Sable | Flutter VPN App With NestJS Backend and Next.js Admin Panel

Sable | Flutter VPN App with NestJS Backend and Next.js Admin Panel
Launch your own VPN service on Android and iOS – three complete projects in one package

Sable is a complete, self-hosted VPN platform. Your users get a clean Flutter app for Android and iOS with one-tap connect, WireGuard and V2Ray protocols, split tunneling and a built-in speed test. You get a NestJS + PostgreSQL backend, a node agent for your VPN servers, and a Next.js admin panel to run servers, regions, plans, rewarded ads and push notifications.

Earn from day one with Premium subscriptions through RevenueCat and AdMob rewarded ads that give free users more VPN time. All three projects ship as full source code in one download. Nothing is delivered separately.

Important – Third-Party Services and Possible Costs

Sable is a self-hosted package. You receive the full source code for all three projects, with no licence keys and no subscription payable to us.

Some features connect to third-party services. Those services are not included in this purchase. Each one is billed to you directly by its provider, under that provider’s own terms and pricing.

Please note: buyers are responsible for any and all fees charged by external services. This includes hosting, VPN servers and their bandwidth, developer accounts, app store commissions, email sending and any usage beyond a provider’s free tier. None of these fees are part of the item price, and none of them are collected by us.

• Hosting for the backend and admin panel (required): a VPS or cloud server with Node.js 24 and PostgreSQL 14 or newer. Billed by your hosting provider.
• VPN servers (required): one or more Ubuntu or Debian servers, one per location you offer. Each runs WireGuard and the included node agent. Servers and their bandwidth are billed by your hosting provider. No VPN servers are included.
• Email sending – SMTP (required for email sign-up): OTP codes for sign-up and password reset are sent through any SMTP provider you choose. Many providers have a free tier; usage beyond it is billed by that provider.
• Google Play Developer account (required to publish on Android): USD 25 one-time, paid to Google.
• Apple Developer Program (required to publish on iOS): USD 99 per year, paid to Apple. The paid account is also needed for the Network Extension capability that the iOS VPN tunnel uses.
• Firebase – your own project (optional): Google sign-in (Firebase Authentication), push notifications (Cloud Messaging), Analytics and Crashlytics. You create and maintain your own Firebase project and accept Google’s Firebase Terms of Service. The free Spark plan covers typical usage; usage-based beyond it, billed by Google. The package contains placeholder Firebase files only. Without Firebase, the app runs with email sign-in and these features switched off.
• Payments – Google Play Billing and Apple In-App Purchase through RevenueCat (optional): Premium subscriptions are sold through the app stores. Google and Apple take a commission on every sale, typically 15-30%. RevenueCat manages the store purchases and sends verified webhooks to your backend. It has a free tier and then charges a share of tracked revenue, billed by RevenueCat. You need your own RevenueCat account and API keys.
• Not included – Stripe, PayPal, bKash, Nagad and other payment gateways: this version has no checkout integration for them. bKash and Nagad appear only as switched-off placeholder entries in the database and are not integrated. Adding a gateway is your own development work.
• Advertising – Google AdMob (optional): rewarded and interstitial ads. Free to join and integrate; you earn revenue with your own AdMob account. You are responsible for following AdMob and Google ad network policies and for any costs related to your account or traffic. Only Google’s official test ad IDs are included.
• Image storage – Cloudflare R2 (optional): stores images uploaded from the admin panel. Includes a free tier; usage-based beyond it, billed by Cloudflare.
• Microsoft Clarity and Axiom (optional): session analytics and remote logs. Both are switched off until you add your own project ID or token, and both have free tiers.
• Speed test (free): the built-in speed test uses Cloudflare’s public speed test endpoints by default. You can point it to your own server.

Running a VPN service is regulated in some countries. You are responsible for following the laws of the countries where you operate and offer the app, the terms of your server providers, and the Google Play and App Store policies for VPN apps.

The item price covers the source code and documentation only. To go live you need hosting for the backend and admin panel, at least one VPN server, an SMTP provider, and a Google Play (and optionally Apple) developer account; for Premium subscriptions, your own RevenueCat account; for push notifications and social sign-in, your own Firebase project. Every service marked optional can be left out; the platform runs without it, with the matching feature switched off. Third-party pricing is outside our control and may change, so please check each provider’s current rates before you buy. We support our own code, but we cannot support, waive or refund any third-party fees or account approvals.

Important – Licence of the VPN Core (GPL-3.0)

The VPN tunnel in the mobile app runs on libbox, the mobile library of sing-box, which is licensed under the GNU General Public License v3.0 or later. Parts of the native Android and iOS VPN code are adapted from sing-box-for-android, sing-box-for-apple and shadowsocks-android, also GPL-3.0. Sable is not affiliated with or endorsed by sing-box or SagerNet.

Because of this, the Flutter app’s source code is licensed under GPL-3.0-or-later. You may use, change and publish it, commercially too. When you publish it, you must:

• make the complete source code of your app available to its users under GPL-3.0 (a public link or a written offer);
• include the GPL-3.0 licence and the notices (the app’s About us page is pre-filled with them);
• not name your app after sing-box or suggest any association with it.

The backend and admin panel do not include sing-box; they are licensed under the Envato Market licence you purchase. Full details are in the app’s LICENSE.md, NOTICE, LICENSE-GPL-3.0 and the documentation (section 22). Please read them before you buy.