HighMemo

Your memos start on your device.
What you connect is up to you.

HighMemo saves every memo to your device first, shows how your memos relate, and adds AI, Drive sync, and calendar only when you connect them yourself.

No account. No API key. No setup. HighMemo works before you connect anything.

Read the user guide Get HighMemo
HighMemo's memo list on iPhone: a search field reading keyword, #tag, @person, filter chips for All, Pinned, Memos, Links and Documents, and a list of memos each with a title, a summary and a date.

What HighMemo does #

Saving never waits

The memo is on your device the moment you send it, and any tidying happens afterwards in the background. If that tidying fails, nothing you already had is erased. Share a link from any app and it lands as a memo — the title, summary and thumbnail fill in behind you.

How your memos relate

Memos that share a tag gather together, and the tag's name sits at the centre. Link two memos yourself — those links are never removed by an automatic rebuild. Folders, tags and pinning work with no account and no AI.

Organized once you connect an AI

Once an AI provider is connected, every memo you save comes back with a title, a summary, tags and a category.

Your schedule beside your memos

Connect Google Calendar and your schedule sits beside your memos — access is read-only, so HighMemo never creates, edits or deletes an event. Save a memo and HighMemo suggests the events it looks related to; you choose whether to link it. Open an event and choose Add memo to start a memo already attached to it.

Reminders that know when

Put a reminder on a memo — once, daily, weekly or monthly. Or pin a place instead, which is the next section.

Reminder notifications are delivered on iPhone and Android.

Your storage, not ours

Connect a Google account and your phone and Mac see the same memos. They live in your own Google Drive app-data folder — there is no HighMemo server and no HighMemo account, so we cannot look at them. Images and attachments travel too. Sync runs when you open the app and every 5 minutes while it is open, plus a button whenever you want.

Your AI, your key — or no AI at all

You bring the AI. Paste the API key of a service you already pay for and requests go from your device straight to that provider — there is no server of ours in between. Or pick a model that runs on the device itself: download it once and your memo text never leaves the device, with no internet needed. Or connect nothing at all and keep using the app.

Search, and an export you own

Type to filter by title, body or tag; #tag matches that tag exactly. Export everything as one JSON file, with your attached photos embedded in it.

Pin a place, and the memo comes back #

Setting a location reminder on iPhone: a map with a dropped pin and a shaded circle around it, the street address of the pin above the map, a radius row reading 300 m with minus and plus buttons, and a Set Reminder button at the bottom.
Pin a place and the memo comes back when you arrive. Arrival is decided on the device. On iPhone and Android.

Arrival is decided on the device and the notification is created there too — it fires once per visit, not every time you move around inside the same place.

Location reminders are delivered on iPhone and Android. The Mac app notices arrival only while it is open, so it is not something to depend on there.

Dark and light #

Settings → Appearance is the first thing in Settings and it offers three choices: Dark, Light and System — and the choice applies to the whole app rather than to one screen. System follows your device, and it is what you get before you change anything. Your choice is remembered, and the same three are there on iPhone, Android and Mac.

HighMemo's memo list on iPhone in the light theme: a white background with dark text, a search field, filter chips and a list of memo cards.
Light
The same memo list in the dark theme: a near-black background with light text, the same search field, the same filter chips and the same memo cards.
Dark

What it looks like #

The graph view: 54 memos as coloured dots gathered into loose clusters, each dot labelled with the beginning of its memo title, an overview map at the bottom left and a New Memo button at the bottom.
Every memo you have, on one canvas.
A memo open in detail view, showing a title, a folder chip, a reminder set for 2026.08.14 10:00, an AI-written summary card, a checklist body, created and updated dates, a tag chip and a related-memo section.
A memo with an AI-written summary, a tag, a time reminder and a related memo. The summary, tags and category appear once an AI provider is connected.
The calendar view: a month grid for August 2026 with dots on days that have entries, and below it the agenda for Friday, August 14 showing a 10:00 AM entry labelled Tokyo packing list with a Reminder badge.
The calendar puts your reminders — and, if you connect Google Calendar, your events — next to your memos.
The AI Assistant panel answering a Recent trends prompt with a grouped summary of memo themes, a row of preset buttons reading For today, Recent trends and Knowledge gaps, and a note that AI can make mistakes.
The assistant answers from your own memos. It needs an AI provider you connected — cloud, or a model on the device.

