Comparison

NDI Test Patterns vs TopDirector (NDI,SRT,UVC,RTSP)

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

Head to head
About

NDI Test Patterns

Transform your mobile device into a professional NDI® test pattern generator. Send video and audio test signals, or create custom slideshows using your own images. Ideal for live video production workflows.

Highlights
  • Mobile NDI test pattern source
  • Audio test tone generation
  • Custom NDI slideshows
  • High-resolution photo support
  • Automatic NDI device recognition
  • iPhone and iPad compatible
Features
Read full description

The official NDI® Test Patterns application. Turn your phone or tablet into a test pattern source for any NDI® receiver. The app also supports the sending of an audio test tone at different standard volumes which is useful when checking receiver audio levels. Finally enjoy the ability to add pictures from your photo library enabling custom NDI® slide shows. NDI® (Network Device Interface) is a low latency IP video protocol developed especially for professional live video production, and is supported by an extensive list of broadcast systems from many manufacturers. NDI® HX Camera turns your iOS imaging devices into high-quality wireless a/v sources for NDI-enabled broadcast systems and software on the same network. Your device’s output is automatically recognized by NDI-enabled* video systems, ready to be mixed into live shows or even for use as a web camera when used in conjunction with NDI® Tools (ndi.tv/tools). * Note: Requires support for NDI v.4 or better. Basic Features • Easy to use • iPhone and iPad compatibility • Access your photo library to stream user photos over NDI • Multiple standard volume choices for the audio test tone Advanced Features • Support for high resolution photos • Automatic NDI device recognition Support • Knowledge Base Articles https://support.newtek.com/hc/en-us/search?utf8=%E2%9C%93&query=iphone&commit=Search • NDI Forums https://forums.newtek.com/forumdisplay.php/360-NDI-%28Network-Device-Interface%29

About

TopDirector (NDI,SRT,UVC,RTSP)

This app allows users to switch between multiple video sources, including external cameras and built-in device cameras, for live streaming and recording. It offers advanced features like real-time transitions, overlays, picture-in-picture effects, and remote control capabilities.

Highlights
  • Multicam switching (up to 9 inputs)
  • Supports NDI, SRT, UVC, RTSP protocols
  • Real-time transitions and playback
  • Customizable overlays (titles, logos, clock)
  • Picture-in-picture effects
  • Remote title overlay via LAN
  • Live sports slow-motion playback
Features
Read full description

- Up to 9 inputs could be TopDirectorCam or any other external A/V sources that support NDI, NDI HX, SRT and RTSP protocols - Up to 4 UVC(USB -> HDMI) camera inputs on iPadOS 17 - Start all the built-in cameras on the iPhone/iPad simultaneously (Pro Max models could have up to 4 cameras, the earlier models could only choose one between the front and rear cameras) - Real-time transition among the external inputs, built-in cameras, and media in the Photo Library - Full Screen External HDMI & Wireless AirPlay via Screen Mirroring/AirPlay - Use the RTMP protocol which is used by most of the video platforms to 3 channel live streams, local record for backup, NDI or NDI|HX output at the same time - No need for cumbersome timeline operations, real-time playback to edit, getting video post-production easily - Valuable background music feature to easily create electronic albums with the Ken Burns special effects of photos - Customized and unlimited vector title and shape overlay with professional safety Down Stream Key(DSK) control - Independent and unlimited layers of translucent logo overlay and clock, countdown, and scoreboard - Support TopDirectorTitle App for remote title overlay via LAN, suitable for complex subtitle operations in live broadcasting - Perfectly embedded Apple Pencil (or use finger on the iPhone) to realize online sketch comments - Picture-in-picture effects for remote interviews, online teaching, video conferencing, etc, fully customizable video source, window size and position, distortion, dynamic background, edges, reflections, blur, and more - Used in conjunction with TopDirectorCam app for real-time slow-motion playback of live sports games - All operations support unlimited Undo and automatic alignment snap feature that all the professional people needed - Support the TALLY feature to mark the current PGM camera when switching among multiple cameras - Unique security protection keep maintaining output even in the background - No need to register, no any other subscription fees, one-time purchase for lifetime use Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

NDI Test Patterns3 screens
TopDirector (NDI,SRT,UVC,RTSP)4 screens

Verdict

The call

The clearest difference is review sentiment: NDI Test Patterns at 100% against TopDirector (NDI,SRT,UVC,RTSP)'s 38%. NDI Test Patterns also leads on rating (5.0 vs 4.1) and in-app purchases (none vs 10). TopDirector (NDI,SRT,UVC,RTSP)'s advantage is update cadence (every 10 days vs every 4 months) and ratings volume (114 vs 2). On price, ads and device support 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

Both are free to download. TopDirector (NDI,SRT,UVC,RTSP) sells 10 in-app purchases, starting at $49.99 per year. NDI Test Patterns asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

NDI Test Patterns holds the better App Store score, 5.0 against 4.1. That said, the two scores are not equally well evidenced: TopDirector (NDI,SRT,UVC,RTSP) has 114 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 100% of NDI Test Patterns's written reviews are positive against 38% of TopDirector (NDI,SRT,UVC,RTSP)'s.

