# Grace Solar vs Epiroc DTH Optimizer

The clearest difference is iOS requirement: Grace Solar at 11.0 against Epiroc DTH Optimizer's 15.1. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Grace Solar ships an update fortnightly, Epiroc DTH Optimizer every 3 weeks. The most recent releases landed on September 19, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | Grace Solar | Epiroc DTH Optimizer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/epiroc-dth-optimizer/id6566178855/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Monetization | — | Free |
| Size | 71 MB | 65 MB |
| Requires iOS | **11.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [AHASOLAR TECHNOLOGIES LIMITED](https://appshunter.io/developer/1632224285) | [Epiroc Rock Drills AB](https://appshunter.io/developer/1420003769) |

## What reviewers say

### Grace Solar

[App page](https://appshunter.io/ios/app/grace-solar/id1489691070)

**In-app purchases:** none


### Epiroc DTH Optimizer

[App page](https://appshunter.io/ios/app/epiroc-dth-optimizer/id6566178855)

This system monitors DTH drilling in real time, displaying data graphically to help operators maximize productivity and efficiency. It provides easy-to-interpret insights for optimized drilling performance.

**Highlights:** Real-time vibration sensing, DTH drilling monitoring, Graphical data display, Operator guidance, Productivity maximization, Efficiency improvement

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Grace Solar free?

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

### Is Epiroc DTH Optimizer free?

Epiroc DTH Optimizer is free to download, with no in-app purchases.

### Do Grace Solar or Epiroc DTH Optimizer have ads?

Neither Grace Solar nor Epiroc DTH Optimizer shows ads.

### Which is updated more often, Grace Solar or Epiroc DTH Optimizer?

Grace Solar ships an update fortnightly, and Epiroc DTH Optimizer every 3 weeks. Most recently, Grace Solar was updated on September 19, 2026 and Epiroc DTH Optimizer on September 16, 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.*