The screenshots above are from HighMemo on iPhone, with demonstration memos.

Mention a person or a memo #

Writing a memo on iPhone. The body reads: Flag goes to 50% once the loop lands. Rollback drill is Friday and still has no owner. Loop in @ — and along the bottom of the composer sit three suggestion chips reading Jonas PERSON, Mira PERSON and Priya PERSON.
Type @ while you write and the people you have mentioned before come up.
Another memo being written, ending: Everything else is already written down in @Tokyo. The suggestion row now offers memos rather than people — Tokyo packing list MEMO, Tokyo Trip — Plan MEMO, and a third chip running off the edge of the row.
The same @ finds your own memos — type a name and pick the one you mean.
The memo list with @Mira typed into the search field, a count of 6 at the right-hand end of the field, and below it the six memos that mention her.
Type @ a person's name and every memo they are in comes back.

A memo you mention stays linked even if you delete the mention. A person works the other way round — there the text is the record, so taking the name back out of the body takes the link with it.

On the Mac #

HighMemo on a Mac, editing a memo called On-call handover — Thursday. The middle panel is the editor: a formatting bar, then a heading, a paragraph, two bullets, three checkboxes, and a database query set as inline code — all rendered while the text cursor sits in the paragraph. The graph is on the left and the memo list on the right.
On the Mac, markdown renders as you type — headings, checkboxes and code in the pane you are typing in. Mac only.

HighMemo on Mac is the same app in a window: the memo list, the memo you are reading and the graph can all be on screen at once. It shows no ads. Reminder notifications are not delivered on Mac — the Mac guide is explicit about which platform does what.

The Mac screenshots on this page use the same demonstration memos.

User guides #

Every feature, where to find it, and what it needs before it works. Pick your platform — the three guides differ where the app actually differs.

iPhone & iPad guide Android guide Mac guide

Get HighMemo #

HighMemo runs on iPhone, Android and Mac.

iPhone and Android

HighMemo has not been submitted to the App Store or Google Play yet. This page will carry the store links once it has.

Mac

The Mac download is not published yet

The macOS build exists but its release is still a draft, so there is no file to download and any link here would fail. The buttons below are disabled on purpose rather than pointing at a dead URL.

Both Apple Silicon and Intel Macs are supported. When the download opens, pick Apple Silicon for an M-series Mac and Intel for anything older — Apple menu → About This Mac tells you which you have.

The HighMemo window on a Mac, in three columns: the graph of memos on the left, an open memo called Tokyo — rough shape of the trip in the middle with a summary card, a bulleted body, a mention of @Mira and a row of tag chips, and the memo list on the right with a search field, filter chips and eight memos.
On the Mac the list, the memo you are reading and the canvas are on screen at once.

What to expect the first time you open it

HighMemo for Mac is distributed from this page, not from the Mac App Store. macOS checks apps from outside the App Store the first time you open one, so opening it may take a moment longer than usual. If macOS refuses to open it, go to System Settings → Privacy & Security, scroll to the message about HighMemo, and choose Open Anyway.

The Mac app keeps itself up to date. It checks for a new version when it starts and every few hours after that, downloads one quietly in the background, and puts it in place the next time you quit and reopen. There is no update button and no prompt — you are never interrupted mid-sentence by one.

Windows

There is no Windows build to hand out yet — this button is disabled because the file does not exist, not because a finished download is being held back. It is a different situation from the Mac one above, where the build exists and only its release is unpublished. When there is a Windows build, it will appear here.

Before you install #

Most memo apps decide where your memos live and which AI reads them. HighMemo makes both of those your choice — and works before you choose either.