# DieselCalcs — Pour some gas on your FIRE > Free, privacy-focused financial calculators for achieving financial independence. (iPhone/iPad app by Drew Sullivan.) - Source: https://appshunter.io/ios/app/dieselcalcs/id6753960100 (this page in markdown: same URL + `.md`) - Developer: [Drew Sullivan](https://appshunter.io/developer/1845947341) - Category: Finance, Productivity - Price: Free with in-app purchases - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 18.4 · 6 MB - Released: 2025-10-23 - Data updated: 2026-07-17 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/dieselcalcs/id6753960100/reviews.md ## What is DieselCalcs? DieselCalcs: Financial calculators built for people serious about reaching FIRE (Financial Independence, Retire Early). 100% FREE. NO ADS. NO TRACKING. NO BS. Powerful, easy-to-use, privacy-first calculators that help you take control of your financial future—without costing you a dime. ————————————————————— CALCULATORS TO ACCELERATE YOUR FIRE JOURNEY FIRE Calculator Calculate your Traditional FIRE number, Coast FI target, and Monte Carlo success probability all in one view. See exactly how much you need to retire and your probability of success. • Traditional FIRE: Your full retirement number based on annual expenses and withdrawal rate • Coast FI: How much you need today to coast to retirement without additional savings • Monte Carlo Success: Your probability of reaching your FIRE goal accounting for market volatility Buy vs Rent Calculator - NEW! Finally answer the question: should you buy or rent? Get a clear recommendation based on comprehensive analysis of total costs, opportunity costs, investment returns, mortgage details, and insurance over your timeline. • Total cost comparison over your stay duration • Opportunity cost of down payment invested • Mortgage interest and principal breakdown • Property taxes, HOA fees, and insurance • Clear "buy" vs "rent" recommendation Compound Interest Calculator Master the math of wealth building with three powerful calculation modes: • Future Value: See how your money grows with regular contributions • Required Contribution: Calculate the monthly amount needed to reach your goal • Years to Goal: Find out how long it takes to hit your target with your current savings rate Car Payment Calculator - NEW! Calculate monthly car payments with comprehensive breakdowns. See total interest paid and optimize your loan terms before signing. • Monthly payment calculations • Total interest and cost over loan life • Principal vs interest breakdown • Compare different loan terms and rates Inflation Calculator Adjust dollar amounts for inflation using real CPI data (1913-2024). Understand what your money will be worth in the future, or what past dollars are worth today. Projects 3% annual inflation for future years to help you plan ahead. ————————————————————— BUILT FOR YOU Completely Free Every calculator. Every feature. Zero cost. Built for people who are serious about their money and don't want to waste it on yet another subscription or expensive app. Privacy First All calculations happen on your device. We don't collect, store, or transmit any of your data. Ever. Beautiful UX Smooth sliders with haptic feedback and an industrial design that feels premium. Results stay visible while you scroll—no more hunting for numbers. Mobile-Optimized Built specifically for iPhone with perfect touch targets, intuitive controls, and state persistence that remembers where you left off. Support Development (Optional) If you find the app valuable, optional "Buy Me a Matcha" tips are available. But the app is 100% functional without tipping—no guilt, no pressure, no locked features. ————————————————————— PERFECT FOR • FIRE community members tracking their journey to financial independence • Anyone deciding between buying vs renting • Home buyers calculating mortgage payments and total costs • Car buyers comparing loan options • Investors who want to understand compound growth • People planning for inflation and future purchasing power • Anyone who's tired of expensive financial apps with subscriptions ————————————————————— YOUR DATA STAYS YOURS Zero data collection. Zero third-party tracking. Just calculators that work, respect your privacy, and help you reach financial independence faster. And now, completely free. ————————————————————— Built by a developer in the FIRE community, for the FIRE community. ## Key features - FIRE Calculator (Traditional, Coast