Comparison

rotronic vs ColorMetric

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

Head to head
About

rotronic

Features
Read full description

A comprehensive portfolio that includes handheld instruments, measurement transmitters, industrial sensors, OEM products and data loggers. Rotronic measuring devices do service in the most varied areas of application: the pharmaceutical/foodstuff industries, ventilation/air-conditioning equipment, drying processes and measurement of moisture in paper, as well as in meteorology. From us, you buy guaranteed safety: validated software, and an officially accredited, GAMP/FDA conform calibration centre, and profit from a global sales and service network.

About

ColorMetric

Features
Read full description

Water Testing, Perfected for Your Eyes and Your Environment. Are you tired of squinting at paper charts trying to decide if your Nitrate is 10 or 20? ColorMetric transforms your iPhone into a professional-grade colorimeter. Designed for both freshwater enthusiasts and reef-keepers, our app eliminates the subjectivity of traditional testing. What makes ColorMetric different? Intelligent Lighting Calibration: Room lighting often distorts colors. ColorMetric allows you to calibrate the app to your specific environment, ensuring your camera "sees" the same color every time, regardless of whether you’re under LEDs or sunlight. Individual Card Calibration: Every test kit brand has slight variations. You can calibrate the app to your specific test cards for unparalleled accuracy. Guided Test Assistant: Never botch a 5-minute wait again. The app walks you through every step of the testing process with integrated timers and clear instructions for every parameter. Dual Environment Support: Specialized profiles for Saltwater and Freshwater aquariums, covering everything from pH and Ammonia to high-sensitivity Reef parameters like Phosphate and Magnesium. A Healthier Tank Starts with Better Data Accuracy is the difference between a thriving ecosystem and a crash. ColorMetric bridges the gap between affordable liquid tests and expensive digital monitors, giving you the precision you need at a fraction of the cost. Download ColorMetric today and stop guessing. Privacy Policy URL: https://colormeter.web.app/privacy-policy.html Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

rotronic4 screens
ColorMetric4 screens

Verdict

The call

The clearest difference is in-app purchases: rotronic at none against ColorMetric's 1. rotronic also leads on iOS requirement (8.1 vs 17.0). ColorMetric's advantage is update cadence (weekly vs monthly). On price, ads and device support there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. ColorMetric sells 1 in-app purchase, starting at $9.99 per year. rotronic asks for nothing beyond the download.

UpkeepUpdate frequency

rotronic ships an update monthly, ColorMetric weekly. The most recent releases landed on October 8, 2026 and October 11, 2026 respectively.

Scorecard3 real differences Β· 3 level
rotronic versus ColorMetric: the parameters behind the verdict, then further details
ParameterrotronicColorMetric
PriceFreeFree
Update frequencyMonthlyWeekly β€” better
AdsNoNo
In-app purchasesNo β€” betterYes
DevicesiPhone, iPod β€” betteriPhone
Requires iOS8.1 β€” better17.0
Further details β€” not scored
Size5 MB6 MB
Age rating4+4+
DeveloperRotronic AGLance Zukel

In-app purchases

None

rotronic

No in-app purchases

1 purchases

ColorMetric

Subscriptions1
  • ColorMetric Annual Ad Free$9.991 Year

Questions

Is rotronic free?
rotronic is free to download, with no in-app purchases.
Is ColorMetric free?
ColorMetric is free to download, with in-app purchases available.
Do rotronic or ColorMetric have ads?
Neither rotronic nor ColorMetric shows ads.
Which is updated more often, rotronic or ColorMetric?
rotronic ships an update monthly, and ColorMetric weekly. Most recently, rotronic was updated on October 8, 2026 and ColorMetric on October 11, 2026.

Other comparisons