# Viscosity Conversion vs TELEDYNE ISCO FlowCalc

The clearest difference is price: TELEDYNE ISCO FlowCalc at Free against Viscosity Conversion's $2.99. TELEDYNE ISCO FlowCalc also leads on update cadence (weekly vs every 30 months). Viscosity Conversion's advantage is ads (none vs shown). On in-app purchases, device support and iOS requirement there is nothing between them.

TELEDYNE ISCO FlowCalc is free to download; Viscosity Conversion costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Viscosity Conversion ships an update every 30 months, TELEDYNE ISCO FlowCalc weekly. The most recent releases landed on September 23, 2026 and June 8, 2026 respectively.

## The numbers

| Metric | Viscosity Conversion | TELEDYNE ISCO FlowCalc |
| --- | --- | --- |
| Price | $2.99 | **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 30 months | **Weekly** |
| Monetization | — | Ad-supported |
| Size | 1 MB | 26 MB |
| Requires iOS | **13** | 13.4 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [FutureSight Studios Ltd](https://appshunter.io/developer/1752834411) |

## What reviewers say

### Viscosity Conversion

[App page](https://appshunter.io/ios/app/viscosity-conversion/id630288155)

**Features:** macOS Compatibility, 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 Viscosity Conversion free?

Viscosity Conversion costs $2.99, with no in-app purchases.

### Is TELEDYNE ISCO FlowCalc free?

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

### Do Viscosity Conversion or TELEDYNE ISCO FlowCalc have ads?

TELEDYNE ISCO FlowCalc shows ads; Viscosity Conversion does not.

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

Viscosity Conversion ships an update every 30 months, and TELEDYNE ISCO FlowCalc weekly. Most recently, Viscosity Conversion was updated on September 23, 2026 and TELEDYNE ISCO FlowCalc on June 8, 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.*