Rivet & Rune
PRODUCTS ABOUT NOTES SUPPORT

Capture what you did, and why.
Recall it when it matters.

The work log your AI can read.

CogniLog is a native Mac, iPhone and iPad work log for anything worth remembering. It captures the story between your commits, meetings, and deliverables: the decisions, the dead ends, and the reasoning. A built-in MCP server means your AI assistant can read it, and write to it.

Download on the App Store See how it works

For Mac, iPhone and iPad. Want the newest features first? Email me for a TestFlight invite.

The CogniLog composer. A Markdown entry titled Pull Request Review Jamboree, formatted live. The CogniLog composer. A Markdown entry titled Pull Request Review Jamboree, formatted live. Capture
The Almanac year view. Twelve months of days, colored by channel. The Almanac year view. Twelve months of days, colored by channel. The Almanac month view. Each day shows its entries, colored by channel. The Almanac month view. Each day shows its entries, colored by channel. The Almanac week view. A week of entries laid out day by day, one expanded. The Almanac week view. A week of entries laid out day by day, one expanded. Scan and recall
Hovering a day in the year view. A rollup lists that day's entries by channel. Hovering a day in the year view. A rollup lists that day's entries by channel. Hovering an entry in the week view. A popover previews the entry. Hovering an entry in the week view. A popover previews the entry. Drill in for summaries
CAPTURE

Write the way you already write

Entries are plain Markdown, and they format live while you type: headings become headings, code fences become code. Drop a #tag inline and CogniLog files it for you, and channels keep each context separate.

The CogniLog composer formatting an entry live as it is typed: a channel picker and formatting bar up top, then a heading, bold text, and bullets. The CogniLog composer formatting an entry live as it is typed: a channel picker and formatting bar up top, then a heading, bold text, and bullets.

One feed of everything you’ve logged

Every entry lands in the Stream, grouped by day, with channels and tags in the sidebar. A timeline along the edge shows your whole history in miniature. Scrub it to move across months, or hover a cluster to preview that day.

The CogniLog Stream. Entries grouped by day, channels and tags in the sidebar, and a timeline scrubber along the right edge. The CogniLog Stream. Entries grouped by day, channels and tags in the sidebar, and a timeline scrubber along the right edge.
RECALL · THE ALMANAC

A map of everything you’ve logged, from the over-all view to the play by play

The Almanac turns your log into a map. Scan whole months, hover a day for a rollup of what happened, and drill from the year down to a single entry. The week view lays the days out side by side, which helps for standup or catching up after time away.

The Almanac month view. Each day shows its entries colored by channel, and a hover rollup expands one day. The Almanac month view. Each day shows its entries colored by channel, and a hover rollup expands one day. The Almanac week view. A week of entries laid out day by day, one expanded to its full text. The Almanac week view. A week of entries laid out day by day, one expanded to its full text.
A BUILT-IN MCP SERVER · BRING YOUR OWN AI

Your AI assistant reads and writes to the same log

When your AI session ends, the context goes with it, and the thread is easy to lose. CogniLog ships with a built-in MCP server, so the assistant you already use can both read your history and write to it. Ask it what happened last week, and it answers from your log. Set it to work, and it records what it did, in the same place you record what you did. Capture by hand or by prompt: it all lands in one timeline your assistant can search, cite, and reason across.

CAPTURE · BY HAND OR BY PROMPT
The CogniLog composer with an entry titled Orders table: partition cutover done, formatting tags and a Python code block live while it is typed. MANUAL
An AI agent in a terminal checking the last ETL run, then logging the results to CogniLog on its own. WITH AI
Write it, or ask AI to log it.
READ OVER
MCP →
RECALL · BROWSE OR ASK
The CogniLog Stream showing both entries in one timeline, grouped by day with channel and tags. STREAM
An AI agent in a terminal answering catch me up on the meridian db work with a summary built from CogniLog entries. ASK
Scroll the timeline, or just ask.

AI prompts shown run in your own agent, here a terminal, over CogniLog’s built-in MCP server, not inside the app.

The gap between reasoning and recollection

Finished work gets archived to make room for the next thing. What comes back later is an index of what happened, not the why. Most tools are good at capture or good at recall, rarely both in one place. CogniLog exists to close that gap.

Read the whole story

Built for Mac, iPhone and iPad

Log from your desktop while you and your agents work, or capture a thought on the go from your iPhone or iPad. Entries sync between your devices through your own iCloud, whoever wrote them. Capture from the menu bar, the share sheet, Shortcuts, Siri or your lock screen.

Menu bar Share sheet Siri & Shortcuts Widgets iCloud sync
CogniLog on iPhone. The Stream with entries grouped by day. CogniLog on iPhone. The Stream with entries grouped by day.
The Almanac on iPhone. Months as a grid of days, colored by channel. The Almanac on iPhone. Months as a grid of days, colored by channel.

