[
  {
    "slug": "client-invoice-and-receipt-generator",
    "title": "Freelance Invoice & Payment Receipt Generator",
    "category": "Productivity",
    "description": "Zero-login client-side invoice and receipt builder with customizable branding, line-item tax calculations, and instant clean print/PDF export.",
    "core_logic": "Manages dynamic line items with quantity, unit pricing, discounts, and multi-currency formatting. Automatically calculates subtotal, configurable sales tax/VAT rates, and balance due. Stores merchant details and logo base64 locally in localStorage and provides print-optimized CSS for clean PDF export.",
    "monetization": "AdSense Auto Ads (ca-pub-9938389941694225) and premium invoice design template upgrades.",
    "tech_stack": "vanilla HTML/Tailwind CDN/JS",
    "status": "completed"
  },
  {
    "slug": "cron-expression-visualizer-generator",
    "title": "Cron Schedule Visualizer & Human-Readable Generator",
    "category": "DevTools",
    "description": "Interactive cron syntax builder and human-readable translator showing next execution runs and execution timelines across timezones.",
    "core_logic": "Parses standard 5-part and 6-part cron expressions into plain English summaries, computes the subsequent 10 upcoming run timestamps in user-selected timezones, and provides an interactive visual time-grid selector for minutes, hours, days, months, and weekdays.",
    "monetization": "AdSense Auto Ads (ca-pub-9938389941694225), copyable crontab configurations, and developer hosting referral links.",
    "tech_stack": "vanilla HTML/Tailwind CDN/JS",
    "status": "completed"
  },
  {
    "slug": "crypto-capital-gains-tax-calculator",
    "title": "Cryptocurrency Capital Gains Tax & FIFO/LIFO Calculator",
    "category": "Finance",
    "description": "Client-side cryptocurrency portfolio tax calculator computing capital gains and losses on trades using FIFO, LIFO, and weighted average cost basis methods.",
    "core_logic": "Parses manual transaction entries or CSV trade history. Matches sell transactions to acquired asset lots using FIFO, LIFO, and Weighted Average cost basis algorithms. Calculates short-term and long-term gains/losses, applies statutory annual capital gains exclusions, and generates an itemized tax schedule.",
    "monetization": "AdSense Auto Ads (ca-pub-9938389941694225) and crypto portfolio tracker / exchange affiliate links.",
    "tech_stack": "vanilla HTML/Tailwind CDN/JS",
    "status": "completed"
  },
  {
    "slug": "json-schema-and-typescript-interface-generator",
    "title": "JSON to TypeScript Interface & Zod Schema Generator",
    "category": "DevTools",
    "description": "Converts raw JSON data structures into strongly-typed TypeScript interfaces, Zod validation schemas, and JSON Schema definitions with automatic type inference.",
    "core_logic": "Recursively parses arbitrary JSON payloads, identifies primitive types, nested objects, optional keys, and homogeneous/heterogeneous array element unions. Emits formatted TypeScript interface definitions with PascalCase naming, Zod validation schemas (`z.object({...})`), or standard JSON Schema (draft-07) specifications.",
    "monetization": "AdSense Auto Ads (ca-pub-9938389941694225) and developer tooling CTAs.",
    "tech_stack": "vanilla HTML/Tailwind CDN/JS",
    "status": "completed"
  },
  {
    "slug": "markdown-table-and-data-matrix-editor",
    "title": "Markdown Table Editor, CSV Converter & Formatter",
    "category": "Productivity",
    "description": "Visual spreadsheet grid for building, formatting, sorting, and transposing Markdown tables with two-way CSV, JSON, and HTML conversions.",
    "core_logic": "Provides an interactive editable data grid supporting row/column addition, removal, column alignment (left, center, right), sorting, and matrix transposition. Features two-way conversion between markdown pipe tables, CSV/TSV strings, HTML table markup, and JSON record arrays, with clean copy-to-clipboard formatting.",
    "monetization": "AdSense Auto Ads (ca-pub-9938389941694225) and technical writing tool recommendations.",
    "tech_stack": "vanilla HTML/Tailwind CDN/JS",
    "status": "completed"
  },
  {
    "slug": "municipal-water-and-electricity-tariff-calculator",
    "title": "Tiered Electricity & Water Incline Block Tariff (IBT) Calculator",
    "category": "Utility",
    "description": "Models monthly household electricity and municipal water utility bills against stepped incline block tariffs (IBT) and fixed service charges.",
    "core_logic": "Calculates multi-tier utility bills using Incline Block Tariff logic (lifeline, baseline, and punitive surcharge tiers) for electricity (kWh) and water (kL). Incorporates monthly fixed basic/meter connection fees, seasonal winter/summer rate adjustments, and statutory VAT additions with step-by-step cost breakdown charts.",
    "monetization": "AdSense Auto Ads (ca-pub-9938389941694225) and smart metering / energy efficiency affiliate banners.",
