When Heimdall first launched, it was an “OpenAI GPT” that users accessed through ChatGPT. We chose this approach for its $0 inference cost, user familiarity, and the perceived ease + speed of development. However, in hindsight, this proved to be a mistake, plagued by issues like constant end-user approval prompts, a cumbersome OAuth experience (especially on mobile), unreliable desktop link generation, and an overall poor user experience. As a result, we completely rebuilt Heimdall as version 2.0 using Vercel’s AI SDK and GPT-4o-mini, and it’s much improved. You no longer need a ChatGPT account to get started, there’s no more dealing with repeated confirmation prompts, broken links, or mobile sign-in issues. The integration with the Gandalf SDK, which powers data retrieval from services like Amazon and Instacart, is now even smoother. Heimdall 2.0 can answer questions like: • How much have I spent on a specific service or category? • What categories of products do I buy the most on Amazon or Instacart? • How does my spending compare this year to last year? • How often do I use services like Uber or Booking? • Can you show me a pie chart or bar chart of my spending in different categories? • How do my spending habits differ between services? • Can you provide insights or recommendations based on my spending data? Try it out! Let us know what you think.