SonOf vs stitch-skills: Features, Pricing & Which Is Better (2026)

A side-by-side comparison of SonOf and stitch-skills — features, pricing, and ideal use cases — to help you decide which AI tool fits your workflow.

SonOf

Fulcrum

Paid

Agentic engineering service that connects to your repo and PM tool, writes tickets, and ships the ones you approve.

Agentic Codebase Audit: A 24-hour scan of your repo, tickets, docs, and Slack that produces a readiness score plus a prioritized list of security, tech-debt, and architecture findings.
Backlog Generation: Writes tickets — both from the audit and enriched versions of your existing backlog — with story-point estimates and dollar costs in plain English.
Senior Engineer Review: Every ticket is checked by a human tech lead who assigns story points, defines acceptance criteria, and signs off before code ships.
Approve-Before-Ship Workflow: You pick which tickets to build; SonOf only ships what you approve, then bills the story points on deploy.
Multi-Stack Coverage: Supports common modern web stacks (TypeScript, Python, Rails, PHP, Java, Go), mobile (Swift, Kotlin, React Native, Flutter), and infrastructure (AWS, Vercel, Cloudflare, GCP, Kubernetes, Docker).
Existing-Team Integration: Runs on your repo, follows your conventions, and opens PRs through your CI/CD pipeline so in-house engineers review its work like any teammate's.
Tests, Bug Fixes, and DevOps: Ships unit, integration, and end-to-end tests as part of every feature ticket, and handles DevOps work like CI/CD configuration, deployment pipelines, and monitoring setup.

Inheriting a Legacy Codebase: Solo founders who shipped v1 with a freelancer or agency use SonOf as their entire engineering function without hiring a CTO.
Scaling a Small Team: Founder-led startups with 1-5 in-house developers offload routine bug fixes, small-to-medium features, and refactors so the internal team can focus on architectural work.
Unblocking a Stalled Roadmap: 10-30 person engineering teams that can't hire fast enough use SonOf as additional throughput to clear the backlog without restructuring.
Legacy Onboarding in 24 Hours: Products with large, undocumented codebases run the agentic audit to get a full context knowledge base in a day instead of weeks of ramp-up.
Fixing Security and Tech Debt: Teams surface exposed secrets, missing CSP headers, unmaintained dependencies, and duplicated auth logic through the audit and ship the fixes on story-point pricing.

Google Labs Code

Free

Open-source collection of agent skills and plugins for Google Stitch that plug into Codex, Claude Code, Cursor, and Gemini CLI.

Cross-Agent Plugin Bundles: Ships stitch-design, stitch-build, and stitch-utilities as marketplace plugins that install into Codex, Claude Code, Cursor, Antigravity, or Gemini CLI.
Code to Design: Convert frontend code (React, Vue, etc.) into a Stitch design by extracting HTML, applying the design system, and uploading it to a Stitch project.
Generate Design: Create new screens from text or images, edit existing screens, and produce dark-mode or high-density design variants.
Design System Management: Upload a DESIGN.md and apply the theme across all screens in a Stitch project.
Extract Design MD: Scan a codebase and generate a comprehensive DESIGN.md describing the design system directly from source.
Static HTML Extraction: Capture self-contained static HTML from running web apps with CSS and images inlined for handoff.
React / React Native / shadcn Codegen: Convert Stitch designs to production-ready React components, React Native code, or shadcn/ui-integrated apps.
Remotion Walkthrough Videos: Generate video walkthroughs of a Stitch project with smooth transitions and zooming.

Migrating a Codebase to a Design System: Upload an existing frontend into Stitch to run a design migration project with consistent tokens and theming.
Rapid Screen Generation: Product teams generate mobile or web screens from short prompts and iterate on variants without leaving the coding agent.
Code Handoff from Design: Convert Stitch screens into React or React Native components so engineers can consume the design in the target framework.
Design System Extraction: Reverse-engineer a DESIGN.md from an existing repo to formalize implicit design tokens and share them across teams.
Design Reviews and Walkthroughs: Automatically produce video walkthroughs of a project to share with stakeholders and reviewers.
Agent-Native Workflows: Developers who live inside Claude Code, Cursor, or Codex install Stitch skills locally to drive design work from the same agent they use for coding.