Comparison

RealADSB vs KnowTAM

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

Head to head
About

RealADSB

Track local air traffic from your device using ADS-B data feeds. View aircraft on a map or list, filter by various parameters, and access additional flight information. Supports custom feeds and public data sources.

Highlights
  • ADS-B traffic feed consumption
  • Map and list view of aircraft
  • Aircraft filtering by tail number, callsign, type
  • METAR and altitude adjustments
  • Push notifications for squawks 7600/7700
  • Integration with online flight resources
Features
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RealADSB app is intended for stationary observers of local air traffic. It can consume traffic feed generated by adsb_hub or adsb_hub3 server applications. With some limitations traffic feed in SBS-1 BaseStation format (port 30003) is also supported. For example Stratux ADS-B device or ADSBx feeder can produce such feed. Another option to get traffic feed is to use Airplanes.live integration. That could be a good way to start using app because such option doesn't require additional hardware. You can setup traffic feed yourself or use one of the public feeds covering Germany, UK and New York. adsb_hub server application is using Java runtime and can run on PC, Mac or Raspberry Pi. It can work on top of FlightAware, FR24 feeders or generate feed using cheap USB adapter and external antenna. For more information please check our web site http://www.realadsb.com Inside mobile app commercial, private and military aircrafts are shown on map or in scrollable list sorted by distance from reference point. It can be your current location or airport defined by ICAO code such as LFPG. When ICAO code entered special button provides access to METAR and aircrafts below transition altitude will have altitude adjusted using barometric pressure of the airport. There is a way to search/filter aircrafts by tail number, callsign, type, altitude in both list and on map. Additionally 2 layers with airports and weather are available on map. For each airframe following basic parameters shown: * Speed, Altitude, Heading, Rate of climb/descend, Squawk and for most of them there is additional information: * Tail number, Callsign, ICAO type, Origin/Destination, Photo If information about tail number or type of aircraft is missing you can easily add it right inside the app. This change will be automatically shared across all devices that using same iCloud account. Other features: * Quick access to online resources including FlightAware, Google Flights, LiveATC etc. * Push notifications for special squawks 7600/7700 * Imperial or metric units * 3 types of map: standard, satellite and hybrid * Sharing of map with aircrafts using standard iOS Sharing Panel * Barometric pressure and altitude measured by mobile device conveniently shown at the bottom of main menu

About

KnowTAM

Prepare for FAA written and checkride oral exams with over 1,800 flashcards, quizzes, and practice exams. Features real FAA charts, timed practice tests, and a flight computer. Offers study plans and progress sharing with instructors.

Highlights
  • 1,800+ flashcards and quizzes
  • Practice exams with FAA timing
  • Oral-exam sets
  • Real FAA charts and figures
  • Study plan with spaced repetition
  • Progress sharing with instructors
  • Offline study mode
Features
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Pass your FAA written and your checkride oral with one app. KnowTAM has 1,800+ flashcards, quizzes, practice exams, and oral-exam sets, written and reviewed by a working CFI. Start free. Pay once. Never a subscription. READY FOR THE NEW INSTRUMENT QUESTIONS Since October 26, 2026, the FAA's Instrument test includes image-based questions built on current sectional, approach, and low-altitude en route charts. KnowTAM's Instrument deck has 24 cards on current FAA chart excerpts, so you practice reading them before test day. WHY PILOTS PICK KNOWTAM • Every card explains the "why," not just the answer, with the regulation or handbook reference and the exact FAA ACS code it covers. • Quizzes show why each wrong answer is wrong. • Real FAA figures: sectionals, instruments, approach plates, airport signs and markings, weather diagrams. • Timed practice exams built like the real test, with the FAA's time limits, scored against the 70% passing mark. Private exams follow the FAA subject blueprint. • A flight computer that works like the electronic one you take to the test, right beside every practice exam question. • Checkride and oral-exam sets that drill the way a Designated Pilot Examiner asks. Great before a flight review, too. A PLAN THAT GETS YOU THERE ON TIME Enter your rating and test date. KnowTAM sets each day's new cards and reviews, shows whether you're on track, and tells you when to take a practice exam. Spaced repetition brings back what you miss and spaces out what you know. In the final week, your plan brings back anything you haven't seen lately. STUDY WITH YOUR INSTRUCTOR • Share your progress by private link: practice exam scores, readiness by area, your study plan, and the ACS codes from your test report. It keeps up as you study and stops working when you turn it off. • Send a practice exam to your instructor, with every question you missed. • Lesson sets: your instructor sends the cards for your next lesson, with notes, as a link or a QR code. STAY WITH IT • A Today card with a ring for the day's cards, your streak, and a real finish when you're done. • Home Screen and Lock Screen widgets: today's plan with a Start button, your streak, and Plan details on the large widget. • Optional reminders at the times you choose, only on days your plan isn't done yet, plus reminders the week of your test. KNOW WHEN YOU'RE READY • Readiness by area shows which subjects are ready, close, or need work, from your practice exams and cards. One tap quizzes the weak ones. • Practice sets for the cards you missed recently and the ones you saved. • After the test, tell the app how it went. Passed? Share your pass and move on to your next rating. Didn't pass? Add the ACS codes from your test report, typed or read from a photo, and practice exactly those. STUDY ANYWHERE Fully offline, even in airplane mode. No account required. Study at the hold-short line, on a long cross-country, or on the airline ride to your checkride. A free optional account syncs progress across devices and lets you share it with your instructor. RATINGS COVERED • Private Pilot • Instrument Rating • Commercial Pilot • Multi-Engine (Vmc, the critical engine, single-engine performance) • Aviation Weather: free for everyone START FREE, PAY ONCE The first three Private modules and the whole Aviation Weather track are free. Unlock the rest of Private, add Instrument, Commercial, or Multi-Engine, add checkride oral prep, or get the All-Access Bundle. One-time purchases, never a subscription. No ads. Your study progress stays on your device unless you choose to sync it or share it with your instructor. An app by Fly With Winston. KnowTAM is an independent study material and is not affiliated with or endorsed by the FAA.

