Notice drift earlier
Compare today's sample with a recording made when the equipment sounded normal.
Private equipment sound comparisons
Know when a familiar sound starts to change.
SoundBaseline records what your equipment normally sounds like, then compares future 10-second samples entirely on your iPhone.
Workshop extractorToday · 09:42
27/ 100
Some changeCompared with reference
+1.8 dB level+142 Hz spectral centre
Native iPhone appDesigned for iOS 18+
On-device analysisNo cloud processing
Private iCloud syncAcross your Apple devices
Zero trackingNo ads or analytics SDKs
Who it is for
Built for people who know their equipment.
SoundBaseline helps households, workshops, technicians, and small businesses turn a familiar sound into a repeatable point of comparison.
- Fans and extractors
- Pumps
- Compressors
- Workshop tools
- Household appliances
Why it is valuable
Memory is vague. A baseline is measurable.
Replace guesswork
See a consistent score plus level, tonal, and frequency-band context for each comparison.
Keep useful history
Add observations and review dated checks instead of trying to remember when the change began.
How it works
A consistent 10-second comparison.
The result measures acoustic difference from your own reference. It does not diagnose a fault, predict failure, or confirm safety.
- 01
Create an equipment profile
Name the fan, pump, tool, or appliance you want to check over time.
- 02
Record the normal sound
Capture a 10-second reference under conditions you can repeat later.
- 03
Repeat the recording
Use the same phone position, distance, equipment load, and surroundings.
- 04
Review the difference
Read the score, acoustic measurements, band chart, and your dated notes together.
Reading the score
One scale, four plain-language bands.
0–14Very close15–34Some change35–59Clear change60–100Large change
Full feature list
Useful acoustic context, without surveillance.
Capture
A repeatable reference
- Create a named profile for each appliance, tool, or machine
- Record a fixed 10-second mono reference sample
- Record comparisons with the same guided duration
- Reject samples that are too short, invalid, or nearly silent
- Keep recordings available for later review
Compare
Change made visible
- See an easy-to-read difference score from 0 to 100
- Review the change in overall sound level
- Compare spectral centre to spot tonal shifts
- Inspect a frequency-band chart for where sound changed
- Use plain-language score bands instead of unexplained numbers
Remember
A private equipment history
- Keep dated comparison results for each equipment profile
- Add your own observation notes to every check
- Store data locally with optional private iCloud sync
- Work without a developer account or external backend
- No advertising, analytics, tracking, or data resale
Local-first by design
Your recordings stay yours.
Recording and analysis happen on your iPhone. Data stays local and, when available, can sync through Apple's private CloudKit database. There is no SoundBaseline account, developer-run processing service, advertising profile, or analytics pipeline.
Roadmap
More context, while keeping every result honest.
This is a proposed roadmap, not a promise of release dates. Acoustic change will remain clearly separate from diagnosis and safety advice.
Available now
The complete core
- Reference and comparison recordings
- 0–100 difference score
- Level and spectral measurements
- Frequency-band chart
- Notes, history, and private iCloud sync
Proposed next
Better repeatability
- Trend views
- Recording-condition checklist
- Reference context notes or photo
- Baseline version history
- Local reminders and Shortcuts
Exploring
Deeper comparison
- User-defined local thresholds
- Spectral overlays
- Explicit export
- Folders, tags, and search
- Widgets and repeatability indicator
Support
Better comparisons start with consistency.
Repeat the conditions
- Use the same phone position, distance, equipment load, and surroundings.
- Avoid speech, wind, and unrelated machinery.
- If the sample is too quiet, move closer and try again.
Permission is only needed to record
Restore microphone access in iOS Settings under SoundBaseline. You can still review saved results without microphone access.
Never record a private conversation.
Privacy policy
Your equipment data is not our business.
Last updated 23 August 2026
What the app handles
Equipment names, recordings, acoustic measurements, dates, and notes that you choose to create. Microphone access is requested only when you start recording.
Storage and iCloud
Data is stored on your iPhone. When available, Apple CloudKit may synchronise it through your private iCloud account. The developer cannot browse your private database.
No advertising or tracking
SoundBaseline has no ads, analytics, tracking, third-party SDKs, developer accounts, or developer-operated server. Your data is not sold to advertisers or data brokers.
Retention and deletion
Data remains until you delete it. Deleting an equipment profile removes its recordings, results, and notes and requests deletion from synchronised private iCloud storage.
Your choices
You can revoke microphone permission in iOS Settings and disable iCloud for the app in your Apple Account settings.
Children
SoundBaseline is a general utility and is not directed to children. It knowingly collects no information through a developer service.
Contact
Need a hand?
Include the app version, iPhone model, iOS version, and steps to reproduce. Never send a recording containing a private conversation.