Comparison

FlightReady E6B vs Stratus Horizon Pro

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

Head to head
About

FlightReady E6B

This aviation utility provides over 100 functions, conversions, and utilities for pilots. It offers accurate calculations for flight planning, performance, navigation, and aerodynamics, surpassing other E6B apps with its comprehensive and precise scientific formulas.

Highlights
  • Over 100 aviation functions
  • Accurate scientific formulas
  • Flight planning calculations
  • Performance metrics
  • Navigation tools
  • Extensive unit conversions
  • Weight & Balance calculations
Currently charting
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Over 100 aviation functions, conversions, and utilities, including functions that you won't find in any other E6B. Each function uses the correct scientific formula to ensure accuracy. Other E6B apps rely on rules of thumb that can be up to 10% off. The most comprehensive, accurate, and easiest to use E6B on the App Store. E6B Functions > Plan Leg ▸ Groundspeed ▸ True Heading ▸ Compass Heading ▸ Leg Time ▸ Distance ▸ Fuel Required ▸ Fuel Flow ▸ Endurance E6B Functions > Airspeed ▸ Actual TAS ▸ Actual Mach ▸ Plan Mach ▸ Plan TAS ▸ Total Air Temperature E6B Functions > Wind ▸ Wind Component ▸ Unknown Wind ▸ Wind Correction Angle E6B Functions > Altitude ▸ Pressure Altitude ▸ Density Altitude ▸ True Altitude E6B Functions > Climb & Descent ▸ Required descent gradient (percent, degress, ft/nm) ▸ Required descent rate (ft/min) ▸ Top of Descent ▸ Convert between percent, degrees, and ft/nm Extra Functions > Performance ▸ Rate of turn for angle of bank and airspeed ▸ Turn Radius for angle of bank and airspeed ▸ Required bank angle for standard rate turn ▸ Turn radius for standard rate turn ▸ Hydroplane speed ▸ Load factor in level turn ▸ Pivotal altitude Extra Functions > Navigation ▸ DME arc - distance along arc ▸ Thunderstorm cell height (from radar tilt and echo distance) Extra Functions > Aerodynamics ▸ Lift ▸ Power & Torque Conversions > Temperature ▸ Celsius ▸ Fahrenheit ▸ Kelvin ▸ Rankine Conversions > Distance ▸ Statute Miles ▸ Nautical Miles ▸ Kilometers ▸ Meters ▸ Feet Conversions > Speed ▸ Knots ▸ Miles Per Hour ▸ Kilometers Per Hour ▸ Feet Per Minute ▸ Meters Per Second ▸ Mach @ ISA Conversions > Pressure ▸ Inches of Mercury ▸ Millibar ▸ Kilopascal ▸ Pascal ▸ Standard Atmosphere ▸ Pounds per Square Inch Conversions > Fuel ▸ Convert between mass (pounds and kilograms) and volume (gallons and liters) for 100LL, Jet A, Jet B, and Water Conversions > Weight & Mass ▸ Pounds ▸ Kilograms ▸ Ounces Conversions > Area ▸ Square Miles ▸ Square Nautical Miles ▸ Square Kilometers ▸ Square Meters ▸ Square Feet Conversions > Liquid Volume ▸ Gallon ▸ Liter ▸ Ounce ▸ Quart ▸ Pint ▸ Cup Conversions > Dry Volume ▸ Cubic Feet ▸ Cubic Inches ▸ Cubic Meters ▸ Liters Conversions > Density ▸ Pounds per Cubic Foot ▸ Pounds per Cubic Inch ▸ Kilograms per Cubic Meter ▸ Slugs per Cubic Foot Conversions > Power ▸ Horsepower ▸ Kilowatts ▸ Watts Conversions > Torque ▸ Pounds-foot ▸ Pounds-inch ▸ Newton-meter ▸ Kilogram-meter Weight & Balance > CG & Moment ▸ Weight ▸ Moment ▸ C.G. Weight & Balance > C.G. Shift ▸ Amount of weight that must be shifted ▸ Distance the weight is or must be shifted ▸ Distance CG is or must be shifted Weight & Balance > C.G. % MAC ▸ CG location aft of leading edge of MAC ▸ CG location as a percent of MAC Time Utilities > Time Calculator ▸ Standard mathematical operations ▸ Convert time Time Utilities > Flight Log Calculator ▸ Calculate block and flight times in decimal and formatted time ▸ Set standard taxi times in Settings Time Utilities > Standard Calculator ▸ Standard mathematical operations Time Utilities > IFR Timer ▸ Countdown timer with audio, visual, and vibrating alerts Settings ▸ Change precision of conversions between zero, one, two, or three decimal places - default is two decimals places ▸ Day/Night modes What is an E6B? An E6B flight computer is traditionally an analog device resembling a combination slide rule and slide wheel that performs calculations specific to aviation. For example, an E6B can be used to calculate heading and groundspeed after taking into account forecast winds. An E6B is also used to calculate data used for performance planning such as density altitude. Our version goes beyond the analog E6B and even beyond all other E6B apps by including functionality to calculate time, rate and radius of turns, pivotal altitude (great for flight training use), and more.

About

Stratus Horizon Pro

This app provides a backup Attitude Heading Reference System (AHRS) for pilots, displaying pitch and bank information on a tablet. It also offers radio transcription and playback of air traffic control communications, converting audio to text for easy reference. Firmware updates for compatible devices are also available.

