Comparison

iCelsius vs Phone Tester

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Live temperature display
  • Temperature graphing with pan/zoom
  • Configurable temperature alarms
  • Snapshot and continuous recording
  • Recipe presets for cooking
  • History of recorded readings
Features
Read 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.

About

Phone Tester

Test your device's hardware and screen functionality. Get detailed device information and generate a shareable PDF report of your tests.

Highlights
  • Hardware component testing
  • Screen tap and swipe gesture tests
  • Device information display
  • Test report generation
  • Shareable PDF reports
Features
Read full description

App Features : Hardware : Allows you to check your Camera, Flash, Vibration, Microphone, Speaker, Brightness, Ports, 3D Touch, FingerLock, FaceLock, Sensors and Buttons etc. You can perform the check and Choose that whether you are satisfied with the check or not satisfied. The chosen answer will be used in the report screen. Screen : These tests allows you to perform multiple test like One, two, three and multiple tap. You can test the swipe gestures by performing swipe gestures in the view. You can test single tap, double tap and pinch and zoom features as well. Device Information : Represents the device information like your device name, device model, os version which your device is operation and battery information with ram and storage capacity. Also you can check the internet status along with wifi and bluetooth enabled or disabled. Report : Report of the check your have carried with your chosen answer. Report contains the device main information like your device model, front and rear camera information, your device operating system, ram and storage capacity, battery percentage and your device resolution. Information about the hardware check performed with your chosen options and a share option which shares the pdf copy of the test report.

Screenshots

iCelsius2 screens
Phone Tester4 screens

Verdict

The call

The clearest difference is in-app purchases: iCelsius at none against Phone Tester's 1. iCelsius also leads on ads (none vs shown) and update cadence (every 2 months vs every 10 months). On price, rating, review sentiment 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Phone Tester sells 1 one-off in-app purchase. iCelsius asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.2 for iCelsius against 4.3 for Phone Tester. That said, the two scores are not equally well evidenced: iCelsius has 136 ratings behind it against 16, so its average is the more settled of the two. Written reviews are what separate them: 36% of iCelsius's written reviews are positive against 38% of Phone Tester's.

UpkeepUpdate frequency

iCelsius ships an update every 2 months, Phone Tester every 10 months. The most recent releases landed on October 20, 2026 and October 24, 2026 respectively.

Scorecard5 real differences · 5 level
iCelsius versus Phone Tester: the parameters behind the verdict, then further details
ParameteriCelsiusPhone Tester
PriceFreeFree
Rating4.2 (136 ratings)4.3 (16 ratings) — better
Positive reviews36.0% of reviews38.5% of reviews — better
Number of ratings136 — better16
Update frequencyEvery 2 months — betterEvery 10 months
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better13.0
Further details — not scored
Size41 MB26 MB
Age rating4+4+
DeveloperAginova SarlKushal Patel

Customer experience

iCelsius

All ratings139 ratings
Positive81.3%
Neutral5.0%
Negative13.7%
Written reviews150 reviews
Positive36.0%
Neutral10.0%
Negative54.0%

Phone Tester

All ratings16 ratings
Positive87.5%
Neutral6.3%
Negative6.3%
Written reviews13 reviews
Positive38.5%
Neutral15.4%
Negative46.2%

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 more
  • 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 more
  • 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

Phone Tester

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

iCelsius

No in-app purchases

1 purchases

Phone Tester

One-time1
  • ad-free version$7.99

Questions

Is iCelsius free?
iCelsius is free to download, with no in-app purchases.
Is Phone Tester free?
Phone Tester is free to download, with in-app purchases available.
Which has better reviews, iCelsius or Phone Tester?
Phone Tester is rated higher. iCelsius averages 4.2 out of 5 from 136 ratings, while Phone Tester averages 4.3 from 16 ratings.
Do iCelsius or Phone Tester have ads?
Phone Tester shows ads; iCelsius does not.
Which is updated more often, iCelsius or Phone Tester?
iCelsius ships an update every 2 months, and Phone Tester every 10 months. Most recently, iCelsius was updated on October 20, 2026 and Phone Tester on October 24, 2026.

Other comparisons