# ThreadFon Multi vs IST+ for Mobile

The clearest difference is update cadence: ThreadFon Multi at monthly against IST+ for Mobile's every 8 months. IST+ for Mobile's advantage is iOS requirement (9.0 vs 12.0). On price, ads, 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.

ThreadFon Multi ships an update monthly, IST+ for Mobile every 8 months. The most recent releases landed on September 9, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | ThreadFon Multi | IST+ for Mobile |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.8 (4 ratings)](https://appshunter.io/ios/app/threadfon-multi-thread-calc/id1602169811/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 8 months |
| Monetization | Free | — |
| Size | 43 MB | 5 MB |
| Requires iOS | 12.0 | **9.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Dmitriy Trofimov](https://appshunter.io/developer/1598378710) | [Information Security Technology Corporation](https://appshunter.io/developer/1650535441) |

## What reviewers say

### ThreadFon Multi

[App page](https://appshunter.io/ios/app/threadfon-multi-thread-calc/id1602169811)

This tool provides detailed insights into metric, inch, pipe, and trapezoidal cylindrical threads based on ISO and ASME standards. It helps users efficiently determine essential thread specifications for various thread types.

**Highlights:** ISO Metric thread support, Unified Inch thread support, Pipe thread support, Trapezoidal thread support, Based on ISO 965 and ASME B1.1 standards, Determines fundamental thread parameters

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

**In-app purchases:** none


### IST+ for Mobile

[App page](https://appshunter.io/ios/app/ist-plus-for-mobile/id6444602007)

**In-app purchases:** none


## Frequently asked questions

### Is ThreadFon Multi free?

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

### Is IST+ for Mobile free?

IST+ for Mobile is free to download, with no in-app purchases.

### Do ThreadFon Multi or IST+ for Mobile have ads?

Neither ThreadFon Multi nor IST+ for Mobile shows ads.

### Which is updated more often, ThreadFon Multi or IST+ for Mobile?

ThreadFon Multi ships an update monthly, and IST+ for Mobile every 8 months. Most recently, ThreadFon Multi was updated on September 9, 2026 and IST+ for Mobile on September 10, 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.*