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Parker Rex DailyMarch 13, 2025

Cursor vs Windsurf vs Cline: Who REALLY Innovates?

Parker Rex weighs Cursor, Windsurf, and Cline to reveal who truly innovates in AI—startup lessons and real-world AI services.

Show Notes

Parker dives into which AI tooling is actually innovating faster, testing Cursor, Windsurf, and Klein in real-world workflows, and sharing actionable tips you can apply today.

Cursor, Windsurf, and AI Pane updates

  • Cursor updates keep changing, and the UI is easy to miss if you don’t follow the changelog.
  • The old Composer UI was renamed/replaced with an AI Pane; you access Chat, Agent, and Edit from a drop-down instead of a separate window.
  • Key features to know:
    • Agent for multi-step file edits (find/replace, inline diffing).
    • Edit mode is a newer, less-used option; most rely on Agent for code changes.
  • Practical tips:
    • Check the change log to verify version vs. what you’re seeing.
    • On macOS, use Homebrew to ensure you’re on the latest Cursor build.
    • When in doubt, update and reopen the app to sync with newer flows.

No-code tools in client work: when to customize vs. bake it in

  • No-code tools are getting more capable, but many client needs still demand customization.
  • Webflow, Wix, and similar tools are great for baseline sites; for bespoke interactions, you’ll still need code.
  • Slater (Andy Slater) lets you embed live scripting into Webflow via a dedicated VM, giving you real-time, production-like customization without full-stack builds.
    • You can drop in files, run code, and deploy quickly; easier testing and iteration than traditional Webflow handoffs.
  • Practical notes:
    • For advanced UI/animations, consider combining no-code bases with Slater or similar live-coding integrations.
    • If you’re reusing components (Swiper, etc.), hosting via CDN and wiring through Slater can save time.

Klein best practices and context management

  • Big theme: let Klein run free at the start; don’t micromanage every decision.
  • Context and tokens:
    • Keep the context window under 100k tokens; be mindful of hitting 150k–170k tokens for checkpoints.
    • Create modular files to avoid bloated contexts.
  • Plan-first approach:
    • Use a Plan mode first to outline the big picture before diving into code.
    • If it takes 30+ files to make a plan, your prompt needs work.
  • Logging as debugging superpower:
    • Implement a five-level logger and log everything during CI to trace issues.
    • Add a logger utility and a Readme in each folder to document usage.
    • Update custom instructions to enforce concise, technical responses and to leverage the logger.
  • Practical steps:
    • Add a dedicated log utility and a per-folder README.
    • Use Plan first, then execute with modular, well-documented files.

PRD prompts workflow with Grok3 and a Line Rider example

  • Demonstrated a PRD-driven workflow inside Grok 3 to plan, test, and implement features.
  • Process highlights:
    • Feed Grok context (homepage, signup flows, footer, etc.) and outline a Line Rider PRD prompt.
    • Include mechanics and user stories; generate a concrete plan and changes to codebase.
    • Run smoke tests and use the PRD to drive migrations, tests, and feature updates.
  • Takeaways:
    • A PRD-centric prompt flow can align teams and accelerate iterative development.
    • Pair PRD prompts with tests and logging for robust, verifiable changes.

Subscriptions: source attribution and production flow

  • Implemented a new source column for subscribers and a corresponding migration.
  • Updated tests and UI to capture where signups come from; pushed changes and monitored deployment.
  • Lesson: ensure backend migrations are pushed before tests and production signups to avoid false negatives.

Quick takeaways

  • Use Klein’s best practices: run free first, plan before coding, keep contexts modular, and monitor token usage.
  • Build a robust logging strategy with a five-level logger and per-folder READMEs.
  • Leverage Plan-first prompts and Grok3-driven PRDs to guide large features.
  • Use Slater for Webflow when you need true in-browser customization without a full rebuild.
  • Track signup sources to inform marketing and product decisions; verify migrations before production pushes.