A free, open-source Windows chat client for Duck.ai — DuckDuckGo's AI chat service — with built-in proxy discovery and automatic rotation. No API key required.
- Free AI chat — talks directly to Duck.ai with no account or API key
- Multiple models — GPT-4o mini, Claude 3 Haiku, Llama 3.1 70B, Mixtral 8x7B, o3-mini
- Automatic proxy discovery — tests tens of thousands of fresh proxies in parallel
- Automatic proxy rotation — switches proxy silently on 418 / rate-limit errors
- Dark-themed WinForms UI — live streaming response display
- Console client —
DuckStudiofor headless / scripted use - No browser required — VQD bot-detection challenge solved entirely in C#
| Project | Type | Description |
|---|---|---|
ChatFreePT |
WinForms app | GUI client with proxy controls |
DuckStudio |
Console app | CLI client |
ProxyPool |
Class library | Proxy discovery, testing, and rotation engine |
- Windows 10 / 11
- .NET 10 SDK
git clone https://github.com/yourname/ChatFreePT.git
cd ChatFreePT
dotnet run --project ChatFreePT
Or open ChatFreePT.sln in Visual Studio and press F5.
┌─────────────────────────────────────┬──────────────────────────┐
│ │ Proxy │
│ │ Proxy Sources │
│ Chat window │ Discovery Settings │
│ │ Connection │
│─────────────────────────────────────│ │
│ Message input [Send] │ │
└─────────────────────────────────────┴──────────────────────────┘
| Control | Purpose |
|---|---|
| Use Proxy checkbox | Enables the proxy subsystem |
| Find Proxies | Downloads and tests proxies from the selected sources |
| Stop | Cancels an in-progress discovery run |
| Progress bar + counters | Live working / tested counts, refreshed every 250 ms |
| Found proxies list | Top working proxies ranked by reliability score |
Tick any combination of the 13 built-in lists before clicking Find Proxies:
| Source | Protocol | On by default |
|---|---|---|
| TheSpeedX | HTTP | ✓ |
| TheSpeedX | SOCKS4 / SOCKS5 | |
| ShiftyTR | HTTP | ✓ |
| ShiftyTR | SOCKS4 / SOCKS5 | |
| clarketm | HTTP | |
| monosans | SOCKS4 / SOCKS5 | |
| monosans anonymous | SOCKS4 / SOCKS5 | |
| roosterkid | SOCKS4 / SOCKS5 |
| Setting | Range | Default | Effect |
|---|---|---|---|
| Parallel | 1 – 500 | 200 | How many proxies are tested simultaneously |
| Timeout (s) | 1 – 120 | 3 | Per-proxy connection timeout |
| Delay (ms) | 0 – 10 000 | 0 | Pause between starting each new test (throttles bandwidth) |
| Button | Action |
|---|---|
| Connect | Opens a Duck.ai session using the best available proxy |
| Cancel | Aborts a connection attempt mid-flight |
| Next Proxy | Marks the current proxy as failed and reconnects with the next one |
| Reconnect | Re-initialises the session on the same proxy |
| Clear Chat | Wipes the display and resets conversation history |
| Export | Saves the conversation to a timestamped .txt file |
- Enter — send message
- Shift + Enter — new line in the input box
- Responses stream in token-by-token
| Model | ID |
|---|---|
| GPT-4o mini | gpt-4o-mini |
| Claude 3 Haiku | claude-3-haiku-20240307 |
| Llama 3.1 70B | meta-llama/Meta-Llama-3.1-70B-Instruct-Turbo |
| Mixtral 8x7B | mistralai/Mixtral-8x7B-Instruct-v0.1 |
| o3-mini | o3-mini |
dotnet run --project DuckStudio
Use proxies? (y/n): y
Finding and testing proxies, please wait...
[INFO] √ Found working proxy: 1.2.3.4:8080 (Http)
...
Ready: 14 working proxies found.
Connected to Duck.ai successfully!
Commands: quit, clear, reconnect, models, model:<name>, export
YOU: explain quantum entanglement simply
Duck.ai: ...
Commands
| Command | Action |
|---|---|
quit |
Exit |
clear |
Clear conversation history |
reconnect |
Re-initialise Duck.ai session |
models |
List available models |
model:<name> |
Switch model, e.g. model:gpt-4o-mini |
export |
Print conversation to stdout |
ProxyPool is a standalone class library you can use in any .NET project.
using ProxyPool;
var pool = new ProxyEnabledHttpClient(
proxyListUrls: new[]
{
"https://raw.githubusercontent.com/TheSpeedX/PROXY-List/master/http.txt",
"https://raw.githubusercontent.com/ShiftyTR/Proxy-List/master/http.txt",
},
testTimeoutSeconds: 3,
fetchTimeoutSeconds: 20,
maxParallelTests: 200);
// Discover working proxies in the background
await pool.DiscoverProxiesAsync(
onProgress: (tested, working) => Console.WriteLine($"{working} working / {tested} tested"),
cancellationToken: cts.Token);
// Pick the best proxy
WebProxy? proxy = pool.GetBestProxyWebProxy();
// Or fetch a URL through the pool with automatic rotation
string html = await pool.FetchHtmlAsync("https://example.com");| Member | Description |
|---|---|
DiscoverProxiesAsync(onProgress, delayBetweenStartsMs, ct) |
Test all proxies from every configured source URL |
GetBestProxyWebProxy() |
Best single proxy by reliability score |
GetHealthyProxyWebProxies(max) |
Top N proxies |
GetStatistics() |
Pool-wide stats: total, healthy, top-10 details |
FetchHtmlAsync(url, ct) |
Fetch a URL through the pool with automatic failover |
ReportProxyFailure(address) |
Manually mark a proxy as failed |
Duck.ai uses a JavaScript-based bot-detection token called a VQD. ChatFreePT solves it entirely in C# without a browser or JS runtime:
- Fetches the obfuscated challenge script
- Extracts and rotates the string table
- Builds a deobfuscation lookup map
- Simulates a DOM fingerprint using AngleSharp
- Hashes the fingerprint with SHA-256
- Base64-encodes the final token and sends it with every chat request
- The pool scores each proxy with a reliability percentage based on success / failure history and average response time
- On a 418 I'm a Teapot (DuckDuckGo's rate-limit response), the client automatically marks the proxy as failed and retries with the next-ranked one
- Rotation also happens silently during initialisation — if one proxy can't complete the full handshake (cookie, chat page, auth token, VQD), the next one is tried automatically
All long-running work runs off the UI thread via Task.Run:
- Proxy discovery (
DiscoverProxiesAsync) - Duck.ai session initialisation (
EnsureInitializedAsync) - Message streaming (
StreamAskAsync)
Progress is polled by a 250 ms System.Windows.Forms.Timer on the UI thread, so background threads never block waiting for UI updates.
| Package | Used by | Purpose |
|---|---|---|
| AngleSharp | DuckStudio, ChatFreePT | HTML parsing for VQD DOM fingerprint |
| PuppeteerSharp | DuckStudio | Browser mode (optional) |
MIT — see LICENSE for details.
