# Sgrum vs ATOM

The clearest difference is in-app purchases: Sgrum at none against ATOM's 19. Sgrum also leads on review sentiment (13% vs 4%) and iOS requirement (12.0 vs 15.6). ATOM's advantage is update cadence (every 2 months vs every 4 months). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. ATOM sells 19 in-app purchases, starting at $0.99 per month. Sgrum asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 3.0 for Sgrum against 3.0 for ATOM. Both are backed by a comparable volume of ratings — 1 and 2 respectively. Written reviews are what separate them: 13% of Sgrum's written reviews are positive against 4% of ATOM's.

Sgrum ships an update every 4 months, ATOM every 2 months. The most recent releases landed on June 25, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Sgrum | ATOM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (1 ratings)](https://appshunter.io/ios/app/sgrum/id1266233066/reviews) | [3.0 (2 ratings)](https://appshunter.io/ios/app/atom/id1501313647/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | **13.5% of reviews** | 4.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 15 MB | 254 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SGRUM K.K.](https://appshunter.io/developer/1266233065) | [ATOM tech Inc.](https://appshunter.io/developer/1487907066) |

## What reviewers say

### Sgrum

[App page](https://appshunter.io/ios/app/sgrum/id1266233066)

This platform allows parents and students to securely receive messages, photos, and documents from sports clubs and lessons. It features event calendars, attendance tracking, and easy communication for absences. Users can also manage lesson bookings and payments.

**Highlights:** Secure message and file delivery, Event calendar with attendance tracking, Easy absence reporting, Lesson booking and rescheduling, Monthly payment management, Family sharing of information

**Features:** macOS Compatibility

**In-app purchases:** none


### ATOM

[App page](https://appshunter.io/ios/app/atom/id1501313647)

Control and manage your ATOM series smart devices from a single application. This app allows for centralized operation and management of various smart home products.

**Highlights:** Control ATOM series smart devices, Manage smart devices, Centralized operation, Single application interface

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

**In-app purchases (19)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ViewSay Lite · 月額 · 1台 | $0.99 | per month |
| ViewSay Lite · 月額 · 2台 | $1.99 | per month |
| モーション検知録画（Lite） · 月額 · 1台 | $1.99 | per month |
| モーション検知録画（Lite） · 月額 · 2台 | $2.99 | per month |
| ViewSay Lite · 月額 · 4台 | $3.99 | per month |
| モ一ション検知無制限録画（14日）（1台） | $3.99 | per month |
| ViewSay Lite · 月額 · 5台 | $5.99 | per month |
| ViewSay Lite · 月額 · 6台 | $6.99 | per month |
| ViewSay Lite · 月額 · 7台 | $7.99 | per month |
| モ一ション検知無制限録画（14日）（2台） | $7.99 | per month |
| ViewSay Lite · 月額 · 8台 | $8.99 | per month |
| モ一ション検知無制限録画（14日）（3台） | $11.99 | per month |
| モ一ション検知無制限録画（14日）（4台） | $14.99 | per month |
| モ一ション検知無制限録画（14日）（5台） | $19.99 | per month |
| モ一ション検知無制限録画（14日）（6台） | $24.99 | per month |
| モ一ション検知無制限録画（14日）（8台） | $29.99 | per month |
| モ一ション検知無制限録画（14日）（7台） | $29.99 | per month |
| モ一ション検知無制限録画（14日）（10台） | $39.99 | per month |
| モ一ション検知無制限録画（14日）（9台） | $39.99 | per month |


## Frequently asked questions

### Is Sgrum free?

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

### Is ATOM free?

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

### Which has better reviews, Sgrum or ATOM?

Sgrum and ATOM are both rated 3.0 out of 5 on the App Store, from 1 and 2 ratings respectively.

### Do Sgrum or ATOM have ads?

Neither Sgrum nor ATOM shows ads.

### Which is updated more often, Sgrum or ATOM?

Sgrum ships an update every 4 months, and ATOM every 2 months. Most recently, Sgrum was updated on June 25, 2026 and ATOM on September 23, 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.*