Too much life to keep everything in your head
Messages, meetings, work, ideas, news, plans and looking after your health all share the same day. That evening it may still feel clear. A month later, it can be hard to remember why you made a decision, when you started feeling tired or what helped you return to a familiar routine.
A personal history gives those details a home. You can revisit an entry, recover the circumstances and pick up a thought without reconstructing the past each time. It also preserves ordinary good things: a walk, a conversation or a small achievement that might otherwise disappear among your tasks.
We see this kind of support as a practical necessity in a world of constant information. You do not have to remember everything by heart when you can record what matters and find it when you need it. A personal knowledge base becomes a way to take better control of your life and look after your attention.
What is lifelogging?
Lifelogging means keeping a history of your life through entries and observations: what happened, how you felt, what you did and what mattered. A journal, photos, calendar, sleep and activity can complement one another. Together, they provide context for the question: how am I living now?
The idea has a history. The MyLifeBits research project at Microsoft Research brought personal documents, photos and other materials into a digital archive with search, links and annotations. Today, you can start your own history with something much simpler: daily events and a few personal notes.
LifeLog brings available sleep, movement, meal, phone and Windows activity data together with calendar plans and your entries in one timeline. Automatic observations provide a starting point; your comments explain what was happening in your life. App usage time alone cannot tell which task you were working on.
Understand your rhythm and wellbeing
Imagine feeling tired at the end of a week. Your journal lets you look back at your sleep, movement, schedule and notes about how you felt. A general impression turns into specific days, events and questions to reflect on.
You can look for recurring patterns: when focus felt easier, which days left room for a walk, or how your routine changed during an important project. Notes about wellbeing help you describe changes and prepare questions for a conversation with a doctor. Events occurring together do not establish a cause, and device data or AI conclusions do not replace a medical assessment.
A personal history also helps you notice what is already working. You can revisit good weeks, recall the conditions that suited you and choose a small next step based on your own experience.
Your journal becomes part of your life knowledge base
A personal knowledge base often holds projects, ideas, goals, important decisions and notes about people. A lifelog adds a sequence of events: what happened before a decision, how you reached it and what followed. A note preserves a thought; a journal preserves the context around it.
For example, a project note can link to the day you discussed a new idea. A monthly review can refer to weeks with a comfortable rhythm. A note about a habit can bring together your observations over time. Individual moments become connected to themes you return to.
Obsidian or another knowledge base that works with Markdown can support this approach. You can keep daily history alongside your notes, link to particular days and write your conclusions separately. Over time, you build personal context: what you have learned and what you have lived through.
A personal AI assistant with your context
When an agent can access your selected entries, you can ask questions grounded in your own history. For example: ‘What have I already tried for this goal?’, ‘Find my notes about how I felt over the last month’ or ‘Help me review the week and suggest a realistic next step’.
The journal gives your assistant events and observations; the knowledge base adds your goals, decisions and conclusions. It can use these to draft a review, find related entries or help reconstruct a line of thought. Ask it to identify the dates and files behind its answer and distinguish your records from its assumptions, so you can check the result.
Working with your own folder requires a separately chosen agent or tool that can read those files. You decide which materials it can access. Start with a relevant topic or period; how selected files are processed depends on the service you use.
LifeLog itself already has an assistant for discussing your day, goals and journal history. This is a separate use case: you arrange access to your external knowledge base, while the built-in AI features use our server and OpenAI.
How LifeLog adds to your knowledge base through Markdown
Your phone creates readable Markdown day files, and the Windows app saves them in your chosen folder. Choose your knowledge base folder, and your LifeLog history sits alongside your notes under LifeLog/YYYY/MM/YYYY-MM-DD.md. You can read it in Obsidian and give your chosen agent access to it as ordinary text files.
The export includes a grouped timeline, summaries of available metrics, your notes and comments, mood and the day-review conversation. This gives you material for personal reflection and follow-up questions without manually rewriting your entire day.
Both your phone and computer must be available to transfer updates. Your phone manages the day files: the next sync replaces edits to those files with the phone version, and Markdown changes are not imported back into the journal. Keep your own conclusions and links to days in separate knowledge base notes. Photos are not currently transferred through this export.
Start with what matters to you
Choose a question that makes keeping a history worthwhile: understanding your routine, preserving ideas, noticing progress towards a goal or remembering important moments. Connect relevant sources and add a short entry about what the numbers cannot explain: how the day felt, what affected your mood and what you want to continue.
Return to your entries when reviewing the week or making a decision. Connect a few days with a goal note, write down an observation and discuss it with your assistant. Your history starts helping when you use it in the present.
Lifelogging helps you preserve what matters and give yourself a clear starting point. Today, you record the context. Later, it helps you remember, understand and choose where to go next.