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Focusrite Scarlett 18i20 4th Gen USB Audio Interface vs Universal Audio Apollo Solo Heritage Edition, APLS-HE

Updated August 2026 — Focusrite Scarlett 18i20 4th Gen USB Audio Interface leads on software bundle and audio quality.

The Focusrite Scarlett 18i20 offers extensive connectivity and a comprehensive software bundle, while the Universal Audio Apollo Solo excels in sound quality and portability.

Why Focusrite Scarlett 18i20 4th Gen USB Audio Interface is better

Connectivity

Scarlett 18i20 has 18 inputs and 20 outputs.

Software

Includes a comprehensive suite of recording software.

Workflow Tools

Features Auto Gain and Clip Safe for optimal recording.

Why Universal Audio Apollo Solo Heritage Edition, APLS-HE is better

Sound Quality

Apollo Solo has superior audio conversion.

Portability

Compact design and bus-powered for easy transport.

Plug-ins

Bundled with a premium suite of award-winning plug-ins.

Overall score

Focusrite Scarlett 18i20 4th Gen USB Audio Interface
85
Universal Audio Apollo Solo Heritage Edition, APLS-HE
75

Specifications

SpecFocusrite Scarlett 18i20 4th Gen USB Audio InterfaceUniversal Audio Apollo Solo Heritage Edition, APLS-HE
Audio Quality24-bit, 192kHzClass-leading conversion
Mic Preamps82
Dynamic Range122dBNot specified
LatencyLowNear-zero
CompatibilityAll DAWsMac only for LUNA

Dimension comparison

Focusrite Scarlett 18i20 4th Gen USB Audio InterfaceUniversal Audio Apollo Solo Heritage Edition, APLS-HE

Overview of the Focusrite Scarlett 18i20 and Universal Audio Apollo Solo

The Focusrite Scarlett 18i20 is priced at $749.99, while the Universal Audio Apollo Solo Heritage Edition is more budget-friendly at $599.00, making it about 17% cheaper. Both audio interfaces cater to different needs in music production, podcasting, and other audio applications, appealing to a wide range of users from amateur to professional.

The Scarlett 18i20 features a robust setup with 18 inputs and 20 outputs, including eight microphone preamps, making it ideal for complex recording sessions. In contrast, the Apollo Solo offers a more compact option with a focus on premium sound quality and bundled software, emphasizing ease of use and portability.

Build Quality and Design

When it comes to build quality, both interfaces present a professional appearance, but they serve slightly different purposes. The Focusrite Scarlett 18i20 is designed for larger setups with its extensive input/output options, which makes it a suitable choice for project studios that require multiple connections. Its sturdy build reflects its professional application, ensuring it can withstand the rigors of frequent use.

On the other hand, the Universal Audio Apollo Solo is more compact and portable, designed for mobile recording situations. Its bus-powered connection allows for easy setup with Mac and Windows systems, reducing cable clutter. The Apollo Solo's premium build quality is evident, making it an appealing choice for creators who prioritize both aesthetics and durability in their equipment.

Audio Quality

Audio quality is a crucial factor when selecting an audio interface, and both the Focusrite Scarlett 18i20 and Universal Audio Apollo Solo excel in this area. The Scarlett 18i20 boasts 24-bit, 192kHz converters from Focusrite’s flagship RedNet range, offering a dynamic range of 122dB, which ensures detailed recordings suitable for high-fidelity music production.

In comparison, the Apollo Solo is known for its class-leading audio conversion, which delivers superior sound quality. It includes two Unison mic preamps that emulate renowned brands, providing users with vintage sound characteristics that are highly sought after in professional audio. Both interfaces offer excellent audio performance, but the choice may ultimately depend on the specific needs of the user regarding sound character and application.

Features and Software

The Focusrite Scarlett 18i20 comes equipped with a comprehensive suite of software, including Pro Tools Intro+, Ableton Live Lite, and Cubase LE, along with Hitmaker Expansion, which features essential effects and powerful software instruments. This extensive package caters to users looking for an all-in-one solution for their recording needs.

In contrast, the Universal Audio Apollo Solo Heritage Edition offers a premium suite of five award-winning plug-ins valued at over $1,300. These include renowned titles from Teletronix and Pultec, enhancing the recording experience by allowing real-time tracking through vintage compressors and EQs. Users of the Apollo Solo also benefit from the LUNA Recording System, a fully integrated recording application, although it is Mac only. The software offerings of both interfaces are impressive, but the Apollo Solo stands out for its plug-in package and compatibility with UA’s software ecosystem.

Input and Output Options

The input and output capabilities of both interfaces are tailored to different user needs. The Focusrite Scarlett 18i20 features an impressive array with 18 inputs and 20 outputs, including eight mic preamps, Hi-Z, line inputs, ADAT, S/PDIF, MIDI I/O, and Word Clock. This extensive connectivity makes it an excellent choice for those who need to manage complex recording setups or connect multiple instruments and devices seamlessly.

Conversely, the Universal Audio Apollo Solo offers a more streamlined setup with a total of 2 inputs and 4 outputs, which is sufficient for solo artists or smaller projects. While it may not match the Scarlett’s extensive options, its Unison technology allows users to simulate high-end preamps directly within their DAW, offering significant flexibility despite its more limited physical connections. The choice between these interfaces will depend largely on the scale and complexity of the user’s recording needs.

Monitoring and Workflow Tools

Monitoring capabilities are critical for any audio interface, and both the Focusrite Scarlett 18i20 and Universal Audio Apollo Solo provide excellent options. The Scarlett 18i20 includes professional workflow tools like Auto Gain and Clip Safe, which help to set optimal levels quickly and prevent clipping during recording. These features make it easier for users to focus on performance rather than technical adjustments.

The Apollo Solo, meanwhile, features a best-in-class headphone amplifier for detailed, low-noise monitoring, ensuring that users can hear their recordings clearly. Its near-zero latency tracking through UAD processing allows for a smoother workflow, particularly when using plug-ins in real-time. Both interfaces cater to monitoring needs effectively, but the Scarlett’s additional workflow tools may appeal more to those involved in complex recording sessions.

Target Audience

Each audio interface is designed with different target audiences in mind. The Focusrite Scarlett 18i20 is ideal for larger studios or project studios that require extensive I/O options and flexibility in their setups. Its high-quality preamps and robust features make it suitable for musicians, producers, and podcasters looking to capture high-fidelity recordings.

On the other hand, the Universal Audio Apollo Solo Heritage Edition is tailored for solo artists or small project setups who value high-quality audio and premium plug-ins. Its portability and ease of use make it an excellent choice for musicians on the go or those who primarily work in a home studio environment. The decision between these two interfaces will largely depend on the user's specific recording requirements and workflow preferences.

Which should you buy?

In conclusion, choosing between the Focusrite Scarlett 18i20 and the Universal Audio Apollo Solo Heritage Edition ultimately hinges on your individual needs and recording style. If you require extensive connectivity options and a comprehensive software bundle, the Scarlett 18i20, priced at $749.99, is an excellent choice. However, if you prioritize high-quality sound and a premium plug-in suite while being more cost-effective at $599.00, the Apollo Solo is likely the better option. Both interfaces offer professional-level audio quality, but their differing features will cater to specific user scenarios.