# TR15 Acoustic Calculator vs Hilti

The clearest difference is iOS requirement: TR15 Acoustic Calculator at 8.0 against Hilti's 15.0. 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.

TR15 Acoustic Calculator ships an update every 6 weeks, Hilti every 2 months. The most recent releases landed on October 27, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | TR15 Acoustic Calculator | Hilti |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (10 ratings)](https://appshunter.io/ios/app/hilti-firestop-selector/id1663231816/reviews)** |
| Number of ratings | — | **10** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | — | Free |
| Size | 157 MB | 150 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [American Wood Council](https://appshunter.io/developer/380481346) | [Hilti AG](https://appshunter.io/developer/390143159) |

## What reviewers say

### TR15 Acoustic Calculator

[App page](https://appshunter.io/ios/app/tr15-acoustic-calculator/id1507190662)

**Features:** macOS Compatibility

**In-app purchases:** none


### Hilti

[App page](https://appshunter.io/ios/app/hilti-firestop-selector/id1663231816)

This app helps firestop professionals, contractors, and designers find and store passive firestop solutions. It provides access to a digital library of approvals and allows users to submit engineering judgment requests.

**Highlights:** Discover code-compliant firestop solutions, Access digitized UL, DIN, and ETA approvals, Store firestop solutions in the cloud, Submit engineering judgment requests, Manage projects and explore products

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

**In-app purchases:** none


## Frequently asked questions

### Is TR15 Acoustic Calculator free?

TR15 Acoustic Calculator is free to download, with no in-app purchases.

### Is Hilti free?

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

### Do TR15 Acoustic Calculator or Hilti have ads?

Neither TR15 Acoustic Calculator nor Hilti shows ads.

### Which is updated more often, TR15 Acoustic Calculator or Hilti?

TR15 Acoustic Calculator ships an update every 6 weeks, and Hilti every 2 months. Most recently, TR15 Acoustic Calculator was updated on October 27, 2026 and Hilti on October 22, 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.*