MULTILARM // GUIDES

Athan Clocks vs Apps vs Full Systems: How to Choose

Three ways to run the adhan — honestly compared · 6 min read

Last updated 2026-08-09

If you want your masjid to play the adhan and manage announcements, you have three broad choices: a standalone athan clock, a prayer-time app, or a full mosque audio system. They solve different problems. This honest comparison helps you pick the right one.

How do athan clocks, prayer-time apps and full systems compare?

An athan clock displays prayer times on a wall and, on some models, chimes. A prayer-time app shows times and plays the adhan on one person's phone. A full mosque audio system plays the adhan through the building's own speakers on a schedule and also handles announcements, zones, a display board and emergency alerts. The table below sets them side by side.

1. Athan clocks

What they are: wall-mounted units that display the five prayer times and the iqamah countdown, and on some models chime or play a short adhan through a small built-in speaker. They are sold as a finished appliance: you hang it, set the city or the times, and it needs nothing else.

Good for: a simple, familiar display of times and iqamah. Limits: single-purpose. They generally don't run announcements, don't split the building into zones, don't handle emergencies, and often need manual seasonal updates. They're a display, not a system. See our display board comparison.

2. Prayer-time apps

What they are: phone applications that calculate and display prayer times and play the adhan through the phone's own speaker, for the person holding it. They are designed around one individual's daily prayer, not around a building or a congregation.

Good for: individuals. Limits: an app can't run your masjid. It won't play the adhan through the building's speakers, can't make announcements to the congregation, and has no role in emergencies. It's a personal tool, not masjid infrastructure.

3. Full mosque audio systems

What they are: a small always-on controller (often a Raspberry Pi) that runs prayer times, plays the adhan through your existing speakers, schedules announcements, supports live push-to-talk, drives a display board, handles zones, and raises emergency alerts — all managed from a phone or web dashboard.

Good for: any masjid that wants everything automated and controlled remotely. Consideration: it's a system to set up (though no coding is required, and support/training are usually available).

Multilarm is a full system of this kind. It reuses your existing amplifier and speakers, runs on low-cost hardware, and covers:

• automated adhan and iqamah timers,
• scheduled and live announcements,
• emergency alerts with phone notifications,
• a visual display and remote control from anywhere.

Which should you choose?

• Just want times on your phone? → a prayer-time app.
• Want a tidy prayer-time display on the wall, nothing more? → an athan clock.
• Want the masjid to run itself — adhan, announcements, display and emergency alerts, controlled remotely? → a full mosque audio system.

Most masjids that start with a clock or app eventually want the announcements, zones and emergency features only a full system provides — which is why it's worth trying one before you decide.

Which of the three is right for our masjid?

Feature tables are easy to skim and hard to act on. These are the moments that actually separate the three options, drawn from what masjid committees run into.

1. Fajr in December. The time moves by more than an hour across the year and nobody is at the masjid to press anything. All three handle the calculation. Only a full system plays the adhan through the hall's speakers without a human present, and only a full system can fade it in so the first thing anyone hears is not a full-volume takbir.

2. The committee agrees its own times. Many masjids do not use a calculated time straight — they round, or follow a local convention, or set iqamah by agreement. An app gives you its calculation. A clock usually gives you a calculation plus an offset. A full system lets you paste the timetable your committee actually agreed, for the whole year.

3. Ramadan. Different times, extra announcements, and a hall that is full at times it is normally empty. The question is not whether a system can display Ramadan times — it is who changes it, and whether it changes back. Date-scoped configuration means it reverts on its own; a clock means somebody edits it twice.

4. "Can everyone please move their cars." The single most common real requirement, and the one clocks and apps cannot touch at all. Either someone stands at the front and shouts, or the building has an announcement system.

5. A funeral announcement at short notice. Not scheduled, not recorded in advance, needed in ten minutes. A full system covers this three ways: record and preview before it goes out, speak live from a phone, or type it and let the on-device voice read it.

6. The fire alarm goes off during jumuah. A hall holding hundreds needs a voice telling people which exit to use, over the top of everything else, and nothing scheduled firing during it. This is a full-system-only capability, and worth saying plainly: it is also not a substitute for certified alarm equipment.

