Free diagnostic tools for ambitious engineering teams.
We built these interactive utilities to help founders, CTOs, and developers rapidly audit security postures, estimate development scopes, and fix brittle code prototypes.
AI Code Smells & Security Auditor
Harden AI prototypes in secondsPaste code from Cursor, Bolt.new, Lovable, or Claude Code. Detect client secret leaks, unauthenticated Server Actions, infinite loops, and SQL injection flaws with instant 1-click refactored fixes.
SaaS Project Scope & Cost Estimator
Model timelines, budgets & tech specsConfigure your web application archetype and feature modules. Instantly estimate engineering weeks, investment ranges, monthly cloud bills, and a custom Next.js 16 + PostgreSQL architecture spec.
Security Headers & SSL Inspector
Audit OWASP headers & SSL complianceScan any public domain for essential HTTP security headers (CSP, HSTS, X-Frame-Options, CORS) and get instant copy-paste configuration snippets for Next.js, Cloudflare, and Nginx.
Headless Migration ROI Calculator
Quantify speed gains in annual revenueAudit your live Core Web Vitals (Mobile LCP) and calculate the exact annual revenue your business is losing to slow load times using verified Deloitte and Google e-commerce speed benchmarks.
Need these diagnostics resolved by senior engineers?
If your prototype audit reveals critical security leaks, sluggish performance, or complex architectural gaps, our senior engineering team can audit, rebuild, and deploy your production web application in days.
Why JoinAffix builds free developer utilities.
Too many development tools are gated behind paywalls or sell user scan data. We believe high-performance engineering practices—from OWASP headers to clean Next.js server boundaries—should be transparent and immediately verifiable.
Code snippets and URLs are evaluated ephemerally and never persisted to databases or used in AI training.
Every suggestion comes with tested, drop-in TypeScript and Next.js App Router code snippets.
Updated weekly for Next.js 16, React 19 Server Actions, and modern browser security standards.
Have a web problemworth solving?
Whether you're building from scratch, modernizing a legacy system, or rescuing an unfinished AI prototype — work directly with the engineers who will build, fix, and run it.
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