AtmostropicOpen app ↗Atmosphere
Explore temperature, pressure, density, sound speed, and viscosity with the US76 atmosphere model.
US76 lower-atmosphere model · implemented to 84.852 km geometricA little curiosity. A whole atmosphere.
Air in motion.
Compressible calorically perfect gas laws with atmospheric models make aeronautical relationships tangible in Atmostropic.
Runs in your browser · Calculations stay on your device
ATMOSPHERE / FLOW / DISCOVERYBuilt for curious minds
Atmostropic is provided exclusively for education, personal learning, and entertainment. Read the EULA
01 / Explore
Go where the wind blows.
One place to explore atmospheric properties and the relationships that shape compressible flow.
Compressible flow
Investigate isentropic flow, normal and oblique shocks, conic flow, and duct processes.
Relationships you can exploreRun anywhere
When installed as an app, it will run anywhere, even a black hole.
Browser + installed webappHow to install as a persistent app
First, open Atmostropic in your device’s browser. Install from the calculator page.
- Desktop Chrome: Select the install icon in the address bar, then confirm installation.
- Android Chrome: Open the three-dot menu, choose Install and create shortcut (or Add to home screen), then Install.
- iPhone or iPad (Safari): Open the Share menu, choose Add to Home Screen, then tap Add. Leave Open as Web App enabled if shown.
Launch the installed app while online, accept the EULA, and wait for Available offline in General information before disconnecting. Updates and support messages need an internet connection. Menu wording varies by browser and device.
Active development
Atmostropic is actively evolving. Follow the release history to see changes, improvements, and the work behind each version.
Follow developmentThe app includes verification and validation reports with their scope and limitations. It is not a certified engineering or design tool.
02 / Releases
A clear view
of what changed.
Version history comes from the same published release record used by the app.
Current versionLoading…
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The app’s General tab shows available software updates. An offline copy needs a connection to receive a new version.
03 / Open source
US76, in your language.
Standalone atmosphere implementations. Each download includes its source, documentation, and MIT license.
Verification information can be viewed here.
The MIT license applies to these language ports; the Atmostropic app has separate terms.
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Total download requests are tracked; no identifying data is collected by the download counter. Verification labels describe the retained checkpoint, not certification.
04 / Our approach
Free. Transparent.
Private by design.
Space to explore aeronautical science, with clear terms and calculations that stay on your device.
Explore Atmostropic ↗Free to explore
Use Atmostropic for education, personal learning, and entertainment without a subscription or account.
Transparent about work
Read the release history, inspect the MIT-licensed US76 source, and explore verification reports that state their methods and limitations.
Your calculations stay yours
Calculator inputs and results are processed on your device. No advertising or calculator-usage tracking is added. Source download requests are counted only as aggregate totals. Support uses an anonymous in-app chat without an account or email address.
Privacy does not mean zero network traffic: app resources and updates need a connection, and hosting providers can log connection information, including IP addresses. Support is available through the app’s Support tab. Read the webapp privacy statement.