# Twin vs Chat LLM

The clearest difference is price: Chat LLM at Free against Twin's $1.99. Twin's advantage is iOS requirement (15.0 vs 18.6). On update cadence, ads, in-app purchases and device support there is nothing between them.

Chat LLM is free to download; Twin costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Twin ships an update fortnightly, Chat LLM every 9 days. Both last shipped on October 25, 2026.

## The numbers

| Metric | Twin | Chat LLM |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[5.0 (8 ratings)](https://appshunter.io/ios/app/twin-calc/id1619292082/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | 76.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 9 days** |
| Monetization | Paid | — |
| Size | 1 MB | 26 MB |
| Requires iOS | **15.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Hiroyuki Ueda](https://appshunter.io/developer/473279916) | [David Picknell](https://appshunter.io/developer/1844054411) |

## What reviewers say

### Twin

[App page](https://appshunter.io/ios/app/twin-calc/id1619292082)

This app combines two calculators into one, allowing for side-by-side or stacked calculations. Easily copy and paste results between calculators or to other apps. It displays formulas for clarity and handles basic arithmetic operations.

**Highlights:** Two calculators in one, Side-by-side and stacked display, One-touch copy/paste between calculators, Copy results to iPhone memory, Formula display, Basic arithmetic operations

**Features:** Vision Pro support

**In-app purchases:** none


### Chat LLM

[App page](https://appshunter.io/ios/app/chat-llm/id6754822728)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Twin free?

Twin costs $1.99, with no in-app purchases.

### Is Chat LLM free?

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

### Do Twin or Chat LLM have ads?

Neither Twin nor Chat LLM shows ads.

### Which is updated more often, Twin or Chat LLM?

Twin ships an update fortnightly, and Chat LLM every 9 days. Most recently, Twin was updated on October 25, 2026 and Chat LLM on October 25, 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.*