Free SaaS Tools & Calculators
Calculate MRR, ARR, churn rate, LTV, affiliate commissions, Stripe fees, and more. All free, no signup required.
Affiliate
Affiliate Potential Test
See whether affiliates can understand, demonstrate, and confidently promote your product. 24 typed decisions powered by Jev.
Open tool→Affiliate Commission Calculator
Find the perfect commission rate to maximize your SaaS growth. Calculate recommended rates based on your pricing and customer metrics.
Open tool→Affiliate Marketing Calculator
Calculate affiliate marketing ROI, revenue, and commissions. Forecast program performance and optimize commission rates.
Open tool→SaaS Commission Calculator
Calculate optimal commission rates for your SaaS affiliate program with recurring, first-year, and one-time commission models.
Open tool→Tiered Commission Calculator
Calculate commissions with tiered pricing structures. Free calculator for affiliate programs with multiple commission levels.
Open tool→Referral Program Calculator
Calculate the impact and ROI of your referral program. Forecast revenue, costs, and savings from referral programs.
Open tool→Referral Program ROI Calculator
Calculate your referral program ROI and see how much you can save compared to paid advertising.
Open tool→SaaS Metrics
MRR Calculator
Calculate your Monthly Recurring Revenue and forecast growth. Includes churn analysis and expansion revenue tracking.
Open tool→ARR Calculator
Calculate your Annual Recurring Revenue and forecast growth with churn analysis and growth rate tracking.
Open tool→Churn Rate Calculator
Calculate customer churn rate and revenue churn for your SaaS business with retention analysis and LTV impact.
Open tool→LTV Calculator for SaaS
Calculate Customer Lifetime Value for your SaaS business with churn analysis, gross margin, and LTV/CAC ratio calculations.
Open tool→LTV/CAC Ratio Calculator
Calculate LTV/CAC ratio for your SaaS business. Free lifetime value to customer acquisition cost calculator with profit analysis.
Open tool→SaaS Valuation Calculator
Calculate your SaaS company valuation based on ARR, growth rate, churn, and key metrics with quality adjustments.
Open tool→SaaS Growth Calculator
Calculate SaaS growth projections and time to reach revenue goals. Free growth calculator with MRR/ARR forecasting.
Open tool→Rule of 40 SaaS Calculator
Calculate your Rule of 40 score to measure the balance between growth rate and profit margin for SaaS companies.
Open tool→Payments
Stripe Fee Calculator
Calculate Stripe payment processing fees and net revenue. Free calculator for online payments, international cards, and ACH transfers.
Open tool→Stripe vs Paddle vs Lemon Squeezy Fees
Compare what Stripe, Paddle, Lemon Squeezy, Polar and Dodo Payments charge for your price, volume and customer mix.
Open tool→Tools & Templates
Referral Link Generator
Generate referral tracking links instantly with UTM parameters, custom tracking codes, and social sharing buttons.
Open tool→Affiliate Agreement Template
Free professional affiliate program agreement template with commission terms, payment terms, and legal protections.
Open tool→Referral Email Templates
Professional referral email templates for invitations, reminders, payout notifications, and affiliate motivation.
Open tool→Referral Program Templates
Ready-to-use referral program templates for SaaS, ecommerce, marketplaces, course creators, and agencies.
Open tool→Affiliate Marketing Glossary
Comprehensive A-Z glossary of 60+ affiliate and referral marketing terms with clear definitions.
Open tool→Developer Tools
Stripe Test Cards
Every Stripe test card with copy buttons: successful, declined, 3D Secure, international and dispute cards, plus ACH test bank accounts, SEPA IBANs and test clocks.
Open tool→Lemon Squeezy Test Cards
Lemon Squeezy test mode card numbers: successful, declined and 3D Secure, with expiry and CVC rules and copy buttons.
Open tool→Paddle Sandbox Test Cards
Paddle sandbox test cards: successful, 3D Secure, declined and renewal-decline, plus sandbox URLs and rules.
Open tool→Polar Sandbox Test Cards
Polar sandbox environment and test card: URLs, tokens, the successful checkout card and CVC and expiry rules.
Open tool→Dodo Payments Test Cards
Dodo Payments test cards, UPI ids, SEPA IBANs, ACH accounts and BNPL test flows with copy buttons.
Open tool→UTM Link Builder
Build UTM-tagged URLs to track campaign performance in Google Analytics. Add source, medium, campaign, term, and content parameters.
Open tool→Test Card Numbers for Every Provider
The success card, the decline trigger and the test rules for Stripe, Paddle, Lemon Squeezy, Polar, Dodo, Braintree, Adyen, Razorpay and Mollie, side by side.
Open tool→Braintree Test Cards
Braintree sandbox test cards, the amounts that trigger declines, fake nonces, and CVV and AVS test values.
Open tool→Adyen Test Cards
Adyen test cards by brand, 3D Secure 2 cards, and the holder names that trigger each refusal reason.
Open tool→Razorpay Test Cards
Razorpay test cards for success, each error reason, international, subscription and EMI payments.
Open tool→Mollie Test Cards
Mollie test mode cards and the euro amounts that make a card payment fail with each failure reason.
Open tool→Stripe Webhook Events for SaaS
Which Stripe webhook events a subscription business should handle, what each one means, and example payloads.
Open tool→Stripe Webhook Signature Checker
Check a Stripe-Signature header against the raw body in your browser and see why verification fails.
Open tool→Ready to launch your affiliate program?
Track affiliates, automate commissions, and grow your SaaS with Refgrow.