# opchat vs Elm

The clearest difference is in-app purchases: Elm at none against opchat's 2. Elm also leads on iOS requirement (15.1 vs 17.0). opchat's advantage is update cadence (every 2 days vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. opchat sells 2 one-off in-app purchases. Elm asks for nothing beyond the download.

opchat ships an update every 2 days, Elm every 2 months. The most recent releases landed on October 14, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | opchat | Elm |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/opchat-private-on-device-ai/id6761932211/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 2 months |
| Monetization | Free | — |
| Size | 162 MB | 22 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [Przemyslaw Klosek](https://appshunter.io/developer/1536276533) | [Joshua Arnold](https://appshunter.io/developer/1882933942) |

## What reviewers say

### opchat

[App page](https://appshunter.io/ios/app/opchat-private-on-device-ai/id6761932211)

Chat with various AI models using your own API keys or run them locally on your device. Your data and keys remain private, never passing through the app's servers. Create custom AI assistants and utilize built-in tools like web search and image generation.

**Highlights:** BYOK (Bring Your Own Keys) for major AI models, On-device model execution for offline use, Customizable AI personas, Integrated web search and image generation, Conversation organization and export, Fully customizable interface themes and fonts

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Unlock Promo | $1.99 | one-time |
| Pro Unlock | $4.99 | one-time |


### Elm

[App page](https://appshunter.io/ios/app/elm-notes-docs-and-wiki/id6764853996)

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

**In-app purchases:** none


## Frequently asked questions

### Is opchat free?

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

### Is Elm free?

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

### Do opchat or Elm have ads?

Neither opchat nor Elm shows ads.

### Which is updated more often, opchat or Elm?

opchat ships an update every 2 days, and Elm every 2 months. Most recently, opchat was updated on October 14, 2026 and Elm on October 31, 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.*