Comparison

Bagua Compass Tools vs avAltimeter

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Bagua Compass Tools

This app helps you understand Feng Shui principles by calculating your personal "gua" symbol based on your birthday. It then uses your device's compass to identify auspicious and inauspicious directions for your living space, offering tips to enhance positive energy and neutralize negative influences.

Highlights
  • Personal "gua" symbol calculation
  • Eight flow directions of Qi detection
  • Auspicious and inauspicious direction identification
  • Compass-based directional guidance
  • Tips for utilizing or neutralizing directions
Features
Read full description

Feng Shui means "Wind and Water". This art seeks to achieve harmony and balance between ourselves and our surroundings. When you choose a home, move in and arrange your furniture you are already either practicing good Feng Shui or bad Feng Shui. Bagua Compass application gets your birthday and calculates a "gua" symbol. Base on the "gua" symbol that is calculated, we can detect eight flow directions of Qi with four auspicious directions and four Inauspicious directions. Using compass inside your iPhone, we will tell you which is best direction to using and bad direction to avoid, there are some tips per direction to utilize or Neutralizing their effect.

About

avAltimeter

This aviation-focused altimeter app provides accurate altitude readings using built-in pressure sensors. It offers Kollsman adjustment, density altitude calculations, and oxygen requirement warnings for increased flight safety.

Highlights
  • Kollsman adjustment for barometric pressure
  • Density Altitude and True Airspeed calculation
  • Automatic barometric pressure updates from airports
  • Oxygen requirement warnings based on altitude
  • Imperial/Metric unit selection
  • Day/Night illumination modes
Features
Read full description

Simple and Effective! avAltimeter is a digital, aviation-oriented altimeter. It is the only altimeter app which has the Kollsman adjustment so you can adjust the altimeter to the current barometer setting, or to 29.92 inches of mercury for the pressure altitude. Need a quick backup for your panel? avAltimeter uses the latest Apple and Bosch technology built into the iPhone 6 and later models. Earlier models of the iPhone and iPads before iPad Air 2 or Mini 4 do not have the required pressure sensing hardware and do not work. All iPad Pro models work too! Smart! avAltimeter calculates the temperature sensitive Density Altitude. Based on the Density Altitude, the app also calculates True Airspeed as a function of Indicated Airspeed. avAltimeter calculates a rough estimate of the increased required Take-Off distance from that at seal level from increased Density Altitude as well. You can even set the App to obtain automatically obtain the latest barometric pressure from the closest reporting airport. The barometer setting will auto-update every 20 minutes, or if you move more than 25 miles from your previous location. When using the live METAR update feature, the App will display which airport pressure it is using, and how old the reading is. This feature requires an internet connect and active GPS, so it will not work well if you are flying inside a jet. In a jet, the App works great to track the cabin pressure if you just leave the barometric pressure set at 29.92 inHg. Increased Safety! Know your oxygen requirements. avAltimeter tracks your altitude and provides a warning to use oxygen when you exceed FAA mandated limits. Customizable! avAltimeter is customizable. Choose Imperial or Metric units. Set the Altimeter Setting through a popup Kollsman window or by directly setting the field altitude. The field altitude can be set manually or automatically by GPS. Select Day or Night illumination. Turn the audio alarms for oxygen on or off. Improve the take-off performance estimate by selecting your propellor type: constant speed or fixed pitch. Sensitive! The Bosch sensor chip built in to the iPhone 6 and later is sensitive to changes in altitude of three feet or less and has an estimated range from -1500 feet to over 20,000 feet. Unique! Unlike other aviation apps, avAltimeter uses actual barometric pressure to calculate altitude, not a GPS estimate. The barometer is only available in iPhone 6 and later or the iPad iPad Air 2, Mini 4 as well as all iPad Pro! Legal Disclaimer This is an app, not an FAA approved flight instrument. It has not been certified as meeting the relevant TSO specifications. This app can not be used as a primary flight instrument.

Screenshots

Bagua Compass Tools4 screens
avAltimeter4 screens

Verdict

The call

The clearest difference is price: Bagua Compass Tools at Free against avAltimeter's $0.99. Bagua Compass Tools also leads on ratings volume (126 vs 19) and iOS requirement (11.0 vs 17.6). avAltimeter's advantage is rating (4.6 vs 3.8) and in-app purchases (none vs 1). On update cadence 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

CostPrice · In-app purchases · Ads · Monetization

Bagua Compass Tools is free to download; avAltimeter costs $0.99 up front. Bagua Compass Tools sells 1 one-off in-app purchase. avAltimeter asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

avAltimeter holds the better App Store score, 4.6 against 3.8. That said, the two scores are not equally well evidenced: Bagua Compass Tools has 126 ratings behind it against 19, so its average is the more settled of the two. Written reviews point the same way: 40% of Bagua Compass Tools's written reviews are positive against 50% of avAltimeter's.

UpkeepUpdate frequency

Bagua Compass Tools ships an update every 7 months, avAltimeter every 4 months. The most recent releases landed on November 2, 2026 and November 6, 2026 respectively.

Scorecard8 real differences · 2 level
Bagua Compass Tools versus avAltimeter: the parameters behind the verdict, then further details
ParameterBagua Compass ToolsavAltimeter
PriceFree — better$0.99
Rating3.8 (126 ratings)4.6 (19 ratings) — better
Positive reviews39.7% of reviews50.0% of reviews — better
Number of ratings126 — better19
Update frequencyEvery 7 monthsEvery 4 months — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPodiPhone, iPad
Requires iOS11.0 — better17.6
Further details — not scored
Size27 MB2 MB
Age rating4+4+
DeveloperHuy PhanAviametrix, LLC

Customer experience

Bagua Compass Tools

All ratings118 ratings
Positive67.8%
Neutral5.1%
Negative27.1%
Written reviews58 reviews
Positive39.7%
Neutral6.9%
Negative53.4%

avAltimeter

All ratings19 ratings
Positive89.5%
Neutral0.0%
Negative10.5%
Written reviews8 reviews
Positive50.0%
Neutral12.5%
Negative37.5%

In-app purchases

1 purchases

Bagua Compass Tools

One-time1
  • Unlock full version$4.99
None

avAltimeter

No in-app purchases

Questions

Is Bagua Compass Tools free?
Bagua Compass Tools is free to download, with in-app purchases available.
Is avAltimeter free?
avAltimeter costs $0.99, with no in-app purchases.
Which has better reviews, Bagua Compass Tools or avAltimeter?
avAltimeter is rated higher. Bagua Compass Tools averages 3.8 out of 5 from 126 ratings, while avAltimeter averages 4.6 from 19 ratings.
Do Bagua Compass Tools or avAltimeter have ads?
Bagua Compass Tools shows ads; avAltimeter does not.
Which is updated more often, Bagua Compass Tools or avAltimeter?
Bagua Compass Tools ships an update every 7 months, and avAltimeter every 4 months. Most recently, Bagua Compass Tools was updated on November 2, 2026 and avAltimeter on November 6, 2026.

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