UpkeepUpdate frequency

NDI Test Patterns ships an update every 4 months, TopDirector (NDI,SRT,UVC,RTSP) every 10 days. The most recent releases landed on October 6, 2026 and October 22, 2026 respectively.

Scorecard7 real differences · 3 level
NDI Test Patterns versus TopDirector (NDI,SRT,UVC,RTSP): the parameters behind the verdict, then further details
ParameterNDI Test PatternsTopDirector (NDI,SRT,UVC,RTSP)
PriceFreeFree
Rating5.0 (2 ratings) — better4.1 (114 ratings)
Positive reviews100.0% of reviews — better37.5% of reviews
Number of ratings2114 — better
Update frequencyEvery 4 monthsEvery 10 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterPaid
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS14.4 — better17.6
Further details — not scored
Size10 MB98 MB
Age rating4+4+
DeveloperVi(z)rt, IncTopDirector Corporation

Customer experience

NDI Test Patterns

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

TopDirector (NDI,SRT,UVC,RTSP)

All ratings114 ratings
Positive71.1%
Neutral10.5%
Negative18.4%
Written reviews40 reviews
Positive37.5%
Neutral12.5%
Negative50.0%

Bugs and requests

NDI Test Patterns

Not enough reviews yet to summarise bugs or requests.

TopDirector (NDI,SRT,UVC,RTSP)

Reported bugs

17 issues
  • Crashes at opening on iPad Pro M2
  • iPad camera always 30fps despite correct config
  • App freezes when syncing iPad Pro with iPhone
  • App crashes every time after latest update
  • App won't open if 'Don't allow' is selected for album access
Show 12 more
  • NDI streaming to another computer does not work
  • Cannot choose save location for recorded files (reverts to camera roll, renames/changes resolution)
  • SRT does not work
  • SRT output livestream not supported
  • Audio of video clips does not work
  • Audio does not work
  • Video playback only works for clips under 10 seconds
  • App crashes when feeding in 5 to 6 cameras
  • App randomly crashes
  • Tally does not work
  • No audio from iPhones via NDI
  • App crashes on launch after update

Requested features

19 requests
  • PIP templates with square or round screens
  • Scrolling text in overlays
  • Ability to replay, back-forward, adjust speed, freeze
  • RTMP input support
  • OSC control for Stream Decks
Show 14 more
  • Tutorials on optimal NDI usage
  • Add a next cam option
  • Better character generator
  • Fix video playback for clips over 10 seconds
  • Improve bitrate for YouTube streaming
  • Add SRT output support
  • Improve audio functionality
  • More intuitive wireless camera setup
  • Provide how-to videos or tutorials
  • Allow recovery of previously purchased features
  • Implement a trial period
  • Fix tally functionality
  • Add audio support for NDI streams
  • Improve output section stability

In-app purchases

None

NDI Test Patterns

No in-app purchases

10 purchases

TopDirector (NDI,SRT,UVC,RTSP)

Subscriptions1
  • Unlock All Features$49.991 Year
One-time9
  • NDI and TALLY$4.99
  • Enable USB(UVC) Camera Input$4.99
  • Screen Mirroring/AirPlay$9.99
Show 6 more
  • PTZ Camera Control$9.99
  • Picture in Picture Watermark$14.99
  • Logo and Background Music$14.99
  • Video Scopes, Color Grading$14.99
  • UTitle, Title, NTitle, SuperFG$14.99
  • Unlimited PGM Duration$14.99

Questions

Is NDI Test Patterns free?
NDI Test Patterns is free to download, with no in-app purchases.
Is TopDirector (NDI,SRT,UVC,RTSP) free?
TopDirector (NDI,SRT,UVC,RTSP) is free to download, with in-app purchases available.
Which has better reviews, NDI Test Patterns or TopDirector (NDI,SRT,UVC,RTSP)?
NDI Test Patterns is rated higher. NDI Test Patterns averages 5.0 out of 5 from 2 ratings, while TopDirector (NDI,SRT,UVC,RTSP) averages 4.1 from 114 ratings.
Do NDI Test Patterns or TopDirector (NDI,SRT,UVC,RTSP) have ads?
Neither NDI Test Patterns nor TopDirector (NDI,SRT,UVC,RTSP) shows ads.
Which is updated more often, NDI Test Patterns or TopDirector (NDI,SRT,UVC,RTSP)?
NDI Test Patterns ships an update every 4 months, and TopDirector (NDI,SRT,UVC,RTSP) every 10 days. Most recently, NDI Test Patterns was updated on October 6, 2026 and TopDirector (NDI,SRT,UVC,RTSP) on October 22, 2026.

Other comparisons