Theremin Synth vs Multi
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Theremin Synth
Create unique soundscapes with this multitouch synthesizer. Record, loop, and overdub your creations, then export them as WAV files to share. Experiment with various waveforms and effects for endless sonic possibilities.
- Multitouch synthesis
- Record, loop, and overdub
- Adjustable delay, feedback, and scuzz effects
- Four waveform options
- Export recordings as WAV files
- Offline functionality
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This is a multitouch synth instrument. Play it by touching and swiping the screen, changing the waveforms and sliding the effects to create anything from traditional sci-fi theremin sounds to deep scuzzy soundscapes. Use the looper controls to record, loop and overdub layers. Then if you wish to save or share your recording, hit the download button to send your wav file to other compatible apps like Messages, Email, Dropbox etc. The original Theremin went live in 2014 on the web at femurdesign.com/theremin. Over a million hits later and hundreds of requests for a record button, I have redesigned it. Now the Theremin is ready for you to experiment with. Happy playing! -- SPECIFICATIONS -- • Record, loop and overdub options. • Multitouch allows up to 8 tones to be played simultaneously with your fingers • 3 sliders: delay, feedback and scuzz • 4 waveforms: sine, square, triangle and saw • No internet needed, works both online and offline • Download the loop as a .wav file • Loops can be shared with other apps like Mail, Message and more. • 1000+ installs • Compatible with iOS versions 8 - 10 • Optimized for iPhone, iPad & iPad Pro -- REVIEWS -- Gizmodo "Just mess around! Twiddle those faders! Swipe and click with reckless abandon! Turn the volume all the way up, give the dog a panic fit, and make your neighbours think the street's being invaded by giant cabbage people from planet Zok. Trust me, this will never get old.” Dangerous Minds “New online theremin simulator kind of sounds cooler than the real thing. Check it out and annoy your co-workers.” Mashable “Messing around with this virtual theremin is completely addicting” -- CONTACT -- To find out about my other musical app projects, please go to femurdesign.com and share your loops with me on Facebook and Twitter. Facebook: facebook.com/femurdesign Twitter: @femurdesign For any queries and support contact me here: femurdesign.com/support
Multi
This audio compressor plugin offers multi-band processing for precise control over different frequency ranges. It features a modern interface with stereo meters and adjustable parameters for each of the four bands, ideal for detailed audio mixing.
- Multi-band compression with 4 bands
- Adjustable threshold, ratio, gain, attack, release per band
- Automatic gain (make-up) mode
- Frequency domain splitting with crossover controls
- Gate and peak lights for each band
- Mute specific frequency bands
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This is a AUv3 compatible audio compressor which can be used as plugin with your favourite DAW such as Cubasis, Meteor, Auria or GarageBand. It supports a modern graphical interface and presets with stereo meters for monitoring signal levels. An audio compressor is used to reduce the volume levels of loud sounds above a specified threshold and amplify quiet parts thus reducing an audio signals dynamic range. The dynamic volume changes of a recording means that the overall level of the compressed recording can be increased inside your mix. The recording will also sit inside your whole mix much more easily. There are times when you need to apply different amounts of compression to specific frequency bands such as when compressing drums. In these cases you can isolate say the kick drum and the snare, providing a boost to the kick, while suppressing the snare. This multi band compressor allows you to define 4 bands, with separate threshold, ratio, gain, attack and release times for each. We also provide an automatic gain mode, often referred to as make-up which automatically boosts the signal as you decrease the threshold. Once the compressor gate is triggered simply adjust the gain to suite. This effect effectively splits the frequency domain into 4 bands using 3 crossover controls. We provide gate and peak lights for all four compression bands as well as allowing you to mute specific bands which might be useful if you are wanting to remove a frequency range from the mix. This is one of a suite of AUv3 compatible plugins which will also soon be available from 4Pockets.
Screenshots
Verdict
Theremin Synth and Multi both sit at 3.2 stars, but that hides the real split: 64% of Theremin Synth's written reviews are positive against 50% of Multi's. Theremin Synth also leads on price ($2.99 vs $5.99). On rating, ratings volume, update cadence and ads 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
Theremin Synth costs $2.99 and Multi $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Multi holds the better App Store score, 3.3 against 3.2. Both are backed by a comparable volume of ratings — 6 and 3 respectively. Written reviews complicate that: 64% of Theremin Synth's written reviews are positive against 50% of Multi's, so the app with the better star average is not the one people write more warmly about.
Both ship on a similar rhythm, roughly every 2 months. Both last shipped on October 24, 2026.
| Parameter | Theremin Synth | Multi |
|---|---|---|
| Price | $2.99 — better | $5.99 |
| Rating | 3.2 (6 ratings) | 3.3 (3 ratings) — better |
| Positive reviews | 63.6% of reviews — better | 50.0% of reviews |
| Number of ratings | 6 — better | 3 |
| Update frequency | Every 2 months | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.1 — better | 13 |
| Further details — not scored | ||
| Size | 1 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Luke Phillips | 4Pockets.com |
Customer experience
Theremin Synth
Multi
In-app purchases
Theremin Synth
No in-app purchases
Multi
No in-app purchases