The same composer on your phone

The iPhone composer formats as you type, the same as on the desktop, with a formatting bar above the keyboard. An entry you tap out on your phone reads like one you wrote at your desk.

The iPhone composer. A formatted entry about planting a tomato bed, tags at the top, formatting bar above the keyboard. The iPhone composer. A formatted entry about planting a tomato bed, tags at the top, formatting bar above the keyboard.

CogniLog on iPad, in one window or several

On a large screen, CogniLog uses the Mac’s layout: channels and tags on the left, your log beside them, and the Almanac with room for a whole year. Open more windows and each one keeps its own view, filter and scroll position.

Four CogniLog windows on one iPad: the log filtered to one channel, the Almanac month, a draft being written, and the Almanac year. Four CogniLog windows on one iPad: the log filtered to one channel, the Almanac month, a draft being written, and the Almanac year.
Your log, the month, a draft and the year, each in a window of its own.

Each window size gets its own layout

Make a window any size and the layout follows. This is the same log at four sizes, drawn to scale.

CogniLog full screen on iPad. Channels and tags in a sidebar, the log beside them, and a timeline along the right edge. CogniLog full screen on iPad. Channels and tags in a sidebar, the log beside them, and a timeline along the right edge.
Full screen
The Mac’s layout. Channels and tags stay pinned on the left, and a timeline runs down the edge.
CogniLog in a tall window on iPad. The log fills the window, with no sidebar. CogniLog in a tall window on iPad. The log fills the window, with no sidebar.
Tall window
Your log takes the whole window. Channels and tags slide in when you want them, and you can still write beside it.
CogniLog in a smaller window on iPad, showing a single pane of the log. CogniLog in a smaller window on iPad, showing a single pane of the log.
Smaller window
One pane at a time. New entries open over your log.
CogniLog in a phone-width window on iPad, with the single column and back button of the iPhone app. CogniLog in a phone-width window on iPad, with the single column and back button of the iPhone app.
Phone width
The same single column you get on iPhone.
The Almanac month view on iPad, with channels and tags pinned in a sidebar. The Almanac month view on iPad, with channels and tags pinned in a sidebar.
The month, with your channels and tags pinned beside it.
Writing a formatted entry in a pane beside the log on iPad, with the keyboard up. Writing a formatted entry in a pane beside the log on iPad, with the keyboard up.
Write in a pane next to your log, or in a window of its own.

A keyboard and trackpad are optional. With them you get the menu bar, keyboard shortcuts and hover previews. Your iPad uses the same log as your iPhone and Mac, synced through your iCloud. iPad support arrived in CogniLog 1.4.

Markdown in, Markdown out

Bring your notes in from the apps you already use, and take everything back out as plain Markdown.

IMPORT
Start with your history

Notes from Apple Notes, Day One, Obsidian and Bear import directly, and a CogniLog backup restores the same way.

EXPORT
Take it anywhere

Your entries export as plain Markdown, so anything that reads Markdown can pick up where CogniLog leaves off. The whole log also exports as a portable backup that imports right back in.

Your log lives on your devices and in your iCloud

There’s no account to create, and no servers of mine hold your log. The MCP server runs on your Mac, and only when your AI tool starts it.

Shortcuts

CogniLog 1.3 adds actions for Siri and the Shortcuts app. These shortcuts are built on them. Open one on your iPhone, iPad or Mac to add it to Shortcuts, then change it however you like.

Summarize my week

Sends the last seven days of your log to Apple Intelligence and shows you a summary.

Standup notes

Turns yesterday’s entries into what got done, what’s next and what’s blocked, and copies it to your clipboard.

End-of-day wrap-up

Summarizes today’s entries and saves the summary back to your log, tagged summary.

Dictate a log entry

Say what you did, and it’s logged.

Summarize my week, Standup notes and End-of-day wrap-up need a device that supports Apple Intelligence. All of them need CogniLog 1.3 or later.

In the works

FIXING TO SHIP
Calendar ingestion
Your meetings and events, alongside what you actually did.
FIXING TO SHIP
GitHub import
Pull commits, PRs, and review comments straight into the log.
NEXT
Apple Watch
Log a quick note from your wrist, and it shows up in your log on iPhone, iPad and Mac.
PLANNED
On-device AI
Auto-titles and roll-ups with Apple’s on-device models. Nothing leaves your Mac.

CogniLog is currently free

Everything in the app is free right now. Some future features will be paid upgrades.

Get CogniLog

It’s on the App Store now, for Mac, iPhone and iPad.

Download on the App Store

Want occasional updates? Leave your email and I’ll write when there’s a new release or a new beta.

The TestFlight beta is by invitation. Email support@rivetrune.com to ask for one.

Also from Rivet & Rune: Dice Builder, a dice roller made to sit on the table with you.