BFOUR vs WatchDog Key
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BFOUR
This app connects to smart IoT devices like meat thermometers and hygro-thermometers. It offers guided cooking with preset meat types and doneness levels, and provides instant notifications for remote monitoring of your cooking and home environment.
- Connects to smart IoT devices
- Guided cooking system
- 12 USDA-referenced meat types
- 5 doneness levels
- Real-time alerts
- Remote monitoring
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Welcome to the BFOUR App, the innovative hub that connects your Bfour meat thermometer, hygro-thermometer and other Bfour smart IoT electronic products. Designed with ease of use in mind, the BFOUR APP is your gateway to a enjoyable smart-life experience. * Easy Setup, Effortless Cooking The BFOUR App simplifies your cooking with an intuitive interface that's easy to navigate. Whether you're a seasoned chef or a culinary novice, our app makes setting up your smart devices a breeze. With just a few taps, you can monitor and control the temperature of your meats and the humidity of your environment. * Guided Cooking System Harness the power of our Guided Cooking System, featuring 12 USDA-referenced meat types and 5 doneness levels. Cook like a professional with minimal effort, ensuring every dish is perfectly done to your liking. * Instant Notification, Freely Monitor With the BFOUR app, you can stay connected to your cooking and home environment, no matter where you are. Receive real-time alerts and enjoy the peace of mind that comes with knowing your home is always in sync with your needs. * Get to know us! Facebook: https://www.facebook.com/people/Bfour/100031967752039/ Instagram: https://www.instagram.com/bfour_meatthermometer/ YouTube: https://www.youtube.com/@BFour_sz/ TikTok: https://www.tiktok.com/@bfourshop_us This app requires at least one BFOUR device to operate (sold separately at our online store: https://bfour.cc/).
WatchDog Key
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Never truly unattended. WatchDog Key turns your iPhone into the remote for Rex, the watchdog living on your Mac. Step away from your laptop in a café, library, or co-working space and let Rex keep an eye on it. The moment something happens, you'll know. — What WatchDog Key does — Instant alerts. The second Rex detects tampering on your Mac, a push notification reaches your iPhone. No delay, no guesswork. Remote arm and disarm. Your phone is the key. Arm Rex before you walk away, disarm the moment you sit back down, all from the lock screen. Bluetooth proximity. Forget to arm it? Rex does it for you. WatchDog Key automatically arms your Mac when you walk away and disarms it when you return. Live protection status. See at a glance whether your Mac is paired, online, and protected. Alert history. Every event Rex has flagged, kept in one place so you can review what happened and when. Simple pairing. Scan a QR code once and your Mac and iPhone are linked. — How it works — WatchDog Key pairs with WatchDog on Mac via Bluetooth. Install WatchDog on your Mac, scan the QR code shown there, and you're connected. — Premium subscription — WatchDog Key offers an optional Premium subscription (monthly or yearly) that unlocks full protection: tamper alerts, remote arm/disarm, and automatic Bluetooth proximity locking. Subscriptions are purchased through Apple and renew automatically until cancelled. No account is required to subscribe. — Privacy first — We don't access your files, your screen, or the contents of your Mac. WatchDog Key only handles the signals needed to alert you and let you control Rex. Read our full privacy policy at watchdogapp.de. Built by LA Software UG in Germany. Terms of Use (EULA): https://watchdogapp.de/terms-of-use Privacy Policy: https://watchdogapp.de/privacy
Screenshots
Verdict
The clearest difference is in-app purchases: BFOUR at none against WatchDog Key's 2. BFOUR also leads on update cadence (monthly vs every 4 months) and iOS requirement (13.0 vs 17.0). On price, ads and device support 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. WatchDog Key sells 2 in-app purchases, starting at $2.99 per month. BFOUR asks for nothing beyond the download.
BFOUR ships an update monthly, WatchDog Key every 4 months. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.
| Parameter | BFOUR | WatchDog Key |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (5 ratings) — better | — |
| Number of ratings | 5 — better | — |
| Update frequency | Monthly — better | Every 4 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 13.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 61 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | BFOUR | LA Software |
In-app purchases
BFOUR
No in-app purchases
WatchDog Key
- WatchDog Premium · Monthly$2.991 Month
- WatchDog Premium · Yearly$24.991 Year









