Finding a notes app for AI agents sounds like a gimmick until you watch one actually work. Gravity Notes is a $9.99 pay-once notes app from an independent developer in Germany that ships a command-line tool for your Mac, so Claude Code, Codex or a plain cron job can search, add and edit your notes. My verdict up front: the note-taking itself is excellent — one of the fastest capture flows I have seen on any platform — but you should buy it for the capture, not the agent gimmick. The CLI is a genuinely useful extra, not the whole product, and the honest limitations (Apple-only sync, deliberate lack of folders) matter more than the marketing. This review covers what it does, the verified pricing, who it suits, the watch-outs, and how it stacks up against the usual suspects.
What Gravity Notes actually does
Gravity started from a public note by Andrej Karpathy about keeping one long note: add new things at the top, and every so often scroll down and move whatever still matters back up. The developer, Tristan, tried every personal-knowledge-management method he could find and concluded that copying and pasting to “bump” entries was tedious. Gravity is his automation of the idea: every entry becomes its own note in a single chronological list.
The interaction model is three moves:
- Append: type anything at the top of one stream and press Return twice. There is nothing to file, tag or name. The note is saved.
- Review: scroll from newest to oldest now and then. Older notes sink as new ones arrive; you look for whatever still catches your eye.
- Rescue: swipe right on anything that still matters and it goes straight back to the top. Everything else keeps sinking.
The editor formats Markdown as you type, so a line starting with - [ ] becomes a checklist you can tick straight from the list. Notes stay on your device with optional iCloud sync between iPhone, iPad and Mac, and everything exports as Markdown or plain text. On Android, the app backs up to a folder of your choice every day. The deliberate design stance is worth stating plainly: no folders, no tags, no account. The developer has said publicly that if a feature slows down capture, it does not go in.
Why a notes app for AI agents needs a command line, not a chat window
This is the part that separates Gravity from every other minimalist notes app. The Mac version ships a gravity command-line interface, and Claude Code, Codex or a cron job can use it to search your notes, add new ones and edit existing ones. Output can come back as JSON, which is exactly the shape agents like, and there is a --dry-run flag that shows you what would change before anything destructive runs.
The origin story is honest in a way launch copy rarely is: the developer built the CLI for his own use, because he wanted to write something down and have his OpenClaw agent ask him about it days later. Changes made from the Mac reach your iPhone through iCloud sync. Concretely, the patterns that make sense here are small and boring in the best way: a cron job that files a daily standup summary into your notes, an agent that searches your notes for context before answering a question about your projects, or a script that appends build results so you can scroll them later on your phone.
The key detail to understand: the CLI is Mac-only. There is no Windows or Linux client in the picture, and the agent features piggyback on the Mac app’s storage. If your agent workflow lives on a Linux server, this is not your bridge. If it lives on your Mac, the integration is about as frictionless as this category gets.
Pricing: $9.99 once per platform, no subscription
Gravity costs $9.99 per platform as a one-time purchase: once on the App Store for iPhone, iPad and Mac, and once on Google Play for Android. There is no subscription tier, no pro upsell inside the app, and no account to manage. Per the developer’s launch post, the Mac app launched on Product Hunt in February 2026 and he has since shipped more than 30 releases across iPhone, Android, Mac and the command line.
That release cadence matters for the trust calculation. A solo developer is a bus-factor risk by definition, but 30+ releases in eight months is the strongest counter-signal available: it is someone who maintains what they ship. The one-time pricing also changes the economics of trying it. You are not signing up for another $8-a-month note app that you forget to cancel; you pay once and the app is yours.
Worth knowing before you buy on Android: the per-platform price applies there too, and (as covered below) the Android side does not yet get the same sync story as Apple devices. Check the official Gravity site for the current store listings before purchasing.
Who it is for (and who should skip it)
Gravity fits a specific kind of person, and the App Store reviews describe them well: people who capture constantly and organise never. Founders who jot ideas between meetings, developers who dump terminal output and todos into one place, and anyone who has tried Notion or Obsidian and bounced off the setup. Multiple reviewers describe it as ADHD-friendly precisely because there is nothing to file — the friction between having a thought and having it saved is about two seconds.
It also fits Mac-based developers and solo builders who are experimenting with AI agents and want a human-readable, machine-writable memory layer without standing up a database. A stream of notes that both you and your agents can read and write is a legitimate lightweight pattern, and Gravity is currently one of the few consumer apps that ships it.
Who should skip it: anyone whose notes are a reference library. If you maintain research archives, project wikis or anything you need to browse by category, the single-stream model will fight you. People who live on Windows or Linux get only the Android/iOS apps, not the CLI that makes the agent angle work. And if you are on Android as your primary device, read the sync section below before paying.
