# Heat Exchanger Performance vs Everwhen

The clearest difference is price: Everwhen at Free against Heat Exchanger Performance's $4.99. Everwhen also leads on update cadence (every 2 weeks vs every 6 months). Heat Exchanger Performance's advantage is iOS requirement (14.3 vs 18.0). On ads, in-app purchases and device support there is nothing between them.

Everwhen is free to download; Heat Exchanger Performance costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Heat Exchanger Performance ships an update every 6 months, Everwhen every 2 weeks. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Heat Exchanger Performance | Everwhen |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 weeks** |
| Monetization | Paid | — |
| Size | 1 MB | 17 MB |
| Requires iOS | **14.3** | 18.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Kaup Shenoy Associates](https://appshunter.io/developer/460148822) | [Jan Litjens](https://appshunter.io/developer/1886790215) |

## What reviewers say

### Heat Exchanger Performance

[App page](https://appshunter.io/ios/app/heat-exchanger-performance/id499929799)

Evaluate shell and tube heat exchanger performance, including overall heat transfer U-coefficient and maintenance needs based on performance changes. Save and reload multiple heat exchanger data sets for continuous monitoring.

**Highlights:** Evaluate overall heat transfer U-coefficient, Determine maintenance requirements, Save and reload multiple heat exchanger data, Select common industrial fluids, Create custom fluid properties, Edit data in SI and USCS units, Compute heat transfer area

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

**In-app purchases:** none


### Everwhen

[App page](https://appshunter.io/ios/app/everwhen-last-time-tracker/id6797666898)

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

**In-app purchases:** none


## Frequently asked questions

### Is Heat Exchanger Performance free?

Heat Exchanger Performance costs $4.99, with no in-app purchases.

### Is Everwhen free?

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

### Do Heat Exchanger Performance or Everwhen have ads?

Neither Heat Exchanger Performance nor Everwhen shows ads.

### Which is updated more often, Heat Exchanger Performance or Everwhen?

Heat Exchanger Performance ships an update every 6 months, and Everwhen every 2 weeks. Most recently, Heat Exchanger Performance was updated on October 30, 2026 and Everwhen on October 31, 2026.

---

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