Best Public WiFi Security Apps for iPhone and Android (2026)

The short answer

For most people, public WiFi in 2026 is safer than its reputation. The US Federal Trade Commission puts it simply: because of the widespread use of encryption, connecting through a public WiFi network is usually safe. Most apps and websites now use HTTPS, so the person running the hotspot cannot read your passwords or messages.

What still goes wrong is the network itself: a lookalike hotspot with the airport’s name, a login page that asks for far more than it should, DNS answers that send you somewhere else, or a connection that quietly downgrades a secure page. That is where a small app helps. Pick by the job you need done:

• “Is this network okay to use right now?” A network checker such as SentryFi.
• “Who and what is on this network?” A network scanner such as Fing, WiFiman or Network Analyzer. Most useful on networks you own.
• “I want my traffic encrypted no matter what.” A VPN or encrypted tunnel such as Cloudflare WARP, Proton VPN or Mullvad, or the tools built into your phone.

The comparison table

Prices as shown on each vendor’s site or US App Store listing on 19 October 2026. They change, and Google Play prices can differ.

Network checkers: should you trust this hotspot?

SentryFi (our app)

You join the network, open SentryFi and tap check. In under a minute it runs quick tests against well-known public sites: whether there is a sign-in (captive) page, the encryption type, whether DNS answers match trusted resolvers, whether a proxy sits in the middle, whether page content was changed on the way, whether HTTPS is being forced down to plain HTTP, the certificate, and how stable the connection is. You get a 0–100 score, the reasons behind it, and plain next steps such as “skip banking here” or “switch to mobile data”. The scan runs on the phone, with no account.

Limits: SentryFi is not a VPN and does not carry your traffic. No app can prove who runs a network, so a good score describes that network at that moment; it is a guide, not a guarantee. The free version has ads.

Network scanners: what is on this network?

Scanners list the devices they can see on the local network, with names, makers and open ports. They are excellent at home (spotting an unknown device on your router) and handy for curious travellers, but on a well-run public network the list is often short, because guest networks usually keep devices apart. A scanner does not tell you whether the hotspot is genuine.

Fing

The best-known scanner. It identifies devices by IP, MAC address, maker and model, and adds port scans, ping, traceroute, DNS lookups, a speed test and new-device alerts. The core app is free with ads; on the US App Store, Starter is $3.99 a month and Premium $7.99 a month (or $39.99 and $69.99 a year). Fing’s hardware box, sold separately, adds features such as blocking devices on your own network.

WiFiman

A free, ad-free analyzer from Ubiquiti, the company behind UniFi routers. It finds nearby networks, discovers devices, runs speed tests and suggests channels and access-point placement. Its Teleport feature is a VPN back to your own UniFi network, so it only helps if you own that gear. It is an analyzer, not a public-WiFi shield.

Network Analyzer

A long-running iPhone toolkit by Techet: LAN scan, ping, traceroute, port scan, whois, DNS lookup and a page of network details (gateway, external IP, whether a VPN is on). Free with ads, with a paid Pro upgrade for extras such as a speed test. Good for people who like to see the raw numbers.

VPNs and tunnels: encrypt everything

A VPN wraps your traffic in an encrypted tunnel to the VPN company, so the hotspot owner sees only that you are connected to it. That protects you even if a site or app on your phone is not using encryption properly. The trade-off is that you are now trusting the VPN company with what the hotspot used to see, so pick one with a clear privacy policy, and be wary of free VPNs that make money from ads or data.

Cloudflare 1.1.1.1 with WARP

A free app that sends your phone’s traffic through Cloudflare over an encrypted connection and uses its 1.1.1.1 DNS. It is quick to set up and costs nothing, with a paid WARP+ tier. It is built for privacy and speed rather than for changing your apparent country, so you cannot pick a server location as you would with a classic VPN.

Proton VPN (Free plan)

Proton’s free plan is unusually generous: no data limit, no speed limit and no ads, on one device, with a free Proton account and a no-logs policy. Paid plans add more devices, server choice and extras. For a traveller who wants a VPN only for the odd hotel stay, the free plan is a sensible default.

Mullvad VPN

A privacy-first VPN with one flat price, €5 a month on every plan length, for up to five devices. You get an account number instead of signing up with an email, and you can pay in cash or crypto. There is no free plan or trial, but Mullvad offers a 14-day money-back window for most payment methods.

