# ISOL ERP vs Viewer for Trello

The clearest difference is in-app purchases: ISOL ERP at none against Viewer for Trello's 1. Viewer for Trello's advantage is update cadence (every 4 days vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Viewer for Trello sells 1 one-off in-app purchase. ISOL ERP asks for nothing beyond the download.

ISOL ERP ships an update every 2 months, Viewer for Trello every 4 days. The most recent releases landed on October 11, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | ISOL ERP | Viewer for Trello |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 days** |
| Size | 76 MB | 2 MB |
| Requires iOS | **15.4** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple TV |
| Age rating | 4+ | 4+ |
| Developer | [nguyen phuc dat](https://appshunter.io/developer/1457819259) | [Appic Ltd.](https://appshunter.io/developer/984875987) |

## What reviewers say

### ISOL ERP

[App page](https://appshunter.io/ios/app/isol-erp/id1465532083)

**Features:** macOS Compatibility

**In-app purchases:** none


### Viewer for Trello

[App page](https://appshunter.io/ios/app/viewer-for-trello/id1548761411)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Board Access | $4.99 | one-time |


## Frequently asked questions

### Is ISOL ERP free?

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

### Is Viewer for Trello free?

Viewer for Trello is free to download, with in-app purchases available.

### Do ISOL ERP or Viewer for Trello have ads?

Neither ISOL ERP nor Viewer for Trello shows ads.

### Which is updated more often, ISOL ERP or Viewer for Trello?

ISOL ERP ships an update every 2 months, and Viewer for Trello every 4 days. Most recently, ISOL ERP was updated on October 11, 2026 and Viewer for Trello on October 10, 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.*