hydrogen

Merge with confidence.

Merge with
confidence.

Context-first PR reviews that make complex changes reviewable.

Built for agent-generated PRs.

View Demo

The problem

Agent-generated PRs have broken code review.

AI coding tools are shipping PRs with 50, 100, even 500 files changed. Traditional review workflows were never built for this — and it shows.

Lost in the noise

PRs with 50+ files make it impossible to see what actually matters. Critical changes get buried in formatting updates and config tweaks.

No context

Reviewing commit-by-commit doesn't show how changes relate. You're forced to piece together the story yourself across dozens of files.

Wasted time

Hours spent context-switching between unrelated changes. You review the same file multiple times without realizing it.

feat: refactor auth system · #142 · 5 slices

Slice progress 2 of 5 approved

Backend Reviewing

14 files · MED risk

api/handlers/auth_handler.go +42

api/middleware/session.go +18 -7

+ 12 more files

continues working — PR stays open

Introducing Slices

One Large Pull Request.
Reviewed one slice at a time.

Hydrogen automatically groups your PR into logical slices — Database, Auth, Backend, Frontend, Tests — each with a risk score. Your team works through them one at a time, with full context for each.

Structured, not overwhelming No more scrolling through 200 files with no sense of what matters. Each slice is a focused, reviewable unit.

Risk-scored automatically Database migrations and auth changes are flagged HIGH. Tests and docs are LOW. Your attention goes where it counts.

No changes to your GitHub workflow No new merge rules. No blocking checks. Hydrogen sits alongside GitHub — your team keeps working exactly as before.

Up and running in minutes

Install once. Every PR your team opens is automatically structured for review.

Install GitHub App

Connect Hydrogen to your repositories. We automatically sync all open pull requests and keep them up to date.

PRs are sliced

Related changes are automatically grouped into logical slices. Migrations, auth changes, backend, frontend—each gets its own context.

Review with full context

Work through slices one at a time — each with its own risk score and file list. No more getting lost in a 200-file diff.

Why not just use AI?

Built on rules, not guesses.

AI reviewers hallucinate, miss context, and give you false confidence — especially on the large, complex PRs where accuracy matters most. Hydrogen uses deterministic rules to slice your PR the same way, every time.

No hallucinations Every slice is computed from file patterns and dependency rules. No surprises, no invented context.

Auditable decisions You can see exactly why a change landed in a slice. Rules, not a black box.

Stable across refreshes The same PR produces the same slices. Always. Your review context doesn't vanish between sessions.

feat: refactor auth system · #142 · 47 files

Database HIGH RISK

Matched by: *.sql, */migrations/*

migrations/20240301_add_sessions.sql

+ CREATE TABLE user_sessions (
+ id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+ user_id INTEGER REFERENCES users(id),
+ expires_at TIMESTAMPTZ NOT NULL
+ );
- ALTER TABLE users ADD COLUMN session_token TEXT;

Everything your team needs to review with confidence

Built to slot into your existing git workflow — no new process, no overhead

Smart Slicing

Changes are automatically grouped by file type, patterns, and dependencies. Deterministic and stable—no magic, just rules.

Risk Scoring

Each slice gets a risk level—HIGH for migrations and auth, LOW for docs. Focus your attention where it matters most.

GitHub Native

Works with your existing git workflow. No new branching rules, no merge automation, no blocking checks. Just better reviews.

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