What is already built into your phone

• iPhone: Private Wi-Fi Address. On by default; your iPhone uses a different hardware address on each network so networks cannot easily track you from place to place. Since iOS 18 you can choose Off, Fixed or Rotating per network. It hides your device’s identity, it does not encrypt your traffic. See our guide to whether to leave it on.
• iPhone: the “Weak Security” label. iOS flags networks that use old or no encryption. It is worth reading, not panicking about; here is what the warning means.
• iCloud Private Relay. Part of a paid iCloud+ plan. Apple describes it as protecting your browsing in Safari with two relays, so no single company sees both who you are and which site you visit. It is not a full-device VPN, and it is not available in every country.
• Pixel: VPN by Google. Google says Pixel 7 and later phones include a free VPN in supported countries (Settings, then Network & internet, then VPN). The older Google One VPN subscription ended in 2024. Check Google’s Pixel help page for your country.

Which one should you use?

• You travel a few times a year and mostly browse, stream and message. Keep your phone updated, use a checker on unfamiliar networks, and switch to mobile data for banking if anything looks off. A VPN is optional.
• You work from cafés, airports and hotels every week. Use a VPN by default (Proton’s free plan, Mullvad, WARP or your company’s VPN) and a checker when a network behaves oddly, for example a login page that does not load or certificate warnings.
• You want to know what is on your home network. Fing or WiFiman. That is what scanners do best.
• You are on a network that asks for a card or a password you did not expect. Stop. No app makes that safe; read how evil twin hotspots work and use mobile data instead.

Whatever you install, the habits matter more than the app: check the network name with staff or official signs, treat a certificate warning as a stop sign, and keep two-factor sign-in on your important accounts. Our travel WiFi checklist puts those habits on one page.

What no app can do

No app can guarantee that a public network is safe, and you should be suspicious of any app that promises to. A checker can only see signs of interference at the moment it runs. A scanner can only see devices that answer it. A VPN protects the path from your phone to the VPN, but not a phishing page you choose to type your password into, and not a fake app. That is why the FTC’s advice is mostly about habits: look for HTTPS, use strong passwords and two-factor authentication, keep your software updated, and be wary of sites that imitate real ones.

Questions people ask

What is the best app to check if public WiFi is safe?

Use a network checker, which tests the network you are on for warning signs such as DNS redirects, a proxy, altered page content or HTTPS downgrades. SentryFi (made by Srofia) does this on iPhone and Android for free and gives a 0–100 score with reasons. Scanners like Fing show devices on a network but do not judge whether the hotspot is genuine.

Do I need a VPN on public WiFi in 2026?

Not always. Most apps and sites use HTTPS, and the FTC says connecting through public WiFi is usually safe because of that. A VPN adds a useful layer if you work on public networks often, or if a network shows warning signs. Proton VPN has a free plan with no data cap; Mullvad is €5 a month.

Is a free VPN safe to use?

Some are. Look for a clear no-logs policy and a business model that is not built on ads or selling data. Proton VPN’s free plan has no ads and no data limit, and Cloudflare’s WARP is free. Avoid unknown free VPNs that ask for broad permissions.

Can Fing tell me if a WiFi network is hacked?

Not directly. Fing lists the devices it can see and their open ports, which is very useful on a network you own. On a public network it cannot prove who runs the hotspot or whether traffic is being tampered with. A network checker or a VPN covers that gap.

Is SentryFi a VPN?

No. SentryFi checks the network you are on and shows whether a VPN tunnel is active, but it does not carry or encrypt your traffic. Many people use it alongside a VPN: SentryFi to judge the network, the VPN to encrypt.

Sources

Checked on October 19, 2026. Prices and features change; check the store listing before you buy.

• FTC — Are public Wi-Fi networks safe? What you need to know
• CISA — Best practices for using public Wi-Fi (tip card)
• Fing — App Store listing
• WiFiman — App Store listing
• Network Analyzer — App Store listing
• Cloudflare 1.1.1.1 with WARP
• Proton VPN — free plan
• Mullvad VPN — pricing
• Apple — About iCloud Private Relay
• Apple — Use private Wi-Fi addresses on Apple devices
• Android Authority — Google One VPN shutting down (2024)
• SentryFi (our app)