Comparison

Ohm vs Radiator Calculator Pro

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

Head to head
About

Ohm

Features
Read full description

In a world driven by technology, precision is paramount. Whether you're an engineer, hobbyist, or simply someone curious about the dynamics of electrical wire coils, Ohm-Y is your comprehensive guide. This app has been meticulously designed to provide instant, accurate calculations related to resistance, wattage, amperage, and the heat coefficient of any electrical wire coil. Join us on a deep dive into what makes Ohm-Y the must-have app for anyone dealing with electrical circuits. Precision Calculations: Using advanced algorithms and a rich database of material properties, Ohm-Y ensures that you get the most accurate readings on the parameters of your coil. Say goodbye to the guesswork and hello to precision. Intuitive User Interface: We believe that powerful tools should be easy to use. Our minimalist design approach ensures that even if you're not familiar with electrical terminologies, you'll find the app approachable and straightforward. Heat Coefficient Insights: The heart of any coil is its ability to manage heat. Our app doesn’t just give you numbers; it offers insights. With Ohm-Y, you can predict potential overheating scenarios and take proactive measures. Diverse Materials Database: From copper to titanium, our extensive material database covers a broad spectrum. Whether you're working on a DIY project or a large-scale industrial application, Ohm-Y has got you covered.

About

Radiator Calculator Pro

Accurately calculate the heating requirements for any room in your home. This tool supports unlimited rooms, offers precise calculations in Watts and BTU, and features a clean, intuitive design with dark mode support.

Highlights
  • Calculate heating requirements
  • Support for all room types
  • Precise Watts and BTU output
  • Unlimited room saving
  • Intuitive user interface
  • Dark mode support
Features
Read full description

Room-by-room radiator sizing. Watts and BTU/h output for any room, factoring volume, glazing, external walls, roof and floor exposure, and insulation standard. Calculation Heat output per room with adjustments for: β€’ Room type (8 presets: bedroom, living room, bathroom, kitchen, hallway, office, conservatory, garage) β€’ Internal volume β€’ Window-to-floor ratio β€’ Number of external walls (0–4) β€’ What's above (loft, pitched roof, flat roof, heated space) β€’ What's below (garage, unheated cellar, uninsulated floor, heated floor) β€’ Insulation level: poor (older single-glazed) β†’ average (modern build) β†’ good β†’ excellent (new-build, triple-glazed) β€’ Mean water temperature - Ξ”T30, Ξ”T35, Ξ”T40, Ξ”T50, Ξ”T60 Ξ”T correction uses the standard panel-radiator exponent (n = 1.30) per EN 442 testing convention. A 5% safety margin is applied to avoid undersizing. Heat-pump systems Select Ξ”T35 or Ξ”T30 to spec radiators for low-temperature systems. Output is rescaled β€” a 1000W Ξ”T50-rated radiator delivers ~630W at Ξ”T35 β€” so you size to actual delivered heat, not nameplate. Output β€’ Watts and BTU/h side-by-side β€’ Metric or imperial dimensions β€’ Whole-home heat-loss total β€’ Share or export room specs as text For plumbers, heating engineers, and heat-pump installers sizing radiator schedules, and homeowners or landlords running their own jobs.

Screenshots

Ohm4 screens
Radiator Calculator Pro4 screens

Verdict

The call

The clearest difference is price: Radiator Calculator Pro at Free against Ohm's $2.99. Ohm's advantage is in-app purchases (none vs 1) and update cadence (every 3 weeks vs every 3 months). On ads and device support there is nothing between them.

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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Radiator Calculator Pro is free to download; Ohm costs $2.99 up front. Radiator Calculator Pro sells 1 one-off in-app purchase. Ohm asks for nothing beyond the download.

UpkeepUpdate frequency

Ohm ships an update every 3 weeks, Radiator Calculator Pro every 3 months. The most recent releases landed on October 25, 2026 and October 28, 2026 respectively.

Scorecard4 real differences Β· 4 level
Ohm versus Radiator Calculator Pro: the parameters behind the verdict, then further details
ParameterOhmRadiator Calculator Pro
Price$2.99Free β€” better
Positive reviewsβ€”0.0% of reviews
Update frequencyEvery 3 weeks β€” betterEvery 3 months
AdsNoNo
In-app purchasesNo β€” betterYes
Monetizationβ€”Paid
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.0 β€” better26.0
Further details β€” not scored
Size6 MB16 MB
Age rating4+4+
DeveloperEric WeilDigitalKind Ltd

In-app purchases

None

Ohm

No in-app purchases

1 purchases

Radiator Calculator Pro

One-time1
  • Radiator Calculator PRO$3.99

Questions

Is Ohm free?
Ohm costs $2.99, with no in-app purchases.
Is Radiator Calculator Pro free?
Radiator Calculator Pro is free to download, with in-app purchases available.
Do Ohm or Radiator Calculator Pro have ads?
Neither Ohm nor Radiator Calculator Pro shows ads.
Which is updated more often, Ohm or Radiator Calculator Pro?
Ohm ships an update every 3 weeks, and Radiator Calculator Pro every 3 months. Most recently, Ohm was updated on October 25, 2026 and Radiator Calculator Pro on October 28, 2026.

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