# Pure Upright vs StringLab

The clearest difference is price: StringLab at $14.99 against Pure Upright's $29.99. StringLab also leads on update cadence (every 10 days vs every 3 months) and iOS requirement (13.0 vs 15.0). Pure Upright's advantage is rating (4.9 vs 4.3) and review sentiment (75% vs 57%). On ads, in-app purchases, monetization model and device support there is nothing between them.

Pure Upright costs $29.99 and StringLab $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Pure Upright holds the better App Store score, 4.9 against 4.3. That said, the two scores are not equally well evidenced: Pure Upright has 75 ratings behind it against 15, so its average is the more settled of the two. Written reviews point the same way: 75% of Pure Upright's written reviews are positive against 57% of StringLab's.

Pure Upright ships an update every 3 months, StringLab every 10 days. The most recent releases landed on October 18, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Pure Upright | StringLab |
| --- | --- | --- |
| Price | $29.99 | **$14.99** |
| Rating | **[4.9 (75 ratings)](https://appshunter.io/ios/app/pure-upright-virtual-piano/id1614870056/reviews)** | [4.3 (15 ratings)](https://appshunter.io/ios/app/stringlab/id6461312318/reviews) |
| Number of ratings | **75** | 15 |
| Positive reviews | **75.0% of reviews** | 57.1% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 10 days** |
| Monetization | Paid | Paid |
| Size | 1.2 GB | 45 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [e-instruments lab GmbH](https://appshunter.io/developer/1336486617) | [4Pockets.com](https://appshunter.io/developer/370131860) |

## What reviewers say

### Pure Upright

[App page](https://appshunter.io/ios/app/pure-upright-virtual-piano/id1614870056)

This app offers a virtual upright piano experience with a unique Morph Pad for blending timbres. It functions as a standalone app or AUv3 plugin and connects to MIDI controllers for professional sound creation.

**Highlights:** Morph Pad for timbre blending, Standalone app and AUv3 plugin, MIDI controller connectivity (USB, Bluetooth), Customizable reverb, EQ, and delay, Sympathetic resonance and key noise, Flexible tuning options, Velocity response customization

**In-app purchases:** none


### StringLab

[App page](https://appshunter.io/ios/app/stringlab/id6461312318)

This app is a digital synthesizer that uses physical string modeling to recreate the sounds of various instruments, particularly plucked or hammered strings. It allows users to explore acoustic physics and create unique instrument textures through extensive parameter experimentation.

**Highlights:** Karplus-Strong physical modeling, Exciter Impact and Noise modes, Resonator objects with feedback, Frequency Dispersion support, External live input, Preset randomizer and manager, Drag & Drop preset export

**In-app purchases:** none


## Frequently asked questions

### Is Pure Upright free?

Pure Upright costs $29.99, with no in-app purchases.

### Is StringLab free?

StringLab costs $14.99, with no in-app purchases.

### Which has better reviews, Pure Upright or StringLab?

Pure Upright is rated higher. Pure Upright averages 4.9 out of 5 from 75 ratings, while StringLab averages 4.3 from 15 ratings.

### Do Pure Upright or StringLab have ads?

Neither Pure Upright nor StringLab shows ads.

### Which is updated more often, Pure Upright or StringLab?

Pure Upright ships an update every 3 months, and StringLab every 10 days. Most recently, Pure Upright was updated on October 18, 2026 and StringLab on October 20, 2026.

---

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