Comparison

Plumbing Formulator vs Komunitree

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

Head to head
About

Plumbing Formulator

This professional calculator app provides over 200 formulas, calculators, and reference materials for plumbers, HVAC technicians, and mechanical contractors. It covers a wide range of calculations for water flow, piping, drainage, water heaters, pumps, and more, all in one pocket-sized tool.

Highlights
  • Over 200 formulas and calculators
  • Water flow and supply calculations
  • Pipe and piping calculations
  • Drainage and venting calculations
  • Water heater and pump calculations
  • Reference charts and code books
  • Pipe cut list optimizer
Features
Read full description

PLUMBING FORMULATOR is the ultimate professional calculator for plumbers, HVAC techs, and mechanical contractors. Over 200 formulas, reference charts, code books, and pro tools in your pocket. CALCULATORS AND FORMULAS Water Flow and Supply: pipe velocity, flow rate, GPM, fixture unit demand, and supply sizing. Pipes and Piping: area, volume, and weight for copper, steel, cast iron, and plastic. Hazen-Williams friction loss, pressure ratings, and 45 degree offsets. Drainage and Venting: drain sizing, slope and fall, vent sizing, fixture units, and wet vents. Water Heaters: BTU requirements, recovery rates, tank sizing, first hour ratings, and hot water demand. Pumps and Pressure: water and brake horsepower, efficiency, head pressure, velocity head, and PSI to feet of head. Storm Drainage: roof drains, rainfall intensity, gutter and leader sizing, and retention. Gas Piping: size natural gas and propane lines, BTU loads, pressure drop, and appliance demand. Medical Gas: size oxygen, nitrogen, nitrous oxide, and medical air. Vacuum demand and manifolds per NFPA 99. Swimming Pools: volume, fill time, pump sizing, turnover, evaporation loss, and main drains. Septic and Sewage: septic tanks, leach fields, and sewage pump capacity. Thermal Expansion: expansion tank sizing, system pressure, and pipe length changes. REFERENCE MATERIALS Charts and Tables: dozens of reference charts including pipe sizing, fixture units, and materials in PDF. Massachusetts Plumbing Code: complete 248 CMR reference with all chapters. Plumbing Design Guide: a 24 chapter design and installation guide. Technical Drawings: professional diagrams and installation details. TOOLS AND FEATURES Pipe Cut List Optimizer: enter lengths and stock sizes for an optimized cutting plan that cuts waste. Unit Conversions: length, area, volume, flow, pressure, temperature, weight, and power. Geometry Calculators: area and volume for circles, rectangles, triangles, cylinders, spheres, cones, and more. BUSINESS MANAGEMENT More than a calculator. Tap Business to run your service company from the same app. Customers: contacts, service addresses, job history, and outstanding balances. More than a calculator. Tap Business to run your service company from the same app. Customers: contacts, service addresses, job history, and outstanding balances. Quotes and Estimates: build quotes on site and turn an approved quote into an invoice with one tap. Invoicing: branded invoices with your logo, parts and labor, taxes, and terms. Send by email, print, or PDF. Payments: cash, check, card, ACH, or credit. Apply one payment across invoices and manage credit automatically. Scheduling: book service calls, track jobs, and set up recurring contracts that auto-generate invoices. Business Reports: balances, receivable aging, revenue, and payment history. Export as CSV or PDF. Business features are a separate one-time upgrade, discounted for existing Bill-Craft and ServiceBoss customers. PLUMBING PRO FEATURES Upgrade to Plumbing Pro to save calculations with full detail, export results, keep unlimited history, and remove ads. One time purchase with lifetime access. A modern dark interface built for the job site, with breakdowns showing the steps and formulas behind every result. Perfect for plumbers, apprentices, HVAC techs, mechanical engineers, and building inspectors. Download Plumbing Formulator today and put professional plumbing calculations at your fingertips.

About

Komunitree

Features
Read full description

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Screenshots

Plumbing Formulator4 screens
Komunitree4 screens

Verdict

The call

The clearest difference is in-app purchases: Komunitree at none against Plumbing Formulator's 4. Komunitree also leads on update cadence (every 4 days vs every 2 months) and iOS requirement (16.4 vs 18.6). On price, ads 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. Plumbing Formulator sells 4 one-off in-app purchases. Komunitree asks for nothing beyond the download.

UpkeepUpdate frequency

Plumbing Formulator ships an update every 2 months, Komunitree every 4 days. The most recent releases landed on September 26, 2026 and September 17, 2026 respectively.

Scorecard3 real differences · 7 level
Plumbing Formulator versus Komunitree: the parameters behind the verdict, then further details
ParameterPlumbing FormulatorKomunitree
PriceFreeFree
Rating4.6 (7 ratings) — better—
Positive reviews9.1% of reviews—
Number of ratings7 — better—
Update frequencyEvery 2 monthsEvery 4 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree—
DevicesiPhone, iPad — betteriPhone
Requires iOS18.616.4 — better
Further details — not scored
Size123 MB140 MB
Age rating4+17+
DeveloperHistorycentral.comSkunk Works OPC

In-app purchases

4 purchases

Plumbing Formulator

One-time4
  • Pro Version$1.99
  • Pro Purchase$3.99
  • Starter$5.99
Show 1 more
  • Growth$9.99
None

Komunitree

No in-app purchases

Questions

Is Plumbing Formulator free?
Plumbing Formulator is free to download, with in-app purchases available.
Is Komunitree free?
Komunitree is free to download, with no in-app purchases.
Do Plumbing Formulator or Komunitree have ads?
Neither Plumbing Formulator nor Komunitree shows ads.
Which is updated more often, Plumbing Formulator or Komunitree?
Plumbing Formulator ships an update every 2 months, and Komunitree every 4 days. Most recently, Plumbing Formulator was updated on September 26, 2026 and Komunitree on September 17, 2026.

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