Concert sign check
A phone is a small screen, so a phone sign lives or dies on how few words it has and how big they end up. Type the message you’d hold up and this reads it against the rules in our phone concert sign guide: hold it still or scroll it slowly, which colour on black, and what to cut. It won’t make the letters smaller to squeeze a sentence in — that’s the mistake the guide is written against.
How this works
The message goes in, tidied the way the guide says a sign should be — capitals, no punctuation you don’t need — and then three questions get answered in order. Is it short enough to be a sign at all? Does it fit across a sideways phone at a size someone can read, or does it need to scroll? And which colour on a black background carries it furthest?
Past eight words it stops at the first question. There’s no scroll speed or colour that makes a sentence readable on a phone from the back of a crowd, and a tool that picked one anyway would be helping you do the thing the guide warns about. It gives you the cut instead, with the guide’s example for the kind of sign you’re making.
Where the rules come from
Every rule is from How to make a concert sign on your phone: one idea in three to five short words; capitals; one emoji at most; hold it still if it fits across the screen in landscape at a large size, otherwise scroll it slowly rather than shrinking the letters. The colours are the guide’s table, quoted:
| Combination | How it reads in the dark | The tool uses it for |
|---|---|---|
| Yellow on black | The most legible at distance | Song requests, and anything short you want read |
| White on black | Very clear, slightly harsher | Long scrolling messages |
| Cyan or green on black | Stands out from phone-torch white | Find-me signs |
| The artist’s colour on black | Good if the colour is bright | When you ask for it, and it’s bright enough |
| Dark text on a bright background | Glows, but the letters get lost | Never |
Four things on this page are ours rather than the guide’s, because the guide describes them in words and a tool needs a number. “A large size” is letters at least a quarter of the screen’s height, on a 19.5:9 iPhone held sideways — which comes out at about nine characters, spaces included, before a message has to scroll. The letter sizes are estimates for a bold, evenly spaced LED-style font; a different app’s font will move them a little. “Bright enough” for an artist’s colour is a contrast of 4.5:1 against black, the WCAG line for readable text, which is where dark reds, navy and deep purples fall out. And nine words is where we stop calling it a sign.
If you’re not sure, scroll it
The two mistakes aren’t equal. A message that would have fitted still but scrolls slowly instead costs a second of the artist’s attention. A message held still with small letters costs the whole sign — it reads fine in your hand and not at all from the stage. So where the estimate is close, the tool leans towards the scroll, and the one thing it will never suggest is making the letters smaller.
What it can’t see is your phone. Auto-Lock to Never, Auto-Brightness off, Night Shift off and Guided Access on are Step 4 of the guide, and they’re the difference between a sign and a black screen at the moment it matters.
- How to make a concert sign on your phone — the guide these rules come from, with the four settings and how to hold it up without blocking anyone
- The best LED marquee apps for iPhone — the apps that put the message on the screen, sorted by the job
- LEDit alternatives — if you need video export, vertical scrolling or a static signboard
A sign that nothing interrupts
LiveMarquee turns your iPhone into a bright LED-style sign: type the message, pick a colour and scroll speed, and play. No ads, works fully offline in a stadium with no signal, and your message never leaves the phone. The free version shows your text in full — white text on a black screen is never behind a paywall.
Get LiveMarquee on the App Store →