ...;

See It in Action

Mergewise posts inline suggestions directly on the lines that matter. Each finding explains the smell, the principle behind it, and how to refactor.

Catches what linters miss — structure, coupling, complexity
Confidence-scored — noise never reaches the PR
One-click suggested fixes, ready to commit

They Catch Bugs. We Improve Design.

AI code reviewers are great at finding bugs, security issues, and correctness problems. Mergewise does something different.

What Others Do Well

Bug detection and correctness checks
Security vulnerability scanning
Performance issue identification
Documentation and test coverage gaps

What Mergewise Adds

Design quality and refactoring suggestions
Anti-pattern and code smell detection
Idiomatic, maintainable, readable code
Structural analysis via AST
Confidence-gated findings

FAQ

What languages does Mergewise support?

TypeScript and React are supported today with deep structural analysis. Support for additional languages is coming soon.

How is this different from ESLint?

ESLint catches syntax and style issues. Mergewise detects higher-level anti-patterns using AST analysis combined with LLM review — things like manual object construction that should use a factory, scattered event handling that should be consolidated, or prop drilling that suggests a missing context.

Will it spam my PRs with noise?

No. Every finding is confidence-gated. If the analysis isn't confident enough, the finding is suppressed. You can also configure thresholds and enable or disable specific rules via a .mergewise.yml file.

Is it free?

Mergewise is open source and in active development. It's free to self-host. Pricing for a hosted service will be announced when it launches publicly.

How do I set it up?

Install the GitHub App on your repository. Mergewise analyses pull requests automatically — no configuration file required to start, though you can customise rules via a .mergewise.yml file.

Ship code worth maintaining.