# SENSORCheck for VIEWER vs Epistle

The clearest difference is in-app purchases: SENSORCheck for VIEWER at none against Epistle's 5. Epistle's advantage is ratings volume (9 vs 1). On price, rating, review sentiment and update cadence there is nothing between them.

Both are free to download. Epistle sells 5 in-app purchases, starting at $17.99 per month. SENSORCheck for VIEWER asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for SENSORCheck for VIEWER against 5.0 for Epistle. That said, the two scores are not equally well evidenced: Epistle has 9 ratings behind it against 1, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

SENSORCheck for VIEWER ships an update monthly, Epistle every 3 weeks. The most recent releases landed on June 1, 2026 and August 24, 2026 respectively.

## The numbers

| Metric | SENSORCheck for VIEWER | Epistle |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/sensorcheck-for-viewer/id1146161843/reviews) | [5.0 (9 ratings)](https://appshunter.io/ios/app/epistle/id6498960558/reviews) |
| Number of ratings | 1 | **9** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 9 MB | 50 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SENSOR CHECK LLC](https://appshunter.io/developer/1146158249) | [Epistle LLC](https://appshunter.io/developer/1453262687) |

## What reviewers say

### SENSORCheck for VIEWER

[App page](https://appshunter.io/ios/app/sensorcheck-for-viewer/id1146161843)

This application allows registered business customers to monitor temperature sensors in their environment. It provides a simple interface for viewing real-time data from these sensors.

**Highlights:** View temperature sensor data, Real-time monitoring, For registered SENSORCheck customers, Environmental monitoring

**Features:** macOS Compatibility

**In-app purchases:** none


### Epistle

[App page](https://appshunter.io/ios/app/epistle/id6498960558)

This app facilitates communication and financial support for missionaries. It allows for easy sharing of ministry updates with photos and videos, automatically sending them to ministry partners who can respond with engagement. It simplifies the process of connecting with supporters and managing ministry outreach.

**Highlights:** Share ministry updates with photos and video, Automatic update distribution to partners, Ministry partner engagement (likes, prayers, comments), Manage ministry sites, Connect with ministry partners, Automated email platform

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One Epistle Site | $17.99 | per month |
| Two Epistle Sites | $39.99 | per month |
| Three Epistle Sites | $59.99 | per month |
| Four Epistle Sites | $79.99 | per month |
| Five Epistle Sites | $89.99 | per month |


## Frequently asked questions

### Is SENSORCheck for VIEWER free?

SENSORCheck for VIEWER is free to download, with no in-app purchases.

### Is Epistle free?

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

### Which has better reviews, SENSORCheck for VIEWER or Epistle?

SENSORCheck for VIEWER and Epistle are both rated 5.0 out of 5 on the App Store, from 1 and 9 ratings respectively.

### Do SENSORCheck for VIEWER or Epistle have ads?

Neither SENSORCheck for VIEWER nor Epistle shows ads.

### Which is updated more often, SENSORCheck for VIEWER or Epistle?

SENSORCheck for VIEWER ships an update monthly, and Epistle every 3 weeks. Most recently, SENSORCheck for VIEWER was updated on June 1, 2026 and Epistle on August 24, 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.*