# Frequency Loom: Acoustic Test — Compare sealed sound runs

> Compare sealed sound runs (iPhone/iPad app by Robert Corbin.)

- Source: https://appshunter.io/ios/app/frequency-loom-acoustic-test/id6771018795 (this page in markdown: same URL + `.md`)
- Developer: [Robert Corbin](https://appshunter.io/developer/1890247992)
- Category: Utilities, Productivity
- Price: $3.99
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English
- Released: 2026-05-20
- Data updated: 2026-10-08
- User reviews in markdown: https://appshunter.io/ios/app/frequency-loom-acoustic-test/id6771018795/reviews.md

## What is Frequency Loom?

See what changed at a position

Change Desk compares two intact sealed acoustic runs at the same planned position. Rank band-level changes and share a report linked to the exact stored evidence.

• Open a commissioning project → Verify → Change Desk.
• Choose baseline and later runs at the same planned position. Confirm comparable stimulus level, gain, microphone position and room conditions.
• Compare broadband and matching-band changes, then share the frozen evidence references.

Both runs must be accepted, nonvoided and seal-valid, with matching input chain, route, sample rate, scale, stimulus and band set. Matching metadata cannot prove matching physical conditions. Differences are not a transfer function, EQ recommendation or proof of improvement.

Frequency Loom is an acoustic commissioning fieldbook for installed sound systems. It turns a listener-area plan into a traceable record of positions, witnessed microphone runs, acceptance results, and handoff evidence.

Start with the job, not a generic meter. Record the site, room, work order, operator, client witness, installed system, microphone, interface, channel, and field calibration context. Lay out one or more listener areas with named measurement positions, microphone heights, plan coordinates, notes, and required repeat counts.

At each position, capture a live evidence run while the installed sound system or another external source plays pink noise, speech-shaped noise, program material, or a sweep; use Ambient only for background capture. Frequency Loom records broadband RMS, one-third-octave band values, active input route, sample rate, captured duration, clipping, and level stability. Short, clipped, unstable, incomplete, interrupted, or route-changing runs are held out of verification instead of being silently treated as valid.

The acceptance matrix evaluates project-defined targets for:

- Planned position coverage
- Listener-area level spread
- Worst cross-position band spread
- Repeat-run agreement
- Optional referenced ambient and commissioned-level limits

Every retained run receives a deterministic SHA-256 evidence seal. Later changes cause an integrity mismatch and exclude the run. Voided runs stay visible as ledger events. Export the complete job as structured JSON, CSV, or a readable commissioning report through the iOS share sheet.

The commissioning workflow requires no account or developer network service and works offline; Methodology links open external reference websites only when you tap them. Microphone samples are analyzed on device and are not saved as audio. Projects remain in private local storage until you deliberately export them. There are no analytics, ads, tracking SDKs, remote flags, or subscriptions.

Uncalibrated work is labeled relative dBFS. A documented reference match can produce referenced dB SPL values, but Frequency Loom does not claim that an iPhone, microphone, calibrator, or input chain conforms to IEC, ISO, ANSI, or AVIXA standards. The app is a commissioning evidence fieldbook, not a class-rated sound level meter or standards certificate.


## Version history (last 5 releases)

### 3.0.2 — 2026-10-02

Added App Store listings in more languages. No changes to the app itself.

### 3.0.1 — 2026-09-29

A clearer App Store name and search details. No other changes in this update.

### 3.0 — 2026-09-13

3.0: Change Desk

Change Desk compares two intact sealed acoustic runs at the same planned position. Rank band-level changes and share a report linked to the exact stored evidence.

• Open a commissioning project → Verify → Change Desk.
• Choose baseline and later runs at the same planned position. Confirm comparable stimulus level, gain, microphone position and room conditions.
• Compare broadband and matching-band changes, then share the frozen evidence references.

Both runs must be accepted, nonvoided and seal-valid, with matching input chain, route, sample rate, scale, stimulus and band set. Matching metadata cannot prove matching physical conditions. Differences are not a transfer function, EQ recommendation or proof of improvement.

### 2.3 — 2026-09-09

This update makes the commissioning fieldbook easier to use with larger text.

- Job details scroll with each phase, leaving more room for the active workflow.
- A phase menu replaces the compact segmented control at accessibility text sizes.
- Listener positions, acceptance results, input details, and action rows stack for clearer reading.
- Witness-capture and export buttons grow to show their complete labels.
- Input-route details can wrap instead of being cut short.
- Filled actions use dark labels for clearer contrast.

Your existing jobs, witnessed runs, evidence seals, and acceptance criteria remain in the same local archive.
- Added Privacy Policy and Support links in Methodology.

### 2.2 — 2026-09-08

Frequency Loom has been rebuilt as a dedicated acoustic commissioning fieldbook.

- Create site-specific jobs with work order, operator, witness, installed-system, microphone, interface, channel, and calibration context.
- Plan named listener areas and measurement positions with coordinates, microphone heights, notes, and repeat requirements.
- Capture live witnessed runs for pink noise, speech-shaped noise, program material, external sweeps, or ambient sound.
- Automatically hold short, clipped, unstable, incomplete, route-changing, or sample-rate-changing captures.
- Verify project-defined position coverage, listener-area level spread, spectral consistency, repeatability, and optional referenced level targets.
- Seal every retained run with SHA-256 and exclude altered or voided evidence from results.
- Export a complete JSON evidence package, CSV ledger, or text commissioning report through the system share sheet.
- Review the measurement boundary, current technical references, and privacy behavior in the in-app Methodology record.

This release gives Frequency Loom one focused purpose: producing a clear, inspectable acoustic commissioning record.

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## More apps by Robert Corbin

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All apps by Robert Corbin: https://appshunter.io/developer/1890247992

## Related topics

[pa system](https://appshunter.io/ios/topics/pa-system)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-08.*