# OB vs L12X Solid State Amplifier

The clearest difference is price: L12X Solid State Amplifier at Free against OB's $19.99. L12X Solid State Amplifier also leads on rating (4.4 vs 4.2). OB's advantage is review sentiment (75% vs 50%). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.

L12X Solid State Amplifier is free to download; OB costs $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

L12X Solid State Amplifier holds the better App Store score, 4.4 against 4.2. Both are backed by a comparable volume of ratings — 16 and 9 respectively. Written reviews complicate that: 75% of OB's written reviews are positive against 50% of L12X Solid State Amplifier's, so the app with the better star average is not the one people write more warmly about.

OB ships an update every 10 days, L12X Solid State Amplifier weekly. The most recent releases landed on September 20, 2026 and August 25, 2026 respectively.

## The numbers

| Metric | OB | L12X Solid State Amplifier |
| --- | --- | --- |
| Price | $19.99 | **Free** |
| Rating | [4.2 (16 ratings)](https://appshunter.io/ios/app/ob-xd-3-auv3-synth/id6654915211/reviews) | **[4.4 (9 ratings)](https://appshunter.io/ios/app/l12x-solid-state-amplifier/id6746237638/reviews)** |
| Number of ratings | **16** | 9 |
| Positive reviews | **75.0% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 days | **Weekly** |
| Monetization | Paid | **Free** |
| Size | 210 MB | 30 MB |
| Requires iOS | 15.0 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [DiscoDSP LLC](https://appshunter.io/developer/1465262828) | [Audiority Srl](https://appshunter.io/developer/1815900942) |

## What reviewers say

### OB

[App page](https://appshunter.io/ios/app/ob-xd-3-auv3-synth/id6654915211)

This app recreates a classic vintage synthesizer, offering rich, full-bodied tones for electronic music, recordings, and film scores. It features MPE support, an on-screen MIDI keyboard, and high-quality rendering for enhanced music production.

**Highlights:** Oberheim OB-X emulation, MPE support, On-screen MIDI keyboard, High-quality retina rendering, AUv3 improvements, Preset search with categories

**In-app purchases:** none


### L12X Solid State Amplifier

[App page](https://appshunter.io/ios/app/l12x-solid-state-amplifier/id6746237638)

This app offers an analog simulation of a classic solid-state guitar amplifier, enhanced with extra channels and a contour knob for versatile tone shaping. It includes an integrated cabinet simulator with a high-quality impulse response for authentic sound.

**Highlights:** Analog simulation of Marshall Lead 12, Clean and Metal channels, Contour knob for tone shaping, Boost overdrive stage, Integrated Cab Simulator, Marshall cabinet IR with Celestion V30

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is OB free?

OB costs $19.99, with no in-app purchases.

### Is L12X Solid State Amplifier free?

L12X Solid State Amplifier is free to download, with no in-app purchases.

### Which has better reviews, OB or L12X Solid State Amplifier?

L12X Solid State Amplifier is rated higher. OB averages 4.2 out of 5 from 16 ratings, while L12X Solid State Amplifier averages 4.4 from 9 ratings.

### Do OB or L12X Solid State Amplifier have ads?

Neither OB nor L12X Solid State Amplifier shows ads.

### Which is updated more often, OB or L12X Solid State Amplifier?

OB ships an update every 10 days, and L12X Solid State Amplifier weekly. Most recently, OB was updated on September 20, 2026 and L12X Solid State Amplifier on August 25, 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.*