At some point in every simmer’s journey, the skies stop feeling big enough alone. You want ATC that actually responds, traffic that behaves like real traffic, and the slight nervous energy of knowing a real person is watching your approach on radar. That’s the moment you look at VATSIM and IVAO and have to decide which one to join first. I’ve spent serious time on both networks. Here’s what I actually think.
The basics: what both networks offer
VATSIM (Virtual Air Traffic Simulation Network) and IVAO (International Virtual Aviation Organisation) both do the same fundamental thing: they connect flight simulation pilots with volunteer ATC controllers in a shared online environment. You load your simulator, connect a client, and suddenly you’re sharing airspace with hundreds of other pilots flying real procedures under simulated ATC service.
Both networks are free to join. Both support the major simulators – MSFS, X-Plane, and Prepar3D. Both have a training program for pilots new to online flying, and both have an ATC training pathway for members who want to staff controllers positions. At the surface level, they’re more similar than different.
VATSIM: the larger network
By raw numbers, VATSIM is bigger. On a busy Friday evening, you’ll find several thousand pilots connected simultaneously, with ATC coverage across every major region. The US and European hubs – the big ones like EGLL (Heathrow), KLAX (Los Angeles), KJFK (New York), EGCC (Manchester) – reliably have top-down coverage during peak hours.
That size advantage translates directly into the experience at major airports. Flying into EGLL on a VATSIM UK fly-in event feels genuinely immersive – you’re number twelve for the ILS, holding over LAM, listening to a controller who sounds like they know exactly what they’re doing. The community that built up around VATSIM is enormous, which means there are also more tutorials, more YouTube guides for using the client software, and more forum posts answering whatever beginner question you have.
The tradeoff is that outside peak hours or outside major hubs, coverage thins out. Flying a regional route in Southeast Asia on a Tuesday morning, you’re often flying with no ATC online. That’s not a failure of the network – it’s just math. Volunteers staff the positions they find interesting, and the interest concentrates around major airports.
IVAO: structured, global, detailed
IVAO has a different character. The network is smaller but has a stronger presence in certain regions – particularly South America, the Middle East, and parts of Asia-Pacific where VATSIM coverage is thinner. If you’re flying routes that touch those areas regularly, IVAO’s ATC coverage there can actually be better on average.
IVAO also has a reputation for a more structured training program and stricter standards in some divisions. The rating system is more granular – there are more steps between “new pilot” and “rated instrument pilot” – which some people find motivating and others find bureaucratic. The controller training is similarly detailed, which tends to produce a consistent quality of service when controllers are online.
The software ecosystem around IVAO has modernized significantly with their Aurora client and IvAp successor, and the map and statistics tools at ivao.aero are genuinely good. IVAO also tends to run well-organized division-level events that draw concentrated traffic to specific regions.
The pilot experience: connecting and flying
On VATSIM, the primary pilot client is vPilot for MSFS/P3D and X-Pilot for X-Plane. Setup is straightforward – register on the VATSIM website, download the client, enter your credentials, and connect. The recommended starting point is to get a basic pilot rating by reading the documentation and passing a short online test.
IVAO uses its own client software. The connection process is similar. Both networks provide a map view showing live traffic, and both have flight planning integration that lets you file a flight plan before connecting – a requirement if you’re going to operate under IFR on either network.
From a practical standpoint, the day-to-day experience of flying on either network under active ATC is very similar. The phraseology conventions are close (both follow ICAO standards with some variations), the procedures are recognizable, and the general quality of service from experienced controllers is comparable. New pilots will barely notice a difference once they’ve learned the basics.
Which one should you start with
My honest answer is VATSIM for most people, specifically because of the larger community and the better chance of finding ATC coverage on your first few flights. The learning curve for online flying is real – working with live ATC for the first time is nerve-wracking even when you know the procedures – and having more active controllers and more community support makes that curve less steep.
That said, there are legitimate reasons to start with or add IVAO: you fly routes where IVAO has better regional coverage, you prefer a more structured training pathway, or you’ve found that the specific virtual airline you want to join operates primarily on IVAO. Some larger VAs fly exclusively on one network or the other, and if the community matters as much as the network, that’s the deciding factor.
Nothing stops you from having accounts on both. The clients don’t conflict, your logbook systems are separate, and many simmers switch between them depending on where coverage is better for a given flight. Think of them as two venues for the same hobby, not competing religions.