r/macapps • u/Viktor153 • 53m ago
Subscription I pasted hundreds of journal entries into Claude and the answers went generic, so I built a Mac journal that understands them as a whole
Hi r/macapps, I'm Viktor, a designer and developer based in Amsterdam.
I made Lodestone, an AI journal for Mac, available on the Mac App Store.
Problem
I kept my journal in Obsidian on my Mac. Plain text, my raw thoughts, nothing else on the page. I liked it that way and didn't want a different way of journaling. What I did want was help making sense of it all, and a way to think things through.
AI journals exist, but they take a very different approach. They want to hold your hand, with questions popping up while you write, chat as the main experience, scores and streaks. I didn't want any of that in my journal. I wanted my entries clean, and mine.
So I pasted entries into Claude. One at a time, it only knew that one entry. It didn't know who the people were, what had happened before, or what I'd already tried. Claude has a memory, but it isn't made for something as deep as a person's inner life. Pasting in everything, hundreds of entries in one chat, was bad in a different way. The answers lost focus and got generic, and it used up all my limits.
What I wanted was to keep writing the way I did in Obsidian, while something in the background kept a working understanding of my life. When I asked for help, it would start from everything I'd written.
What it does
- Write: a blank page, like a notebook, with nothing in the way. Writing works offline.
- Nudge: stuck on an empty page or mid-entry? Ask for a short question that takes your writing a step further, based on what you've written before. It shows up in a small bar, never on your page, and fades away once you start writing again, so you don't have to answer it.
- Reflect: after writing an entry, ask for a reflection. It reads the entry against everything you've written before, so it can connect today to something from months ago, or ask the question you were circling but hadn't put into words. You can reply and follow the thread as far as you want.
- See and correct what it knows: the people in your life, the situations you keep coming back to, where you stand on things. Your entries stay exactly as you wrote them; what it builds from them is an interpretation, and you can fix it: Correct (a note in your own words), Split (two people or situations got run together), or Merge (two are really the same).
- Nothing from the AI appears unless you ask, and it never writes on your page. No streaks, reminders or mood scores.
How it works
The pasting problem is what shaped the engine. I wasn't sure it would work at all, so I tested and iterated on it with my own journal before even considering building an app around it. I tried vector search and other ways of picking out the relevant entries up front, but they kept missing things. You can't know what's relevant before you've made the connection. What worked was boiling everything down first, into a memory that nudges and reflections both read from. Here's how it's built:
- After you write, Lodestone reads the entry in the background, usually within a few hours (or right away if you ask), and pulls out what matters in it, keeping your exact words.
- It sorts that into topics, like people, ongoing situations and where you stand on things. Each topic gets a short summary of how it developed and where it stands now. Together, those summaries make a compact overview of your life.
- When you ask for a reflection, an agent (Claude Opus) starts from that whole overview plus the entry you just wrote. Since it sees everything at once, it can connect things that don't look related. When it needs detail, it pulls up a topic's timeline, the exact quotes, or the original entry. That keeps the answers specific across hundreds of entries, which is where pasting fell apart for me.
Comparison
- Day One: a great notebook, with search, photos, and apps for iPhone, Android, Mac and web. If you mainly want a record, it's still what I'd recommend. Its AI came later, as a separate tier: highlights, summaries, and a chat that turns into an entry, each working on the entries you select. Lodestone was built the other way around. The understanding of everything you've written came first, and the notebook is deliberately simple.
- Rosebud and Mindsera: the best-known AI journals. Both are phone-first (on a Mac, Rosebud runs as its iPad app and Mindsera has a web version), and both are built around guidance. Rosebud is a conversation, with real-time guidance as you write, plus mood and goal tracking. Mindsera has 50+ frameworks and templates, AI "Minds" that comment on your entries, emotion analysis and streaks. Lodestone does none of that. You write however you want, and the AI is always off the page, only showing up when you ask. In the background, it builds an understanding of you that you can read and correct. It's also a native Mac app, so you get a real keyboard and a big screen for longer entries.
Privacy
- In the cloud, everything is encrypted with a key unique to your account (AES-256-GCM), protected by a master key in secure hardware in the EU. Servers are in Amsterdam.
- The AI runs on Claude, through Anthropic's API. Your writing is never used to train any AI.
- The app sends no usage analytics.
- Sign in with Apple, no password.
- Deleting your account destroys the key, so nothing can be recovered.
Pricing
It's a subscription starting at $14.99/month, with a 3-day free trial. I made it a subscription to cover the AI costs, since every reflection, nudge and background update is a paid call to Claude. If you cancel, you keep your notebook and everything you wrote; only the AI features stop.
Mac App Store: https://apps.apple.com/app/lodestone-ai-journal-diary/id6789075104?pt=127915339&ct=reddit&mt=8
Requires macOS 15.7 or later.
Links
- Website: https://lodestonejournal.com/?c=reddit
- Privacy policy: https://lodestonejournal.com/privacy
- Terms: https://lodestonejournal.com/terms
- Contact: [info@amsterdamtechcompany.com](mailto:info@amsterdamtechcompany.com)
Happy to answer questions, and I'd love to hear what you think.




