Comparison

Surround Speaker Check vs Flow

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

Head to head
About

Surround Speaker Check

Test and optimize your Dolby Atmos home theater system. This app provides over two hours of spatial audio content to verify surround sound decoding, speaker configuration, and enjoy immersive audio experiences on compatible soundbars and headphones.

Highlights
  • Verify Dolby Atmos decoding
  • Test speaker configuration
  • Evaluate height channels
  • Subwoofer test suite
  • Manual speaker troubleshooting
  • Spatial audio demos
  • Dolby Atmos test tracks
Features
Read full description

Surround Speaker Check is a fun and entertaining utility to help you set up and enjoy Dolby Atmos on your home theater gear! Also works as great way to test spatial audio on Dolby Atmos-compatible sound bars and headphones! Surround Speaker Check is more than just the world’s most popular AV utility app - with over 2 hours of content, it’s now THE best way to experience Dolby Atmos spatial audio like you’ve never heard before! SURROUND SOUND TESTING - Verify your system is properly decoding Dolby Atmos surround sound audio - Confirm your speakers are properly configured - Hear and evaluate your surround speakers in isolation (including height channels) - Tune your room, test your sub with the new Subwoofer Test Suite - Use the Manual Speaker Check feature to help troubleshoot and fine-tune your system - Confirm your Apple TV is properly set-up for surround sound playback DOLBY ATMOS TEST TRACKS - True Dolby Atmos audio support provides an accurate and complete test environment - Supports up to 7.1.4 speaker layouts - Works with Atmos-compatible soundbars SPATIAL AUDIO PLAYGROUND - Over two hours of spatial audio demos and Dolby Atmos test tracks - Regularly updated Dolby Atmos demos experimental spatial audio content - Enjoy spatial object scenes designed to unleash the full potential of your home theater Uses specially-produced Dolby Atmos surround tracks with on-screen 3D graphics Designed by guitarist and immersive audio producer Jeff Perrin as a means to confirm the integrity of various surround systems while producing surround sound music tracks. NOTE: Playback of test content on speakers requires an Apple TV (or similar AirPlay-compatible streaming device) connected to a Dolby Digital-compatible home theater system. Spatial audio support over headphones requires compatible iOS device with Dolby Atmos-compatible AirPods or Dolby Atmos-compatible headphones. When played back over an optical connection or non-Atmos devices, surround content will fold down to Dolby Digital 5.1 or stereo 2.0 format, depending on device capabilities. In all cases, a fast internet connection is highly recommend. *Playback of Dolby Atmos content on non-Apple devices requires that the device supports multichannel audio (ie. Dolby Digital 5.1 or Atmos) over AirPlay 2. Please check your device specifications. Please try out the free included test tracks so as to ensure compatibility with your hardware before making any purchases. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Flow