Watch-outs and honest limitations
The limitations are mostly the philosophy, stated plainly:
- Sync is Apple-first. iCloud sync covers iPhone, iPad and Mac. Android gets a daily backup to a folder you choose, which is a safety net, not sync — cross-device continuity on Android is on a beta waiting list. If your phone is Android and your laptop is a Mac, your notes will not flow the way the marketing implies.
- There is a ceiling on organisation. No folders, no tags, no attachments, no web clipper. For capture-first use this is the point; for anything archival it becomes the reason to leave.
- The agent access is write access. A CLI that can edit your notes is a CLI that can damage your notes. The
--dry-runflag exists for a reason — use it while you are scripting, and keep the Markdown export as your backup. Think of agent write access the way you would think of giving any tool delete permissions. - Solo-developer risk. One person in Germany maintains the whole thing. The release history is reassuring, but there is no company behind it if he moves on.
- Search is keyword search. Old notes sink out of view and search still finds them, which works until your stream holds thousands of entries and you cannot remember the word you used. Rescue-as-curation helps only if you actually review.
How it compares to the alternatives
Apple Notes and Google Keep are free, sync everywhere, and do 90% of what most people need. Neither offers anything like a scriptable agent interface, and both bury notes in folders. If you want zero cost and zero learning curve, Gravity cannot beat free — it beats them on capture speed and agent access only.
Obsidian is the opposite bet: free for personal use, infinitely extensible, local-first, and capable of everything Gravity refuses to do. The trade is the setup tax. Obsidian rewards people who enjoy building a system; Gravity is for people who have tried that and gone back to a text file. You can bridge Obsidian to agents yourself with plugins and scripts, but you will be maintaining that bridge.
Tot is the closest spiritual sibling — a tiny minimalist Mac/iOS scratchpad from the Iconfactory. Reviewers mention replacing Tot with Gravity. Tot is cheaper and even simpler, but it has no Android app, no export story worth mentioning, and no agent interface. If your world is Apple-only and you want the smallest possible surface, Tot still wins; if agents or Android matter, Gravity pulls ahead.
The honest summary: Gravity is not competing with note-taking suites. It is competing with the Notes app on your phone’s home screen, and its pitch is “the same speed, plus your agents can read it.”
From our experience: giving agents write access to your notes
We build AI automation and agent integrations for clients, so the “agents can edit my notes” pitch gets our attention — and our scepticism. The pattern is genuinely useful: an agent that can append to a trusted note stream is a cheap, durable memory that survives across sessions, and JSON output plus dry-run flags are exactly the interface choices you want to see. This is how we would prototype it for a client before reaching for a vector database.
But the failure mode is also real. We have seen agent pipelines corrupt their own context stores more than once, and a notes app is a context store with sentimental value. Our rule: agents get append access freely, edit access with dry-run review, and never unattended delete access. Gravity’s design supports that posture — use the flags, keep the Markdown export, and treat the stream as a log you curate, not a database you trust. For teams weighing agent infrastructure more broadly, our AI tools directory tracks the agent-native tools we have reviewed, including approval layers that sit between agents and destructive actions.
Frequently asked questions
Is Gravity Notes free?
No. Gravity Notes costs $9.99 as a one-time purchase per platform — once on the App Store (covering iPhone, iPad and Mac) and once on Google Play for Android. There is no subscription and no in-app upsell.
Does Gravity Notes work on Android and Windows?
There is an Android app on Google Play, but note the sync gap: iCloud sync covers Apple devices, while Android currently backs up daily to a folder you choose, with full cross-device sync on a beta waiting list. There is no Windows app, and the agent CLI is Mac-only.
How does the gravity CLI work with Claude Code and Codex?
The Mac app installs a gravity command that agents and scripts can call to search, add and edit notes. It supports --json output for machine-readable results and --dry-run to preview destructive operations. Changes sync to your iPhone through iCloud. The developer originally built it so his own OpenClaw agent could reference notes he had written days earlier.
Can AI agents delete or damage my notes?
Technically, yes — the CLI can edit notes, so a misbehaving script could too. In practice, use --dry-run while developing automations, grant edit access deliberately rather than by default, and keep the Markdown export as a backup. Treat agent access like any other powerful permission.
Is Gravity Notes better than Apple Notes or Obsidian?
It depends on what you value. For pure capture speed plus a scriptable agent interface, Gravity beats both. For free everywhere-sync, Apple Notes wins. For building a personal knowledge base with folders, links and plugins, Obsidian wins by a mile. Buy Gravity for the stream, not as a replacement for an archive.
Gravity Notes is a small, opinionated tool that does one thing — fast capture into a single stream — and happens to ship the best agent interface in its category. At $9.99 once, it is a cheap experiment for Mac-based builders who live in their notes and are starting to live in agents too. Just go in knowing the sync limits on Android and the deliberate ceiling on organisation. If you are evaluating agent tooling for your business and want a second opinion on the architecture, talk to us — this is the kind of integration we build every week.