# Arbiter vs OpenTime

The clearest difference is price: Arbiter at Free against OpenTime's $0.99. Arbiter also leads on ratings volume (16 vs 1) and iOS requirement (18.4 vs 26.2). OpenTime's advantage is in-app purchases (none vs 4) and update cadence (every 2 days vs fortnightly). On rating, ads and device support there is nothing between them.

Arbiter is free to download; OpenTime costs $0.99 up front. Arbiter sells 4 one-off in-app purchases. OpenTime asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.9 for Arbiter against 5.0 for OpenTime. That said, the two scores are not equally well evidenced: Arbiter has 16 ratings behind it against 1, so its average is the more settled of the two.

Arbiter ships an update fortnightly, OpenTime every 2 days. The most recent releases landed on October 30, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Arbiter | OpenTime |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | [4.9 (16 ratings)](https://appshunter.io/ios/app/arbiter-local-ai-chat/id6747954532/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/opentime/id6760204246/reviews)** |
| Number of ratings | **16** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 2 days** |
| Monetization | **Free** | Paid |
| Size | 40 MB | 4 MB |
| Requires iOS | **18.4** | 26.2 |
| Devices | iPhone, Mac | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Jordan Stone](https://appshunter.io/developer/1823554814) | [james tannahill](https://appshunter.io/developer/1883186220) |

## What reviewers say

### Arbiter

[App page](https://appshunter.io/ios/app/arbiter-local-ai-chat/id6747954532)

This privacy-focused AI assistant operates entirely on your device, offering offline functionality. Choose from various open-source models to suit your needs, with all conversations securely stored locally. It's ideal for brainstorming, proofreading, and exploring AI capabilities without data collection.

**Highlights:** On-device AI processing, Offline model execution, Document summarization, Privacy-focused design, Multiple AI model selection, Local data storage

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Tip | $1.99 | one-time |
| Medium Tip | $4.99 | one-time |
| Large Tip | $9.99 | one-time |
| Extra Large Tip | $19.99 | one-time |


### OpenTime

[App page](https://appshunter.io/ios/app/opentime/id6760204246)

Quickly find your open time slots by analyzing your device calendars. This app offers flexible date range views, slot duration selection, and convenient sharing options without requiring accounts or tracking your data.

**Highlights:** View free/busy slots for any date range, Slot duration picker with chip subdivision, Quick sharing of daily availability, Customizable appearance (light/dark/system), Pinned queries for one-tap access, Home screen widgets and Live Activities, Apple Watch companion app

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Arbiter free?

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

### Is OpenTime free?

OpenTime costs $0.99, with no in-app purchases.

### Which has better reviews, Arbiter or OpenTime?

OpenTime is rated higher. Arbiter averages 4.9 out of 5 from 16 ratings, while OpenTime averages 5.0 from 1 ratings.

### Do Arbiter or OpenTime have ads?

Neither Arbiter nor OpenTime shows ads.

### Which is updated more often, Arbiter or OpenTime?

Arbiter ships an update fortnightly, and OpenTime every 2 days. Most recently, Arbiter was updated on October 30, 2026 and OpenTime on November 5, 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.*