File, document and everyday web utilities
Pricing and cost calculators
Calculators and comparison tools that work out prices, costs, and conversions, such as product pricing for small sellers, service quote estimates, currency and fuel price conversion, cost-of-living comparisons, and trade and tax costs, for consumers and small businesses.
Built for: Small business owners, sellers, and cost-conscious consumers
Projects since May 04
132
Different builders
130
Last 4 weeks vs 8 before
+14%
AI is the core
3.8%
Projects per week
Mostly web app (61%), mobile app (16%), browser extension (9.8%) · from r/SideProject, r/SaaS, r/chrome_extensions, r/vibecoding
Latest
- AffordWhere — Estimates what a salary leaves after tax, rent and everyday expenses in a chosen city, with a monthly breakdown.“Been building AffordWhere for a year. It’s finally earning a little.”
- Qompare — Extracts and compares supplier quote PDFs on prices, delivery times, payment terms and minimum order quantities, and drafts clarification questions for suppliers.“I built a desktop app to compare supplier quotes”
- SkuWatch — Searches products and HTS codes, separates base duties from extra tariff measures, and links to source data.“I made a tariff lookup after our supplier described a product as ‘metal accessory’”
- plugorpump — Lists nearby UK petrol and diesel stations cheapest first using government fuel price data, with a map, savings estimate and directions links.“I got fed up driving past a petrol station that was 8p cheaper, so I built a free price finder using the new government fuel data”
- Sticker Shock — Charts how prices of everyday items and events have changed over time, compared city by city, with embeddable charts and cited sources.“Sticker Shock: Inflation Tracker for Everyday Prices by City”
- FuelGlance — Shows which of a user's saved petrol stations currently has the best reported price for their preferred fuel, and lists nearby stations.“FuelGlance - UK fuel price app focused on your most used stations”
- TradeScope — Searches UN trade data to show suppliers, prices, and shipment trends for products across countries.“Built a free trade data tool for importers and exporters worldwide, would love feedback”
- Asia Exchange — Converts large Southeast Asian currency amounts to and from EUR on iPhone and Apple Watch.“I made a free currency converter for Southeast Asia travel”
- FairPrice — Gives a price sense-check for a service quote and suggests questions to ask about what it includes.“I built a free tool for the “is this quote actually fair?” moment”
- MilitarySpend — Tracks military spending and war costs on a website.“Ad networks won't take my data site, so I'm trying to sell sponsor slots by myself”
- fixmyfx — Estimates how much currency conversion fees cost on income and spending and explains how to reduce them.“How you can save 2-3% of revenue on FX fees (the story behind my first product)”
- WanderBudget — Estimates total trip cost from a destination and dates by combining flights, hotels, car rentals and other expenses.“Built a free travel budget planner — looking for feedback”
- GridLoadCalc — Calculates home electrical panel load for EV chargers, plug-in balcony solar yield and payback, and battery time-of-use arbitrage savings.“I built GridLoadCalc — an open engineering calculator for home EV charger loads, plug-in solar & battery arbitrage (NEC 220.83 & UL 3700)”
- SMKlog — Estimates package dimensions and weight from an item description or product link and shows USPS, UPS, and FedEx shipping rates.“I built a shipping calculator that starts with the item, not a box — can you test it?”
- LimpioKit — Lets visitors estimate cleaning costs from selected options and sends a prepared WhatsApp quote inquiry to the business.“I built a one-file quote calculator for Spanish cleaning businesses”
- Bakery cost calculator — Calculates ingredient-based cost per batch and per portion for baked goods recipes in a spreadsheet.“I made a free Excel cost calculator for bakeries, cafes, and pastry chefs — looking for feedback”
- Batchable — Calculates suggested selling prices and profit breakdowns for handmade products by including materials, labor, and marketplace fees.“[Web] Batchable – A batch pricing & profit calculator for makers, bakers, and Etsy sellers (no signup needed)”
- xchange — Converts a selected price on a webpage to the user's currency and shows the result beside the selection.“My latest side project: highlight a foreign price and see it in your currency”
- Compares several demand forecasting methods in Excel by measuring forecast error and feeds the chosen forecast into safety stock and inventory calculations.“Title: I built an Excel demand forecasting toolkit — here’s what I learned comparing forecasting methods”
- looop-price-warehouse — Scrapes an electricity provider's API and stores its half-hourly price history in a data warehouse.“Built a data warehouse to start storing historical price from my electrical provider”
Most discussed
- Matey — Helps trade businesses such as electricians create and manage quotes, based on the domain name and the post's references.“Which Logo is the best? "I can't decide"”
- Combines freight, tariff, trade flow, and FX data with a company's costs, inventory, and procurement constraints to support import and export decisions.“Way too early in the market that my only competitor is excel.”
- Unit price calculator — Calculates the price per unit of a product from its price and size entered in any unit.“I made a price per unit calculator”
- BiteSpend — Scans grocery and restaurant receipts with an LLM, normalizes item names, and compares prices across stores for the items a user buys.“After getting tired of guessing where my grocery money went, I built an app that scans receipts and tells me what's cheaper elsewhere — beta open on Android + iOS”
- Free Project Cost Estimator — Asks seven questions about a software project and returns an instant USD cost range with a 20% buffer.“[Launch] Free Project Cost Estimator — built after one too many "just give me a number" conversations”
- AutoAudit — Estimates monthly and annual labour cost of manual steps in ecommerce order processing from order volume, steps per order, and hourly rate.“AutoAudit — free calculator to find hidden manual process costs in ecom stores”
- Calculates a profitable price for a project from entered costs, working time and expenses, and generates client quotes.“am i solving a real problem or am i building something nobody needs?”
- Life Power — Converts a user's income and city into a Life Power rank based on how far that income goes in the city's cost of living.“I vibe-coded a tool that turns your salary + city into an RPG level — Beggar to King”
- quotecop — Compares contractor quotes to show which option is fair, audits a single quote for inflated items, and generates a negotiation script.“So, I built an app that nobody cares about…Need help validating my idea”
- Mizan Health — Searches hospital price transparency files so people can compare nearby hospitals' cash and negotiated prices for a procedure.“I got tired of not knowing what an MRI would cost, so I started building a hospital price comparison tool”