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Moon
AI Mood Tracker. See what fills your mood and what drains it
Moon is a mood diary for iPhone — and a mood tracker that never gives you advice. Its whole value is in surfacing the factors behind your mood — so you can, in the end, make it better. No account, no sign-up.
It started with prompts, not with an app. For more than six months I was writing, debugging and testing prompts that could get an AI to read my own entries and find the patterns in them — what fills my mood and what drains it. Most of that time went into the debugging and the testing: getting the model to stop inventing, to stop handing out advice, and to stay with what I had actually written.
Once those prompts finally worked, I built Moon around them. They are still what powers Fills & Drains: the AI pulls the factors out of your own notes, and your own ratings decide which side each one lands on.
What grew out of that:
• Recaps for a day, a week, a month and a year — a story of what happened, what changed, and what stood behind your mood's movements. It looks across your whole history: your rhythms, your best and worst days of the week, and especially the days that break the usual picture. Correlations, not causes.
• Fills & Drains — the recurring factors in your notes: people, places, activities, habits. You see which ones your mood is usually higher with, and which ones lower. No judgments and no advice, just your own data.
• Voice input — dictate an entry out loud and speech recognition turns it into text.
• Widget — log a mood straight from the home screen, without opening the app.
• Charts — day, week, month, year. See where the trend is going, and tap any point to jump back to the entry.
Happy to answer anything — especially about the no-advice rule, which turned out to be the hardest thing to hold on to.
The product is so aesthetically pleasing! If I feel Great in the morning then Meh in the afternoon and evening, will these cancel each other out for the daily recap? I can never figure out what was my entire mood of the day because of this... Congratulations on the launch, excited to try it out. (The built-in Apple Health Mood prompt doesn't work on me even with notifications, so hopefully this helps create a sticky behaviour ^_^)
About Moon on Product Hunt
“AI Mood Tracker. See what fills your mood and what drains it”
Moon was submitted on Product Hunt and earned 14 upvotes and 5 comments, placing #24 on the daily leaderboard. Moon is a mood diary for iPhone — and a mood tracker that never gives you advice. Its whole value is in surfacing the factors behind your mood — so you can, in the end, make it better. No account, no sign-up.
Moon was featured in iOS (110.8k followers), Artificial Intelligence (478.1k followers) and Health (6.9k followers) on Product Hunt. Together, these topics include over 165.4k products, making this a competitive space to launch in.
Who hunted Moon?
Moon was hunted by Alex Vasilevsky. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
Want to see how Moon stacked up against nearby launches in real time? Check out the live launch dashboard for upvote speed charts, proximity comparisons, and more analytics.
Alex Vasilevsky
Hi Product Hunt 👋
I needed this AI diary for myself.
It started with prompts, not with an app. For more than six months I was writing, debugging and testing prompts that could get an AI to read my own entries and find the patterns in them — what fills my mood and what drains it. Most of that time went into the debugging and the testing: getting the model to stop inventing, to stop handing out advice, and to stay with what I had actually written.
Once those prompts finally worked, I built Moon around them. They are still what powers Fills & Drains: the AI pulls the factors out of your own notes, and your own ratings decide which side each one lands on.
What grew out of that:
• Recaps for a day, a week, a month and a year — a story of what happened, what changed, and what stood behind your mood's movements. It looks across your whole history: your rhythms, your best and worst days of the week, and especially the days that break the usual picture. Correlations, not causes.
• Fills & Drains — the recurring factors in your notes: people, places, activities, habits. You see which ones your mood is usually higher with, and which ones lower. No judgments and no advice, just your own data.
• Voice input — dictate an entry out loud and speech recognition turns it into text.
• Widget — log a mood straight from the home screen, without opening the app.
• Charts — day, week, month, year. See where the trend is going, and tap any point to jump back to the entry.
Happy to answer anything — especially about the no-advice rule, which turned out to be the hardest thing to hold on to.