T3 Cloneathon & Community Clones Research: t3-cloneathon, omnichat, NotT3Chat & TomDoesTech/t3-chat (2026)

This document provides the file-and-symbol-anchored audit of 4 additional T3 repositories cloned in ~/dev: lulkebit/t3-cloneathon (99eb9ab1), guitaripod/omnichat (b864415e, 3rd Place T3 Cloneathon Champion), shaltielshmid/NotT3Chat (913afaae), and TomDoesTech/t3-chat (4cc8fac3). It details t3-cloneathon’s parallel Multi-Model Consensus SSE fan-out and Flesch-Kincaid ResponseQualityAnalyzer, omnichat’s Cloudflare D1 Battery Unit (1 BU = $0.001) billing ledger and tree-branch divergencePoint comparison, NotT3Chat’s single-file C# .NET 10 SignalR SemaphoreSlim(1) zero-drop mid-stream multi-tab join and 1024-slot n-gram RepetitionGuard, and TomDoesTech/t3-chat as a taxonomic control case (create-t3-app human WebSocket chat).

1. lulkebit/t3-cloneathon (~/dev/t3-cloneathon — Multi-Model Consensus & Quality Analytics)

• Commit SHA: 99eb9ab16c9349e9973138b5b71b0af5e9d70b8b
• Stack Clarification: Although branded "convex-chat" in package.json and README.md, its backend is Next.js 15.3.8 App Router + Supabase Auth/PostgreSQL/Storage (@supabase/supabase-js ^2.50.0) + OpenRouter (zero Convex dependencies).
• PostgreSQL Schema (LOCAL_TESTING_GUIDE.md:97-262 & src/types/chat.ts): profiles (openrouter_api_key), conversations (model stores "consensus:modelA,modelB,..."), messages (content stores JSON-serialized ConsensusResponse[] in consensus mode), attachments, and message_quality_metrics.
• Multi-Model Consensus SSE Fan-Out (src/app/api/chat/consensus/route.ts, src/components/ConsensusMessage.tsx):
  • Dispatches models.map(...) in parallel via Promise.all(modelPromises) over a single multiplexed ReadableStream SSE response emitting consensus_start, per-model consensus_update ({ modelIndex, model, content, isStreaming }), consensus_complete (with responseTime and qualityMetrics), consensus_error, title_update, and consensus_final.
  • ConsensusMessage.tsx toggles between Stacked View (List) and Side-by-Side Grid View (Grid3X3, 1–4 columns) with average response latency metrics.
• Heuristic ResponseQualityAnalyzer (src/lib/response-quality-analyzer.ts & /api/quality-analytics):
  • Computes a 0–100 qualityScore = relevance * 0.3 + clarity * 0.25 + coherence * 0.2 + completeness * 0.2 + readability * 0.05 (minus latency/brevity penalties) using Flesch Reading Ease (206.835 - 1.015*(words/sentences) - 84.6*(syllables/words)), 19 logical connectors, structural markdown regexes, lexical repetition ratio, and prompt keyword overlap.
  • GET /api/quality-analytics (src/app/api/quality-analytics/route.ts) aggregates message_quality_metrics over 7d/30d/90d windows into daily trends, per-model rankings, and 5-tier quality distributions (excellent, good, fair, poor, veryPoor).

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2. guitaripod/omnichat (~/dev/omnichat — 3rd Place T3 Cloneathon Champion)

• Commit SHA: b864415e55ba3e4bb3489b06919e405031b8bb8a
• Stack: Next.js 15.3.3 Edge (runtime = 'edge'), Cloudflare Pages/Workers + D1 (SQLite via Drizzle ORM 0.44.2, 13 tables in src/lib/db/schema.ts) + R2 (R2_STORAGE), Clerk (web /api/*) + native Apple Sign-In JWT (/api/v1/*), Stripe, and 6 direct AI providers (openai, anthropic, google, xai, deepseek, ollama).
• “Battery System” Pay-Per-Use Token Billing Ledger (src/lib/battery-pricing.ts, src/lib/usage-tracking.ts, src/services/ai/stream-wrapper.ts):
  • Defines 1 Battery Unit (BU) = $0.001 (150% markup + 30% safety buffer over provider token rates: e.g., gemini-1.5-flash = 0.61 BU/1K, gpt-4.1-mini = 3.25 BU/1K, claude-sonnet-4 = 29.25 BU/1K, claude-opus-4 = 146.25 BU/1K, local Ollama = 0 BU).
  • Pre-flight check (checkBatteryBalance in src/app/api/chat/route.ts:219) returns HTTP 402 Payment Required when totalBalance < estimatedCost.
  • createTokenTrackingStream (stream-wrapper.ts) counts streamed tokens via StreamingTokenTracker and on stream finish executes a 4-step D1 write (trackApiUsage in usage-tracking.ts:130-198): (1) insert api_usage, (2) decrement user_battery.total_balance, (3) append signed row to battery_transactions (balance_after), (4) upsert daily_usage_summary, then emits a final data: {"type":"usage","usage":...,"battery":{"batteryUsed":...,"newBalance":...}} SSE frame before data: [DONE].
• Tree Branching & divergencePoint Comparison (src/services/branching/branch-manager.ts, src/components/chat/branch-comparison.tsx):
  • BranchManager.buildMessageTree constructs a MessageNode tree from messages.parent_id (main, main-<msgId>-0), and BranchComparison renders a multi-column side-by-side comparison modal across any N selected branches, automatically computing divergencePoint to visually separate shared prefix history from divergent branch responses.
• Dual-Mode Ollama (src/services/ai/providers/ollama.ts, ollama-client.ts) & Offline Sync (offline.ts, sync.ts):
  • OllamaClientProvider talks directly from the browser to http://localhost:11434/api/chat, bypassing the Cloudflare Worker edge route and battery ledger (isOllamaModel).
  • SyncService queues offline mutations in IndexedDB (omnichat-offline v1 syncQueue) and replays them on window.addEventListener('online') with 3 retries.
• Go CLI API Validator (go-cli/cmd/omnichat-validator/main.go): Validates all 43 OpenAPI endpoints (openapi/openapi.json) across 10 categories using --clerk or --bearer JWT auth.

