1
Add a Known-Good Server
Create a server profile with host/IP and port. Start with a trusted endpoint before broad testing.
Support
Help and Troubleshooting
Everything needed to get accurate results quickly, from first setup to deeper diagnostics.
If you need direct help, contact chamav@gmail.com.
Android edition: Google Play listing.
Email Support
Typical response time: 1-2 business days.
Quick Start Checklist
Use this flow to avoid the most common setup issues.
2
Verify Reachability
Run a quick server check (or Shortcuts "Test Server") to confirm endpoint availability.
3
Start with Simple Mode
Run an 8/10/15 second test first, then move to Advanced Mode if you need deep tuning.
4
Compare Directions
Check download, upload, and bidirectional patterns to identify asymmetry or bottlenecks.
5
Review and Export
Inspect history and export CSV/JSON when you need to share evidence with your team.
System Requirements
- iOS 16.6 or later (iPhone)
- iPadOS 16.6 or later (iPad)
- macOS 13.5 or later (Mac)
- visionOS 1.0 or later (Apple Vision)
- Android version available via Google Play
- Local network permission for LAN diagnostics
FAQ
Why do I get connection failed errors?
Check hostname/port, ensure the remote iPerf3 daemon is running, and confirm firewall rules allow traffic on the selected port.
When should I use UDP over TCP?
Use UDP for jitter and packet-loss analysis (voice/video scenarios). Use TCP for sustained throughput and retransmission behavior.
What does bidirectional testing help with?
It highlights asymmetric links, congestion, and uplink/downlink imbalance that single-direction tests can hide.
How many parallel streams should I use?
For high-bandwidth links, 4-8 streams often provides a clearer upper bound than a single stream. Validate with your network policy constraints.
Can I run the app as a server?
Yes. Enable server mode in the app, then connect from another iPerf3 client to the displayed device IP and port.
How do I automate tests?
Use Apple Shortcuts actions or open URLs such as iperf3cs://x-callback-url/run-test. Full docs: Shortcuts API.
Where are my results stored?
Locally on device. Nothing is uploaded unless you explicitly export and share the file yourself.
How do I report a bug?
Email chamav@gmail.com with OS version, device model, and steps to reproduce.
Still Need Help?
If your issue is reproducible, include server details, selected protocol, and a screenshot of the final metrics panel.
Thanks for using iPerf3 Client & Server
Product updates are heavily driven by field feedback from engineers and power users.