# Model Usage vs Charge

The clearest difference is update cadence: Model Usage at every 3 days against Charge's fortnightly. Model Usage also leads on device support (6 vs 1). On price, ads, in-app purchases 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.

Model Usage ships an update every 3 days, Charge fortnightly. Both last shipped on October 3, 2026.

## The numbers

| Metric | Model Usage | Charge |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Fortnightly |
| Monetization | — | Free |
| Size | 5 MB | 2 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad, Mac, Apple TV, Apple Watch, Vision Pro** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Rayan Khan](https://appshunter.io/developer/1863389662) | [Dusan Baek](https://appshunter.io/developer/1530611513) |

## What reviewers say

### Model Usage

[App page](https://appshunter.io/ios/app/model-usage/id6761831599)

**Features:** Apple Watch app, iMessage stickers

**In-app purchases:** none


### Charge

[App page](https://appshunter.io/ios/app/charge-ai-usage-tracker/id6796766465)

Track your AI coding usage and costs across various providers directly from your iPhone. Monitor your remaining time, weekly caps, and daily spending with at-a-glance widgets and detailed dashboards. Setup is quick, and privacy is prioritized with no access to your code or conversations.

**Highlights:** Rate-limit gauges per provider, Burn-rate forecasts, Cost dashboard (daily, weekly, monthly), Plan badges and account separation, Multi-computer support, Home and Lock Screen widgets, Streak heatmap and cost trend

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

**In-app purchases:** none


## Frequently asked questions

### Is Model Usage free?

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

### Is Charge free?

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

### Do Model Usage or Charge have ads?

Neither Model Usage nor Charge shows ads.

### Which is updated more often, Model Usage or Charge?

Model Usage ships an update every 3 days, and Charge fortnightly. Most recently, Model Usage was updated on October 3, 2026 and Charge on October 3, 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.*