BYOAIK — Bring Your Own AI Key: a directory of AI tools that run on your own API key.

Microsoft Prompt Flow

Microsoft's prompt engineering and evaluation toolkit, where your provider key is registered as a local connection.

Website Source code

Category:
Prompt Engineering Tools
Pricing:
Open Source
Open source:
Yes (MIT)
Self-hostable:
Yes
Local-first:
No
Platforms:
Library/SDK, CLI, VS Code Extension, Self-hosted, Docker
AI providers (bring your own key):
OpenAI, Azure OpenAI, Custom / OpenAI-compatible
API key storage:
Configured by environment variable
Key risk level:
LOW
Trust score:
78/100

Prompt flow is Microsoft's open-source toolkit for prototyping, testing, tuning and evaluating prompt flows, with a VS Code extension plus a Python SDK and CLI. You create local connection files holding your own credentials and flows reference those connections by name, so keys stay on your machine and are never proxied through a Microsoft service. Installed with pip. MIT licensed, 11,218 stars, last commit about three months before review.

Why this trust score (78/100)

Trust measures how the tool treats your API key and how much of that has been verified. It contains no popularity signal.

  • Key Safety 22/25 — The key is supplied by an environment variable or local config file you control.
  • Request Routing 17/20 — Requests go straight from you to the AI provider.
  • Transparency 20/20 — Source is public under MIT, so anyone can check how the key is handled.
  • Privacy 10/15 — Can be self-hosted, so the data path stays inside infrastructure you control.
  • Maintenance 8/10 — Commits within the last six months.
  • Verification Confidence 1/10 — Compiled from public documentation by an AI-assisted pass, not independently confirmed.

What was checked

Verification tier: RESEARCH_ASSISTED — derived from the evidence below, not set by hand.

  • [CONFIRMED · SOURCE_SCAN] Most recent commit 2026-05-14 — about 3 month(s) ago. source

How your API key is handled

Your API key is supplied via an environment variable or local config file. Requests are sent directly to the AI provider. Because it can be self-hosted, your key never has to touch a third-party backend.

Setup

Install the tool, set your provider API key as an environment variable (or in its config file), and pick a model.