FI, Monte Carlo) - Buy vs Rent analysis - Compound Interest calculator modes - Car Payment calculator - Inflation adjustment calculator - Privacy-first, on-device calculations - Ad-free and free to use ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Small Matcha | $0.99 | one-time | | Large Matcha | $4.99 | one-time | | Medium Matcha | $2.99 | one-time | ## Frequently asked questions about DieselCalcs ### What is DieselCalcs? DieselCalcs is a free, privacy-focused financial calculator app designed to help users plan for financial independence and early retirement. It offers a variety of tools to analyze savings, investments, and major financial decisions. ### Is DieselCalcs free to use? Yes, DieselCalcs is 100% free to use with no ads or tracking. The developer offers optional 'Buy Me a Matcha' tips for users who find the app valuable. ### How secure is DieselCalcs? DieselCalcs prioritizes user privacy by performing all calculations directly on your device. Your financial data is never collected, stored, or transmitted by the app. ### What financial calculators are included in DieselCalcs? DieselCalcs includes a FIRE calculator (Traditional, Coast FI, Monte Carlo), a Buy vs Rent calculator, a Compound Interest calculator, a Car Payment calculator, and an Inflation calculator. ### On what devices can I use DieselCalcs? DieselCalcs is built specifically for iPhone and iPad, offering a mobile-optimized user experience with intuitive controls and state persistence. ### How often is DieselCalcs updated? The latest version of DieselCalcs is 4, and it was last updated on February 22, 2026. This indicates a commitment to ongoing development and improvements. ### What is the user sentiment for DieselCalcs? Based on the available data, DieselCalcs has a perfect rating of 5.0 stars from 1 rating, suggesting very positive initial user feedback. ### Does DieselCalcs have ads? No, DieselCalcs is completely ad-free. The app explicitly states 'NO ADS' and focuses on providing a clean, uninterrupted user experience. ## Version history (last 3 releases) ### 4 — 2026-02-22 Bug fixes and lots of new features! ### 3.0 — 2025-11-04 NOW 100% FREE DieselCalcs is now completely free! No purchase required, no subscriptions, no paywalls. Every calculator, every feature—yours at no cost. Optional tips available if you want to support development, but the app is fully functional without spending a penny. NEW CALCULATORS Buy vs Rent Calculator Finally answer the age-old question: should you buy or rent? See total costs over your timeline, including opportunity costs, investment returns, mortgage interest, and insurance. Get a clear recommendation based on your numbers. Car Payment Calculator Calculate monthly car payments with comprehensive breakdowns showing principal, interest, and total cost. Optimize your auto loan before signing. MAJOR UX IMPROVEMENTS Sticky Results Results now stay visible at the top while you adjust sliders below. No more scrolling back and forth to see how changes affect your numbers. State Persistence Your inputs are now saved automatically. Close the app, come back later—everything's exactly where you left it. Precise Rate Adjustments Mortgage and loan rates now step in 0.125% increments (6.125%, 6.25%, etc.) for accurate calculations that match real-world offers. QUALITY IMPROVEMENTS • More natural, conversational result descriptions • Smoother slider performance with intelligent debouncing • Cleaner breakdown displays with inline formulas • More consistent design throughout ### 1.0 — 2025-10-23 No release notes. ## Apps similar to DieselCalcs | App | Rating | Price | Category | | --- | --- | --- | --- | | [Inflation Calculator - Calc](https://appshunter.io/ios/app/inflation-calculator-calc/id1578068839) | 4.3 (52) | Free | Finance | | [Frec: Direct indexing](https://appshunter.io/ios/app/frec-direct-indexing/id6505110202) | 4.9 (37) | Free | Finance | | [Upromise: Cash Back Rewards](https://appshunter.io/ios/app/upromise-cash-back-rewards/id1569423262) | 4.3 (536) | Free | Finance | | [TRI-AD Benefits on the Go](https://appshunter.io/ios/app/tri-ad-benefits-on-the-go/id1234241623) | 4.5 (800) | Free | Finance | | [Inflation Calculator & Data](https://appshunter.io/ios/app/inflation-calculator-and-data/id1502023144) | 4.5 (919) | Free | Finance | | [Mezzi Wealth](https://appshunter.io/ios/app/mezzi-wealth/id6449714926) | 4.7 (103) | Free | Finance | --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-17.*