iHeatLoss vs EVsaas
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iHeatLoss
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.
- 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
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Heatloss helps plumbers, heating engineers, and installers estimate the heat output required for each room in a building. Calculate fabric and ventilation heat loss using room dimensions, component areas, U-values, internal temperatures, external temperatures, and air-change rates. Each room’s result is shown in both Watts and BTU, helping you choose a radiator with an appropriate heat output. The app keeps track of every room in the project and provides a running total for the whole building, giving a clear estimate of the overall heat output required from the heating system or boiler. Features • Calculate room-by-room heat loss • Include fabric and ventilation losses • Track multiple rooms in one building • View totals in Watts and BTU • Use room temperature and air-change reference data • Estimate the total heating output required for the property
EVsaas
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Welcome to the evsaas charging application. With evsaas, you will be able to check and control the charging state, making the charging operation of electric vehicles easier and more intelligent. features: -Connect to the electric vehicle charger via WiFi. -You can freely choose the charging amount and mode to charge. -Start / stop charging through RFID card or app. -You can view the detailed charging order. -Even if you are away, you can remotely control and manage the electric vehicle charger. -Monitor the electric vehicle charger in real time to ensure safe charging.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | iHeatLoss | EVsaas |
|---|---|---|
| Price | $5.99 | Free — better |
| Rating | 1.0 (1 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 12 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 11.0 — better |
| Further details — not scored | ||
| Size | 9 MB | 55 MB |
| Age rating | 4+ | 4+ |
| Developer | Navtech Software | zhejiang benyi new energy technology co.,ltd. |
In-app purchases
iHeatLoss
No in-app purchases
EVsaas
No in-app purchases









