iSeismometer vs RiSet Sky

iSeismometer turns your iPhone or iPad into a seismograph. Set it on a table, tap the desk, and watch the ground move. You will be surprised how sensitive your phone is. It has been doing that since the App Store opened in 2008, when it reached #1 in Education in Japan, Austria, Finland, and Greece. Version 1.7 is a complete rebuild: faster, clearer, and finally a real instrument. LIVE SEISMOGRAPH • Three axes at up to 100 samples per second, drawn like a strip-chart recorder • Scroll back through up to an hour of history while it keeps recording • Gravity filter with a real corner frequency, so slow tilt disappears and earthquakes stay • Live spectrum: see the frequency of footsteps, a washing machine, or a passing truck at a glance • Dark mode and a full iPad layout EVENT DETECTION • A seismologist's STA/LTA trigger flags every tremor with its peak acceleration, duration, and dominant frequency • Three sensitivity levels, from "only real shakes" to "every footstep" • Events are shaded on the traces and listed so you can jump straight to them RECORDINGS • Every session is saved automatically as compact raw data, split into hourly files • Browse by day, open any recording, scrub to its events, and see its spectrum • Export CSV, or pick up the raw files in the Files app and in Finder • Keep them for a day, a week, a month, or forever WAS THAT AN EARTHQUAKE? • Live USGS feed on a globe, filtered by time window and magnitude • Tap a quake for its depth, time, and the official USGS page STREAM TO YOUR MAC • Open iSeismometer on a Mac on the same Wi-Fi and your phone finds it by itself • The Mac shows every device streaming to it side by side, with its own recordings and event detection • Reconnects on its own after the screen locks, the network drops, or the Mac restarts Made for fun and for learning. A phone carries a MEMS accelerometer, not a broadband seismometer, so it feels footsteps and trucks far better than distant earthquakes. Put it on a solid floor, plug it in, keep the screen awake, and you have a home seismic station. iSeismometer is not a substitute for official earthquake early warnings or emergency alerts. Questions and ideas: info@objectgraph.com "This is a novelty app but one that also helps you learn something new... one of those things that is very captivating once you've looked at it once." — The Independent Guide to the iPhone 3GS

RiSet Sky: Essential sky information at a glance, right when you need it. Created by a professional astronomy educator for amateur astronomers, astronomy communicators, and curious observers, RiSet Sky puts the essential information about our celestial neighborhood and the International Space Station right at your fingertips. Know when the Sun, Moon, and planets rise, set, and transit, with information for both the date you are observing and the following day. Quickly see an object's current constellation location, apparent magnitude, angular size, and transit altitude, all in a clear, concise format designed for real-world observing. Explore Our Celestial Neighborhood Select the Sun, Moon, or any planet for a detailed observing profile. For Jupiter and Saturn, RiSet Sky shows the relative positions of their brighter moons, helping you know what to expect before you begin observing through an eyepiece. Select the Moon for additional information including its current phase, illumination percentage, rise and set times, angular size, as well as the date for upcoming Full and New Moons. For the Sun, RiSet Sky also provides a daily assessment of solar activity. Track the International Space Station RiSet Sky makes ISS observing simple. See upcoming rise and set times, visible duration, and future passovers. When an ISS opportunity is approaching, a single tap activates an observing aid that helps you determine where to look in the sky, accompanied by a convenient countdown timer. Built for Observers and Educators RiSet Sky was created around the things astronomers consider and the questions they hear from others: When can I see it? Where will it be? How high will it get? How bright is it? What should I expect to see? Whether you are planning an observing session, preparing an astronomy program, working with the public, or simply curious about the objects closest to us in space, RiSet Sky brings the essential information together in one clear, concise observing companion. Less time searching. More time looking up. RiSet Sky — Rise. Set. Observe.