TR15 Acoustic Calculator vs Hilti
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TR15 Acoustic Calculator
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Based upon the data and methodologies compiled in American Wood Council's Technical Report No. 15 (TR15), this calculator simplifies the calculation of sound transmission through wood-frame floor and ceilings. Sound transmission class (STC) and Impact insulation class results are given as well as the following detail data at ⅓ octave band center frequency ranging from 125 Hz to 4000 Hz: TL / STC: - Floor Layer Estimated Transmission Loss - Ceiling Layer Estimated Transmission Loss - System Effect - Estimated Transmission Loss - ASTM E413 Reference Contour - STC shifted Reference Contour - Estimated Transmission Loss Deficiencies ISPL / IIC: - STC Transmission Loss - ISPL Adjustment - Estimated Impact Sound Pressure Level - ASTM E989 Reference Contour - Shifted Reference Contour - Impact Insulation Deficiencies
Hilti
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.
- 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
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The Hilti Firestop Selector offers a comprehensive answer to passive firestop product and solution needs. The Hilti Firestop Selector allows Firestop Professionals, contractors and designers to find and conveniently store firestop solutions in the cloud for future access or sharing with stakeholders. The app also allows users to submit an engineering judgment (EJ) request from anywhere. Easily discover code compliant solutions using our digital approvals library, which includes thousands of digitized UL, DIN, and ETA approvals and abbreviated summaries (typicals) or simplified trade details for various firestop applications. Effortlessly handle your projects, explore products and approvals, and request EJs all from the convenience of your mobile device.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | TR15 Acoustic Calculator | Hilti |
|---|---|---|
| Price | Free | Free |
| Rating | — | 3.0 (10 ratings) — better |
| Positive reviews | — | 0.0% of reviews |
| Number of ratings | — | 10 — better |
| Update frequency | Every 6 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 8.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 157 MB | 150 MB |
| Age rating | 4+ | 4+ |
| Developer | American Wood Council | Hilti AG |
In-app purchases
TR15 Acoustic Calculator
No in-app purchases
Hilti
No in-app purchases
Questions
Is TR15 Acoustic Calculator free?
Is Hilti free?
Do TR15 Acoustic Calculator or Hilti have ads?
Which is updated more often, TR15 Acoustic Calculator or Hilti?
Other comparisons
