Transfer Function vs Tempi
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Transfer Function
This app performs dual-FFT acoustic analysis for sound systems, including music. It offers magnitude, phase, and coherence graphs, a delay finder, and a signal generator. It can operate with internal microphones or external audio interfaces for comprehensive sound system monitoring and equalization.
- Dual-FFT acoustic analysis
- Magnitude, Phase, Coherence graphs
- Delay Finder
- Signal Generator
- Music as signal source
- Internal microphone support
- Two-channel audio interface compatibility
Read full descriptionHide full description
Transfer Function is a dual-FFT acoustic analysis app that is used for sound system audio analysis. Since it can operate with music as the signal source, it can be used during a musical performance to monitor and turn the system equalization during the show. Transfer function includes: -- Magnitude Graph -- Phase Graph -- Coherence Plot -- Delay Finder -- Signal Generator Normally a transfer function requires a two-channel interface, and that is true with this one, also, if you want to use it with program material (music). However, you can use our Transfer Funciton with the internal iOS microphone, if you can send the pink noise generator output to the sound system input. In this configuration, the internal generator is routed back to the input as the reference channel. You can measure delay, magnitude, and phase using this setup. When you use Transfer Function with a two-channel audio interface to run, such as the Studio Six Digital iAudioInterface2, then you can also use any audio source as the test signal, including music. See our website for more information.
Tempi
This app provides real-time beat detection and tempo analysis for musicians. It measures your band's tempo live while playing and allows for post-performance analysis to identify areas for improvement. It can also be used as a metronome alternative for individual practice.
- Real-time BPM detection
- Live tempo analysis
- Post-performance recording analysis
- Tap for tempo functionality
- Save and export recordings
- Nighttime theme option
Read full descriptionHide full description
Tempi is a live BPM counter and beat tracking app. Think of it as a reverse metronome — instead of keeping time for you, it listens to the music and detects the tempo in real time. Whether you're a musician, DJ, or VJ, Tempi gives you a real-time tempo tracker that follows along as you play, with remarkable accuracy across every genre. * Listens while you (or your entire band) play * Reports the BPM (beats per minute) of your performance in real time with remarkable accuracy * Analyze your sessions to pinpoint and improve problem areas * Flash the screen on the beat with BeatSync * Sync pedals, loopers, and apps to the beat via Ableton Link * Tap for Tempo to quickly get a BPM reading at any time * Switch themes for easy nighttime use or just to suit your style * Save recording sessions for later analysis * Sync lighting, VFX, and other devices to the beat via Ableton Link * Graphs the BPM of tracks in your set over time * Includes an EQ visualizer * Fine-tune responsiveness, frequency filters, and detection sensitivity
Screenshots
Verdict
The clearest difference is review sentiment: Tempi at 72% against Transfer Function's 25%. Tempi also leads on price ($6.99 vs $49.99) and rating (4.7 vs 3.0). On ads, device support and iOS requirement 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
Transfer Function costs $49.99 and Tempi $6.99 up front. Transfer Function sells 1 one-off in-app purchase. Tempi asks for nothing beyond the download.
Tempi holds the better App Store score, 4.7 against 3.0. That said, the two scores are not equally well evidenced: Tempi has 337 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 25% of Transfer Function's written reviews are positive against 72% of Tempi's.
Transfer Function ships an update every 6 months, Tempi every 3 months. Both last shipped on October 24, 2026.
| Parameter | Transfer Function | Tempi |
|---|---|---|
| Price | $49.99 | $6.99 — better |
| Rating | 3.0 (2 ratings) | 4.7 (337 ratings) — better |
| Positive reviews | 25.0% of reviews | 72.1% of reviews — better |
| Number of ratings | 2 | 337 — better |
| Update frequency | Every 6 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Paid | Free — better |
| Best chart rank | — | #171 — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Requires iOS | 15.0 — better | 16.2 |
| Further details — not scored | ||
| Size | 34 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Andrew Smith | Made by Windmill, LLC |
Customer experience
Transfer Function
Tempi
Bugs and requests
Transfer Function
Not enough reviews yet to summarise bugs or requests.
Tempi
Reported bugs
21 issues- Temple kept going down when playing faster
- Said playing 75 when clearly playing 104
- Said playing 120 when playing slow song at 60
- Freezes up after a minute
- Loses track of bpm and needs reset
Show 16 moreShow fewer
- App keeps saying 80 bpm when changed to 120
- Player stops when recording starts
- App stops when player app turns on
- Doesn't measure from players on same device
- Tempo detection is all over the place
- Doesn't work when playing audio from the same phone
- Manual tapping feature is terrible
- Listening feature doesn't know what sounds it's listening to
- Tempo changes drastically with simple audio changes
- Doesn't record longer than 30 seconds
- Incorrect BPM readings
- Suddenly changes BPM without variation
- Doesn't work with metronome
- Doesn't work with known dance music tracks (except Tango)
- Doesn't detect beat rate above 240bpm
- Doesn't understand syncopation
Requested features
17 requests- AUv3 support for MIDI rate
- Ability to send MIDI rate to other apps
- Listen to live drummer and sync other apps
- Calculate mean and standard deviation BPM
- Longer time frames on graph
Show 12 moreShow fewer
- More responsive to large tempo changes
- Turn off recording feature by default
- Shazam integration
- Add a sample and tell BPM
- Route BPM info to wireless mixer app
- Visual bar that changes color for tempo deviations
- Built-in metronome
- Option to not record
- Minimize app while using others
- Landscape mode support
- Longer free recording time
- MIDI Timecode or MIDI Clock output
In-app purchases
Transfer Function
- Reference Curves Option$14.99
Tempi
No in-app purchases
Questions
Is Transfer Function free?
Is Tempi free?
Which has better reviews, Transfer Function or Tempi?
Do Transfer Function or Tempi have ads?
Which is updated more often, Transfer Function or Tempi?
Other comparisons
