Monad Calendar Clock vs Learn Acoustics Engineering
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Monad Calendar Clock
This app visualizes time through planetary and celestial movements, contrasting natural rhythms with mechanical time. It offers unique perspectives on Earth's position in space and time, showing star and planet locations, seasonal changes, and lunar phases.
- Planetary time and date display
- Celestial ring visualization
- Heliocentric and Geocentric modes
- Star and planet location tracking
- Seasonal and lunar phase progression
- Twilight and sunrise/sunset times
- Event scheduling
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MONAD does something that no other clock or calendar does; it tells the planetary time and date – the solar day, lunar month & seasonal year. MONAD reveals your unique place (and perspective) in planet-centered space and time. MONAD demonstrates the biorhythms of the Earth’s biosphere, and it integrates two types of time: 1) Natural time, which is cyclic, variable, and alive, with 2) Mechanical time, which is linear, highly regular, abstract and artificial. MONAD represents a paradigm shift of planetary proportions; A New Paradigm of Time With MONAD, you see the natural rhythms of time proceeding in endless circles and spirals. MONAD shows the location of the stars and planets; what’s visible at night from your location on Earth. MONAD shows the progression of the four seasons and the phases of the Moon; the obliquity of the ecliptic and the Earth’s circle of illumination, and a Twilight Dial tells you the time of Sun rise and Sun set at any latitude and time of year. MONAD shows the agricultural biorhythms of the Earth’s photosynthetic biosphere. MONAD restores the Earth, and the Earth’s biorhythms and biosphere, back to the center of our collective attention and awareness. With MONAD you see the Earth globe from an unusual perspective; the north (or south) polar axial perspective. MONAD automatically places a time zone-spanning Hour Hand at your location on the globe, marking your longitude & latitude, and you see all 24 time zones, all around the globe at the same time, the whole world interconnected. MONAD has four main Modes of operation. Geocentric (Geo) Mode features planet Earth at the center of a time and date-telling, 3-dimensional celestial ring. The algorithms and programming which drive all of the astronomical activity is based on a Sun-centered and highly accurate model of the solar system which you can access in Heliocentric (Helio) Mode. Accelerate through time, into the past or future, and watch how the configuration of the solar system changes. Shift back and forth from Geo to Helio Modes, and it’s easy to see how the two perspectives are related. It’s easy to see how and why the planets have apparent retrograde activity from an Earth-centered perspective. There is so much to explore and learn in MONAD. Astro Mode features a 2-dimensional Calendar-Clock face, which makes it possible to set the time by dragging the hour hand around the dial, or you can set the date by dragging the calendar band, or zodiac band, past the Sun’s meridian or date indicator fixed at noon at the top of the dial. A Table at the top of the screen lists the precise location of the Sun, Moon and planets at any time and date, so basically this Astro screen is equivalent to an astronomy or astrology chart, at any moment in time. Astro Mode will eventually feature a Scientific Astrology Program and an Educational Astronomy Program. Event Mode is where you record and schedule personal events, in the context of important and memorable planetary events we all share. Color-coded Event Wedges are shown in the context of the 4 corners of a solar day (Sun rise, noon, Sun set & midnight), the 4 corners of a lunar month (full and dark Moon, waxing and waning half Moons), and the 4 corners of a seasonal year (equinoxes & solstices). Another unique feature of MONAD is that you can record events “in the Now,” which encourages more presence in your life. A Health Event Mode allows you to see your personal, endocrine biorhythms in the context of planetary biorhythms we all share. The 24 hour circadian Calendar-Clock face is ideally suited to organize and display health events. If you choose to have MONAD integrate with the Apple Health app (HealthKit); then health data (e.g. Sleep period and Steps) read from HealthKit is used for display within the MONAD app. MONAD is beautiful, educational & transformative, and it will change the way you see the world around you, and your place within it. MONAD – A New Paradigm of Time.
Learn Acoustics Engineering
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Acoustics engineering Acoustical engineering (also known as acoustic engineering) is the branch of engineering dealing with sound and vibration. It includes the application of acoustics, the science of sound and vibration, in technology. Acoustical engineers are typically concerned with the design, analysis and control of sound. The branch of engineering that analyzes sounds and vibration in technology. It's the scientific application of implementing and developing solutions to reduce unwanted noise and vibrations caused by machines and human activity. Noise abatement technologies can reduce noise pollution in settings such as airports, schools, factories, office buildings, homes, bridges and train stations. Acoustic engineering may also enhance the acoustical experience in concert halls and recording studios. Audio Engineering Audio engineering is a broad field, and there’s a lot more to it than you might think. With a wide range of career options and responsibilities, audio experts can perform a myriad of jobs. Here is your ultimate guide to what audio engineering is, so you can understand the ins and outs of the audio world. Audio Engineer Roles There are five specialized roles within the world of audio engineering: recording engineer, mixing engineer, mastering engineer, live sound engineer, and multimedia sound engineer. Each plays a specific role within the music industry, and the path to each career has its own unique characteristics. What Does an Acoustic Engineer Do? Acoustics engineers are electronics engineers who specialize in designing and developing technologies that solve problems related to sound. For instance, they may apply fundamental scientific principles to find ways to monitor and manipulate sound levels or improve sound clarity. Depending on their area of interest within the field, acoustic engineers may specialize in architectural acoustics, noise control, structural acoustics or underwater acoustics. They often work with architects on building designs, but they can also find jobs related to noise reduction in factories and other industrial environments.
Screenshots
Verdict
The clearest difference is update cadence: Monad Calendar Clock at every 6 weeks against Learn Acoustics Engineering's every 31 months. Monad Calendar Clock also leads on price ($0.99 vs $1.99). On ads, in-app purchases, device support and iOS requirement 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
Monad Calendar Clock costs $0.99 and Learn Acoustics Engineering $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Monad Calendar Clock ships an update every 6 weeks, Learn Acoustics Engineering every 31 months. The most recent releases landed on September 6, 2026 and September 7, 2026 respectively.
| Parameter | Monad Calendar Clock | Learn Acoustics Engineering |
|---|---|---|
| Price | $0.99 — better | $1.99 |
| Rating | 3.7 (14 ratings) — better | — |
| Positive reviews | 22.2% of reviews | — |
| Number of ratings | 14 — better | — |
| Update frequency | Every 6 weeks — better | Every 31 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 | 13.0 |
| Further details — not scored | ||
| Size | 266 MB | 41 MB |
| Age rating | 4+ | 4+ |
| Developer | Earth at the Center LLC | Muhammad Umair |
In-app purchases
Monad Calendar Clock
No in-app purchases
Learn Acoustics Engineering
No in-app purchases
Questions
Is Monad Calendar Clock free?
Is Learn Acoustics Engineering free?
Do Monad Calendar Clock or Learn Acoustics Engineering have ads?
Which is updated more often, Monad Calendar Clock or Learn Acoustics Engineering?
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