Comparison

Builder's Formulator vs Inventory Easy

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Builder's Formulator

This comprehensive tool provides over 2,600 formulas, code charts, and technical drawings for construction professionals. It covers calculations for structural engineering, electrical, plumbing, HVAC, and financial aspects of building projects. Includes unit conversions and ADA accessibility references.

Highlights
  • Over 2,600 formulas
  • Plumbing code charts
  • Technical drawings
  • ADA accessibility references
  • Unit conversions
  • Save and revisit calculations
  • Mark favorites
Features
Read full description

Builder's Formulator is the ultimate professional reference tool for general contractors, builders, plumbers, HVAC technicians, and electricians. With over 2,600 formulas, 136 plumbing code charts, 27 technical drawings, and complete ADA accessibility references, it's the most comprehensive construction calculator available. CONSTRUCTION — Calculate joists, studs, headers, hardwood flooring costs, concrete and excavation volumes, bricks needed for a wall, roofing materials, stair dimensions, lumber requirements, and acoustic absorption. Includes material weight references for dozens of building materials. STRUCTURAL ENGINEERING — Comprehensive beam analysis for single-span and cantilevered beams with point loads, uniform loads, and triangular loads. Concrete design for flexure, shear, axial compression, and prestressed concrete. Masonry stress analysis, steel design, wood design, flat plate calculations, soil bearing capacity, and road/highway formulas. ELECTRICAL — Calculate kilowatts, horsepower, efficiency, power factor, watts, amps, resistance, and voltage. Includes transformer calculations, voltage drop analysis, motor sizing, battery calculations, AC/DC circuits, Ohm's Law, impedance, frequency conversions, and UPS sizing. PLUMBING & HVAC — Pipe sizing, flow velocity, friction loss, pressure calculations, drainage and venting, storm drainage, gas piping, water heater sizing and recovery, pump horsepower, septic and sewage systems, grease interceptors, thermal expansion, water supply sizing, medical gas piping, and swimming pool calculations. Boiler efficiency, condensation, and comprehensive water flow analysis. HVAC SYSTEMS — Dedicated ductwork and duct sizing, fan laws, pump laws, gas laws, hydronic formulas, psychrometrics, ventilation rates, heating design, refrigeration, steam systems, air change rate equations, humidity calculations, and heating/cooling load analysis. FINANCIAL — Mortgage calculations, depreciation, investment analysis, interest formulas, debt ratios, and price quotes. REFERENCE LIBRARY — 136 plumbing code charts and tables covering gas piping, drainage, venting, backflow prevention, medical gas, thermal expansion, fixture units, and more. 27 technical drawings for venting systems, chimney terminations, gas clearances, and water heater installations. Complete ADA accessibility reference with 52 diagrams and 17 documents covering wheelchair dimensions, grab bars, ramps, parking, elevators, and restroom clearances. Plus built-in reference tables for occupancy loads, brick sizes, lumber dimensions, wire gauge, concrete mixes, and insulation R-values. CONVERSIONS — Hundreds of unit conversions across pressure, volume, linear measure, area, weight, flow, power, BTU, and eight temperature scales including Celsius, Fahrenheit, Kelvin, and Rankine. FEATURES — Save and revisit calculations, mark favorites for quick access, toggle between US and metric units, export and share results, and view your complete calculation history. Dark mode interface designed for jobsite readability. Builder's Formulator — one app for every trade on the job.

About

Inventory Easy

Organize your stock with a powerful barcode and QR code scanner. Track items, view pricing, and manage inventory across devices. Ideal for businesses and personal use, it offers customizable fields and low stock alerts.

Highlights
  • Barcode and QR code scanning
  • Cloud sync across devices
  • Customizable fields
  • Low stock alerts
  • Team access and real-time updates
  • Visual inventory browsing
Features
Read full description

