How Notion iterates AI in production at 100M users, including what they rebuilt and why.
Notion's Token Town: 5 Rebuilds, 100+ Tools
Latent Space with Simon Last and Sarah Sachs 2025
Open latent.space →Log every AI call with its prompt, response, cost, latency, and user feedback; observability tools like Langfuse or LangSmith give you this in an afternoon and turn debugging from guesswork into search. Watch AI-specific metrics, not just usage: task completion rate, retention of AI-feature users versus everyone else, and thumbs-down clusters that reveal failure patterns. Feed real production failures back into your eval set so every incident permanently raises your quality bar.
18 resources.
How Notion iterates AI in production at 100M users, including what they rebuilt and why.
Latent Space with Simon Last and Sarah Sachs 2025
Open latent.space →Last's first outside interview on the practical engineering of a reliable AI product at scale.
AI and I (Dan Shipper, Every) Nov 2024
Listen on Spotify open.spotify.com →A jargon-free primer on what you should be recording and why.
Langfuse 2025
Open langfuse.com →A follow-along tutorial that gets tracing live in your app quickly.
Towards Data Science 2025
Open towardsdatascience.com →A current comparison so you choose once instead of migrating later.
Confident AI 2026
Open confident-ai.com →Explains traces, spans, and generations with the main tools side by side.
Langflow 2025
Open langflow.org →The operations chapter: daily habits of teams that keep LLM features healthy in production.
Eugene Yan, Hamel Husain, et al. Jun 2024
Open oreilly.com →A menu of AI-specific metrics beyond DAUs, from acceptance rate to cost per active user.
Mixpanel 2025
Open mixpanel.com →Includes the killer diagnostic: compare AI-user retention curves against your product baseline.
Institute of Product Management 2025
Open institutepm.com →Connects AI feature metrics to the board-level numbers investors ask about.
SaaS Barometer 2025
Open thesaasbarometer.substack.com →A setup-to-dashboards walkthrough for self-hosting the free stack.
Prismix 2025
Open prismix.dev →An India-based engineering firm's field guide to the metrics and tooling that matter.
CloudRaft (India) 2025
Open cloudraft.io →Monitoring and optimization together, from an India-founded AI quality platform.
Maxim AI (India) 2025
Open getmaxim.ai →Updated adoption frameworks that treat AI feature usage as its own funnel.
Userpilot 2026
Open userpilot.com →Useful for B2B founders whose buyers now ask for AI usage reporting.
Capably 2025
Open capably.ai →Why accuracy alone is a vanity metric and what to track instead.
StackAI 2025
Open stackai.com →The leading open-source LLM observability platform: traces, costs, evals, and prompt management.
Langfuse 2025
Open langfuse.com →The managed alternative, strongest if you already build on LangChain.
LangChain 2025
Open langchain.com →The same ground, over in Build the product, our Starting Up track.