Curb is an iOS and iPadOS utility that artificially slows your device's own internet connection — to help you save mobile data, reduce doomscrolling, or test how your apps behave on a poor connection. All traffic shaping happens locally on your device. Curb has no user accounts and no backend server of its own.
Information we collect
Curb does not collect, store or transmit any personal data that can identify you. The app has no account, no sign-in and no analytics. We do not collect your browsing history, the websites or services you connect to, the contents of your traffic, or your IP address. The one exception concerns in-app purchases, which are described under Purchases below.
How Curb handles your traffic
To shape your connection, Curb installs a local VPN configuration on your device using Apple's Network Extension framework. This is the only mechanism iOS provides for an app to measure and rate-limit the device's own traffic. The VPN is local only: your traffic is never routed, proxied or tunnelled through any server operated by us — Curb has no servers. Your connections still reach the websites and services you use exactly as they normally would; Curb only applies the bandwidth, latency, jitter and packet-loss limits you choose, on the device itself. The contents of your traffic are never inspected for advertising or analytics, never recorded, and never sent anywhere by us.
Permissions
Curb asks to add a VPN configuration the first time you start throttling, so the on-device packet tunnel can shape your connection. You can disable or remove this VPN profile at any time in the iOS Settings app. Curb requests no other permissions — it does not access your contacts, photos, location or microphone.
What is stored on your device
Curb stores only your own settings locally — your speed presets (download and upload bandwidth, latency, jitter and packet loss), your targeting rules and bundles, the currently active preset, and basic app preferences — using the standard iOS storage in the app's own container. There is no user account and no cloud sync. Live session statistics such as throughput and session totals are shown while a session runs and are not sent off your device.
Purchases
Curb offers one optional in-app purchase, Curb Pro, which unlocks the full set of speed presets, targeting rules and advanced network conditions. It is a one-time purchase, not a subscription. Payment is handled entirely by Apple — we never see or receive your payment details.
To determine whether Curb Pro is unlocked, and to restore it if you reinstall or change device, the app uses RevenueCat, a purchase-management service acting as our data processor. RevenueCat receives an anonymous identifier generated by the app, basic technical information such as your country, platform and app version, and — if you make or restore a purchase — your App Store transaction receipt. This identifier is not linked to your name, email address or Apple ID, and it is not used to track you across other apps or websites.
Because the app checks your purchase status when it starts, this anonymous identifier and technical information are sent to RevenueCat even if you never buy Curb Pro. RevenueCat never receives your browsing history, the traffic Curb shapes, or any information about how you use the app.
Analytics and third-party services
Curb does not use any third-party analytics, advertising SDKs or tracking technologies. The app's traffic-shaping engine is built on Apple's Network Extension framework together with the open-source hev-socks5-tunnel and lwIP libraries, all of which run entirely on your device. The only third-party service Curb uses is RevenueCat, solely to manage the in-app purchase as described above. No information about your traffic or browsing is ever sent to us or to any third party.
Data sharing
We do not sell or rent any personal information, and we never share information for advertising or tracking purposes. Apart from the purchase information described above — processed by Apple and RevenueCat purely to deliver and restore Curb Pro — everything stays on your device.
Children's privacy
Curb is not directed at children and does not knowingly collect personal information from children.
Your rights
Curb keeps your settings only on your device. To remove everything the app has stored, remove the VPN profile in iOS Settings and uninstall Curb.
If you have used Curb Pro and would like the associated purchase record erased, contact us at the address below and we will instruct our processor to delete it. Apple keeps its own record of App Store transactions, governed by Apple's privacy policy rather than ours.
Contact
If you have any questions about this privacy policy, you can contact us at:
Changes
We may update this privacy policy from time to time. Any changes will be posted on this page with an updated "Last updated" date.
Last updated: 20 July 2026