Comparison · Dedicated hardware bell controllers

Multilarm vs Bell timer appliances: an honest comparison

A programmable box wired into the amplifier that rings the bell at set times and does nothing else.

Checked against published documentation on 2026-08-30

A bell timer appliance is the right choice for a building whose timetable never changes and where nothing may be a computer. Multilarm is the right choice as soon as the exceptions — term dates, exam weeks, a different Friday — start costing somebody an afternoon.

This page is written by the makers of one of the two products, so the only version worth publishing is one that is specific about where the other one wins. Every section below names a buyer who should not choose Multilarm.

What Bell timer appliances is

A bell timer is a dedicated controller, usually rack or wall mounted, programmed through a small keypad or a manufacturer utility. It fires a relay or a stored tone at programmed times and is designed to be installed once and forgotten.

It is by far the most common thing Multilarm replaces, and for a large number of buildings it remains the correct purchase.

Where Bell timer appliances is better

It is finished. No operating system, no updates, no network, nothing to patch, nothing to expire.
Site staff understand it, and so does the electrician who will be there in ten years.
It survives a power cut and comes back on its own with no boot sequence worth the name.
Where policy forbids a general-purpose computer on the bell system, it is the only option — and that is a legitimate policy.
The purchase is a single object with a single price and no ongoing anything.

Where Multilarm is better

The exceptions. Rule overlays for exam fortnights and term dates that apply themselves and revert on their own, rather than being typed in and typed back out.
Announcements, not just tones — typed, spoken, and prioritised over the music.
A record of what actually played.
Remote change without a site visit, over an outbound connection with no firewall port opened.
Recovery. The configuration is a file that can be restored to new hardware in minutes, rather than a program in a box that dies with it.

Side by side

Cells reading “Not published” mean we could not find the answer in Various — Amano, Lathem, Sonik, Zhono and many others’s own documentation on 2026-08-30. That is not the same as “no”, and this table will not pretend it is.

Capability	Bell timer appliances	Multilarm
Nothing to patch or update	Yes	No — it is software, with signed self-reverting updates
Complex schedules with automatic reversion	Manual reprogramming	Yes
Spoken announcements	Usually stored tones only	Yes — typed and spoken offline
Record of what played	Rarely	Yes
Remote change	Usually on site	Yes, with no inbound firewall port
Configuration recoverable to new hardware	Usually re-entered by hand	Yes — restore a file
Uses existing amplifier and speakers	Yes	Yes
Cost	One-off hardware	One-off perpetual licence on a computer you may already have

Choose Bell timer appliances if

The timetable genuinely never changes.
There is nobody who will own a computer — not 'nobody technical', but nobody at all.
Site policy forbids a PC in that role.
The building is remote and unstaffed and simplicity beats capability.

Choose Multilarm if

Somebody reprograms the timer more than twice a year and resents it.
You want announcements as well as tones.
The timer is old, the manual is lost, and nobody knows how to change it.
Someone will eventually ask whether the bell actually rang.

How to check any of this

Multilarm’s own capabilities are published as machine-readable data at features.json, including every feature it does not have and the ones it has deliberately declined to build. Measured performance figures, with the method for each, are on the measured data page. The canonical facts about licensing, offline operation and the fire-alarm boundary are at facts.json. If anything on this page is wrong, say so and it will be corrected.

FAQ

Can Multilarm drive the physical bells we already have?

Yes — it drives relay channels, so existing bells and sounders can stay exactly where they are, on their own schedule.

What happens in a power cut?

The machine restarts and Multilarm starts with it as a service, on every supported install shape. It is a longer recovery than an appliance and that is an honest difference.

Sources

Everything stated here about another product is taken from that vendor's own public documentation on the date shown, and is limited to what they publish about themselves. Products change; if something below is out of date or wrong, tell us and it will be corrected. Where we could not find a published answer the table says so rather than guessing.

This entry describes a category rather than a single vendor, so there is no single document to cite. Take the questions on the how to choose page to any supplier in it.

Not sure this is the right purchase for your building? Ask a specific question — including whether you should be buying something else.