    "tech_stack": "vanilla HTML/Tailwind CDN/JS",
    "status": "completed"
  },
  {
    "slug": "regex-tester-and-cheat-sheet",
    "title": "Client-Side Regex Tester, Explainer & Code Generator",
    "category": "DevTools",
    "description": "Real-time regular expression tester with live syntax highlighting, match group extractions, ReDoS catastrophic backtracking alerts, and multi-language snippets.",
    "core_logic": "Evaluates strings against dynamic regular expressions supporting standard flags (g, i, m, s, u). Highlights matched spans and capture groups using layered DOM overlays, reports match counts and execution performance, detects potential catastrophic backtracking patterns, and outputs code snippets in JavaScript, Python, PHP, and Go.",
    "monetization": "AdSense Auto Ads (ca-pub-9938389941694225) and developer tooling CTAs.",
    "tech_stack": "vanilla HTML/Tailwind CDN/JS",
    "status": "completed"
  },
  {
    "slug": "sa-payment-gateway-fee-comparator",
    "title": "South African Payment Gateway Fee Comparator (Payfast, Paystack, Yoco, Ozow)",
    "category": "Finance",
    "description": "Compares transaction processing fees, settlement schedules, and net merchant margins across Payfast, Paystack, Yoco, Peach Payments, and Ozow Instant EFT for e-commerce and POS merchants.",
    "core_logic": "Takes monthly transaction volume, average basket size, card vs Instant EFT distribution, and international vs local cards. Computes per-transaction fixed fees + variable percentage fees + 15% VAT for each gateway, showing net payout, fee difference, and recommending optimal provider by turnover tier.",
    "monetization": "AdSense Auto Ads (ca-pub-9938389941694225), affiliate links to gateway merchant signups, and downloadable fee audit PDF.",
    "tech_stack": "vanilla HTML/Tailwind CDN/JS",
    "status": "completed"
  },
  {
    "slug": "sa-sbc-vs-company-tax-calculator",
    "title": "SARS Small Business Corporation (SBC) vs Standard PTY Ltd Tax & CIPC Fee Comparator",
    "category": "Finance",
    "description": "Compares Small Business Corporation (SBC) tax rates against standard 27% Corporate Income Tax (CIT) with eligibility checks, dividend withholding tax, and CIPC annual return fees.",
    "core_logic": "Standard Corporate Income Tax (CIT): Flat 27% on taxable net profit. SBC Tax Brackets (Section 12E of the Income Tax Act): R0 - R95,750: 0%; R95,751 - R365,000: 7% of amount above R95,750; R365,001 - R550,000: R18,848 + 21% of amount above R365,000; R550,001 and above: R57,698 + 27% of amount above R550,000. SBC eligibility validation criteria: Gross turnover <= R20,000,000; 100% natural person shareholding with no shares in other private companies; investment income and personal services income <= 20% of total revenue. Section 12E accelerated depreciation allowance: 100% write-off on manufacturing assets or 50/30/20% regime. CIPC Annual Return statutory fees: Turnover < R1m = R100 (R150 late); R1m to R9.99m = R450 (R600 late); R10m to R49.99m = R2,000 (R2,500 late); R50m+ = R4,000.",
    "monetization": "AdSense Auto Ads (ca-pub-9938389941694225), Payfast compliance report micro-charge, and CIPC partner referral links.",
    "tech_stack": "vanilla HTML/Tailwind CDN/JS",
    "status": "completed"
  },
  {
    "slug": "sa-transfer-duty-and-bond-cost-calculator",
    "title": "South African Property Transfer Duty & Bond Registration Cost Calculator",
    "category": "Finance",
    "description": "Calculates comprehensive property purchase closing costs in South Africa, including SARS transfer duty brackets, bond registration legal fees, conveyancing attorney tariffs, and Deeds Office statutory charges.",
    "core_logic": "Takes purchase price, deposit amount, and bond required. Calculates SARS transfer duty using progressive property tax brackets (R0-R1.1m exempt, 3% to 13%), standard Legal Practice Council conveyancing fee tariff tables + 15% VAT, bond registration attorney fee tables, and Deeds Office sliding registration tiers. Provides itemized cash required breakdown and monthly bond repayment.",
    "monetization": "AdSense Auto Ads (ca-pub-9938389941694225), bond originator affiliate lead capture, and downloadable closing cost estimate summary.",
    "tech_stack": "vanilla HTML/Tailwind CDN/JS",
    "status": "completed"
  },
  {
    "slug": "sa-two-pot-retirement-withdrawal-calculator",
    "title": "South African Two-Pot Retirement Savings Pot Tax & Payout Estimator",
    "category": "Finance",
    "description": "Estimates net cash payout from pre-retirement Savings Pot withdrawals after SARS marginal tax directive withholding and fund fees, plus 10-30 year lost compounding wealth projection.",
