# Instock vs Harpy Alerts

The clearest difference is in-app purchases: Harpy Alerts at none against Instock's 1. Harpy Alerts also leads on ads (none vs shown) and update cadence (every 3 days vs every 4 weeks). Instock's advantage is iOS requirement (13.0 vs 18.5). On price and device support there is nothing between them.

Both are free to download. Instock sells 1 in-app purchase, starting at $9.99 per month. Harpy Alerts asks for nothing beyond the download.

Instock ships an update every 4 weeks, Harpy Alerts every 3 days. The most recent releases landed on October 30, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Instock | Harpy Alerts |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (15 ratings)](https://appshunter.io/ios/app/instock-shopping/id6445827103/reviews)** | — |
| Number of ratings | **15** | — |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 4 weeks | **Every 3 days** |
| Monetization | Free with in-app purchases | — |
| Size | 38 MB | 8 MB |
| Requires iOS | **13.0** | 18.5 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [JNJ Software LTD](https://appshunter.io/developer/1674038912) | [Andy Geer](https://appshunter.io/developer/6813313462) |

## What reviewers say

### Instock

[App page](https://appshunter.io/ios/app/instock-shopping/id6445827103)

Never miss a product drop or restock again. This assistant notifies you in real-time when items become available across hundreds of retailers. Customize your feed with desired products or focus on discounts.

**Highlights:** Real-time restock notifications, Customizable product feed, Discounts-only feed, Live release feed, Direct add-to-cart links, Autofill for faster checkout

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Subscription | $9.99 | per month |


### Harpy Alerts

[App page](https://appshunter.io/ios/app/harpy-alerts/id6813313460)

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

**In-app purchases:** none


## Frequently asked questions

### Is Instock free?

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

### Is Harpy Alerts free?

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

### Do Instock or Harpy Alerts have ads?

Instock shows ads; Harpy Alerts does not.

### Which is updated more often, Instock or Harpy Alerts?

Instock ships an update every 4 weeks, and Harpy Alerts every 3 days. Most recently, Instock was updated on October 30, 2026 and Harpy Alerts on October 26, 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.*