Screenshots

RealADSB4 screens
KnowTAM4 screens

Verdict

The call

The clearest difference is review sentiment: KnowTAM at 100% against RealADSB's 35%. KnowTAM also leads on price (Free vs $7.99) and rating (5.0 vs 3.0). RealADSB's advantage is in-app purchases (none vs 8) and device support (5 vs 2). On ratings volume and ads 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

KnowTAM is free to download; RealADSB costs $7.99 up front. KnowTAM sells 8 one-off in-app purchases. RealADSB asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

KnowTAM holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 4 and 3 respectively. Written reviews point the same way: 35% of RealADSB's written reviews are positive against 100% of KnowTAM's.

UpkeepUpdate frequency

RealADSB ships an update monthly, KnowTAM every 5 days. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

Scorecard8 real differences · 2 level
RealADSB versus KnowTAM: the parameters behind the verdict, then further details
ParameterRealADSBKnowTAM
Price$7.99Free — better
Rating3.0 (4 ratings)5.0 (3 ratings) — better
Positive reviews35.3% of reviews100.0% of reviews — better
Number of ratings4 — better3
Update frequencyMonthlyEvery 5 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, Mac, Apple TV, Apple Watch — betteriPhone, iPad
Requires iOS26.016.4 — better
Further details — not scored
Size52 MB94 MB
Age rating4+4+
DeveloperNikolay KlimchukWinston Tripp Aviation LLC

Customer experience

RealADSB

All ratings4 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews17 reviews
Positive35.3%
Neutral0.0%
Negative64.7%

KnowTAM

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

RealADSB

No in-app purchases

8 purchases

KnowTAM

One-time8
  • KnowTAM CAX Checkride$14.99
  • KnowTAM Instrument Checkride$14.99
  • KnowTAM Private Checkride$14.99
Show 5 more
  • KnowTAM Multi-Engine$19.99
  • KnowTAM Commercial (CAX)$39.99
  • KnowTAM Instrument (IRA)$39.99
  • KnowTAM Private (PAR) - Full$39.99
  • All-Access Bundle$99.99

Questions

Is RealADSB free?
RealADSB costs $7.99, with no in-app purchases.
Is KnowTAM free?
KnowTAM is free to download, with in-app purchases available.
Which has better reviews, RealADSB or KnowTAM?
KnowTAM is rated higher. RealADSB averages 3.0 out of 5 from 4 ratings, while KnowTAM averages 5.0 from 3 ratings.
Do RealADSB or KnowTAM have ads?
Neither RealADSB nor KnowTAM shows ads.
Which is updated more often, RealADSB or KnowTAM?
RealADSB ships an update monthly, and KnowTAM every 5 days. Most recently, RealADSB was updated on November 1, 2026 and KnowTAM on October 31, 2026.

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