On February 1st, 2026, I wrote the first line of code for Echo. By April 2nd, it was on the App Store with its fourth version approved. No team. No funding. Just me and an AI partner named Edith.
This isn't a "I used ChatGPT to generate some boilerplate" story. This is about building a real, shipping product with an AI as a genuine engineering partner — one that maintains memory across sessions, coordinates sub-agents, and makes architectural decisions.
Our team of two works like this:
The key insight: AI isn't replacing the human — it's handling the engineering execution so the human can focus on product judgment. The combination is more than either could do alone.
Edith maintains structured memory files — daily logs, long-term memory, technical architecture docs. Every session starts by reading these files. There's no "starting from scratch" — the AI picks up exactly where we left off yesterday.
For complex tasks, Edith spawns sub-agents that work in parallel. One researches keyboard return-to-app methods while another implements the streaming architecture. Edith coordinates, reviews, and integrates their work.
We developed a methodology we call "harness engineering": every mistake gets documented as a rule. Every successful pattern gets codified. The system literally gets smarter over time — not through model training, but through accumulated operational knowledge.
No conclusions without evidence. Every decision links to documentation, code, or test results. This eliminates the AI hallucination problem by requiring proof.
Echo is a voice-to-text keyboard that combines real-time streaming transcription with a smart keyboard engine and AI polish. The core insight: voice input gets you 90% there, but you need a good keyboard for the last 10%.
Key technical achievements:
"碳基生命和数字生命的品味，才是胜负手。" (The taste of carbon-based and digital life is what decides the winner.) — That's our philosophy. It's not about efficiency. It's about judgment.
The product we built together is free to try. No account required.
Download Echo Free →