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No Watch Required

Sleep Tracker for iPhone — No Apple Watch Needed

Snollo uses your iPhone's microphone and on-device AI to detect snoring, sleep sounds, and sleep quality — overnight, in your bedroom, without a watch on your wrist.

Apple Watch is optional — pair one later if you want heart rate and detailed REM/Deep/Light stages. The iPhone-only mode is fully functional from night one.

Download Free — iPhone Only

iPhone · iOS 17+ · Apple Watch optional

Why you don't need an Apple Watch to track sleep

The microphone catches what a watch can't

Snoring, sleep talking, coughing, breathing pauses — these are audio events. An Apple Watch's accelerometer and heart-rate sensor can't detect them. The iPhone's microphone can, and Snollo's on-device AI classifies what it hears in real time.

Apple Watch battery dies during long nights

Many Apple Watch owners take the watch off to charge before bed. If you wear it to sleep, you wake up to find it low — and you've still missed sleep tracking on the nights you forgot. The iPhone on your nightstand doesn't have that problem.

Most people don't want a watch on at night

Wearing anything on your wrist while you sleep is a personal preference. Skin sensitivity, side sleepers, partners who don't like the light from the screen — there are real reasons to skip the watch. Sleep tracking shouldn't require a $400 wearable purchase.

An iPhone alone is more than enough

Snollo's iPhone-only mode tracks duration, detects sound events with timestamps and audio clips you can play back, calculates a nightly sleep quality score, and shows weekly trends. Apple Watch adds REM/Deep/Light stage detail and heart rate context — useful, but not essential.

How iPhone-only sleep tracking works

What happens between "tap Start before bed" and "open the report in the morning."

  1. 1

    Tap Start, place the iPhone within arm's reach

    Tracking does not begin until you explicitly tap Start. Place the iPhone face-down on the mattress beside you or on a nightstand within 1–2 meters of your head. Keep it plugged in. Lock the screen — Snollo runs in the background using iOS's audio recording entitlement.

  2. 2

    The microphone records ambient sound overnight

    Your iPhone's microphone captures the soundscape in your room. The audio exists only in the device's working memory while the on-device model processes it — frame by frame — into classifications.

  3. 3

    An on-device model classifies each sound

    Snollo's audio classifier runs on your iPhone, on Apple's machine-learning hardware. Every few seconds, it labels what it heard — silence, snoring, breathing, coughing, talking — with a confidence score. The raw audio is then discarded.

  4. 4

    Short clips of detected events are saved

    When Snollo detects a notable sound (a snore, a cough, sleep talking), a short clip is saved to your private iCloud container so you can play it back in the morning. The bulk of the night — silence — is never written anywhere.

  5. 5

    In the morning, you get a full report

    Tap to view your sleep duration, sound timeline, snore intensity over time, and a sleep quality score. Optional Apple Watch pairing later adds REM/Deep/Light stages, heart rate, and SpO₂ — all data automatically merges with your existing sound timeline.

iPhone Sleep Tracker Comparison

Which iOS sleep apps work without an Apple Watch — and what they cost.

iPhone Sleep Tracker Comparison
App iPhone-only mode With Apple Watch Account Price
Snollo ★ Full features REM/Deep/Light, HR Uses Apple ID Free + optional Premium
SnoreLab Full features Not supported Optional $3.99/mo Premium
Sleep Cycle Full features Limited (HR) Required $39.99/yr
Pillow Limited (paid) Better experience Required (Premium) Free + $4.99/mo
AutoSleep Not supported Required Not required $3.99 one-time

Based on publicly available App Store listings as of May 2026. Pricing reflects US App Store at time of writing.

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From the Snollo blog

Guide

REM, Deep, and Light Sleep — What Each Stage Does and How to Get More

A 5-minute primer on the four sleep stages: what REM, Deep, and Light each do for your body, how much you need, and how to track them on iPhone.

Guide

How Accurate Is Apple Watch Sleep Tracking? (What the Research Shows)

Apple Watch identifies light sleep at 86% sensitivity, REM at 83%, deep sleep at 51% vs polysomnography. What peer-reviewed research shows.

Guide

Why You're Still Tired After 8 Hours of Sleep (And How to See What's Actually Happening Tonight)

Eight hours in bed isn't restorative sleep. Seven evidence-based reasons you wake up exhausted — and how to collect your own sleep data tonight.

iPhone Sleep Tracking — FAQ

Can I track sleep with just my iPhone, no Apple Watch?
Yes. Snollo's primary sensor is the iPhone's microphone. The app detects snoring, breathing, coughing, and sleep talking using on-device audio classification. Place the iPhone near your bed (not under the pillow), tap Start, and you wake up to a full sleep report. Apple Watch is optional — pair one later for heart rate and detailed REM/Deep/Light stages.
Is iPhone-only sleep tracking accurate?
For sound-based detection — snoring, sleep talking, coughing, breathing patterns — iPhone-only tracking is highly accurate because the iPhone microphone is the actual sensor. For sleep stages, the iPhone alone infers a quality score from movement and sound, which is good enough to spot bad nights but less detailed than what an Apple Watch provides through heart rate variability.
Where should I place my iPhone for sleep tracking?
Place the iPhone face-down on the mattress beside you, or on a nightstand within 1–2 meters of your head. Avoid placing it under a pillow (overheats and muffles audio) or in another room. Keep it plugged in — the microphone is active all night.
What sleep trackers don't need an Apple Watch?
Most well-known sleep apps run on iPhone alone, including SnoreLab and Sleep Cycle. The differentiators are price, privacy, and free-tier features. SnoreLab and Sleep Cycle process bedroom audio on their own servers and require subscriptions for full features. Snollo classifies audio entirely on your iPhone, uses the Apple ID you already have (no separate Snollo account), and includes snore detection on the free tier.
Will tracking sleep on iPhone drain the battery?
A full night of audio sleep tracking on iPhone uses 10–15% of battery if you're not plugged in. Most people keep the phone charging on a nightstand, which makes battery drain a non-issue. The on-device model is designed for Apple's machine-learning hardware, which is significantly more efficient than cloud round-trips.
Does iPhone-only sleep tracking record everything I say?
No. Snollo classifies audio on-device and discards the raw audio immediately. Only short clips of detected sound events (snoring, coughing, sleep talking) are saved — to your own iCloud, under your Apple ID, across the Apple devices you sign into.

Track your sleep tonight — iPhone only

Free download. No watch required. Uses your Apple ID — no separate Snollo account. Audio stays on your iPhone.

Download Snollo Free

iPhone iOS 17+ · Apple Watch optional · Free to download