# Thread Calculator vs Optimum CRM

The clearest difference is rating: Optimum CRM at 5.0 against Thread Calculator's 4.3. Optimum CRM also leads on ads (none vs shown) and update cadence (every 3 months vs every 18 months). Thread Calculator's advantage is ratings volume (13 vs 1). On price, in-app purchases, device support and iOS requirement there is nothing between them.

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

Optimum CRM holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: Thread Calculator has 13 ratings behind it against 1, so its average is the more settled of the two.

Thread Calculator ships an update every 18 months, Optimum CRM every 3 months. The most recent releases landed on September 27, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | Thread Calculator | Optimum CRM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (13 ratings)](https://appshunter.io/ios/app/thread-calculator/id1559560290/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/optimum-crm/id6743696921/reviews)** |
| Number of ratings | **13** | 1 |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 18 months | **Every 3 months** |
| Monetization | Ad-supported | **Free** |
| Size | 25 MB | 318 MB |
| Requires iOS | **15.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [GSR Gustav Stursberg GmbH](https://appshunter.io/developer/1559560292) | [Techtegy LLC](https://appshunter.io/developer/1804040372) |

## What reviewers say

### Thread Calculator

[App page](https://appshunter.io/ios/app/thread-calculator/id1559560290)

This app provides a quick and easy way to calculate thread dimensions for various units, including tap hole sizes and bolt specifications. It helps metalworkers find precise measurements for internal and external threads without consulting tables.

**Highlights:** Thread cutting calculator for multiple units, Cold forming calculator, Thread repair calculator, Tap hole and bolt diameter calculation, Saves time compared to tables

**Features:** macOS Compatibility

**In-app purchases:** none


### Optimum CRM

[App page](https://appshunter.io/ios/app/optimum-crm/id6743696921)

This AI-powered SaaS CRM platform streamlines sales, marketing, and management with automated workflows and employee performance tools. It offers comprehensive analytics to enhance customer engagement and drive business growth.

**Highlights:** AI-driven CRM management, Employee AI features, Workflow automation, Sales and marketing automation, Seamless integrations, Real-time analytics

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is Thread Calculator free?

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

### Is Optimum CRM free?

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

### Which has better reviews, Thread Calculator or Optimum CRM?

Optimum CRM is rated higher. Thread Calculator averages 4.3 out of 5 from 13 ratings, while Optimum CRM averages 5.0 from 1 ratings.

### Do Thread Calculator or Optimum CRM have ads?

Thread Calculator shows ads; Optimum CRM does not.

### Which is updated more often, Thread Calculator or Optimum CRM?

Thread Calculator ships an update every 18 months, and Optimum CRM every 3 months. Most recently, Thread Calculator was updated on September 27, 2026 and Optimum CRM on September 28, 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.*