# LotofTools — Free Online Tools for Founders, Developers & Creators
> https://lotoftools.org

LotofTools provides 1000+ free, browser-based micro-tools for SaaS founders, developers, marketers, and creators. Every tool runs 100% client-side — no signup, no data collection.

## SaaS Tools
> https://lotoftools.org/saas-tools/

- [Burn Rate & Runway Calculator](https://lotoftools.org/saas-tools/burn-rate-calculator/): Calculate monthly cash burn rate, net burn, gross burn, and startup runway in months. 12-month animated forecast chart.
- [MRR Growth Projector](https://lotoftools.org/saas-tools/mrr-growth-projector/): Project 12-month Monthly Recurring Revenue with churn modeling, new MRR, and expansion MRR. Milestone markers.
- [LTV:CAC Ratio Visualizer](https://lotoftools.org/saas-tools/ltv-cac-ratio-calculator/): Animated gauge for Customer Lifetime Value to Customer Acquisition Cost ratio. Payback period and unit economics health score.
- [Equity Vesting Visualizer](https://lotoftools.org/saas-tools/equity-vesting-calculator/): Visualize 4-year equity vesting schedule with 1-year cliff, departure scenarios, and share value calculator.
- [VC Dilution Calculator](https://lotoftools.org/saas-tools/vc-dilution-calculator/): Model cap table dilution across multiple funding rounds. MOIC calculator, exit waterfall, and option pool shuffle.
- [K-Factor Virality Calculator](https://lotoftools.org/saas-tools/k-factor-virality-calculator/): Calculate viral K-factor growth loop with flywheel animation, benchmark bars, and cycle-by-cycle projections.
- [Pricing A/B Test Estimator](https://lotoftools.org/saas-tools/pricing-ab-test-calculator/): Bayesian and frequentist significance testing for pricing experiments. Revenue impact and sample size calculator.
- [Churn & NRR Calculator](https://lotoftools.org/saas-tools/churn-nrr-calculator/): Calculate customer churn rate, revenue churn, Net Revenue Retention, and Gross Revenue Retention with leaky bucket visualization.
- [Rule of 40 Calculator](https://lotoftools.org/saas-tools/rule-of-40-calculator/): SaaS Rule of 40 score (growth rate + profit margin). Scatter chart with 15+ public company benchmarks and valuation range.
- [Cohort Retention Heatmap](https://lotoftools.org/saas-tools/cohort-retention-heatmap/): Color-coded cohort retention heatmap with Sticky Score, LTV reality check, and curve pattern diagnosis.
- [ARR Bridge Calculator](https://lotoftools.org/saas-tools/arr-bridge-calculator/): Quarterly ARR waterfall with new ARR, expansion, contraction, churn. Magic Number, Burn Multiple, and board-deck export.
- [Grade My SaaS](https://lotoftools.org/saas-tools/grade-my-saas/): Instant A-F grade for SaaS metrics. Stage-aware benchmarks, radar chart, improvement simulator, and investor readiness badge.

## Marketing Tools
> https://lotoftools.org/marketing-tools/

- [ROAS & Scale Calculator](https://lotoftools.org/marketing-tools/roas-calculator/): Calculate Return on Ad Spend per channel, get letter grades, optimize budget allocation, and project scale.
- [Email Marketing Revenue Calculator](https://lotoftools.org/marketing-tools/email-marketing-revenue-calculator/): Calculate email list value, ROI per dollar, and revenue funnel. 6-dimension report card with industry benchmarks.
- [Marketing Attribution Calculator](https://lotoftools.org/marketing-tools/marketing-attribution-calculator/): Compare 6 attribution models (First Touch, Last Touch, Linear, Time Decay, U-Shaped, W-Shaped) side-by-side.
- [SEO Traffic & Revenue Forecaster](https://lotoftools.org/marketing-tools/seo-traffic-forecaster/): Project organic traffic and revenue from keyword rankings. Portfolio report card, payback calculator, what-if optimizer.
- [Content Marketing ROI Calculator](https://lotoftools.org/marketing-tools/content-roi-calculator/): Calculate content library value, content vs paid crossover point, and 6-dimension report card.
- [Marketing Budget Allocator](https://lotoftools.org/marketing-tools/marketing-budget-allocator/): Optimize marketing budget across channels with portfolio grading, diminishing returns modeling, and reallocation optimizer.
- [Lead Funnel Velocity Calculator](https://lotoftools.org/marketing-tools/lead-funnel-velocity-calculator/): Map sales funnel stages, find #1 revenue bottleneck, and simulate fixes. Funnel health grade (A-F).
- [Social Media Growth & Earnings Calculator](https://lotoftools.org/marketing-tools/social-media-growth-calculator/): Account value, monthly earnings, creator tier progress, and growth projections across Instagram, TikTok, LinkedIn, YouTube.
- [A/B Test Calculator](https://lotoftools.org/marketing-tools/ab-test-calculator/): Bayesian and frequentist significance, revenue impact hero, 6-dimension report card, multi-variant (A/B/C/D) support.

## About
LotofTools is free forever. All tools run entirely in your browser using JavaScript. No data is sent to any server. No signup required. Built by founders, for founders.