**Team Inventory– Smart Inventory Management Made Simple** Team Inventory is the fastest and easiest way to organise your inventory using a powerful barcode and QR code scanner. Keep your stock in check and accessible anytime, from anywhere. Quickly scan items to view stock and pricing details on the spot. Designed for business owners and personal use, Inventory Easy is highly customisable and incredibly easy to use. It’s a simple yet powerful inventory tracking solution that helps you and your team know exactly what you have, where it is, and who has it—on any device, at any time. Unlike traditional inventory systems, Inventory Easy doesn’t require long training sessions or thick user manuals. It’s built to work right out of the box. Access Inventory Anywhere * Use the app on Mac, iPhone, or iPad * Access inventory on the go, even across multiple devices * Your data syncs automatically via the cloud A Simple and Visual System * Browse inventory with photos instead of just item names * Organise stock using colourful folders Scan Barcodes and QR Codes * Link barcodes and QR codes to items for quick access * Generate and print your own barcodes and QR codes * Use them to search, update, or relocate items with ease Customisable Fields * Add custom fields to suit your specific business needs Get Stock Alerts * Set up alerts to monitor low stock levels * Stay updated on recent changes * Avoid running out of essential items Give Your Team Access * Share access across multiple users and devices * Keep your entire team aligned with real-time updates Inventory Management * Maintain item details and stock levels with ease * Add items manually or via barcode scan * Supports multiple currencies Upgrade to Subscription Version The subscription version includes secure cloud storage and syncing across all your iOS devices like iPhone and iPad. Subscription details: * Payment is charged to your Apple ID at the time of purchase * Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period * Your account will be charged within 24 hours prior to renewal * Manage or cancel your subscription through your App Store account settings Links to Your Privacy Policy and Terms of Use: http://www.btoj.com.au/privacy.html http://www.btoj.com.au/terms.html Have questions or need help? Please feel free to contact us anytime.

Screenshots

Builder's Formulator4 screens
Inventory Easy4 screens

Verdict

The call

The clearest difference is review sentiment: Inventory Easy at 50% against Builder's Formulator's 0%. Inventory Easy also leads on rating (4.7 vs 2.0) and update cadence (fortnightly vs every 2 months). Builder's Formulator's advantage is monetization model (free vs free with in-app purchases). On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Builder's Formulator sells 1 one-off in-app purchase and Inventory Easy sells 2 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Inventory Easy holds the better App Store score, 4.7 against 2.0. That said, the two scores are not equally well evidenced: Inventory Easy has 82 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 0% of Builder's Formulator's written reviews are positive against 50% of Inventory Easy's.

UpkeepUpdate frequency

Builder's Formulator ships an update every 2 months, Inventory Easy fortnightly. The most recent releases landed on October 27, 2026 and October 30, 2026 respectively.

Scorecard6 real differences · 4 level
Builder's Formulator versus Inventory Easy: the parameters behind the verdict, then further details
ParameterBuilder's FormulatorInventory Easy
PriceFreeFree
Rating2.0 (3 ratings)4.7 (82 ratings) — better
Positive reviews0.0% of reviews50.0% of reviews — better
Number of ratings382 — better
Update frequencyEvery 2 monthsFortnightly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS26.415.0 — better
Further details — not scored
Size48 MB60 MB
Age rating4+4+
DeveloperHistorycentral.comB TO J PTY LTD

Customer experience

Builder's Formulator

All ratings3 ratings
Positive33.3%
Neutral0.0%
Negative66.7%
Written reviews6 reviews
Positive0.0%
Neutral33.3%
Negative66.7%

Inventory Easy

All ratings79 ratings
Positive92.4%
Neutral2.5%
Negative5.1%
Written reviews6 reviews
Positive50.0%
Neutral16.7%
Negative33.3%

In-app purchases

1 purchases

Builder's Formulator

One-time1
  • Builder Pro$2.99
2 purchases

Inventory Easy

Subscriptions2
  • 1 Month Subscription$7.991 Month
  • 1 Year Subscription$59.991 Year

Questions

Is Builder's Formulator free?
Builder's Formulator is free to download, with in-app purchases available.
Is Inventory Easy free?
Inventory Easy is free to download, with in-app purchases available.
Which has better reviews, Builder's Formulator or Inventory Easy?
Inventory Easy is rated higher. Builder's Formulator averages 2.0 out of 5 from 3 ratings, while Inventory Easy averages 4.7 from 82 ratings.
Do Builder's Formulator or Inventory Easy have ads?
Neither Builder's Formulator nor Inventory Easy shows ads.
Which is updated more often, Builder's Formulator or Inventory Easy?
Builder's Formulator ships an update every 2 months, and Inventory Easy fortnightly. Most recently, Builder's Formulator was updated on October 27, 2026 and Inventory Easy on October 30, 2026.

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