CO2 Tracker vs Be Underwater
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CO2 Tracker
Calculate the carbon dioxide output of your flights by entering your departure and arrival cities. Understand the environmental impact of your travel and make more responsible decisions to help protect the planet.
- Calculate flight CO2 output
- Enter departure and arrival cities
- Select from 40 aircraft types
- Determine flight distance
- View percentage of annual safe CO2 output
Read full descriptionHide full description
Have you ever wondered if your travel habits take a toll on the environment? Now, you can find out! CO2 Tracker allows you to calculate the carbon dioxide output for any flight between any two places, using a few simple steps. Enter your starting and ending cities, select from a list of 40 different aircraft, find out your flight distance, and then, your carbon dioxide output. The app also tells you what percentage of your total annual safe CO2 output the flight's emissions will constitute. CO2 Tracker can help you determine the potentially harmful environmental effects of your travels, and hopefully, can guide you to make responsible travel decisions in the future. Let's save the planet! This app works best with your screen in portrait orientation.
Be Underwater
Discover and book dive courses, trips, and liveaboards worldwide. Compare prices, itineraries, and operators for your next underwater adventure. Find the perfect dive sites and plan your diving experiences easily.
- Book dive courses worldwide
- Find liveaboard trips
- Compare dive site destinations
- Compare prices and operators
- Save favorite adventures
- Interactive dive map
Read full descriptionHide full description
The world's best dive sites, scuba courses, fun dives and liveaboards are one tap away. Be Underwater brings together certified dive centers and liveaboard operators from around the world, making it easy to compare, plan and book your next underwater adventure. Whether you're trying scuba for the first time or working towards becoming a Dive Instructor, everything you need is in one place. FIND THE PERFECT COURSE Browse courses for every level, from Snorkel and Open Water to Advanced, Rescue, Divemaster and Instructor. Every listing includes pricing, duration, language options, requirements and what's included, so you can compare before you book—without sending countless emails to different dive centers. BOOK LIVEABOARDS AROUND THE WORLD Discover unforgettable liveaboard trips to some of the planet's most iconic dive destinations. Compare itineraries, prices and operators, then book your next multi-day diving adventure with confidence. DISCOVER THE WORLD'S BEST DIVE DESTINATIONS Explore incredible dive sites with ratings, reviews and destination guides from around the globe. Use the interactive dive map to find nearby diving or plan your next trip—whether it's the Great Barrier Reef, the Red Sea, the Maldives, Galápagos or a hidden local gem. COMPARE PRICES. BOOK INSTANTLY. Compare prices from certified dive centers side by side, then book scuba courses, fun dives and specialty certifications like Nitrox or Deep Diver in seconds. Fast, transparent and hassle-free. SAVE YOUR NEXT ADVENTURE Create your personal dive bucket list by saving your favorite destinations, dive centers, courses and liveaboards. Everything is ready whenever you're ready to dive. Whether you're a complete beginner or an experienced diver, Be Underwater is your all-in-one platform to discover dive destinations, compare dive centers, book scuba courses, reserve fun dives and find incredible liveaboards worldwide. Dive more. Plan less. Download Be Underwater today—it's free. Terms of Use: https://www.beunderwater.com/terms Privacy Policy: https://www.beunderwater.com/privacy
Screenshots
Verdict
The clearest difference is ads: CO2 Tracker at none against Be Underwater's shown. CO2 Tracker also leads on monetization model (free vs free with in-app purchases) and ratings volume (3 vs 1). Be Underwater's advantage is update cadence (every 10 days vs every 3 months). On price, rating, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for CO2 Tracker against 5.0 for Be Underwater. Both are backed by a comparable volume of ratings — 3 and 1 respectively.
CO2 Tracker ships an update every 3 months, Be Underwater every 10 days. The most recent releases landed on October 15, 2026 and October 2, 2026 respectively.
| Parameter | CO2 Tracker | Be Underwater |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) | 5.0 (1 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 3 — better | 1 |
| Update frequency | Every 3 months | Every 10 days — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 12.1 — better | 15.1 |
| Further details — not scored | ||
| Size | 11 MB | 45 MB |
| Age rating | 4+ | 4+ |
| Developer | Madhu Raghavan | Eliana Jordan |
Customer experience
CO2 Tracker
Be Underwater
In-app purchases
CO2 Tracker
No in-app purchases
Be Underwater
No in-app purchases
Questions
Is CO2 Tracker free?
Is Be Underwater free?
Which has better reviews, CO2 Tracker or Be Underwater?
Do CO2 Tracker or Be Underwater have ads?
Which is updated more often, CO2 Tracker or Be Underwater?
Other comparisons
