Birdathon vs Science Calc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Birdathon
This app helps birdwatchers create and organize detailed checklists of their observations. It automatically records time and location, allowing for easy editing and customization. Users can visualize their sightings on maps, add field notes, and export data for sharing or further analysis.
- Observation-centric checklists
- Automatic time and location recording
- Customizable maps with boundary overlays
- Field notes for additional observations
- Multiple checklist sorting options
- Data export to CSV and other formats
- Create checklist templates
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Birdathon is an observation-centric tool for creating birding checklists. It helps you organize your checklists and share them with others. Use Birdathon in the field to quickly record whether and where a bird is seen or heard and the number observed. The time and location of each observation is automatically recorded. You can adjust the location, time entries and the count of birds observed at any time to ensure your records are accurate. You can add breeding codes to your observations. Checklist maps display the locations of your observations. You can overlay county boundaries for every US state. You can add a range circle such as a 5MR (5-mile Radius) to your maps. You can import and overlay custom kml/kmz files onto your maps. An Overview feature lets you see your combined observations for any time period, and displays a map showing any boundaries you have selected, so you can utilize the map feature even when you are not actively checklisting. You can export Overview data into a csv text file or create a new checklist template from the Overview. Your checklists can be viewed in taxonomic order, alphabetically, by rarity or as a timeline of species. You can enrich your checklist with field notes and add observations such as mammals, butterflies, wildflowers, etc., to make it a more complete record of your experience. You can organize your checklists into categories such as Day List, Year List, County List, Life List, etc., and assign color themes to your lists. Bird species may be added and deleted from your lists at any time. You can create new checklist templates from your previous lists or import templates created by others. You can change which template is being used. You can import text files into Birdathon, making them into templates or new checklists. Different export options for your checklists allow you to import into eBird or another copy of Birdathon. The bird species source data and other resources used in this app come from the following sources: AviList, a unified global checklist of birds, is the core data set used for Birdathon. https://www.avilist.org. Some data has been integrated from the following sources: The eBird/Clements checklist of birds of the world (https://www.birds.cornell.edu/clementschecklist/download/), the American Ornithological Society's (AOS) Checklist of North and Middle American Birds (https://checklist.americanornithology.org), and the American Birding Association's (ABA) checklist of North American Birds (https://www.aba.org/listing-taxonomy/) Alpha codes come from The Institute for Bird Populations’ Standardized 4- and 6-letter Bird Species Codes. https://www.birdpop.org/pages/birdSpeciesCodes.php. County boundary data is from the United States Geological Survey (USGS) TIGER/Line 2019 Shapefiles found on the United States Census Bureau's website at https://www.census.gov/geographies/mapping-files/time-series/geo/tiger-line-file.2019.html. Boundaries should be used as general guidelines and not be considered precise. Note especially where county boundaries follow creeks, rivers, ridge lines and other natural features, and so are of much finer resolution than can be shown on Birdathon’s maps. California breeding bird atlas blocks come from the California Bird Atlas, https://www.californiabirdatlas.org. California Bird Atlas logo and breeding code descriptions used with permission.
Science Calc
This app simplifies complex science calculations with handy formulas and simulations. It offers features like wavelength, frequency, and velocity calculations, plus a nuclear bomb blast radius simulator. Enjoy a dark mode for late-night study sessions.
- Wavelength, Frequency, Velocity Calculator
- Nuclear Bomb Blast Radius Simulator
- Half Life Computation
- Atomic Mass Calculation
- Volume and Surface Area Calculator
- Logarithm Equation Solver
- Dark Mode
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A super handy way to save time on all those lengthy Science class formulas! And of course, it has Dark Mode for those late night study sessions! Now Supports Calculating: - Wavelength, Frequency, and Velocity - Nuclear Bomb Blast Radius (with a Built in Simulator) - Half Life Computation - Protons & Neutrons (plus Atomic Mass) - Volume and Surface Area of Objects - Number to Logarithm Equation - with more on the way! This project was developed by an aspiring high school student as a mini project for Physics class, hope you like it! And feel free to contact me if you find any bugs!
Screenshots
Verdict
The clearest difference is in-app purchases: Science Calc at none against Birdathon's 4. Science Calc also leads on update cadence (every 5 days vs every 4 months) and rating (5.0 vs 4.7). Birdathon's advantage is ratings volume (15 vs 3). On price, ads, monetization model 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. Birdathon sells 4 one-off in-app purchases. Science Calc asks for nothing beyond the download.
Science Calc holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Birdathon has 15 ratings behind it against 3, so its average is the more settled of the two.
Birdathon ships an update every 4 months, Science Calc every 5 days. The most recent releases landed on September 19, 2026 and June 3, 2026 respectively.
| Parameter | Birdathon | Science Calc |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (15 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 15 — better | 3 |
| Update frequency | Every 4 months | Every 5 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 16.1 | 15.0 — better |
| Further details — not scored | ||
| Size | 192 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Barry Langdon-Lassagne | Luke Drushell |
Customer experience
Birdathon
Science Calc
In-app purchases
Birdathon
- Good Tip$0.99
- Great Tip$1.99
- Amazing Tip$2.99
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- Incredible Tip$4.99
Science Calc
No in-app purchases






