LiveHeat vs Sill
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
LiveHeat
This app displays real-time core body temperature directly on your Apple Watch, independent of your iPhone. It visualizes temperature zones with color-coding and a position needle, and can pair with heart rate monitors for a combined view. Track time spent in each zone and customize settings for personalized training.
- Real-time core body temperature display
- Standalone Apple Watch app
- Color-coded temperature zones
- Heart rate and temperature pairing
- Zone time tracking
- Customizable temperature and HR zones
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The only Watch app that shows your CORE body temperature in real time, no iPhone needed. STANDALONE ON YOUR WRIST Most sports sensors need your phone nearby to display data. LiveHeat connects directly to your CORE sensor over Bluetooth and streams live readings to your Apple Watch, every second, hands-free, whether your phone is in your bag or at home. 4 TEMPERATURE ZONES AT A GLANCE Color-coded zones show exactly where your body is: - Baseline: normal resting temperature - Elevated: body beginning to heat - Heat Training: optimal training window - Danger: take action now A live position needle shows where you are within each zone, not just which zone you're in. HEART RATE + TEMP TOGETHER Pair a Bluetooth HR strap (Polar H10, Garmin, and others) simultaneously. See your core temp and heart rate side by side with independent zone indicators on a single screen. ZONE TIME TRACKING Track how long you've spent in each temperature zone during your session. Daily totals reset at midnight. Ideal for heat acclimatization protocols and training load monitoring. FULLY CUSTOMIZABLE Adjust temperature zone boundaries to match your physiology Set custom heart rate zone thresholds Toggle between °C and °F All settings sync instantly, no app restart needed WHO IT'S FOR Built for endurance athletes, cyclists, triathletes, and anyone using heat training or heat acclimatization protocols. If you wear a CORE sensor, this app turns your Watch into a dedicated real-time display, the one you've been waiting for. COMPATIBILITY Requires Apple Watch and a CORE body temperature sensor (by greenTEG). Compatible with any Bluetooth Low Energy heart rate monitor. Apple Watch is a trademark of Apple Inc. CORE is a trademark of greenTEG AG. This app is not affiliated with or endorsed by greenTEG AG.
Sill
Stream your Mac's desktop or individual windows to your iPhone or iPad. Control your computer remotely using touch, keyboard, or Apple Pencil with encrypted connections. Offers flexible streaming quality and connection options.
- Stream Mac windows or desktop to iPhone/iPad
- Remote control with touch, keyboard, Apple Pencil
- Encrypted connections with TLS 1.3
- Adjustable streaming quality and frame rate
- Virtual display option for continuous updates
- Multiple connection modes (Wired, Wi-Fi, Direct, Remote)
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Sill shows a window from your Mac, or its whole desktop, on your iPhone or iPad, and lets you use it with touch, a keyboard, a touchscreen trackpad or Apple Pencil. It streams straight from your Mac to your device over your own network, so there is no account to create and no server in between. You pair each device once, and every connection is encrypted. Both parts are free: the Sill app for iPhone and iPad, and Sill for Mac. Streaming: * Any single Mac window, or the whole Desktop, on your iPhone or iPad * Hardware HEVC video, up to 120 fps on ProMotion screens (60 elsewhere); the rate follows each device * Seven bitrate quality presets, from Low (4 Mbps) to Extreme (150 Mbps), plus Resolution, a frame-rate limit and Prioritize Encoding Speed * Text size (Aa): resizes your Mac window to fit your screen, so text is the size you want * Optional virtual display: a window streams from its own HiDPI display, sized to your device, and keeps updating even when covered on your Mac; full-screen video works too Controls: * Touch: tap to click, drag to scroll with momentum, touch and hold to right-click * Apple Pencil as the mouse, with hover * Software and hardware keyboards, with ⌘, ⌃ and ⌥ shortcuts, plus a key row with latching modifiers and a Spotlight key * Laptop layout when you hold the device upright: the picture on top, a key row and a trackpad (two-finger scroll, two-finger tap, hold then drag, three-finger gestures for Mission Control, App Exposé, switching Spaces, Apps and Show Desktop) * Dedicated iPhone and iPad layouts * Each Mac app's menus (File, Edit, View, etc) on your device, behind a Menus button * Window thumbnails: switch with a tap; hold one for close, minimize and full screen; drag to reorder * An Apps drawer: open windows and all installed apps, with search, and it launches apps Connecting: * Finds your Mac automatically; each Mac has 4 modes: Wired, Wi-Fi, Direct or Remote * USB cable (Wired) support, and a live session moves between the cable and Wi-Fi without dropping * Direct Wireless Connection (Direct, optional), for when you and your Mac don't share a network * Remote Access from anywhere through your own VPN, such as Tailscale, or a port forward * Pairing: every connection encrypted with TLS 1.3; pair each device once by QR code or a 12-digit code, and a USB cable pairs by itself; Require pairing is on by default * Your Mac keeps its keys in the protected part of its keychain that only Sill can read Sill for Mac: * A ~6 MB menu bar app with a live status card: each device, its frame rate and latency * Settings: General, Devices, Streaming, Virtual Display, Remote Access and Permissions * Launch at Login, a log window, and an update check that tells you when a new version is out * A notarized disk image download from getsill.app Sill for iPhone and iPad: * A Settings panel that changes your Mac's stream settings, and shows the connection and latency * A first-run tour, and Take the Tour to replay it * Tells you when your Mac or the device needs an update Free and open source (Apache 2.0) No account, no servers, no tracking: video goes straight from your Mac to your device, forever! Website: https://getsill.app/ GitHub: https://github.com/Saffsanity/sill Site GitHub: https://github.com/Saffsanity/sill-site
Screenshots
Verdict
The clearest difference is price: Sill at Free against LiveHeat's $9.99. Sill also leads on ratings volume (44 vs 1) and update cadence (every 2 days vs weekly). On rating, review sentiment, ads and in-app purchases 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
Sill is free to download; LiveHeat costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for LiveHeat against 4.9 for Sill. That said, the two scores are not equally well evidenced: Sill has 44 ratings behind it against 1, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.
LiveHeat ships an update weekly, Sill every 2 days. Both last shipped on October 31, 2026.
| Parameter | LiveHeat | Sill |
|---|---|---|
| Price | $9.99 | Free — better |
| Rating | 5.0 (1 ratings) — better | 4.9 (44 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 1 | 44 — better |
| Update frequency | Weekly | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, Apple Watch | iPhone, iPad |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 2 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Nils Albertsen | NOAH WILLIAM SAFFER |
Customer experience
LiveHeat
Sill
In-app purchases
LiveHeat
No in-app purchases
Sill
No in-app purchases









