Comparison

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.

Head to head
About

Building Acoustics Partner

Features
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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.

About

Function Fitter

Features
Read full description

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

Building Acoustics Partner4 screens
Function Fitter4 screens

Verdict

The call

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

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

UpkeepUpdate frequency

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.

Scorecard2 real differences ยท 4 level
Building Acoustics Partner versus Function Fitter: the parameters behind the verdict, then further details
ParameterBuilding Acoustics PartnerFunction Fitter
PriceFreeFree
Update frequencyEvery 4 monthsMonthly โ€” better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPodiPhone, iPad
Requires iOS15.0 โ€” better17.0
Further details โ€” not scored
Size160 MB4 MB
Age rating4+4+
DeveloperHottinger Bruel & Kjaer A/S29Apps LLC

In-app purchases

None

Building Acoustics Partner

No in-app purchases

None

Function Fitter

No in-app purchases

Questions

Is Building Acoustics Partner free?
Building Acoustics Partner is free to download, with no in-app purchases.
Is Function Fitter free?
Function Fitter is free to download, with no in-app purchases.
Do Building Acoustics Partner or Function Fitter have ads?
Neither Building Acoustics Partner nor Function Fitter shows ads.
Which is updated more often, Building Acoustics Partner or Function Fitter?
Building Acoustics Partner ships an update every 4 months, and Function Fitter monthly. Most recently, Building Acoustics Partner was updated on October 10, 2026 and Function Fitter on September 25, 2026.

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