Unofficial · iPhone · Watch · Widgets

Know it's ready
before you go outside.

A fast, quiet companion for your Arctic Spas hot tub. Temperature, pumps and chemistry on your Lock Screen, your watch face, or your pocket — before you've put shoes on.

Key stays in your keychain No login, ever No setup on the watch
Live
38°C
At target · OK
pH 7.42 ORP 680 mV Pumps 2/5
LOW
OK
HIGH
01 · The status screen

One glance,
one answer.

The home screen answers exactly one question — is it ready? — and gets out of the way. Temperature, target, pH and sanitiser, all live, all before you've unlocked your phone at the door.

The ring itself tells the story: cool teal climbing to warm ember as the water approaches your setpoint, so the state reads before the number does.

Background updates are opportunistic — the app says so, rather than promising round-the-clock watching it can't deliver.
MySpaSimple status screen showing 38°C, pH 7.42 and sanitiser 680 mV, both OK
02 · Pumps

Every pump,
on its own.

Most spa apps give you one button: everything on. MySpaSimple gives you five — each pump switched individually, from your phone or straight off your wrist, because "easy mode" isn't always what you want.

Your tub's actual layout, not a generic one: this app knows a five-pump swim spa looks nothing like a two-pump lounger, and adjusts — blowers included only if you actually have them.

MySpaSimple pump control screen with five individually switchable pumps
03 · Chemistry

A band,
not a number.

7.42 means nothing at a glance. A dot sitting calmly in the middle of a green band does. MySpaSimple reads pH and ORP the way you actually decide whether to get in — low, OK, or high — and explains what each figure is measuring, in plain language.

Alerts wait for a reading to persist before they bother you. Bathing causes short swings; the app doesn't cry wolf over one of them.

MySpaSimple chemistry screen showing pH and ORP as green OK bands
04 · Tub mode

2026,
not 1986.

Every hot tub control panel since the Reagan administration has looked the same: beige buttons, seven-segment digits, a manual you've lost. Tub mode is the poolside screen you actually want to touch — big glowing pads, one thumb, in the dark, without your glasses.

Jets, lights and setpoint, all reachable one-handed, lit from within so it reads before it's even in focus.

MySpaSimple tub mode with glowing ember-lit jet and light controls
05 · Setup

Paste one key.
That's it.

No account to create in-app. No password to lose. Sign in once at myarcticspa.com, generate a key, paste it — and the app never asks again, because there's no session sitting around to expire.

Your Apple Watch doesn't even get its own setup screen: the phone hands the key across automatically, over an on-device connection that never touches the network.

MySpaSimple onboarding screen: paste your API key
Read before you install

The spec sheet,
not the sales pitch.

Every hot tub app promises the world. This is what MySpaSimple actually does, measured against what the Arctic Spas API actually provides — not what would look better in a screenshot.

Background monitoring Best-effort. iOS decides when the refresh task runs — sometimes several times a day, sometimes not for days. The app tells you this in Settings rather than promising alerts it can't guarantee.
API rate limit 15 requests per minute, measured against the live server. Five are always held back for your own taps, so a background poll never makes a button feel slow.
Chart history Starts at your first launch. Arctic's API keeps no history of its own, so there's nothing to import — only to export, which Settings lets you do as CSV.
Heater state Inferred from the temperature trend, not reported directly — the API has no field for it. The Live Activity tracks your tub's own measured heating rate rather than a guess.
Key storage Your iPhone's keychain, shared to your Apple Watch over WatchConnectivity. Never logged, never bundled into a crash report, never sent anywhere except Arctic Spas.
Affiliation None. Unofficial third-party client, not affiliated with, endorsed by, or produced by Arctic Spas. "Arctic Spas" and "Spa Boy" are their trademarks.