From Blinking Light to AI Briefing: A Short History of Work Notifications

Every powerful habit starts small. The history of work notifications begins with a red light blinking in the corner of a BlackBerry, and it arrives, about twenty-five years later, at software that reads your messages and decides whether you need to see them at all. Each step along the way answered one more question for the reader: did something happen, where is it, what should I do, how urgent is it, and finally, does it need me at all?

The signal era: a light in the corner

Before push, email was something you went and fetched. Messages waited on a server until your device asked for them, so you checked, refreshed and checked again. Push email reversed the direction. BlackBerry's servers watched corporate inboxes and relayed each new message as it arrived. The signal itself was almost nothing: a buzz, a tone, a blinking light. No sender, no subject, no urgency. It said only one thing: something is here.

And yet that blink changed everything. For the first time, work could find you. You no longer had to keep checking; you could trust the device to tell you. That trust is where our dependence on notifications began, and the BlackBerry earned the nickname "CrackBerry" for a reason. It is worth remembering that this revolution started at work, not at home. The very first push notifications were work notifications.

The badge era: the dot learns to speak

In June 2009 Apple opened push notifications to every iPhone app. Developers could send three things: a badge, a sound and a short line of text. Demand was strong enough that Apple spent months stress-testing the service before launch (AppleInsider). A red number told you how much was waiting, a line of text told you who it was from, and for the first time you could glance and decide: open it now, or let it wait.

You could also choose. App by app, people decided whether they wanted a sound, a banner, a badge or nothing at all. Many said no: in Airship's 2021 benchmark, a median of 51% of iOS users opted in, against 81% on Android, where notifications were on by default (Airship). The flow grew anyway. By June 2013 Apple had sent 7.4 trillion push notifications (MacStories). When Slack and Teams arrived at work, they inherited this language completely: a count, a dot, a ping.

The action era: the notification comes alive

Answering a message used to be a ritual: notice the alert, unlock, open the app, wait, find the message, read it, reply. In 2014 iOS 8 let people reply or accept an invite straight from the banner, and the ritual collapsed into a single gesture. The notification stopped being a sign pointing to the work and became a place where work happens. Rich notifications followed in 2016 and grouping in 2017 and 2018. The red dot had become a small, living piece of the app it came from.

The triage era: learning when to speak

Success brought its own problem. By 2021 the question was no longer what notifications said, but whether they should speak at all. iOS 15 gave every notification an interruption level, from silent "passive" to "critical", and added Focus modes and scheduled summaries (Apple WWDC21). Notifications had learned manners. Most could wait for a summary; a few were allowed to knock while you concentrated.

The AI judgement era: a front desk for your attention

Now notifications have begun to think. AI reads the messages, summarises the threads and judges whether something truly needs you. In December 2025 Slack rebuilt its notifications and added agent notifications with action buttons, where software reports what it has done and asks only for your decision (Slack). It is like gaining a front desk: someone who answers every call, handles what they can, and puts through only the ones that need you.

Why it keeps happening

Notifications did not grow on their own. They grew because work changed beneath them. Remote work turned the tap on the shoulder into a message: a study of more than 61,000 Microsoft employees found it cut synchronous communication and increased asynchronous messaging (Nature Human Behaviour). Today the average worker receives 117 emails and 153 Teams messages a day (Microsoft). Nobody reads 270 messages in full. They read the notifications and decide from there.

Each era did not replace the one before it; it added to it. A notification today still says that something happened, but it also says where, what to do, how urgent it is and whether it needs you. That is why the next posts in this series look at what notifications are made of, why they scatter across your tools, and how to write ones people can act on. If you want the practical side right away, start with 7 systems people use to tame their notifications.

Frequently asked questions

When were push notifications invented?

Push email arrived with BlackBerry in the late 1990s and early 2000s, relaying corporate email to devices as it arrived. Apple opened push notifications to all iPhone apps in June 2009.

What are the eras of work notifications?

Five eras: the signal (something arrived), the badge (what and where), the action (reply from the banner), triage (how urgent, may it interrupt) and AI judgement (does it need you at all).

Why are there so many notifications at work?

Work became remote, asynchronous and spread across many tools and time zones, and software started sending notifications too. Volume rose faster than attention, so each notification had to say more.

The tiny red light on a BlackBerry has grown into something close to an assistant. Quietly, almost unnoticed, notifications have become one of the most important layers of working life.