Gradient Bang vs Relay: Features, Pricing & Which Is Better (2026)
A side-by-side comparison of Gradient Bang and Relay — features, pricing, and ideal use cases — to help you decide which AI tool fits your workflow.
Gradient Bang
Pipecat AI
A multiplayer space-trading game universe where every entity (ships, NPCs, systems) is driven by LLM-powered AI agents.
Key features
- LLM-Driven Agents: Core gameplay entities (ships, NPCs, systems) are implemented as language-model agents that make decisions, communicate, and act autonomously in the game world.
- Multiplayer Universe Orchestration: A networked environment combining player actions and agent behaviors with server-side orchestration (Supabase, edge functions, and environment configuration) for persistent multiplayer interactions.
- Asset Pipeline (/newspaper): A scriptable content generator that drafts copy and renders visual assets (e.g., 2048×1024 news banners, front pages) via specialized rendering scripts with outputs stored under artifacts/ for community and in-game use.
- Multi-LLM Support & Config: Pluggable LLM provider configuration (examples reference Gradium, Cartesia, Claude, Gemini, etc.) with environment-driven keys and settings to swap or benchmark different models.
- Developer Tooling & Local Dev: Local development scripts and instructions (Supabase local start, edge function serving, env templates) to run the bot, seed data, and iterate on game logic, plus automated unit and integration test scripts.
- Context Inspection & Debugging: Companion tools (gb-context-viewer) to upload and inspect LLM context dumps produced by the game, aiding debugging and analysis of agent decisions and prompts.
- Benchmarking Suite: A separate benchmarks repo (gb-benchmarks) providing structured multi-agent tasks, metrics, and comparisons across different LLMs for performance and orchestration evaluation.
- Configurable Gameplay Mechanics: Exposed runtime environment variables (combat ticks, shield regen, move delays, spawn distances, credits, etc.) for fine-grained tuning of game balance and simulation parameters.
- LLM-driven agents for all in-game entities (player ships, NPCs, subagents)
- Newspaper asset pipeline: single /newspaper entrypoint that renders banners and front pages to artifacts/ (PNG output, e.g. 2048×1024; supports --size override)
- Client-side GB Context Viewer (web app) to upload/paste and inspect LLM context JSON dumps (built with Vite/TypeScript)
- Benchmark repository (gb-benchmarks) for multi-agent task evaluation and model comparisons
- Configurable runtime via .env files and env.example templates (.env.bot, env.supabase.example, etc.)
- Persistence and auth integrations: Supabase (SUPABASE_URL, SUPABASE_ANON_KEY, SUPABASE_SERVICE_ROLE_KEY) and Postgres (POSTGRES_POOLER_URL)
- Edge API runtime and token-based orchestration (EDGE_API_TOKEN, X-Edge-Auth, app_runtime_config.edge_api_token)
- Pluggable LLM and TTS providers (examples: gradium, cartesia) with provider selection via env variables (TTS_PROVIDER etc.)
- Server/game tuning parameters exposed as env keys (MOVE_DELAY_SCALE, MOVE_DELAY_SECONDS_PER_TURN, COMBAT_TICK_BATCH_SIZE, COMBAT_ROUND_TIMEOUT, SHIELD_REGEN_PER_ROUND, SALVAGE_TTL_SECONDS, CHARACTER_STARTING_CREDITS, CORPORATION_SHIP_OWNER_CAP)
- CI automation and tests using GitHub Actions (workflows included in repository)
- Polyglot codebase: Node/Vite/TypeScript front-end, Python components (pyproject.*), and nix development shells (shell.nix)
Best for
- Emergent Multiplayer Gameplay: Running a public or private server where human players explore, trade, form corporations, and battle while interacting with autonomous LLM-controlled ships and NPCs.
- LLM Behavior Research: Using the project's multi-agent benchmarks and context dumps to evaluate and compare different language models on coordination, task completion, and in-world decision making.
- Automated Asset Production: Generating community-facing visual and textual assets (news banners, front pages, prompt experiments) for announcements, lore, or marketing using the `/newspaper` pipeline.
- Development & Modding Sandbox: Self-hosting the codebase locally to modify game mechanics, tune environment variables, add new agent scripts, and run automated tests for iterative development.
- Debugging Agent Interactions: Uploading LLM context dumps into the gb-context-viewer to inspect prompts, agent state, and message history to diagnose unexpected behaviors or improve system prompts.
- Benchmarking Orchestration Designs: Running the gb-benchmarks scenarios to measure orchestration latency, success rates, and cost/performance trade-offs across LLM providers for multi-agent systems.
- Play and experiment in a multiplayer universe powered by LLM-controlled agents (explore/trade/battle/collaborate)
- Generate retro-digital visual assets (news banners, front pages) programmatically for community or in-game content
- Inspect and debug LLM context and agent state using the GB Context Viewer
- Research and benchmark multi-agent orchestration and LLM behavior across providers
- Develop and extend the game server or agents using provided env templates, CI workflows, and open-source code
R
Relay
Relay
AI phone receptionist that builds itself from a business's website to answer every call and book, reschedule, or cancel appointments 24/7.
Key features
- One-Click Build: Paste a website and Relay drafts the agent profile, knowledge base, prompt, and call wiring in about 38 seconds.
- 24/7 Call Answering: Picks up every call day or night in the caller's local time, with no voicemail or hold music.
- Real Calendar Booking: Checks live availability and writes appointments, reschedules, and cancellations directly to the business's existing booking system.
- Booking Integrations: Connects to 7+ systems including Google Calendar, Square, Calendly, Outlook, Housecall Pro, Workiz, and Vagaro with one sign-in.
- Grounded Answers: Answers caller questions from the business's own facts and knowledge base rather than guessing.
- No-Config Setup: Requires no dashboards, prompt engineering, or manual call-flow building.
Best for
- Missed-Call Recovery: Capture bookings from calls that would otherwise ring out when staff are busy or closed.
- Appointment-Based Businesses: Let salons, clinics, and home-service providers automate booking, rescheduling, and cancellations by phone.