Graphite

Graphite is a code-review and collaboration platform built around stacked pull requests, with an AI reviewer called Diamond that provides real-time feedback and flags bugs and security vulnerabilities. It targets high-velocity engineering teams and sells its core platform by subscription plus Diamond as an add-on or standalone. The stacked-PR workflow is its main differentiator, with AI review layered on top.

Graphite started as a developer productivity platform centered on stacked pull requests, a workflow that breaks large changes into small, dependent PRs to speed up review and merging. It has since layered on AI with Diamond, an agentic code reviewer that provides real-time feedback on pull requests and detects bugs and security vulnerabilities, positioned explicitly as an augmentation to human review rather than a replacement. The company raised a $52M Series B led by Accel with participation from Anthropic and others, bringing total funding to around $81M, and it markets both a subscription for its core review platform and Diamond as a separate add-on or standalone purchase. Graphite is a strong fit for teams that want to modernize their review workflow, not just bolt on a review bot. The stacked-PR model has real productivity benefits for teams shipping frequently, and Diamond adds AI review on top. Teams uninterested in changing their branching workflow may get less differentiation, since the AI review alone competes in a crowded field.