What they have in common

Both sell prepaid, data-only travel eSIMs: you buy a plan for a country or region, install before you fly, and your phone rides a resold local network when you land. Neither gives you a local phone number by default. Both install from their own apps without QR juggling, both support top-ups mid-trip, and both run support around the clock. For a one-week city trip in a major destination, either will do the job without drama.

The differences start when you look past the basic transaction.

Coverage: Airalo’s home turf

On paper the catalogues have converged: both now claim 200+ destinations. The difference lives below the headline number. Airalo’s regional and global bundles are the most mature in the category, its long-validity plans go further, and its Discover+ tier adds global voice and SMS, which is why obscure destinations and complex multi-country itineraries still default to it.

Saily’s 200+ count is real but its regional options are thinner and its per-country network deals newer. For mainstream destinations, Japan, Thailand, the EU, the US, both are present and competitive. For a multi-stop trip through less-travelled countries, check both catalogues before assuming; depth, not breadth, is where Airalo still wins.

The app and the extras: Saily’s pitch

Saily comes from the team behind NordVPN, and it shows in the software. The app is cleaner than Airalo’s, plan setup is slightly more foolproof, and it bundles a security layer no other mainstream travel eSIM has: ad and tracker blocking plus web protection that screens malicious sites at the eSIM level, with a virtual-location option on some plans. If you were going to run a VPN on hotel wifi anyway, and our travel VPN guides argue you should think about it, getting a light version of that protection inside the data plan is a real convenience rather than a gimmick.

Saily’s 2026 feature run deserves its own paragraph, because none of it existed when most comparisons were written: an optional US phone number, a monthly rolling global plan for frequent flyers, in-app voice packs from $1.99, free access to WhatsApp, Google Maps, Uber and Grab even after your data runs out, and airport lounge access during eligible flight delays. That post-data app access is quietly the best safety net in the category: running out of data with maps and messaging still alive changes the failure mode entirely.

📷 SCREENSHOT NEEDEDAiralo and Saily apps side by side on the same destination’s plan list, prices visible.

On price, entry points tell the story: Saily’s country plans start at $1.99 against Airalo’s ~$4.50, and Saily is frequently a touch cheaper on popular routes; Airalo claws it back elsewhere. Neither is the budget option: that is Nomad, as our travel eSIM rankings cover.

Head to head

Three trips, decided

Two weeks in Japan. Check both plan pages for the resold carrier first, because Japan is a coverage-decides-it destination, as our Japan guide lays out. Between equal networks, Saily’s pricing on the route has been the sharper one; between unequal networks, the better carrier wins regardless of which app it lives in.

A five-country Europe rail loop. Airalo, mostly on the maturity of its regional Europe bundles: broader country lists and longer product history, which is what you want when the plan has to survive five border handovers. Saily’s Europe options are credible and closing the gap, but the default earns this one.

A working month in one city. Saily, on quality-of-life grounds: the cleaner app matters more across thirty days of top-ups and plan checks, and the built-in tracker blocking earns its keep across a month of cafe wifi sessions. If the month involves serious laptop tethering, check both providers’ hotspot terms before deciding; data-only plan terms vary by destination on both.

The pattern behind all three: destination coverage picks the shortlist, then app quality and price break the tie. Brand loyalty appears nowhere in that sequence, which is the point.

The verdict

Going somewhere unusual, or stacking a multi-country itinerary? Airalo, because the plan you need is more likely to exist, and its regional bundles are more mature. Read the full case in our Airalo review.

Going somewhere mainstream and want the nicest experience per dollar? Saily, especially if the security layer replaces something you would otherwise pay for separately. The Saily review digs into what the Nord pedigree does and does not get you.

And for either: before buying, check which local network the plan resells in your destination and cross-reference the carrier’s coverage map. That single check matters more than the brand, which is the running theme of every destination guide we write, Japan included.