SFL
SkillFocusLab Engineering Team
Product Changelog
Every shipped feature, fix, and improvement — timestamped and transparent. We ship weekly.
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v3.4.0
MAJOR
Transparency & Trust Overhaul
NEW Public methodology whitepaper with complete Skill Score formulas, normalization functions, and benchmark data (with sample sizes)
NEW Comparison pages: SkillFocusLab vs Grammarly, TypingClub, Keybr, and Coursera
NEW Published changelog with iteration discipline (this page)
NEW Data retention timeline page with exact retention periods per data type
NEW Editorial authorship signals on all content pages
NEW Admin dashboard with real MRR, cohort retention, activation metrics, and baseline completion rates
NEW Secure admin authentication with username/password (replacing API-key-only access)
IMPROVED Enterprise Teams page with ROI calculator, SLA guarantees, and implementation timeline
IMPROVED AI transparency page with cost breakdowns, model configuration, and rate limits
IMPROVED Baseline UX with progress persistence, motivational copy, and time estimates
SECURITY Stripe webhook HMAC-SHA256 signature validation
SECURITY Idempotent billing processing via processed_events deduplication table
SECURITY Stricter AI rate limiting: per-minute (5/min), per-session (10/15min), daily cap
SECURITY PII scrubbing on all AI prompts (email, phone, SSN, card numbers, addresses)
SEO Structured schema markup (Organization, SoftwareApplication, TechArticle, FAQ) across all pages
SEO Internal linking strategy with contextual cross-links on every page
v3.3.0
Compliance & Audit Framework
NEW Comprehensive compliance page covering GDPR, service disclaimers, AI legal compliance
NEW Senior-level SaaS audit page with architecture review
NEW Entitlement middleware with server-side tier enforcement
IMPROVED Rate limiting on all AI endpoints (per-user, per-session, daily)
v3.2.0
Skill Score v2.1 & Reading Test
NEW Reading Speed Test with comprehension questions and AI coaching
NEW 5-category Skill Score model (added Reading at 15%, adjusted Consistency to 10%)
NEW Level stability rules (hysteresis: 3 days to level up, 5 to level down)
NEW Baseline Assessment — 4-step skill evaluation flow
NEW Weekly skill snapshots with trend charts
v3.1.0
Stripe Integration & Payments
NEW Stripe Checkout integration for secure payments
NEW Webhook signature validation for Stripe events
NEW Multi-tier pricing: Pro ($19/mo) and Pro+ ($39/mo)
NEW Cancellation retention flow with smart offers
IMPROVED Pricing page with annual billing toggle and A/B price testing
v3.0.0
Platform Rewrite — Cloudflare Pages + Hono
NEW Complete platform rewrite on Cloudflare Workers + Hono framework
NEW D1 database with edge-first architecture
NEW AI coaching engine with tiered models, PII scrubbing, and cost tracking
NEW 13 professional development tools
NEW PWA support with offline capability
v2.0.0
Resume Suite & Career Tools
NEW Resume Checker, Resume Score, ATS Checker, Keyword Scanner, Full Review
NEW Writing Tone Analyzer
NEW Promotion Readiness Assessment
NEW Career Skill Gap Analysis
v1.0.0
Initial Launch
NEW Typing Speed Test (easy/medium/hard + custom text)
NEW Grammar Checker with readability scoring
NEW Pomodoro Focus Timer with streak tracking
NEW User accounts with progress tracking
NEW Stripe subscription billing