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3. shaltielshmid/NotT3Chat (~/dev/NotT3Chat — C# .NET 10 + SignalR + RepetitionGuard)

• Commit SHA: 913afaaea495a63076bf085d66597ca0f98a7b04
• Stack: Single-file 1,147-LoC C# 12 / .NET 10 (net10.0) ASP.NET Core backend/Program.cs + SignalR (ChatHub at /chat, MaximumReceiveMessageSize = 64 KB) + EF Core SQLite + IMemoryCache + LlmTornado 3.8.26 (10 providers) + ExaApiService + React 19 (streamdown 1.4.0 with parseIncompleteMarkdown={true}).
• Zero-Drop Mid-Stream Multi-Tab Join via SignalR Groups + SemaphoreSlim(1) (backend/Program.cs:623-707, 750-795):
  • In-flight streams are cached in _memoryCache under convoId as StreamingMessage(StringBuilder SbMessage, NotT3Message Message, SemaphoreSlim Semaphore, CancellationTokenSource Ct).
  • When a client refreshes or opens an active chat in a second tab (ChooseChat(convoId) while conversation.IsStreaming == true), the hub acquires await currentMsg.Semaphore.WaitAsync(), sends BeginAssistantMessage + the accumulated currentMsg.SbMessage.ToString() via NewAssistantPart, and adds the connection to the convoId SignalR group before releasing the semaphore—guaranteeing zero dropped or duplicated tokens at the join boundary.
• 1024-Slot Power-of-2 Ring-Buffer RepetitionGuard (backend/Program.cs:1080-1145):
  • Uses a fixed ring buffer (BufferSize = 1024, bitmask ModuloNumber = 1023, [MethodImpl(MethodImplOptions.AggressiveInlining)]) of token hash codes (token.GetHashCode()) to detect both single-token loops (MaxTokenRep = 32) and repeating n-gram cycles of period p ∈ [3, 12] (MinGramRep = 5), automatically cancelling streamingMessage.Ct when a model enters a degeneration loop.
• Inline <think> & <WebSearch> Tag Interleaving & Context Sanitization (backend/Program.cs:554-586, 629-670):
  • Streams <think>...</think> and <WebSearch>[...]</WebSearch> inline (capping Exa calls at totalSearches < 3 per turn). On subsequent turns, CleanMessageFromSpecialEntities strips <think>[\S\s]*?</think> and replaces <WebSearch>.*?</WebSearch> with [web_search was called, results removed to save context.] while escaping prompt-injection tokens (<|im_start|>, <tool_call>).

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4. TomDoesTech/t3-chat (~/dev/t3-chat-tomdoestech — Taxonomic Control Case)

• Commit SHA: 4cc8fac3ec947e7b9889588ff292d66862b0c5b0
• Taxonomic Role: Created in July 2022 (prisma/migrations/20220717035410_init) as a create-t3-app (“T3 Stack”) tutorial project, this repository is a human-to-human WebSocket chat room app, not an AI assistant clone of t3.chat.
• Architecture: Next.js 12.2.1 Pages Router + tRPC v9 (httpBatchLink on :3000 + wsLink on :3001 via src/server/wsServer.ts applyWSSHandler) + Prisma 4 SQLite + NextAuth.js 4. Chat messages are ephemeral in-memory events bridged via a Node EventEmitter (room.send-message mutation → ctx.ee.emit → room.onSendMessage trpc.Subscription).