# F4S vs TELEDYNE ISCO FlowCalc

The clearest difference is ads: F4S at none against TELEDYNE ISCO FlowCalc's shown. TELEDYNE ISCO FlowCalc's advantage is update cadence (weekly vs every 2 months) and iOS requirement (13.4 vs 15.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

F4S ships an update every 2 months, TELEDYNE ISCO FlowCalc weekly. The most recent releases landed on October 29, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | F4S | TELEDYNE ISCO FlowCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.5 (2 ratings)](https://appshunter.io/ios/app/teledyne-isco-flowcalc/id6504916802/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | — | Ad-supported |
| Size | 25 MB | 26 MB |
| Requires iOS | 15.0 | **13.4** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [CAPSOL, LLC](https://appshunter.io/developer/1394185059) | [FutureSight Studios Ltd](https://appshunter.io/developer/1752834411) |

## What reviewers say

### F4S

[App page](https://appshunter.io/ios/app/f4s/id1451079732)

**Features:** Vision Pro support

**In-app purchases:** none


### TELEDYNE ISCO FlowCalc

[App page](https://appshunter.io/ios/app/teledyne-isco-flowcalc/id6504916802)

This utility app provides quick and accurate open channel flow rate calculations for field or office use. Select your measurement method, enter dimensions and head/velocity, and receive instant results. It supports multiple flow methods, area-velocity calculations, and unit switching.

**Highlights:** Instant flow rate calculations, Multiple weir and flume types, Area-velocity mode for pipes, Save favorite site setups, Imperial and metric unit support, Based on ISCO Handbook formulas

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is F4S free?

F4S is free to download, with no in-app purchases.

### Is TELEDYNE ISCO FlowCalc free?

TELEDYNE ISCO FlowCalc is free to download, with no in-app purchases.

### Do F4S or TELEDYNE ISCO FlowCalc have ads?

TELEDYNE ISCO FlowCalc shows ads; F4S does not.

### Which is updated more often, F4S or TELEDYNE ISCO FlowCalc?

F4S ships an update every 2 months, and TELEDYNE ISCO FlowCalc weekly. Most recently, F4S was updated on October 29, 2026 and TELEDYNE ISCO FlowCalc on October 2, 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.*