# TechRef vs Thread Chart

The clearest difference is iOS requirement: Thread Chart at 15.6 against TechRef's 17.6. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. TechRef sells 1 one-off in-app purchase and Thread Chart sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | TechRef | Thread Chart |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 days | — |
| Size | 4 MB | 50 MB |
| Requires iOS | 17.6 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | +4 |
| Developer | [MASARU KATO](https://appshunter.io/developer/1883480774) | [Sachinbhai Surani](https://appshunter.io/developer/1838685550) |

## What reviewers say

### TechRef

[App page](https://appshunter.io/ios/app/techref/id6775818457)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| TechRef Pro | $6.99 | one-time |


### Thread Chart

[App page](https://appshunter.io/ios/app/thread-chart-tap-drill-and-cnc/id6799089886)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Premium | $14.99 | one-time |


## Frequently asked questions

### Is TechRef free?

TechRef is free to download, with in-app purchases available.

### Is Thread Chart free?

Thread Chart is free to download, with in-app purchases available.

### Do TechRef or Thread Chart have ads?

Neither TechRef nor Thread Chart shows ads.

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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.*