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Version
1.1.2
Size
1.11 Mb
Updated
3 weeks ago
Released
17 Aug 2026
Description
4:20 is an SMPTE LTC timecode reader and generator for iPhone and iPad. It reads timecode from a wired audio input and shows lock, frame rate, drop frame, measured rate, direction, and level. It can generate LTC at the same time, over the same connection.
The reader is made for troubleshooting. When a rig will not chase, plug into the line and check the code where you stand: the rate as measured against what the source claims, drop frame or not, which direction it is running, and how hot the line is. Mislabeled rates, code that should have stopped, and low or clipping levels all show up in the first few seconds. Between cues, it works as a confidence monitor on any line you need to trust.
The screen does not sleep while a mode is running, and timecode keeps going when you switch to another app. Checking a message does not stop the code.
READER
• Lock state and a full readout: frame rate with drop frame flag, measured rate, direction, level
• Runs continuously and keeps reading through route changes and interruptions
• Keeps reading in the background while you use another app
• If iOS takes the audio session away, the readout dims and says so instead of holding stale numbers
GENERATOR
• 23.976, 24, 25, 29.97 drop frame, and 30 fps
• Start from any timecode, or generate time of day
• Output level control, with left, right, or both channel routing
• Anchored to the system clock, so long runs hold their time
• Keeps generating in the background while you use another app
• Runs alongside the reader for loop-through checks
• Warns before sending LTC to a speaker, Bluetooth, or AirPlay, and requires a press-and-hold to override
REQUIREMENTS
A wired audio connection: a class-compliant USB audio interface, or a headset-jack adapter with a line input. There is no microphone mode. This version reads and generates LTC only; MIDI timecode is not supported.
PRIVACY
No account, no analytics, and no network connection. Nothing leaves the device.
Made for production sound, playback and show control, video engineering, DIT carts, and broadcast maintenance.
Estimates
Availability
Devices
iPhone5s
iPadAir
iPadAirCellular
iPadMiniRetina
iPadMiniRetinaCellular
iPhone6
iPhone6Plus
iPadAir2
iPadAir2Cellular
iPadMini3
iPadMini3Cellular
iPodTouchSixthGen
iPhone6s
iPhone6sPlus
iPadMini4
iPadMini4Cellular
iPadPro
iPadProCellular
iPadPro97
iPadPro97Cellular
iPhoneSE
iPhone7
iPhone7Plus
iPad611
iPad612
iPad71
iPad72
iPad73
iPad74
iPhone8
iPhone8Plus
iPhoneX
iPad75
iPad76
iPhoneXS
iPhoneXSMax
iPhoneXR
iPad812
iPad834
iPad856
iPad878
iPadMini5
iPadMini5Cellular
iPadAir3
iPadAir3Cellular
iPodTouchSeventhGen
iPhone11
iPhone11Pro
iPadSeventhGen
iPadSeventhGenCellular
iPhone11ProMax
iPhoneSESecondGen
iPadProSecondGen
iPadProSecondGenCellular
iPadProFourthGen
iPadProFourthGenCellular
iPhone12Mini
iPhone12
iPhone12Pro
iPhone12ProMax
iPadAir4
iPadAir4Cellular
iPadEighthGen
iPadEighthGenCellular
iPadProThirdGen
iPadProThirdGenCellular
iPadProFifthGen
iPadProFifthGenCellular
iPhone13Pro
iPhone13ProMax
iPhone13Mini
iPhone13
iPadMiniSixthGen
iPadMiniSixthGenCellular
iPadNinthGen
iPadNinthGenCellular
iPhoneSEThirdGen
iPadAirFifthGen
iPadAirFifthGenCellular
iPhone14
iPhone14Plus
iPhone14Pro
iPhone14ProMax
iPadTenthGen
iPadTenthGenCellular
iPadPro11FourthGen
iPadPro11FourthGenCellular
iPadProSixthGen
iPadProSixthGenCellular
Pricing by country
| Country | Price |
|---|---|
| Canada | 6.99 CAD |
| China | 38 CNY |
| France | 5.99 EUR |
| Germany | 5.99 EUR |
| Italy | 5.99 EUR |
| Netherlands | 5.99 EUR |
| Portugal | 5.99 EUR |
| Spain | 5.99 EUR |
| UK | 4.99 GBP |
| India | 499 INR |
| Japan | 800 JPY |
| Korea, Republic Of | 7700 KRW |
| Poland | 24.99 PLN |
| Russia | 449 RUB |
| Turkey | 249.99 TRY |
| USA | 4.99 USD |
| Ukraine | 5.99 USD |
