Building Acoustics Partner vs Function Fitter
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
Building Acoustics Partner
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Together with HBK 2255 sound level meter, Building Acoustics Partner is a complete solution for sound insulation measurements. Building Acoustics Partner provides full workflow support for sound insulation testing according to national and international standards, including ISO 16283. Easy and intelligent measurement reuse helps to make your testing as efficient as possible, while instant result calculations and measurement quality indicators give you confidence in your data. Describe site conditions using photo, video, text and voice note annotations. Building Acoustics Partner is also prepared for the most challenging testing situations, with the ability to use serial measurement of individual 1/3 octave bands, markers to exclude unwanted sounds, and more.
Function Fitter
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Function curve fitting using custom function that you enter. Reads data values either from file or manual entry, and tries to fit your function to the data by adjusting 1 to 4 parameters for a least-squares best fit. For enjoyment only, NOT for serious data needs. This is minimalist by design with no ads, no in-app purchases, no bells and whistles, and no fancy moving graphics to distract you, just fun. Note: Entertainment value only, fun using different parameter starting values.
Screenshots
Verdict
The clearest difference is update cadence: Function Fitter at monthly against Building Acoustics Partner's every 4 months. Building Acoustics Partner's advantage is iOS requirement (15.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Building Acoustics Partner ships an update every 4 months, Function Fitter monthly. The most recent releases landed on October 10, 2026 and September 25, 2026 respectively.
| Parameter | Building Acoustics Partner | Function Fitter |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 4 months | Monthly โ better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 15.0 โ better | 17.0 |
| Further details โ not scored | ||
| Size | 160 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Hottinger Bruel & Kjaer A/S | 29Apps LLC |
In-app purchases
Building Acoustics Partner
No in-app purchases
Function Fitter
No in-app purchases
Questions
Is Building Acoustics Partner free?
Is Function Fitter free?
Do Building Acoustics Partner or Function Fitter have ads?
Which is updated more often, Building Acoustics Partner or Function Fitter?
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