Now with API tool calling

Build AI assistants that actually work for your team.

Prompt Studio lets you train custom AI assistants on your documents, connect them to your internal APIs, and chat with them over text, images, audio and files — all from one secure workspace.

No credit card required Encrypted API keys 200+ models via OpenRouter
Prompt Studio — Assistant: Support Bot
Can you create a refund ticket for order #4821 and notify finance?
I'll run two tools for that:
create_refund_ticket → #RF-1187 · status: pending
send_email → awaiting your confirmation
Refund ticket created. Want me to notify finance@company.com?
Ask the assistant anything…

Trusted by teams automating with

NorthwindAcme CorpGlobexInitechUmbrellaStark Labs

Features

Everything you need to ship a reliable assistant

From first prompt to production tool-calling — one workspace covers the whole journey.

Visual assistant builder

Configure persona, instructions, temperature, token limits and few-shot training examples — no code, no YAML.

Knowledge bases

Upload PDFs, Word docs, CSVs and markdown into organized folders. Your assistant answers from your real documents.

API tool calling

Register REST endpoints as tools. The assistant decides when to call them — and asks before any write action.

200+ models

Route to GPT, Claude, Gemini, Llama and more through OpenRouter. Swap models per assistant with one dropdown.

Multi-modal chat

Send images, audio, video and documents in chat. Vision models analyze screenshots instantly.

Secure by design

Encrypted API keys, hardened admin auth with throttling, session protection and confirmation-gated actions.

How it works

Live in three steps, not three sprints

01

Create & configure

Name your assistant, set its persona and pick a model. Tune temperature and response length to fit the job.

02

Train & connect

Add Q&A examples, attach knowledge base documents and register the API endpoints it should be able to call.

03

Chat & automate

Talk to it with text, images and files. It calls tools on demand and always asks before write actions.

Pricing

No subscriptions. Pay as you go.

Top up your workspace balance and pay $0.05 per AI message. Unused credit never expires.

$5.00 free starter credit on sign up

Starter

Perfect for kicking the tires.

$10 one-time

$10.00 of credit

≈ 200 messages

  • Unlimited assistants & members
  • All models via OpenRouter
  • Knowledge base & API tools included
  • Credit never expires
Top up with Starter
Includes $7.50 bonus

Team

Best value for growing teams.

$50 one-time

$57.50 of credit

≈ 1,150 messages

  • Unlimited assistants & members
  • All models via OpenRouter
  • Knowledge base & API tools included
  • Credit never expires
Top up with Team
Includes $30.00 bonus

Business

Serious usage, serious savings.

$150 one-time

$180.00 of credit

≈ 3,600 messages

  • Unlimited assistants & members
  • All models via OpenRouter
  • Knowledge base & API tools included
  • Credit never expires
Top up with Business

FAQ

Questions, answered

Any model available through OpenRouter — OpenAI GPT, Anthropic Claude, Google Gemini, Meta Llama, Mistral and 200+ more. Each assistant picks its own model from a dropdown.
Upload files to the knowledge base, organize them in folders, then attach them to an assistant. Relevant content is injected into the prompt as grounded reference material.
Yes. Register REST endpoints as tools. The assistant calls them mid-conversation, and for any write action (create, update, delete) it pauses for your confirmation first.
API keys are encrypted at rest, admin access is rate-limited and session-hardened, and your documents are only ever sent to the model provider you configure for that assistant.

Your team's first AI teammate is one prompt away.

Spin up a trained, tool-connected assistant in minutes. Free to start, no card required.