MudWatt Explorer vs GLOBE Observer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MudWatt Explorer
This app helps you track the power output and bacteria population of your MudWatt device. It provides graphical data, allows sharing, and includes an educational comic about microbial life. Unlock new story chapters by achieving higher power and population levels.
- Measure and track MudWatt power
- Estimate and track bacteria population
- Record and share power data
- Educational comic about microbes
- Unlock comic chapters with progress
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MudWatt Explorer brings your MudWatt to life! Track your power and bacteria population and learn what it's like to be bacteria in this muddy world! Details below! The app detects the power of your MudWatt by reading how fast the MudWatt's light is blinking. It also estimates your bacteria population based on that power measurement and gives you a graphical representation of that population. Just line up the blinking light inside the target and voilà! Your power measurements are recorded and graphed. You can even email your data to yourself for further analysis, or to your friends, parents, or teachers. The app also features a fun and educational comic of a growing community of electric bacteria trying to survive in this crazy muddy world. Unlock new chapters of the comic by reaching new power and microbe population levels with your MudWatt! Feature Summary: - Measure and track your MudWatt's power and bacteria population - Record, view, and share your MudWatt's power data - Learn about the muddy world of microbes with an entertaining illustrated story - Unlock new chapters of the story as your MudWatt's power grows
GLOBE Observer
Contribute to real scientific research by making environmental observations. Document clouds, mosquito habitats, land cover, and trees using your mobile device. Your data supports scientists worldwide, including NASA and NOAA.
- Make environmental observations
- Document clouds
- Map mosquito habitats
- Record land cover
- Measure tree height
- Contribute to scientific research
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The GLOBE Observer app enables you to make observations of your environment. GLOBE Observer is the app of the Global Learning and Observations to Benefit the Environment (GLOBE) Program. The GLOBE Program is an international science and education program that provides students and people of all ages worldwide with the opportunity to participate in data collection and the scientific process, and contribute meaningfully to our understanding of the Earth system and global environment. By using the GLOBE Observer app, you contribute scientific data to your community, students and scientists worldwide, including researchers at NASA, NOAA, and other science research institutions. GLOBE Observer allows all users to contribute observations of clouds, mosquito habitats, land cover, and trees. Trained and certified users can also use the app to submit additional environmental measurements from all GLOBE protocols. GLOBE Clouds allows observers to make regular observations of Earth’s cloud cover and compare them to satellite observations. With GLOBE Mosquito Habitat Mapper, users locate mosquito habitats, observe and identify mosquito larvae, and reduce the potential threat of mosquito borne disease. GLOBE Land Cover is designed to allow users to document what is on the land (trees, grass, buildings, etc.). GLOBE Trees asks users to estimate a tree’s height by taking pictures of trees with their device and answering a few questions. Additional capabilities may be added. Visit us at https://www.globe.gov and https://observer.globe.gov.
Screenshots
Verdict
The clearest difference is rating: GLOBE Observer at 3.1 against MudWatt Explorer's 2.8. GLOBE Observer also leads on update cadence (every 2 months vs every 6 months) and ratings volume (86 vs 14). MudWatt Explorer's advantage is iOS requirement (8.0 vs 13.0). On price, ads, in-app purchases and monetization model 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.
GLOBE Observer holds the better App Store score, 3.1 against 2.8. That said, the two scores are not equally well evidenced: GLOBE Observer has 86 ratings behind it against 14, so its average is the more settled of the two. Written reviews point the same way: 25% of MudWatt Explorer's written reviews are positive against 34% of GLOBE Observer's.
MudWatt Explorer ships an update every 6 months, GLOBE Observer every 2 months. The most recent releases landed on October 5, 2026 and October 8, 2026 respectively.
| Parameter | MudWatt Explorer | GLOBE Observer |
|---|---|---|
| Price | Free | Free |
| Rating | 2.8 (14 ratings) | 3.1 (86 ratings) — better |
| Positive reviews | 25.0% of reviews | 33.9% of reviews — better |
| Number of ratings | 14 | 86 — better |
| Update frequency | Every 6 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 8.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 100 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Trygve Enterprises LLC | NASA |
Customer experience
MudWatt Explorer
GLOBE Observer
Bugs and requests
MudWatt Explorer
Not enough reviews yet to summarise bugs or requests.
GLOBE Observer
Reported bugs
39 issues- Checking for updates loop
- 504 error on account creation
- Fails after step 5 in account creation
- Robot verification loop
- App crashes on opening
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- Observations not submitting (error exclamation mark)
- Interminable in-app required update
- Errors in data entry, observations not sending/deleting
- Invalid password errors
- Cloud observation chart images disappear
- No reply from support
- App doesn't open on iPhone
- Won't update
- Logged out, wrong password, account locked
- Data lost after system crash
- Cloud ID chart not loading properly
- Observations keep loading forever
- iPhone stuck on installing updates
- App crashes and never fully loads
- Can't get photos to upload
- User interface poorly designed
- No observations shown when there are
- No way to export data
- App is forever 'installing updates'
- Camera portion of data collection quit working
- No way to submit a report from 'Pictures'
- Compass won't calibrate
- Photo feature locks screen
- No button to take photo
- App crashes if location is not set
- Updates take too long
- Photo submission portal hopeless
- Native camera app has no prompts to submit photos
- 'Done' button does nothing
- 401 unknown error when sending reports
- App goes bonkers when attaching photo
- Screen flickers rapidly when attaching photo
- Cannot get out of camera within app
- Whirring wheel for update in progress for hours
Requested features
8 requests- Improve UI/UX design
- Add dark mode
- Better translation
- Notifications for satellite flyovers
- Integrate with WorldView or Google Earth
Show 3 moreShow fewer
- More explanation/examples for cloud types
- Export data in spreadsheet/GPS format
- Allow users to contribute design improvements
In-app purchases
MudWatt Explorer
No in-app purchases
GLOBE Observer
No in-app purchases









