FIELD KIT Playback Engine vs Porthole Audio
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FIELD KIT Playback Engine
Transform audio recordings into evolving textures, rhythms, and atmospheres. Create up to four independent playback windows with customizable speed, direction, and effects. Explore new sonic material from your recordings.
- Up to four independent playback windows
- Variable playback speed and direction
- Drive and filtering per window
- Routable modulation sources
- Save and recall .fieldkit files
- Standalone app and AUv3 Audio Unit
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FIELD KIT is an audio playback instrument built for turning recorded sound into evolving texture, rhythm, and atmosphere. Load an audio file and create up to four independent playback windows across the recording. Each window can move through a different section of the source with its own playback speed, direction, crossfade, drive, filtering, level, and pan. Use FIELD KIT to pull overlapping textures from long field recordings, transform environmental sound into ambient beds, create asynchronous loops, or find entirely new material hidden inside a recording. Three modulation sources can be routed independently across the playback windows, allowing parameters to drift, pulse, and evolve over time. Features include: - Up to four independent playback windows - Forward, reverse, and ping-pong playback - Variable playback speed - Adjustable loop crossfade - Drive and filtering per window - Independent level and pan controls - Three routable modulation sources - SPLICE for working with multiple audio sources - Save and recall .fieldkit files to share across platforms - Internal recording in Standalone mode - Standalone app and AUv3 Audio Unit - Host transport support in compatible AUv3 hosts FIELD KIT was designed around a simple idea: a recording doesn't have to be played from beginning to end. It can be a place to explore.
Porthole Audio
This app captures system audio from your device and routes it into audio plug-ins. It allows you to host AUv3 plug-ins and use the app itself as an instrument within other music applications.
- Capture system audio
- Route audio to plug-ins
- Host AUv3 plug-ins
- Use as an AUv3 instrument
- Cross-app audio capture
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Porthole captures audio from other apps and sends it directly to AUv3 samplers. No screen recordings, video trimming, or file transfers required. AUv3 Hosting Open a compatible sampler inside Porthole and capture audio directly into it. AUv3 Instrument Load Porthole in AUM, Loopy Pro, GarageBand, or another compatible host. Direct Audio Capture Record audio playing in other apps without creating video files or extracting audio afterward.
Screenshots
Verdict
The clearest difference is review sentiment: FIELD KIT Playback Engine at 80% against Porthole Audio's 50%. FIELD KIT Playback Engine also leads on iOS requirement (15.0 vs 27.0). Porthole Audio's advantage is rating (5.0 vs 4.6) and price ($4.99 vs $9.99). On ratings volume, update cadence, ads and in-app purchases 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
FIELD KIT Playback Engine costs $9.99 and Porthole Audio $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Porthole Audio holds the better App Store score, 5.0 against 4.6. Both are backed by a comparable volume of ratings — 5 and 4 respectively. Written reviews complicate that: 80% of FIELD KIT Playback Engine's written reviews are positive against 50% of Porthole Audio's, so the app with the better star average is not the one people write more warmly about.
FIELD KIT Playback Engine ships an update every 2 weeks, Porthole Audio every 11 days. Both last shipped on November 6, 2026.
| Parameter | FIELD KIT Playback Engine | Porthole Audio |
|---|---|---|
| Price | $9.99 | $4.99 — better |
| Rating | 4.6 (5 ratings) | 5.0 (4 ratings) — better |
| Positive reviews | 80.0% of reviews — better | 50.0% of reviews |
| Number of ratings | 5 — better | 4 |
| Update frequency | Every 2 weeks | Every 11 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Best chart rank | #167 | #139 — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 27.0 |
| Further details — not scored | ||
| Size | 12 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | Field Tone Audio, LLC | Feras Alnatsheh |
Customer experience
FIELD KIT Playback Engine
Porthole Audio
In-app purchases
FIELD KIT Playback Engine
No in-app purchases
Porthole Audio
No in-app purchases
Questions
Is FIELD KIT Playback Engine free?
Is Porthole Audio free?
Which has better reviews, FIELD KIT Playback Engine or Porthole Audio?
Do FIELD KIT Playback Engine or Porthole Audio have ads?
Which is updated more often, FIELD KIT Playback Engine or Porthole Audio?
Which is more popular, FIELD KIT Playback Engine or Porthole Audio?
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