iCelsius vs SYSMonitor
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iCelsius
Transform your iPhone, iPad, or iPod touch into a digital thermometer with this app. It works with a separate hardware probe to measure temperatures of liquids and other substances, create graphs, and set alerts. Ideal for cooking, science education, and quality control.
- Live temperature display
- Temperature graphing with pan/zoom
- Configurable temperature alarms
- Snapshot and continuous recording
- Recipe presets for cooking
- History of recorded readings
Read full descriptionHide full description
Extend your Smartphone, Sense the World. The iCelsius is a temperature probe that turns the iPhone, iPad or iPod touch into a digital thermometer. IMPORTANT - Requires separate hardware available from http://www.icelsius.com to operate. The app can work in demo mode if no probe is connected. Compatible with wired and wireless (Wi-Fi) iCelsius probes! The current app downloaded from the App store will read temperature, create graphs and set up alerts. Please visit our website www.icelsius.com for more information! A stainless steel tip makes it possible to measure liquid temperatures such as baby formula, cooking ingredients, wine, tea, household appliances and hundreds of other applications. Can also be used in school or for teaching science, for equipment calibration, food quality control, cold chain control. The application is constantly improved based on user feedback. FEATURES • Live Display – shows useful temperature data in one shot • Graphs – with pan and zoom touch support • Alarms – Generate alarms when temperature goes outside a configurable (lower and/or upper) limit. • Snapshot Record – Ability to record a single reading, along with title, picture and note. • Continuous Record – Ability to continuously record readings as well as to add notes, take a picture and drop a pin on the graph. • History – Access all your previous records. • Recipes – For cooking and barbecue, choose preset recipe or create your own. Find more probes & wireless measurement devices on our product website www.icelsius.com and company website website www.aginova.com.
SYSMonitor
Monitor your device's performance with real-time insights into CPU, memory, and storage usage. Track network speed, view detailed device information, and access key metrics directly from your Today widget. Understand your device's health and optimize its performance.
- CPU usage monitoring
- Memory (RAM) status
- Storage (ROM) visualization
- Real-time network speed
- Network details (IP, SSID, Ping)
- Basic device information
Read full descriptionHide full description
*** NEW ***More than just Widget monitoring your iPhone and iPad!!! *** Still thinking about why the phone is so hot,IS the CPU utilization too high? Why the data traffic consumed so quickly? Background processes too much? How much is left of my Storage? The app monitors CPU, MEMORY(RAM), Storage(ROM), Real-time network speed and the other device information. And it can be placed in 'Today' as a widget. Click the widget to get more functions and detailed information about your device. Including: √ Monitor solid color model √, Network # WiFi, DNS, SSID, internal and public network IP address, real-time network speed, Ping test and many other functions. √. Storage(ROM) # Visualization of disk space status and usage. √. CPU # One or more CPU usage updated in real time √. Memory (RAM) # Easy understanding of device memory status. # Visualization of Used, Active, Inactive, Free. √. Basic Info: #Device Name ,Device Model, IOS version, Screen resolution, Memory, Storage, Battery , OpenGL etc.
Screenshots
Verdict
The clearest difference is rating: iCelsius at 4.2 against SYSMonitor's 3.6. iCelsius also leads on in-app purchases (none vs 1) and ads (none vs shown). On price, review sentiment, device support and iOS requirement 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. SYSMonitor sells 1 one-off in-app purchase. iCelsius asks for nothing beyond the download.
iCelsius holds the better App Store score, 4.2 against 3.6. Both are backed by a comparable volume of ratings — 139 and 38 respectively. Written reviews complicate that: 35% of iCelsius's written reviews are positive against 40% of SYSMonitor's, so the app with the better star average is not the one people write more warmly about.
iCelsius ships an update every 2 months, SYSMonitor every 5 months. The most recent releases landed on October 16, 2026 and October 9, 2026 respectively.
| Parameter | iCelsius | SYSMonitor |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (139 ratings) — better | 3.6 (38 ratings) |
| Positive reviews | 35.2% of reviews | 39.9% of reviews — better |
| Number of ratings | 139 — better | 38 |
| Update frequency | Every 2 months — better | Every 5 months |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 41 MB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | Aginova Sarl | 泽辉 王 |
Customer experience
iCelsius
SYSMonitor
Bugs and requests
iCelsius
Reported bugs
33 issues- App crashes on startup
- App crashes when tapping graphs
- Temperature readings are incorrect/flashing
- Live view display is messed up
- App crashes when phone locks or switches apps
Show 28 moreShow fewer
- Connectivity issues (Wi-Fi, Bluetooth)
- Unit not recognized when connected directly
- App crashes on iPhone X
- App crashes on iPad and iPhone
- App crashes repeatedly after latest update
- Device becomes inoperable after update
- Pop-up to download newer version persists
- Probes show infinity or out of range readings
- Wi-Fi connection drops when iPad goes to sleep
- Dual probe app has only one set of alarm points
- App freezes when looking for Wi-Fi
- Unit not supported by iOS device error
- Wire leading to probe not ovenproof
- Recipe function only has high range for one probe
- Degrees C vs F display issues
- Graph display substandard
- App doesn't update temperature when not running
- App doesn't track temperature prior to current session after restart
- Unit never connects to home wireless network
- Temperature gauge no longer reports decimal values
- Recent update makes app useless
- Cannot tell if unit is charged
- Sensor inaccurate out of the box
- Sensor stopped working after a week or two
- App shows wrong temperatures in demo mode
- Graph zoom is useless (cannot zoom out to longer time scales)
- Cannot zoom temp scale without zooming time scale
- App doesn't run under iOS 7
Requested features
18 requests- Fix crashing issues
- Improve Wi-Fi and Bluetooth connectivity
- Ensure compatibility with newer iOS versions
- Improve remote monitoring reliability
- Fix data loss when switching apps
Show 13 moreShow fewer
- Add dual alarm points for dual probes
- Improve recipe function (high range for one probe)
- Fix Celsius/Fahrenheit display issues
- Improve graph display (zoom, time span, temp span)
- Allow background notifications/alarms
- Add ability to call/text on alarm
- Make probes ovenproof
- Improve probe durability/lifespan
- Allow power supply via mini USB
- Separate time and date columns in CSV export
- Allow zooming on temperature scale in graphs
- Make app work without hardware (demo mode improvement)
- Improve documentation for non-techies
SYSMonitor
Not enough reviews yet to summarise bugs or requests.
In-app purchases
iCelsius
No in-app purchases
SYSMonitor
- Permanently Remove ads$1.99









