How long does it take to build a VPN app?

A client that reuses an existing protocol core is close to the size of a mobile app MVP, which we publish at $4,800 to $8,500 across four to six weeks. Native tunnel extensions on both iOS and Android, plus the node infrastructure behind them, usually push the work beyond that window. We give you a fixed range after a short technical review of the protocol core and the store history.

Do you work on a VPN app someone else built?

Yes, that is a large part of what we do. We start by reading the existing client, the tunnel configuration, and the last two store releases, then report what is fragile before changing anything. From there we can fix reconnect and kill switch behaviour, move to a protocol stack that survives filtering, or rebuild the client in Flutter with native tunnel modules.

What does a kill switch actually have to do?

It has to stop traffic the moment the tunnel drops, including the seconds while the app is reconnecting or after the operating system suspends it. We test that path by killing the tunnel process on a real device and watching whether anything leaves the phone. A switch that only reacts when the user taps disconnect is not a kill switch.

How do you handle subscriptions in a VPN app?

Purchases go through Apple and Google billing, so the client sends a receipt to your backend and the backend decides what the account is entitled to. We build the restore flow, device limits, grace period, and cancellation handling with it. Ad-supported products such as Voice VPN use a credit system instead, and both models can run side by side.

Can you guarantee our app will not be blocked?

No, and we will not put that promise in a store listing. What we can do is resist the filtering methods that are documented today: stealth-capable transports, endpoint rotation, and fallback paths when a node stops responding. A promise of unblocked access everywhere cannot be checked by the person reading it, so we replace it with wording that can.

Privacy-First Mobile VPN App Development

Mobile VPN app development for iOS and Android: fast connection times, working kill switch, entitlements, and store listings backed by verifiable claims.

See our work:

Voice VPN - Fast VPN. Vasilkoff Ltd in-house project→Easy VPN Free→

Privacy-First Mobile VPN App Development

What breaks in a VPN product

A VPN app gets about thirty seconds to earn its place. When the tunnel takes ten seconds to come up, or drops while someone walks from Wi-Fi to mobile data, the user uninstalls and writes a review saying the app does not work. Subscriptions and ad revenue follow the reviews down.

The difficult engineering sits behind that first tap. Mobile platforms limit how long a background tunnel may run and how it restarts. A connection that fails without a kill switch leaks the traffic the customer installed the app to protect. Protocol choices that work on a home network get fingerprinted and throttled in the regions where the product matters most. Listings add risk, since claims about logging and global access get checked by reviewers and users.

We have built two VPN clients ourselves: Voice VPN, a censorship-resistant Flutter app in production, and Easy VPN Free, an open-source Android client published on GitHub.

Who we build this for

VPN operators whose reconnect delays and failed connections show up in reviews and cancellations
Teams shipping a privacy tool into restricted networks, where standard protocols get blocked or throttled
Products adding a tunnel to an existing service, such as corporate access or unblocking voice traffic
Founders whose first version came from a contractor and now needs hardening or store compliance

What we deliver

Onboarding that does not ask for a password

Voice VPN connects without an account. Someone installs it, taps once, and the tunnel comes up. We apply the same principle wherever the business model allows, and we ask for an account only when subscriptions or device limits need one. Cutting that step removes the most common drop-off in the funnel.

Connection handling, kill switch, and reconnect

Our VPN work runs on Flutter with native tunnel integrations: Android Services on one side, iOS NetworkExtension on the other. The interface team keeps one codebase while the tunnel runs inside the platform network stack, where the reliability comes from.

We test the failure paths hardest: connect and disconnect cycles on weak signal, automatic reconnect after a network switch, tunnel restart after the operating system suspends the app, and the kill switch blocking traffic while the tunnel is down. Those conditions decide retention more than any screen design.

Protocol selection and server paths

Voice VPN is built on the Project X ecosystem and Xray-core, which drive VLESS, VMess, Trojan, and Shadowsocks from one backend. Some deployments use REALITY to remove the obvious TLS identity of a proxy endpoint, and Cloudflare-assisted routing where an extra hop improves reachability. A client's protocol options should follow from where its users are, so we test transports against real networks before exposing them.