    "core_logic": "Two-Pot Retirement System statutory provisions: Savings Component allows 1 withdrawal per tax year prior to retirement, with a statutory minimum withdrawal of R2,000 up to 100% of the available Savings Pot balance. Tax Treatment: Withdrawals from the Savings Pot are added to annual remuneration and taxed at the taxpayer's SARS marginal income tax rate (applying progressive 2026/2027 PAYE brackets: 18% to 45%). General rebates do not reduce tax on pre-retirement lump sum withdrawals unless standard annual tax liability is zero. Fund Administrator handling fee: Typical flat fee of R200 - R450 + 15% VAT. SARS Tax Directive deduction: Existing tax arrears or SARS administrative penalties are automatically withheld from the gross payout. Future value compound interest retirement deficit modeled at 10% expected annual return over 10, 20, and 30 years.",
    "monetization": "AdSense Auto Ads (ca-pub-9938389941694225), Paystack projection report PDF, and FSCA CFP financial advisor lead generation.",
    "tech_stack": "vanilla HTML/Tailwind CDN/JS",
    "status": "completed"
  },
  {
    "slug": "sa-vat-calculator-and-apportionment-tool",
    "title": "SARS VAT 15% Inclusive, Exclusive & Apportionment Calculator",
    "category": "Finance",
    "description": "Fast South African VAT calculation tool supporting standard rate (15%), zero-rated supplies, exempt items, and mixed-use turnover apportionment.",
    "core_logic": "Calculates VAT inclusive, exclusive, and VAT amounts in real time. Implements Section 17(1) turnover apportionment formulas for mixed standard and exempt supplies to determine deductible input tax percentages, bad debt VAT adjustments, and generates a formatted VAT201 reconciliation summary.",
    "monetization": "AdSense Auto Ads (ca-pub-9938389941694225) and accounting software affiliate links.",
    "tech_stack": "vanilla HTML/Tailwind CDN/JS",
    "status": "completed"
  },
  {
    "slug": "sars-paye-uif-salary-calculator",
    "title": "South African PAYE & UIF Net Salary Calculator (2026/2027 Tax Year)",
    "category": "Finance",
    "description": "Computes statutory 2026/2027 progressive SARS tax brackets (18% - 45%), Section 11F retirement deductions, Section 6A medical tax credits, and statutory UIF contributions with reactive visual split charts.",
    "core_logic": "SARS 2026/2027 statutory income tax brackets: 18% (R0 - R246,000); R44,280 + 26% (R246,001 - R384,200); R80,212 + 31% (R384,201 - R531,500); R125,875 + 36% (R531,501 - R694,400); R184,519 + 39% (R694,401 - R891,900); R261,544 + 41% (R891,901 - R1,911,200); R679,457 + 45% (above R1,911,200). Annual tax rebates: Primary (<65) R17,820 (entry threshold R99,000), Secondary (65-74) R9,765 (threshold R153,250), Tertiary (75+) R3,258 (threshold R171,350). Section 6A Medical Scheme Fees Tax Credit: R364/month for main member, R364/month for first dependent, R246/month per additional dependent. Section 11F Retirement Annuity / Pension deductions capped at the lesser of R350,000 or 27.5% of remuneration. UIF: 1% employee contribution capped at R177.12/month (on monthly remuneration ceiling of R17,712), matched by 1% employer contribution (R177.12 maximum).",
    "monetization": "AdSense Auto Ads (ca-pub-9938389941694225), Paystack PDF payslip export, and registered tax practitioner referrals.",
    "tech_stack": "vanilla HTML/Tailwind CDN/JS",
    "status": "completed"
  },
  {
    "slug": "solar-inverter-and-battery-backup-sizing-calculator",
    "title": "Home Solar Inverter, Battery & Load-Shedding Sizing Calculator",
    "category": "Utility",
    "description": "Determines exact inverter capacity (kVA/kW) and lithium battery storage (kWh) required to run home and office appliances during power outages.",
    "core_logic": "Provides an appliance checklist with standard operating wattages and inductive surge multipliers. Computes total continuous power, peak startup surge wattage, minimum inverter rating with a 20% safety margin, and total required lithium battery capacity (Ah/kWh) factoring in chosen backup hours and 80-90% battery Depth of Discharge (DoD).",
    "monetization": "AdSense Auto Ads (ca-pub-9938389941694225) and solar equipment supplier referral links.",
    "tech_stack": "vanilla HTML/Tailwind CDN/JS",
    "status": "completed"
  },
  {
    "slug": "svg-path-optimizer-and-visualizer",
    "title": "SVG Path Visualizer, Cleaner & Code Minifier",
    "category": "DevTools",
    "description": "Visual SVG inspector and minifier that optimizes vector paths, strips editor bloat, previews coordinates, and exports to clean SVG, JSX, or CSS data URIs.",
    "core_logic": "Parses raw SVG strings or uploaded files, removes unnecessary namespaces, metadata, and comments, rounds floating-point coordinate precision, and transforms path commands into simplified shorthand. Displays side-by-side visual path rendering, original vs minified file size savings, and one-click export to React/Vue JSX or CSS background URLs.",
    "monetization": "AdSense Auto Ads (ca-pub-9938389941694225) and developer tooling sponsorships.",
    "tech_stack": "vanilla HTML/Tailwind CDN/JS",
    "status": "completed"
  }
]