SleepViz vs Squirrel
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SleepViz
Transform your iPhone into a personal sleep lab. Record your sleep, detect snoring with audio clips, and view detailed sleep stages and vital signs. All your data stays private on your device, completely free.
- Sleep Score (0-100)
- Snore detection with audio clips
- Sleep stages from Apple Health
- Heart rate and SpO2 tracking
- Sleep trends and insights
- Offline functionality
- Private data storage
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SleepViz turns your iPhone into a pocket sleep lab. Place it by your bed, tap Start, and wake up to a full breakdown of your night — with real audio clips of what actually happened and your health data from Apple Watch. No account. No subscription. No cloud upload. Everything is free, and everything stays on your device. — WHAT SLEEPVIZ DOES — - Sleep Score (0–100) every morning, based on what we heard and how long you slept. - Snore detection with timestamped audio clips you can replay. - Sleep stages (Deep, Core, REM, Awake) pulled from Apple Health. - Heart rate, blood oxygen (SpO2), and respiratory rate from your Apple Watch. - Sleep trends chart so you can see patterns across the week and month. - Tailored "Why / How Improve" insights based on what was detected. - 30-day calendar to jump to any past night. — BUILT FOR REAL NIGHTS — - Live waveform and live event feed while you record. - Handles phone calls, alarms and interruptions automatically. - Crash-safe: if your phone dies mid-night, we recover the session. - Thermal-aware: warns you if your device is overheating. - Storage-aware: warns before a full night if space is low. - Works fully offline. No WiFi needed. — PRIVATE BY DESIGN — Your audio never leaves your iPhone. Ever. We don't have servers, we don't stream, we don't sell data. The microphone is only used while you're actively recording, and you can delete everything with one tap in Settings. Health data is read locally from Apple Health — never transmitted. — WHO IT'S FOR — - Snorers who want to know how loud, how often, and when. - Apple Watch wearers who want their sleep stages and vitals in one place. - Light sleepers tracking what wakes them up. - Couples settling the "you were snoring again" debate. - Anyone curious about what their body does between lights-out and morning. — HOW TO USE — 1. Pick your recording routine (daily or weekly — whatever fits your life). 2. Place your phone near the bed, plugged in. 3. Tap Start. Go to sleep. 4. Tap Stop in the morning and read your report. — 100% FREE — No paywall. No trial. No "unlock premium". Every feature — score, audio clips, sleep stages, vitals, trends, insights — is free for everyone, every night. Sleep better. Know your nights. Own your data.
Squirrel
This app helps individuals with ADHD capture thoughts, manage tasks, and track time effectively. It offers voice notes with transcription, automatic to-do creation from ideas, and visual time management tools. Designed to work with ADHD brains, it aims to reduce overwhelm and improve daily organization.
- Voice notes with instant transcription
- Automatic to-do creation from thoughts
- Visual time management with countdowns
- Body-doubling focus mode
- Habit tracking with streaks
- Calendar sync for reminders
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Your best ideas vanish the second you reach for a notes app. Squirrel catches every thought - just talk, tap, done. The second brain finally built for ADHD. Your brain isn't broken. Regular to-do apps just weren't built for it - they assume perfect focus, flawless memory, and a sense of time you don't have. Squirrel works WITH your brain instead of shaming it. Made by an ADHD brain, for ADHD brains. CAPTURE EVERYTHING (before it's gone) Brain dump in a tap - text or voice, like texting yourself Voice notes with instant transcription - no typing, no losing the thought Turn any thought into a to-do - your junk drawer becomes your plan NEVER FORGET (out of sight, out of mind - solved) Key dates become to-dos automatically - bills, birthdays, appointments land on your list the day they're due Reminders that actually reach you - and sync to Apple Calendar Squirrel buries the date and digs it up for you - so you don't have to remember SEE YOUR TIME (built for time blindness) The day in four simple quarters, with a countdown you can win A focus timer that quiets the other 99 tabs - one task, just start Body-doubling focus mode that keeps you company while you work KEEP MOMENTUM (gently) Track habits your way - tap to mark, glance to know Streaks and wins that celebrate you - never guilt you See your day fill up, one small done at a time MADE FOR YOU IF… • Your thoughts disappear before you can write them down • You're somehow always late, even when you "left on time" • Your to-do list just gets longer and you never get THROUGH it • You forget appointments even when you genuinely care • Normal productivity apps make you feel like a failure Squirrel is your external memory - the place to put everything so your brain doesn't have to hold it. Your brain hoards. Squirrel remembers. Give your scattered brain somewhere to land. Free to start. — Squirrel is a focus and organization tool, not a medical device or a substitute for professional care. Questions or feedback? We read everything - reach us in the app.
Screenshots
Verdict
The clearest difference is rating: Squirrel at 5.0 against SleepViz's 1.0. Squirrel also leads on ratings volume (4 vs 1). SleepViz's advantage is update cadence (every 9 days vs monthly). On price, ads, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Squirrel holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 4 respectively.
SleepViz ships an update every 9 days, Squirrel monthly. Both last shipped on October 31, 2026.
| Parameter | SleepViz | Squirrel |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) | 5.0 (4 ratings) — better |
| Number of ratings | 1 | 4 — better |
| Update frequency | Every 9 days — better | Monthly |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone | iPhone |
| Requires iOS | 16.1 — better | 17.0 |
| Further details — not scored | ||
| Size | 54 MB | 12 MB |
| Age rating | 4+ | 12+ |
| Developer | younesse el kars | Jaganathan Konar |
In-app purchases
SleepViz
No in-app purchases
Squirrel
No in-app purchases









