Blue means iMessage. Green means SMS, MMS or RCS. That is the whole of it. The colour is a routing indicator: it tells you which network carried the message, and nothing else about the message, the sender or the relationship.
It carries so much social weight because the routing happens to correlate with something people care about — whether the other person is on an Apple device — and because Apple has never given users a way to turn the distinction off.
What the colour actually tells you
| Blue bubble | Green bubble | |
|---|---|---|
| Which network carried it | iMessage, over the internet | SMS or MMS over the carrier network — or RCS, which is also green on an iPhone |
| Who is on the other end | An Apple device signed into iMessage | An Android phone, or an Apple device that could not reach iMessage at that moment |
| Encryption | End-to-end between the two devices | SMS and MMS: none worth the name. RCS: depends on the profile version both ends are running — check the current state before assuming. |
| Typing indicator and read receipts | Yes, if the recipient has receipts on | No for SMS. RCS restores some of it. |
| Tapbacks | Yes, as reactions | On older SMS they arrive as a line of text describing the reaction |
| Photos and video | Full quality | MMS compresses hard. RCS is much better. |
| What it costs the sender | Data | A carrier message, which may be metered |
| Status you get back | Delivered, and Read if enabled | Sent, and usually nothing more |
Blue is about the pipe, not the person
A blue bubble does not mean the message was read, that the sender is holding an iPhone, that the sender is a human, or that the sender likes you. It means Apple's servers carried the message instead of a mobile network.
Why a message from a business arrived in blue
This is the question that brings most people to this site. You got a blue bubble from a garage, a salon or a SaaS product, and blue is supposed to mean a person on an iPhone.
Apple has never published an iMessage API — there is no official way for a server to send one. So a business sending blue bubbles is doing it one of three ways: a hosted provider that runs Apple hardware on its behalf, a self-hosted bridge running on a Mac in someone's office, or a person typing on an actual phone. The first is the common answer, and the vendors that sell it are here.
Whether that is a good thing depends on your view. The blue bubble reads as a person rather than a broadcast, which is exactly why businesses want it and exactly why Apple has never opened it up.
Blue balloon, blue bubble, blue text
Three names for the same object, plus one genuine source of confusion. Apple's own developer documentation calls a message bubble a balloon — that is the term in the Messages framework — so 'blue balloon' and 'blue bubble' mean the same thing when someone is describing what they see in a thread.
Separately, Messages has screen effects, and one of them is balloons that float up the screen when the message opens. That is triggered deliberately by the sender (hold the send arrow, choose an effect) and says nothing about how the message was routed. If balloons animated across your screen, someone chose to send them.
When blue turns green
A thread that was blue and went green usually has a boring explanation. In rough order of likelihood:
- The recipient has no internet. iMessage needs data at both ends; SMS only needs signal. Your phone falls back automatically if 'Send as Text Message' is on.
- The recipient switched iMessage off, or signed out of their Apple Account.
- The recipient moved to Android — and possibly forgot to deregister their number, which is its own well-known mess.
- Your own connection dropped at the moment you hit send.
- The number was reassigned to a new person on a new device.
Green does not mean blocked
Blocking does not change bubble colour. If someone blocks you, your messages stay blue and keep saying 'Delivered' — Apple deliberately gives no signal, so that the block cannot be detected. Reading anything into a colour change here is a mistake people make constantly.
Why any of this matters commercially
Because the colour changes how the message is read. A green bubble from an unknown number reads as an alert, a code or a marketing blast. A blue bubble from an unknown number reads as a person who has your number for a reason. Same words, different frame.
That difference is the whole reason this category of software exists, and it is also the reason to use it carefully. Blue bubble vs green bubble sets out what the difference is actually worth, and when not to use iMessage covers the cases where the blue bubble works against you.
Related questions
- What does a blue text bubble mean?
- It means the message was sent over iMessage rather than SMS. Both people are on Apple devices with iMessage enabled, the message went over the internet, and it was end-to-end encrypted between the two devices.
- Does a blue bubble mean they read my message?
- No. Colour tells you which network carried the message, not what happened to it. Read receipts are a separate, optional feature — if the recipient has them switched off, a blue bubble will say 'Delivered' and nothing more, forever.
- Does a blue bubble mean the other person has an iPhone?
- It means they have an Apple device signed into iMessage — which could be an iPad, a Mac or an Apple Watch as easily as an iPhone. It can also mean a business is sending through a third-party service that bridges to iMessage.
- What does a blue balloon mean in a text?
- Two different things get called this. Apple's own developer documentation calls the message bubble a 'balloon', so a blue balloon is just a blue bubble. Separately, Messages has screen effects — one of which is balloons that float up the screen when a message is sent with the 'Balloons' effect. That one is decoration, not routing.
- Why did my blue message turn green?
- The message could not go over iMessage, so your phone fell back to SMS. The usual causes are the recipient losing internet access, turning iMessage off, or moving to Android — or your own phone having no data connection at the moment you hit send.
Still deciding?
Compare the services that can actually send this on the providers page, see what each one costs, or read the step-by-step guides.