Highlights
  • Backup Attitude Heading Reference System (AHRS)
  • Responsive pitch and bank instrument display
  • Automatic AHRS alignment
  • Radio transcription and playback of ATC communications
  • Visual assist for referencing audio clips
  • Firmware updates for Stratus receivers
  • Day, night, and heads-up display modes
Features
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Backup Glass Cockpit on your iPad Stratus Horizon Pro displays a complete Attitude Heading Reference System (AHRS) for supplemental attitude information in your cockpit. Driven by a Stratus receiver, the AHRS feature will display a super responsive pitch and bank instrument on your iPad. It aligns itself automatically, so you can just turn it on and fly. This provides an excellent backup for emergency situations. Radio Transcription & Playback Plug in and play back. You’ll never have to say “say again” again when you use the radio playback feature. Plug in a Stratus Audio Cable to capture ATC communications for easy one-touch playback. Similar to how visual voicemail works, the ATC communications will be converted into text, providing a visual assist for referencing previous audio clips for playback. This enables pilots to receive a clearance, ATIS, or other important ATC communications without needing to write them down Stratus Audio Cable The Stratus Audio Cable (available to purchase for $49.99 from the Appareo web store) is needed to enable the radio transcription and playback feature. No cellular service or internet connection is required to operate the app. Stratus Device Management Download firmware updates for all models of Stratus portable ADS-B receivers, Stratus 1, 2, 1S, 2S, 2i, 3, 3i, and 4. Switch your Stratus 3 to "Open ADS-B Mode" to utilize its GDL-90 protocol that integrates Stratus with most flight apps. Stratus 4 defaults to GDL-90 mode. Enable notifications to get updates any time there is a firmware update to your portable device. Stratus Horizon Pro is a flight app that can be viewed in day mode, night mode, or via heads-up display. App Multitasking Stratus Horizon Pro supports app multitasking with split view and overlay view, so you can use radio transcription and playback alongside your favorite EFB. The EFB app must be able to support multitasking.

Screenshots

FlightReady E6B4 screens
Stratus Horizon Pro4 screens

Verdict

The call

The clearest difference is price: Stratus Horizon Pro at Free against FlightReady E6B's $7.99. Stratus Horizon Pro also leads on update cadence (every 2 months vs every 3 months) and iOS requirement (16.6 vs 18.6). FlightReady E6B's advantage is review sentiment (85% vs 42%) and rating (4.7 vs 3.8). On ads 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

Stratus Horizon Pro is free to download; FlightReady E6B costs $7.99 up front. Stratus Horizon Pro sells 2 in-app purchases, starting at $4.99 per month. FlightReady E6B asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

FlightReady E6B holds the better App Store score, 4.7 against 3.8. That said, the two scores are not equally well evidenced: FlightReady E6B has 1.1K ratings behind it against 36, so its average is the more settled of the two. Written reviews point the same way: 85% of FlightReady E6B's written reviews are positive against 42% of Stratus Horizon Pro's.

UpkeepUpdate frequency

FlightReady E6B ships an update every 3 months, Stratus Horizon Pro every 2 months. The most recent releases landed on September 22, 2026 and September 13, 2026 respectively.

Scorecard9 real differences · 2 level
FlightReady E6B versus Stratus Horizon Pro: the parameters behind the verdict, then further details
ParameterFlightReady E6BStratus Horizon Pro
Price$7.99Free — better
Rating4.7 (1.1K ratings) — better3.8 (36 ratings)
Positive reviews85.3% of reviews — better41.7% of reviews
Number of ratings1.1K — better36
Update frequencyEvery 3 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
Best chart rank#48 — better—
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.616.6 — better
Further details — not scored
Size9 MB281 MB
Age rating4+4+
DeveloperAeroapps TechnologyAppareo Systems, LLC

Customer experience

FlightReady E6B

All ratings1,056 ratings
Positive94.6%
Neutral2.1%
Negative3.3%
Written reviews34 reviews
Positive85.3%
Neutral5.9%
Negative8.8%

Stratus Horizon Pro

All ratings36 ratings
Positive61.1%
Neutral16.7%
Negative22.2%
Written reviews12 reviews
Positive41.7%
Neutral16.7%
Negative41.7%

Bugs and requests

FlightReady E6B

Reported bugs

2 issues
  • Fuel computation functions crashing
  • New extra functions not working

Requested features

3 requests
  • Add wind correction angle calculation
  • Include seconds in time measurements
  • Provide user manual or instructions

Stratus Horizon Pro

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

FlightReady E6B

No in-app purchases

2 purchases

Stratus Horizon Pro

Subscriptions2
  • ATC Transcription - Monthly1 Month trial$4.991 Month
  • ATC Transcription - Yearly1 Month trial$49.991 Year

Questions

Is FlightReady E6B free?
FlightReady E6B costs $7.99, with no in-app purchases.
Is Stratus Horizon Pro free?
Stratus Horizon Pro is free to download, with in-app purchases available.
Which has better reviews, FlightReady E6B or Stratus Horizon Pro?
FlightReady E6B is rated higher. FlightReady E6B averages 4.7 out of 5 from 1.1K ratings, while Stratus Horizon Pro averages 3.8 from 36 ratings.
Do FlightReady E6B or Stratus Horizon Pro have ads?
Neither FlightReady E6B nor Stratus Horizon Pro shows ads.
Which is updated more often, FlightReady E6B or Stratus Horizon Pro?
FlightReady E6B ships an update every 3 months, and Stratus Horizon Pro every 2 months. Most recently, FlightReady E6B was updated on September 22, 2026 and Stratus Horizon Pro on September 13, 2026.

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