Comparison

RadiatorOutput vs HyTools

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

Head to head
About

RadiatorOutput

Calculate radiator heat output based on water and air temperatures. Ensure optimal energy efficiency and cost savings by selecting the correct radiator size for any heating system, including those with low water temperatures. Supports metric units and can also calculate cooling output for convectors and fan-coils.

Highlights
  • Calculate radiator heat output
  • Adjust for water and air temperatures
  • Optimize energy efficiency
  • Supports low water temperature systems
  • Calculate cooling output
  • Metric units only
Features
Read full description

Quickly calculate a radiator's heat output at different water and air temperatures. Select the radiator that fits, based on heat losses and water temperature. Don't undersize or oversize and ensure the best energy efficiency possible.  Low water temperature (e.g. with heat pump as heat generator) can greatly increase energy efficiency and keep the cost down, but it still needs to provide enough heat to keep the room or the building warm. That's why larger radiators are needed in such cases. Find out exactly how large quickly using this app. Anywhere, anytime, fast and simple. ** Note: metric units only. *** This app is totally free - no ads, no in-app purchases. No account needed, no log-ins, no user data needed nor collected. *** A radiator's heat output is highly dependent on temperature of water entering and leaving the radiator. Nominal heat output of a radiator can be found in a catalogue or a technical brochure. The nominal heat output is valid only at the conditions specified in the catalogue. This application will calculate the heat output of the selected radiator at conditions specified by the user. This is useful for the selection of the right size of a radiator when designing a new heating system, as modern heating systems tend to use lower water temperatures than those specified in catalogues. The reason is simple: lower temperatures mean higher energy efficiency and lower cost. The application can also be used for calculating the cooling output of convectors and fan-coils at various conditions. The application is available in English, French, German and Italian languages. The application does not contain ads.

About

HyTools

This app provides HVAC professionals with a comprehensive suite of hydronic calculation tools. It assists with tasks like valve sizing, pressure drop calculations, and radiator power estimation. The tool offers unit conversion and language selection for user convenience.

Highlights
  • Hydronic calculator
  • Valve sizing and presetting
  • Radiator power estimation
  • Pipe sizing
  • Unit conversion
  • Pressure maintenance calculation
Features
Read full description

IMI Hydronic Engineering proudly presents HyTools, the user-friendly hydronic calculator App for HVAC professionals. Features include: - Hydronic calculator (enter any two values and get the third one): - flow - Kv/Cv - pressure drop - power - flow - temperature difference - flow - valve setting - pressure drop - Dirt and air separator pressure drop calculation - Valve sizing and presetting - Radiator power estimation (panel and column) - Radiator valve sizing and presetting - Pipe sizing - Unit conversion - Run-time selection of localisation - Run-time selection of language - Pressure maintenance and vacuum degassing calculation and selection for heating, cooling and solar systems Stay tuned for great upcoming updates adding further hydronic calculation functions. Please visit www.imi-hydronic.com for more information and contact details. Phone numbers to local support can be found here: http://www.imi-hydronic.com/en/contact/ IMI Hydronic Engineering International SA is the leading global provider and expert in hydronic distribution systems and room temperature control, with experience in more than 100,000 projects worldwide. We help our customers everywhere optimise HVAC systems so they deliver desired comfort with optimal efficiency. IMI Hydronic Engineering is part of the international engineering group IMI plc which is listed as a member of the FTSE 100 on the London Stock Exchange.

Screenshots

RadiatorOutput2 screens
HyTools4 screens

Verdict

The call

The clearest difference is review sentiment: RadiatorOutput at 100% against HyTools's 50%. HyTools's advantage is update cadence (every 6 weeks vs every 8 months). On price, ads, in-app purchases and monetization model 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

RadiatorOutput ships an update every 8 months, HyTools every 6 weeks. The most recent releases landed on October 31, 2026 and October 23, 2026 respectively.

Scorecard2 real differences · 8 level
RadiatorOutput versus HyTools: the parameters behind the verdict, then further details
ParameterRadiatorOutputHyTools
PriceFreeFree
Rating—4.0 (5 ratings) — better
Positive reviews100.0% of reviews — better50.0% of reviews
Number of ratings—5 — better
Update frequencyEvery 8 monthsEvery 6 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size1 MB114 MB
Age rating4+4+
DeveloperSebastjan ValicIMI Hydronic Engineering International SA

Customer experience

RadiatorOutput

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

HyTools

All ratings5 ratings
Positive60.0%
Neutral20.0%
Negative20.0%
Written reviews8 reviews
Positive50.0%
Neutral25.0%
Negative25.0%

In-app purchases

None

RadiatorOutput

No in-app purchases

None

HyTools

No in-app purchases

Questions

Is RadiatorOutput free?
RadiatorOutput is free to download, with no in-app purchases.
Is HyTools free?
HyTools is free to download, with no in-app purchases.
Do RadiatorOutput or HyTools have ads?
Neither RadiatorOutput nor HyTools shows ads.
Which is updated more often, RadiatorOutput or HyTools?
RadiatorOutput ships an update every 8 months, and HyTools every 6 weeks. Most recently, RadiatorOutput was updated on October 31, 2026 and HyTools on October 23, 2026.

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