B4UFLY is the FAA's official free drone safety app. It tells you the airspace class at your GPS location and gives you a green, yellow, or red indication of whether flying is likely okay. For a free government app, it does that job reasonably well.
The problem is that airspace class is one piece of a legal preflight. Pilots who treat a green B4UFLY indicator as a complete preflight check are missing most of what Part 107 requires.
What B4UFLY Does Well
Airspace classification at a glance. B4UFLY pulls your GPS location and shows you the airspace class. For a pilot standing in a field wondering "am I in controlled airspace?", the app gives a quick answer.
Active TFRs. B4UFLY shows temporary flight restrictions in the area. This is one of the app's genuinely useful functions -- TFR data is live and the display is reasonably clear.
Basic restriction flags. The app flags national parks, stadiums, and certain other restricted areas.
It's free and official. B4UFLY is maintained by the FAA. There is no subscription cost and no question about whether the airspace boundaries are current -- they come directly from FAA sources.
What B4UFLY Does Not Do
No weather data. B4UFLY shows no METAR, no TAF, no wind, no visibility, no ceiling. Legal flight requires weather minimums under 14 CFR 107.51. A green B4UFLY result says nothing about whether conditions are flyable.
No safety score. B4UFLY gives a colored indicator with no explanation. When the indicator is yellow, you do not know why -- which specific factor is elevated, how elevated it is, or what to do about it.
No restricted zone database depth. B4UFLY's restriction flagging covers major categories but misses many zone types that affect real commercial operations: hospital helipads with their own airspace, tribal lands, power plant buffer zones, specific regional park district restrictions, and city ordinances.
No airport details. B4UFLY does not show tower frequencies, phone numbers, or tower operating hours. If you need to contact the tower for coordination, B4UFLY leaves you to find that information separately.
No LAANC status. B4UFLY shows whether you are in controlled airspace but does not tell you directly whether LAANC authorization is available at your specific location or what the UAS Facility Map ceiling is for your coordinates.
No checklist. Part 107 compliance involves more than airspace. Battery check, visual inspection, Remote ID, registration verification -- none of this is in B4UFLY.
No shareable output. B4UFLY produces no documentation for client handoff, insurance records, or regulatory compliance files.
Who B4UFLY Is For
B4UFLY is genuinely useful as a quick sanity check -- a way to verify airspace class before a recreational flight in a familiar area, or as a secondary check against another tool.
For Part 107 commercial pilots, a complete preflight requires weather data, restricted zone verification, TFR confirmation, LAANC status, and documentation. B4UFLY covers one of those items.
The Alternative
UAS SkyCheck was built specifically for the gap B4UFLY leaves. A single check returns airspace class, LAANC status, live TFRs with expiry countdown, METAR weather, restricted zones from a database of 11,269 entries, GPS health, a 0-100 safety score with every deduction explained, and ATC tower contact information. Free, no account required.
The two tools are not really competitors -- B4UFLY answers "what class is this airspace?" and SkyCheck answers "is it legal and safe to fly here right now?"