# fCalendar vs Program Heat Stress®

The clearest difference is price: Program Heat Stress® at Free against fCalendar's $1.99. Program Heat Stress® also leads on iOS requirement (8.0 vs 13.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

Program Heat Stress® is free to download; fCalendar costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

fCalendar ships an update every 9 months, Program Heat Stress® every 6 months. The most recent releases landed on October 11, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | fCalendar | Program Heat Stress® |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[3.9 (28 ratings)](https://appshunter.io/ios/app/fcalendar/id348590162/reviews)** | — |
| Number of ratings | **28** | — |
| Positive reviews | 59.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 6 months** |
| Monetization | Free | — |
| Size | 11 MB | 5 MB |
| Requires iOS | 13.0 | **8.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Farzad Rashvand](https://appshunter.io/developer/348590165) | [SOCIETE INDUSTRIELLE LESAFFRE](https://appshunter.io/developer/1284863866) |

## What reviewers say

### fCalendar

[App page](https://appshunter.io/ios/app/fcalendar/id348590162)

This app functions as a desktop calendar, allowing users to jot down notes and reminders. It facilitates conversions between the Persian, Gregorian, and Hijri calendars, and helps users find specific weekdays for any given date.

**Highlights:** Note-taking and reminders, Persian to Gregorian conversion, Gregorian to Persian conversion, Hijri calendar conversion, Weekday finder for any date, Add, edit, and delete notes, Beautiful interface

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

**In-app purchases:** none


### Program Heat Stress®

[App page](https://appshunter.io/ios/app/program-heat-stress/id993601879)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is fCalendar free?

fCalendar costs $1.99, with no in-app purchases.

### Is Program Heat Stress® free?

Program Heat Stress® is free to download, with no in-app purchases.

### Do fCalendar or Program Heat Stress® have ads?

Neither fCalendar nor Program Heat Stress® shows ads.

### Which is updated more often, fCalendar or Program Heat Stress®?

fCalendar ships an update every 9 months, and Program Heat Stress® every 6 months. Most recently, fCalendar was updated on October 11, 2026 and Program Heat Stress® 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.*