Comparison

Coastline vs FIELD KIT Playback Engine

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Coastline

This app generates unique audio atmospheres and textures for music production. It uses additive and granular synthesis to add depth and character to tracks, offering extensive modulation and a dual-engine sustainer.

Highlights
  • Dual-engine audio sustainer
  • Additive and granular synthesis
  • Custom sample support
  • Intermodulation and advanced filtering
  • Extensive modulation options
  • Cross-platform preset sharing
Features
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Atmosphere machine. Texture generator. Harmonic workstation. A dual-engine audio sustainer with intermodulation, advanced filtering, support for custom samples, and more – all in the service of adding depth and character to your music. Coastline uses a combination of additive and granular synthesis to stretch sounds infinitely. It creates complementary ambience for any sound or composition. It brings a textural “je ne sais quoi” that makes your tracks stand out and feel more alive. Move as quickly as you want: slap it on a track for instant atmosphere, or use it as the recording and processing hub of entire compositions. All recordings happen immediately and automatically – set one volume threshold, and sit back. ENGINES AND EFFECTS • Tide – an additive synthesizer for reimagining sound. Control which frequencies of the input are mapped to oscillators, rebalance them to highlight harmonic or inharmonic characteristics, and introduce new frequencies with waveshaping. • Glade – a granular synthesizer that stretches sound forever with no clicks or transients. Balance the original timbre of your sound against Tide’s distillation of it. • Audio Matrix – route any channel in Coastline to intermodulate another. Create unique harmonic distortions, or load samples to introduce a completely new texture. Includes built-in field samples for naturalistic textures. • Filter – a multi-mode filter for all audio in Coastline, featuring feedback modulation, stereo spread, and independent per-channel controls. • Reverb – a downsampling reverb with a highly configurable chorus section for blending the results of Coastline and introducing another layer of texture and modulation. FEATURES • Modulation – modify any control in Coastline with multiple LFOs, sequencers, smooth random sources, and performance effects. • Presets – full preset control over every parameter in Coastline. Cross-platform preset format for sharing with friends. • Waymaker – connect to Coastline’s sibling application, Waymaker, for sequencing and additional control over the pitch of Coastline’s output. Includes 20+ presets by Peter Bark and imago meri. Also available for macOS and Windows in VST3 / AU / AAX formats from Aqeel Aadam Sound.

About

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.

Highlights
  • 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
Currently charting
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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.

Screenshots

Coastline1 screens
FIELD KIT Playback Engine4 screens

Verdict

The call

The clearest difference is rating: Coastline at 5.0 against FIELD KIT Playback Engine's 4.6. Coastline also leads on review sentiment (100% vs 80%) and iOS requirement (13.0 vs 15.0). FIELD KIT Playback Engine's advantage is price ($9.99 vs $14.99) and chart position (#180 vs unranked). On ratings volume, ads, in-app purchases and monetization model 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

CostPrice · In-app purchases · Ads · Monetization

Coastline costs $14.99 and FIELD KIT Playback Engine $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Coastline holds the better App Store score, 5.0 against 4.6. Both are backed by a comparable volume of ratings — 12 and 5 respectively. Written reviews point the same way: 100% of Coastline's written reviews are positive against 80% of FIELD KIT Playback Engine's.

UpkeepUpdate frequency

Coastline ships an update every 3 weeks, FIELD KIT Playback Engine every 2 weeks. The most recent releases landed on October 24, 2026 and October 26, 2026 respectively.

Scorecard6 real differences · 5 level
Coastline versus FIELD KIT Playback Engine: the parameters behind the verdict, then further details
ParameterCoastlineFIELD KIT Playback Engine
Price$14.99$9.99 — better
Rating5.0 (12 ratings) — better4.6 (5 ratings)
Positive reviews100.0% of reviews — better80.0% of reviews
Number of ratings12 — better5
Update frequencyEvery 3 weeksEvery 2 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
Best chart rank—#180 — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better15.0
Further details — not scored
Size71 MB12 MB
Age rating4+4+
DeveloperAqeel AadamField Tone Audio, LLC

Customer experience

Coastline

All ratings12 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

FIELD KIT Playback Engine

All ratings4 ratings
Positive75.0%
Neutral25.0%
Negative0.0%
Written reviews5 reviews
Positive80.0%
Neutral20.0%
Negative0.0%

In-app purchases

None

Coastline

No in-app purchases

None

FIELD KIT Playback Engine

No in-app purchases

Questions

Is Coastline free?
Coastline costs $14.99, with no in-app purchases.
Is FIELD KIT Playback Engine free?
FIELD KIT Playback Engine costs $9.99, with no in-app purchases.
Which has better reviews, Coastline or FIELD KIT Playback Engine?
Coastline is rated higher. Coastline averages 5.0 out of 5 from 12 ratings, while FIELD KIT Playback Engine averages 4.6 from 5 ratings.
Do Coastline or FIELD KIT Playback Engine have ads?
Neither Coastline nor FIELD KIT Playback Engine shows ads.
Which is updated more often, Coastline or FIELD KIT Playback Engine?
Coastline ships an update every 3 weeks, and FIELD KIT Playback Engine every 2 weeks. Most recently, Coastline was updated on October 24, 2026 and FIELD KIT Playback Engine on October 26, 2026.

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