Every ToolStack tool is embeddable. Your readers get a fully working calculator or utility — you get a backlink and happy visitors. No API key, no subscription, no watermark.
Monthly payment, amortisation schedule, PMI. High CPM for finance bloggers covering home buying.
Watch money grow over time with configurable compounding. Perfect for investing and savings content.
Nest egg projections with inflation adjustment. Essential for retirement planning articles.
True cost comparison with break-even analysis. Perfect for real estate and housing content.
Calculate your minimum rate from income goals. Perfect for freelance and self-employment guides.
Gross margin, net margin, markup. Essential for pricing and business profitability articles.
Add, remove, and reverse VAT at any rate. Useful for UK/EU business and accounting content.
Personalised protein, carbs, fat targets. Pairs perfectly with nutrition and diet articles.
Pace, finish time, and race splits. Must-have for running blogs and training plan articles.
Box breathing, 4-7-8, coherence patterns with animated guide. Great for anxiety and mindfulness content.
Distraction-free timer with bells and streak tracking. Perfect for mindfulness and meditation blogs.
20-question burnout quiz across 6 dimensions. Excellent for HR, wellbeing, and workplace content.
Combine PDFs in-browser. Files never uploaded. Great for productivity and document workflow content.
Format, validate, and minify JSON with error highlighting. Essential on developer resource sites.
HEX, RGB, HSL conversion with palette generation. Perfect for design and dev tool roundups.
Percentages, percentage change, reverse percentage. Useful alongside any numerical content.
25-min focus sessions with task list and sound alerts. Popular on productivity and study blogs.
Weighted grades and minimum final exam score needed. Essential for study tips and education blogs.
7-day meal planning with auto grocery list. Perfect for food, parenting, and lifestyle blogs.
Smart shopping list organised by aisle. Great for food, budgeting, and family lifestyle content.
Financial independence retirement estimate with safe withdrawal rate. Essential for personal finance and FIRE communities.
Track your savings rate vs income with FIRE timeline chart. Perfect for FIRE and personal finance blogs.
Calculate total assets minus liabilities with category breakdown. Great for wealth-building content.
Shows interest saved and years cut from overpaying a mortgage. High-value for mortgage and property blogs.
Estimate borrowing capacity with DTI analysis and lender tiers. Perfect for lending and mortgage content.
UK income tax, National Insurance, and take-home pay. High CPM for tax season and salary content.
Take-home pay after tax, NI, pension, and student loan deductions. Perfect for salary negotiation content.
Convert annual salary to hourly, daily, weekly rates. Useful for job offer comparison and freelance content.
Create and download professional invoices. Great for freelancer tools and small business content.
Convert between 30+ world currencies. Embeds well on travel, expat, and international finance sites.
Fair bill splitting among any number of people with custom amounts. Great for lifestyle and dining content.
Calories burned for 50+ activities using MET values. Great for fitness, weight loss, and sports blogs.
Calculate the deficit needed to reach goal weight. Essential for diet and nutrition content.
Predict fertile window with monthly calendar and cycle phase tracking. High-value for women's health blogs.
Pregnancy due date with trimester timeline and milestones. Essential for pregnancy and parenting blogs.
Log daily supplements from a 43-item database with streak chart. Perfect for health and wellness blogs.
Daily water intake recommendation based on weight and activity. Great for nutrition and fitness content.
Log daily mood and sleep with charts, streaks, and pattern insights. Great for wellness and mental health blogs.
Count days sober, celebrate milestones, track money saved. Perfect for addiction recovery and wellbeing sites.
White, pink, brown noise with blend mode and sleep timer. High time-on-page for sleep and wellness blogs.
Curated prompts with history, streak tracking, and export. Great for journaling and mental wellness content.
7-column cognitive behavioural therapy thought diary. Ideal for therapy resource and mental health blogs.
Daily gratitude practice with streak tracking and export. Highly embeddable on mindfulness and self-help blogs.
Visual CSS box-shadow builder with live preview and copy. Popular on CSS tutorial and web design blogs.
Live regex with replace mode, reference panel, and presets. Essential for any developer tutorial or blog.
WCAG AA/AAA checker with CVD simulation and auto fix suggestions. Must-have for accessibility and UX blogs.
Convert to camelCase, snake_case, Title Case, SCREAMING_SNAKE, and more. Useful on coding and writing blogs.
Count down to any date or duration with large visual display. Embeds well on event and goal-setting blogs.
Real-time cost of a meeting by attendee salary. High engagement on productivity and management blogs.
XYZ formula bullets with job templates and saved board. Perfect for career coaching and job search blogs.
Days between dates, add or subtract periods, day of week. Useful across any date-related content.
Exact age calculation with upcoming birthday countdown. Embeds naturally on health and lifestyle blogs.
Instant QR codes for URLs, text, and contact info. Popular on marketing, events, and tutorial blogs.
Countdown to birthdays and anniversaries with confetti. Great for relationship, family, and lifestyle blogs.
Delete specific pages from a PDF in-browser. No upload, no account. Perfect for productivity and tools content.
Rotate individual or all pages in a PDF document in-browser. Great for document workflow blogs.
Family chore tracker with assignments and completion tracking. Great for parenting and family organisation blogs.
Household budget planner with category breakdown. Perfect for family finance and parenting blogs.