Quora users ask how fast Speedify really is
In Speedify’s own speed test, two combined 3 Mbps connections ran at 193% the speed of a single connection, which is 96% efficiency, and Speedify held its speed when a connection lost packets, where a plain connection collapsed.
Speedify is an app that combines Wi-Fi, 4G/5G cellular, Ethernet, Starlink and satellite internet connections at the same time for faster downloads and uploads, and keeps you online if one drops. Here are the speed test results in detail.
How do I use WiFi and 4G/5G cellular at the same time with Speedify?
Pick your two internet connections and your device below and we'll take you to the step-by-step setup guide.
Speedify Test Results: 96% Efficiency When Combining Two Connections
At the highest level, Speedify does three things for your Internet connection:
- It lets you combine the bandwidth of multiple Internet connections
- It detects and re-sends lost packets
- It does all this with a VPN twist, encrypting your online traffic to protect your privacy and sensitive data
For the test, Speedify’s team set up two identical 3 Mbps Internet connections with 50 ms round trip latency, then slowly raised the packet loss.
The test compared three software setups:
- 1 Connection, No Speedify: plain TCP on the Internet.
- 1 Connection with Speedify: Speedify running on a single Internet connection.
- 2 Connections with Speedify: Speedify running and allowed to use both Internet connections.
What the test showed:
- Speedify added about 3% overhead to the single connection, making it 0.1 Mbps slower when there was no loss.
- But as the loss increases, the “No Speedify” throughput collapses. At 5% loss the throughput is down to about 25% of full speed, and that much loss is a real scenario on Wi-Fi.
- Speedify protects against this loss: at 5% loss, it still runs at 234% the speed of plain TCP.
- Combining works. Even with no loss, Speedify on two connections ran at 193% the speed of plain TCP on one connection, which is 96% efficiency. That matters most for bandwidth-heavy uses like Twitch gaming and video streaming.
Your mileage may vary, in particular:
- Speedify adjusts to non-identical Internet connections so they can be combined, but as their latencies and speeds get further apart, the efficiency comes down.
- Latency changes how badly packet loss hurts TCP. At higher latencies, Speedify can double your performance at just 1% loss.
- This test is from an early version of Speedify that was tuned for combined speeds of up to 50 Mbps, so read the numbers as an illustration of how combining works, not as current maximums.
- The test did not cover Redundant Mode, which sends copies of your traffic over every connection: throughput is usually lower, but performance is steadier, with less jitter and lower average ping times.
Try Speedify Free with 5 GB per Month
To run your own test, download Speedify and create a free account: the free tier includes 5 GB per month on Windows, macOS, iOS and Android (Linux needs a paid plan). Run a speed test on one connection, then turn on a second internet connection, such as your phone’s 4G/5G cellular next to Wi-Fi, and run it again: with Speedify on, the result reflects both connections working together. Paid plans bought directly from Speedify come with a 30-day money-back guarantee. Speedify encrypts your traffic and keeps no record of the sites you visit, though it does record connection metadata such as your IP address, device ID and data used.
Speedify
Get started with Speedify today.
Speedify combines Wi-Fi, 4G/5G cellular, Ethernet, Starlink and satellite into one faster, more reliable internet connection. Free to try: 5 GB a month with a free account. No credit card required.
🚀 Speed
Faster uploads and downloads, because Speedify uses all your internet connections at once.
📶 Stability
If one internet connection drops, Speedify moves your traffic to the others in milliseconds.
🔒 Security
AES-256 encryption on every internet connection, on any network you join.
15M+ downloads worldwide. 75K+ five-star reviews on iOS and Android.