Comparison

CO2 Modeller vs KORG GEC5 Controller

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

Head to head
About

CO2 Modeller

Simulate the impact of reducing carbon emissions on climate change. This app generates projections for atmospheric CO2 concentration, global warming, sea level rise, and ocean acidification.

Highlights
  • Model carbon emission reductions
  • Simulate climate change effects
  • Project CO2 concentration
  • Estimate global warming
  • Predict sea level rise
  • Analyze ocean acidification
Features
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Model the effect of carbon emissions reductions on climate change using your smartphone or tablet. CO2 Modeller uses a streamlined computationally efficient Earth system model to simulate the effect of carbon emissions reductions on climate change. It generates twenty-first century projections of atmospheric carbon dioxide concentration and global averages of surface warming, sea level rise and ocean acidification.

About

KORG GEC5 Controller

This software provides a comprehensive system for group instruction in music, language, or technology labs. It offers flexible modes for lectures, individual practice with teacher eavesdropping, and collaborative group work, enhancing classroom efficiency and engagement.

Highlights
  • Multiple practice and instruction modes
  • Fully-digital stereo sound
  • Intuitive software user interface
  • Flexible audio routing
  • Open curriculum compatibility
  • Lecture, Practice, and Group modes
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GEC5 Lab System Controller The Korg Group Education Controller (GEC5) represents the most advanced system in group instruction technology. With an intuitive, easy-to-use software user interface, multiple practice and instruction modes, fully-digital stereo sound - the Korg GEC5 Lab System will take any music, language or technology lab to a new level of high efficiency and create a superior classroom experience. The advanced, yet easy-to-use audio routing in the GEC5 is compatible with any digital audio signal, so get creative and build a room with any combination of electronic instruments including digital pianos, guitars, synthesizers, and even MIDI-controlled software instruments. Want to do even more? Integrate computers with your lab and take learning to a new level of excitement and capability. Unlike other systems, the Korg GEC5 is completely open and allows you to use any curriculum that suits your classroom best. The sky is the limit! For over 20 years Korg has worked extensively with educators all over the world with overwhelming success in thousands of music, language and technology labs. This expertise in educational technology has led to the development of the Korg GEC5 Lab System - the most user-friendly, flexible and powerful lab control system available. Software Control Application MULTIPLE MODES MEAN FLEXIBILITY There are three main modes of GEC5 operation. Each of these can be selected within the software interface at the teacher’s station: Lecture Mode: Present material and instruction in a lecture format. All students hear the teacher’s microphone and instrument or computer allowing for a captive and quiet audience. - Tap the Student Instrument/Student Stations button and allow the students to play along. - Tap and hold to exclude a student from the lecture for independent work. - Double tap to bring a student into the lecture for comments or questions. Practice Mode: Practice mode is used when the students are working independently. Each student hears only his or her own instrument or computer. In Practice Mode, the teacher has the option of “eavesdropping” on the student and initiating 2 way communication with the student for individualized instruction. - Double-tap to eavesdrop, double-tap again to talk - Tap All Call to call attention to the group - Single tap to clear eavesdrop - Performance Mode allows the teacher to hear all of the students and their instruments at the same time while each student can only hear themselves, their instrument and the teacher’s audio. Group Mode: This mode is used when students are working together in groups (two or more student workstations in any conceivable configuration). Each student in a group can hear his or her own instrument as well as the instruments or computer and microphone of the other members of their group. - Tap and hold to select students to put in a group, then select New Group - Recall Auto Group Presets - Make your own custom presets for each class *This app must be used with the GEC5 hardware system available from an authorized Korg Dealer. http://www.korg.com/us/products/audio/gec5/index.php

Screenshots

CO2 Modeller4 screens

Verdict

The call

The clearest difference is review sentiment: CO2 Modeller at 75% against KORG GEC5 Controller's 25%. CO2 Modeller also leads on device support (3 vs 1). KORG GEC5 Controller's advantage is rating (5.0 vs 2.5) and update cadence (every 11 months vs every 36 months). On price, ratings volume, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

KORG GEC5 Controller holds the better App Store score, 5.0 against 2.5. Both are backed by a comparable volume of ratings — 2 and 4 respectively. Written reviews complicate that: 75% of CO2 Modeller's written reviews are positive against 25% of KORG GEC5 Controller's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

CO2 Modeller ships an update every 36 months, KORG GEC5 Controller every 11 months. The most recent releases landed on October 19, 2026 and October 22, 2026 respectively.

Scorecard4 real differences · 6 level
CO2 Modeller versus KORG GEC5 Controller: the parameters behind the verdict, then further details
ParameterCO2 ModellerKORG GEC5 Controller
PriceFreeFree
Rating2.5 (2 ratings)5.0 (4 ratings) — better
Positive reviews75.0% of reviews — better25.0% of reviews
Number of ratings24 — better
Update frequencyEvery 36 monthsEvery 11 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPad
Requires iOS12.111.0 — better
Further details — not scored
Size9 MB22 MB
Age rating4+4+
DeveloperAlex RogersKORG INC.

Customer experience

CO2 Modeller

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews4 reviews
Positive75.0%
Neutral0.0%
Negative25.0%

KORG GEC5 Controller

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive25.0%
Neutral0.0%
Negative75.0%

In-app purchases

None

CO2 Modeller

No in-app purchases

None

KORG GEC5 Controller

No in-app purchases

Questions

Is CO2 Modeller free?
CO2 Modeller is free to download, with no in-app purchases.
Is KORG GEC5 Controller free?
KORG GEC5 Controller is free to download, with no in-app purchases.
Which has better reviews, CO2 Modeller or KORG GEC5 Controller?
KORG GEC5 Controller is rated higher. CO2 Modeller averages 2.5 out of 5 from 2 ratings, while KORG GEC5 Controller averages 5.0 from 4 ratings.
Do CO2 Modeller or KORG GEC5 Controller have ads?
Neither CO2 Modeller nor KORG GEC5 Controller shows ads.
Which is updated more often, CO2 Modeller or KORG GEC5 Controller?
CO2 Modeller ships an update every 36 months, and KORG GEC5 Controller every 11 months. Most recently, CO2 Modeller was updated on October 19, 2026 and KORG GEC5 Controller on October 22, 2026.

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