7. The person who set it up moves away. This is where clocks quietly win and badly-run systems lose. A clock's configuration is on the clock. A good system's configuration is a file that can be backed up, emailed and restored — but only if somebody knows it exists. Ask where the configuration lives before you buy anything.

8. The masjid is on two floors, or has an overflow room. Zoning only matters once there is more than one space, but then it matters a lot: the announcement about the women's section should not interrupt the class in the basement. Clocks and apps have no concept of it.

9. Someone needs to check it from home. Committee members are not at the masjid all day. Remote visibility — what is scheduled, what played, is it still running — is a full-system feature, and the implementation detail that matters is whether it needs ports opened on the masjid's internet connection. It should not.

10. It breaks on a Friday morning. Every option fails eventually. What differs is recovery: buy a new clock and re-enter everything; reinstall an app; or restore a configuration file onto any other computer and be running again in minutes.

If fewer than three of those ten situations describe your masjid, an athan clock is very likely the right purchase.

What is the full specification comparison?

The table near the top of this page is the short summary; the one below is the full version, feature by feature, intended to be printed and taken to a committee meeting. It covers scheduling, announcements, zones, emergency handling, remote control, ongoing cost and what happens when a unit fails.

When not to choose a full system

A full mosque audio system is the wrong purchase more often than its vendors admit, and this page is published by the makers of one, so here is the honest boundary. Choose something simpler when any of the following is true of your masjid:

• Nobody will own it. A system with no named person responsible drifts: times go stale, a speaker dies and nobody notices. An athan clock degrades gracefully; a system that nobody maintains does not. If your committee cannot name the person, buy the clock.
• You only want times on the wall. If there is genuinely no ambition to announce anything, a dedicated clock is purpose-built, needs no network, and has nothing to configure.
• The masjid has no usable speakers or amplifier. Software drives what exists. With no distribution at all, the first purchase is audio equipment and an installer, not a scheduler.
• The building has no power continuity or no safe place for a small computer. A box in a damp cupboard on an unreliable supply will fail, and it will fail on a Friday.
• You need certified life-safety equipment. Voice alerts over a PA are not a substitute for a certified fire detection and alarm system, which is regulated and installed by specialists.
• Somebody on the committee needs it to be a box with buttons. This is not a technical objection but it is a real one. A system nobody will touch is worse than a simpler one people use.

The honest overlap: a clock plus a phone app covers a surprising number of small masjids very well, at close to zero cost and near-zero risk. The case for a full system starts when announcements start — when someone is standing at the front asking people to move their cars.

What to ask a supplier before buying

Six questions separate a good supplier from an expensive one, whichever of the three routes you choose. Ask them before any money changes hands, and be wary of any answer that has to be checked with somebody else and then never quite arrives in writing:

1. Whose timetable is it? Can you enter the times your committee has agreed, or must you accept a calculation method chosen by the vendor?
2. What happens in Ramadan? Specifically: who changes it, and does it change back on its own?
3. Can it use our existing speakers? If not, the quote contains a cabling project — ask for it to be itemised separately.
4. Who can operate it? One person with a password, or the whole committee? What happens when that person moves away?
5. What happens when it fails? Is the configuration recoverable, and how long does a replacement take?
6. What is the ongoing cost, honestly? Licence, support, hosting, replacement parts. A one-off price with a mandatory annual something is not a one-off price.

What does each option cost over five years?

Sticker price is the wrong comparison, because the two routes fail and get replaced on different schedules. Over five years a single-hall masjid should expect roughly £150–£300 for the athan-clock route and £160–£400 for a self-installed full system. The rough breakdown is below.

The two are closer than people expect. The difference in what you get is not close at all — but if the extra capability will genuinely go unused, the clock is the better buy, and any supplier who will not say so is selling.

Try a full system free

See a complete mosque audio system live — free demo No installation; explore the dashboard and hear it work.

FAQ

Multilarm is a Raspberry-Pi-based announcement, prayer-time and emergency-alert system for mosques and facilities. Try the free live demo »