WeakSim Downloads & RevenueWeakSim - Network Simulator · App Store

WeakSim is an iOS weak network simulator. It intercepts device traffic through the system VPN (Packet Tunnel), applying delays, packet loss, bandwidth throttling and other impairments to TCP/UDP packets locally. It reproduces real-world weak network scenarios such as subways, elevators, high-speed trains, and poor signal areas, helping you verify your app's timeout, reconnection, and degradation logic.

Core Features:
- System-level traffic interception: Based on Network Extension Packet Tunnel, all device traffic goes through weak network simulation.
- 9 built-in preset scenarios: 2G / 3G / Weak 4G / Weak Wi-Fi, Subway, Elevator, High Latency, High-Speed Train Disconnection, DNS Timeout.
- Customizable network impairment parameters: Latency & Jitter, Packet Loss, Up/Down Bandwidth Throttling, Reordering, Duplication, Tampering, Periodic Disconnection, DNS Failure / Timeout / Error / Domain Hijacking.
- Multiple network impairment models: Latency supports Uniform / Gaussian / Long-tail distribution; Packet Loss supports Random / Burst mode, closer to real link fluctuation.

Sensitive Data:
- WeakSim does not capture network packets; it only applies impairments such as latency, packet loss, and bandwidth throttling to network packets.
- WeakSim collects metrics such as the number of uplink and downlink packets, traffic volume, and packet loss count, and stores them locally using SQLite without involving any remote servers.

【Auto-Renewable Subscription】
1. Subscription Service:
a) Pro Weekly - Weekly auto-renewing subscription (1 week)
2. Payment: Payment will be charged to your iTunes Account upon confirmation of purchase.
3. Auto-Renewal: Your iTunes account will be charged within 24 hours before the current period ends. Once the charge succeeds, the subscription period will be extended by one term.
4. Cancellation: You can manage or cancel your subscription by going to iPhone Settings → [Your Name] → iTunes & App Store → Apple ID → View Apple ID → Account Settings → Subscriptions. To avoid being charged, cancel at least 24 hours before the end of the current billing cycle.
5. Terms of Service: https://xling-net.github.io/weaksim/terms-of-service.html
6. Privacy Policy: https://xling-net.github.io/weaksim/privacy-policy.html