# Stringcalculator vs Helium AUv3 MIDI Sequencer

The clearest difference is update cadence: Helium AUv3 MIDI Sequencer at fortnightly against Stringcalculator's every 16 months. Helium AUv3 MIDI Sequencer also leads on iOS requirement (13.0 vs 17.6). Stringcalculator's advantage is review sentiment (100% vs 75%) and price ($2.99 vs $7.99). On ads, in-app purchases, monetization model and device support there is nothing between them.

Stringcalculator costs $2.99 and Helium AUv3 MIDI Sequencer $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Stringcalculator ships an update every 16 months, Helium AUv3 MIDI Sequencer fortnightly. The most recent releases landed on October 15, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Stringcalculator | Helium AUv3 MIDI Sequencer |
| --- | --- | --- |
| Price | **$2.99** | $7.99 |
| Rating | — | **[4.3 (55 ratings)](https://appshunter.io/ios/app/helium-auv3-midi-sequencer/id1563152523/reviews)** |
| Number of ratings | — | **55** |
| Positive reviews | **100.0% of reviews** | 74.5% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 16 months | **Fortnightly** |
| Monetization | Paid | Paid |
| Size | 1 MB | 84 MB |
| Requires iOS | 17.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Martin Uhlig](https://appshunter.io/developer/1414861205) | [4Pockets.com](https://appshunter.io/developer/370131860) |

## What reviewers say

### Stringcalculator

[App page](https://appshunter.io/ios/app/stringcalculator/id1426367350)

Calculate string properties for various instruments. Determine diameter, tension, and tone based on material, frequency, and scale length. Supports multiple units of measurement.

**Highlights:** Calculate string diameter, tension, and tone, Supports gut, nylgut, carbon, Tynex, and nylon strings, Set custom frequencies, Calculate in cm, mm, or inches, Adjustable scale length

**Features:** macOS Compatibility

**In-app purchases:** none


### Helium AUv3 MIDI Sequencer

[App page](https://appshunter.io/ios/app/helium-auv3-midi-sequencer/id1563152523)

This app is a powerful MIDI sequencer designed for music production. It allows users to create and arrange complex musical pieces with multiple tracks, extensive clip libraries, and advanced looping features. Easily organize and import MIDI data to build songs efficiently.

**Highlights:** 16 Tracks per instance, Over 7000 MIDI clips library, Media Bay for organizing clips, Remote Looping functionality, Song Mode for arranging sections, Full CC controller editing, Sync to Host

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 👍 Powerful MIDI sequencer
- 💡 Innovative features
- 🚀 Smooth workflow
- 👍 Great value for price
- 💡 Intuitive piano roll

**What reviewers complain about**

- 🐛 Randomization goes extreme
- 🐛 MIDI out channels not visible in AUM
- 🐛 App crashes frequently
- 🐛 Notes get stuck
- 🐛 Randomization causes crashes

**Reported bugs**

- Notes get stuck
- Randomization causes crashes
- MIDI out channels not visible in AUM
- App crashes frequently
- MIDI import mixes tracks

**Requested features**

- Scale key and random velocity
- Arpeggios patterns
- More gradual randomization approach
- Scissor tool for shortening MIDI events
- Latch option for press/hold to audition MIDI sequences


## Frequently asked questions

### Is Stringcalculator free?

Stringcalculator costs $2.99, with no in-app purchases.

### Is Helium AUv3 MIDI Sequencer free?

Helium AUv3 MIDI Sequencer costs $7.99, with no in-app purchases.

### Do Stringcalculator or Helium AUv3 MIDI Sequencer have ads?

Neither Stringcalculator nor Helium AUv3 MIDI Sequencer shows ads.

### Which is updated more often, Stringcalculator or Helium AUv3 MIDI Sequencer?

Stringcalculator ships an update every 16 months, and Helium AUv3 MIDI Sequencer fortnightly. Most recently, Stringcalculator was updated on October 15, 2026 and Helium AUv3 MIDI Sequencer on October 20, 2026.

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