# iHeatLoss vs EVsaas

The clearest difference is price: EVsaas at Free against iHeatLoss's $5.99. EVsaas also leads on update cadence (every 3 weeks vs every 12 months) and iOS requirement (11.0 vs 17.6). On ads, in-app purchases and device support there is nothing between them.

EVsaas is free to download; iHeatLoss costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

iHeatLoss ships an update every 12 months, EVsaas every 3 weeks. The most recent releases landed on October 23, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | iHeatLoss | EVsaas |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/iheatloss/id680564773/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 3 weeks** |
| Monetization | Paid | — |
| Size | 9 MB | 55 MB |
| Requires iOS | 17.6 | **11.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Navtech Software](https://appshunter.io/developer/355517263) | [zhejiang benyi new energy technology co.,ltd.](https://appshunter.io/developer/1536090136) |

## What reviewers say

### iHeatLoss

[App page](https://appshunter.io/ios/app/iheatloss/id680564773)

This app assists plumbers and heating engineers in calculating the heat output needed for each room in a building. It accounts for fabric and ventilation heat loss, providing results in Watts and BTU to help select appropriate radiators. The app also tracks multiple rooms to estimate the total heating system requirement.

**Highlights:** Room-by-room heat loss calculation, Fabric and ventilation loss inclusion, Multiple room tracking, Watts and BTU output display, Reference data for temperature and air change, Total heating output estimation

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### EVsaas

[App page](https://appshunter.io/ios/app/evsaas/id1631786780)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is iHeatLoss free?

iHeatLoss costs $5.99, with no in-app purchases.

### Is EVsaas free?

EVsaas is free to download, with no in-app purchases.

### Do iHeatLoss or EVsaas have ads?

Neither iHeatLoss nor EVsaas shows ads.

### Which is updated more often, iHeatLoss or EVsaas?

iHeatLoss ships an update every 12 months, and EVsaas every 3 weeks. Most recently, iHeatLoss was updated on October 23, 2026 and EVsaas on September 30, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*