# Transfer Function vs Tempi

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.

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.

## The numbers

| Metric | Transfer Function | Tempi |
| --- | --- | --- |
| Price | $49.99 | **$6.99** |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/transfer-function/id824037130/reviews) | **[4.7 (337 ratings)](https://appshunter.io/ios/app/tempi-bpm-and-beat-tracking/id1257590915/reviews)** |
| Number of ratings | 2 | **337** |
| Positive reviews | 25.0% of reviews | **72.1% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 months** |
| Monetization | Paid | **Free** |
| Best chart rank | — | **#171** |
| Size | 34 MB | 8 MB |
| Requires iOS | **15.0** | 16.2 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Andrew Smith](https://appshunter.io/developer/291822462) | [Made by Windmill, LLC](https://appshunter.io/developer/1257590914) |

## What reviewers say

### Transfer Function

[App page](https://appshunter.io/ios/app/transfer-function/id824037130)

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.

**Highlights:** Dual-FFT acoustic analysis, Magnitude, Phase, Coherence graphs, Delay Finder, Signal Generator, Music as signal source, Internal microphone support, Two-channel audio interface compatibility

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Reference Curves Option | $14.99 | one-time |


### Tempi

[App page](https://appshunter.io/ios/app/tempi-bpm-and-beat-tracking/id1257590915)

**Currently charting:** #171 Top Paid · Music (US App Store)

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.

**Highlights:** Real-time BPM detection, Live tempo analysis, Post-performance recording analysis, Tap for tempo functionality, Save and export recordings, Nighttime theme option

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Accurate tempo detection
- 👍 Helpful for musicians
- 👍 Easy to use
- 👍 Great for practice
- 👍 Useful for live gigs

**What reviewers complain about**

- 🐛 Inaccurate tempo readings
- 🐛 Freezes up
- 🐛 Loses track of BPM
- 🐛 Doesn't work with other apps
- 🐛 Records only short durations

**Reported bugs**

- 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

**Requested features**

- 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


## Frequently asked questions

### Is Transfer Function free?

Transfer Function costs $49.99, and also offers in-app purchases.

### Is Tempi free?

Tempi costs $6.99, with no in-app purchases.

### Which has better reviews, Transfer Function or Tempi?

Tempi is rated higher. Transfer Function averages 3.0 out of 5 from 2 ratings, while Tempi averages 4.7 from 337 ratings.

### Do Transfer Function or Tempi have ads?

Neither Transfer Function nor Tempi shows ads.

### Which is updated more often, Transfer Function or Tempi?

Transfer Function ships an update every 6 months, and Tempi every 3 months. Most recently, Transfer Function was updated on October 24, 2026 and Tempi on October 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*