Node provisioning is automated with Ansible in our own product, because a blocked endpoint needs replacing in hours rather than weeks.

Server selection and latency display

People judge a server list by the bars next to each location. We measure latency to each node, display what was measured, and refresh it on a schedule the phone can afford. Fallback order and a fast option that picks by measured latency come from the same data.

Entitlements, subscriptions, and credits

Voice VPN funds itself through credits, optional ads, and referral rewards, with full speed for every user, which suits an ad-supported product. A subscription product needs different plumbing: purchase restoration, device limits, receipt validation, and grace handling when a payment fails. We build both models with the backend that decides who is entitled to what, covered under in-app purchases and subscriptions.

Store policy and release work

Both stores treat VPN apps as a category with extra rules. Apple expects a personal VPN client to use the Network Extension framework and asks what data leaves the device. Google Play expects the app to declare its VPN use and applies tighter limits when a listing targets children. We prepare the declarations, privacy wording, and review notes, then handle submission under App Store and Google Play publishing support.

Claims we will not write into your store listing

Here is what we will not publish without evidence behind it:

"No logs anywhere", unless the infrastructure, retention schedule, and operator policy enforce it. Our own app states no account and no traffic logs, and even that sentence has to match what the servers do.
"100% anonymous", "untraceable", or "military grade encryption". Encryption strength belongs on a technical page with named protocols, not in a slogan.
"Works in every country", "bypasses any firewall", or "unblockable". A tool can survive many networks, and no one can promise all of them.
Server counts, country counts, and speed figures that do not match the live fleet.
"Zero data collection" on an app that ships analytics, crash reporting, or an ad SDK. If the SDK collects, the policy has to say so.
"Free forever" entitlement promises that depend on ad networks and server bills nobody controls.

If the person reading a claim cannot check it, we replace it with one they can.

How the engagement runs

We take over existing codebases about as often as we start new ones, so the first week is a technical review: the client architecture, tunnel configuration, entitlement model, and the last few store releases. You get a written report of what is fragile and what we would change first, whether or not you continue.

Delivery runs in short increments with a build you can install, so connection behaviour gets tested on real devices. Our device matrix covers current iOS and Android versions plus mid-range hardware, because a tunnel that behaves on a flagship can fail on the phones most of the audience owns. Before release we prepare store declarations and a staged rollout.

What it costs

Work runs at our flat rate of $39 per hour, or as a fixed scope once the technical review is done. A VPN client that reuses an existing protocol core sits close to the size of a mobile app MVP order, which we publish at $4,800 to $8,500 across four to six weeks. Native tunnel extensions on both platforms, a node fleet, and a credit or subscription economy usually push the work beyond that window. Operators who need continuous work across the client and the servers take a monthly capacity plan from $2,699. The pricing page lists both models and the typical orders.

The main scope drivers are how many platforms need a native tunnel and how much of the server side we own.

Proof

Voice VPN is our own Flutter product for censored networks: one-tap onboarding with no account, Xray-based transports including REALITY, and connection times around one to two seconds on healthy networks. It proves we can carry a mobile VPN from protocol choice to a working monetization model, and run the infrastructure behind it.

Easy VPN Free is an open-source Android client built on the volunteer-run VPN Gate network and released under GPL-3.0 with automated builds on GitHub. It proves we can ship a working client on stable open-source components and publish the code. The project is no longer actively developed, and its OpenVPN architecture is not the right choice against modern deep packet inspection.

Related services

Mobile app development for the wider iOS and Android delivery work
Mobile app security audit and hardening when the tunnel or API layer needs an independent review
In-app purchases and subscriptions for billing, receipts, and entitlement logic
Mobile app privacy compliance for data collection disclosures and privacy policy work
App Store and Google Play publishing support for review preparation and resubmission

Next step

If your VPN app disconnects, takes too long to connect, or has a listing that promises more than the code proves, send us the app and the last release notes. We will tell you what we would fix first and what it would take.

Contact us with the details of your product, or run your requirements through the Vasilkoff.info estimator for a first scope and cost range.