Features
Read full description

Flow turns your iPhone and iPad into a powerful sensor hub. Build visual data pipelines by connecting nodes on a canvas — stream camera, motion, and AR data to any device over OSC, UDP, or TCP. VISUAL NODE EDITOR Drag, connect, and configure nodes on an interactive canvas. No coding required. Build complex sensor routing in minutes with an intuitive drag-and-connect interface inspired by tools like TouchDesigner and Max/MSP. 50+ NODES IN 3 CATEGORIES Sources — Camera & Vision (body pose, hand tracking, face landmarks), Sensors (accelerometer, gyroscope, magnetometer, barometer, ARKit), Generators (signal, noise, counter, timer, clock, array sequencer), and Data (API request with JSON extraction). Processing — Math operations, trigonometry, normalize, quantize, smooth filters, map range, waveform modulation, oscillators, logic gates, comparators, thresholds, triggers, delay, sample & hold, looper, vector math, string formatting, and JSON building. Destinations — TCP client & server, UDP sender, OSC sender. Plus multi-device nodes that broadcast to sequential IP addresses with per-device value offsets — perfect for LED installations, coordinated displays, and multi-device performances. REAL-TIME LIVE DATA Monitor every node in real time. Source nodes show output data, processing nodes show both input and processed output, destination nodes show what they receive. Human-readable formatting for all data types — JSON pretty-printing, pose joint details with confidence bars, hex blob previews, matrix grids, and sparkline history charts. MULTI-DEVICE ORCHESTRATION Control multiple devices simultaneously. Set a base IP and device count — Flow sends to each device with optional per-device value offsets. Create wave effects, staggered animations, or synchronized installations across OSC, UDP, or TCP. API INTEGRATION Fetch data from any REST API with configurable HTTP method, headers, and request body. Extract values from JSON responses using dot-notation key paths. Auto-fetch on intervals or trigger manually. 30+ READY-MADE TEMPLATES Start instantly with pre-built workflows for hand tracking, body pose, face landmarks, accelerometer streaming, ARKit world tracking, noise generation, signal processing chains, multi-device broadcasting, and more. CAMERA PREVIEW Live camera feed appears automatically on the canvas when running vision pipelines. See your pose tracking, hand detection, or face landmarks overlaid in real time. SAVE & REUSE Save workflows and destination presets. Quickly switch between network configurations. Load saved workflows from the template picker. BUILT FOR CREATIVE TECHNOLOGISTS Flow is designed for artists, VJs, installation designers, creative coders, and anyone who needs to get sensor data from iOS to other software or hardware. Works seamlessly with TouchDesigner, Max/MSP, Processing, openFrameworks, Unity, Unreal Engine, Resolume, and any OSC/UDP/TCP-compatible tool. TECHNICAL HIGHLIGHTS • iOS 17+ with SwiftUI and Swift Concurrency • 60fps pipeline engine with actor-based architecture • Network.framework for low-latency TCP/UDP • Full OSC 1.0 protocol support • Vision framework for real-time pose estimation • CoreMotion for all device sensors • ARKit for world and face tracking

Screenshots

Surround Speaker Check4 screens
Flow4 screens

Verdict

The call

The clearest difference is price: Surround Speaker Check at Free against Flow's $4.99. Flow's advantage is in-app purchases (none vs 4) and update cadence (every 5 weeks vs every 5 months). On ads, device support and iOS requirement 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

Surround Speaker Check is free to download; Flow costs $4.99 up front. Surround Speaker Check sells 4 in-app purchases, starting at $19.99 per year. Flow asks for nothing beyond the download.

UpkeepUpdate frequency

Surround Speaker Check ships an update every 5 months, Flow every 5 weeks. The most recent releases landed on October 14, 2026 and October 17, 2026 respectively.

Scorecard3 real differences · 7 level
Surround Speaker Check versus Flow: the parameters behind the verdict, then further details
ParameterSurround Speaker CheckFlow
PriceFree — better$4.99
Rating3.8 (41 ratings) — better—
Positive reviews54.3% of reviews—
Number of ratings41 — better—
Update frequencyEvery 5 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, Apple TV — betteriPhone, iPad
Requires iOS16.6 — better17.0
Further details — not scored
Size180 MB4 MB
Age rating4+12+
DeveloperJeff Perrin Music LLCIbrahim Sefa Tuna

In-app purchases

4 purchases

Surround Speaker Check

Subscriptions2
  • Unlimited Access$19.991 Year
  • Unlimited Access$24.991 Year
One-time2
  • Subwoofer Check$0.99
  • Center Speaker Check$0.99
None

Flow

No in-app purchases

Questions

Is Surround Speaker Check free?
Surround Speaker Check is free to download, with in-app purchases available.
Is Flow free?
Flow costs $4.99, with no in-app purchases.
Do Surround Speaker Check or Flow have ads?
Neither Surround Speaker Check nor Flow shows ads.
Which is updated more often, Surround Speaker Check or Flow?
Surround Speaker Check ships an update every 5 months, and Flow every 5 weeks. Most recently, Surround Speaker Check was updated on October 14, 2026 and Flow on October 17, 2026.

Other comparisons