monthletWhat's new in monthlet 1.2.0, and an updated roadmap
monthlet 1.2.0 adds more operations for external agents, including deletion and spreadsheet editing, along with a set of fixes. This post also covers the updated roadmap through early 2027.
Blog
Posts about building monthlet. Written in Japanese first, then translated here.
Token estimates and confirmation before sending
monthlet can estimate how many input tokens a request will use before you send it, and pause for confirmation when the estimate goes over a threshold you set.
Calendar View and Daily Note
How monthlet's calendar view lists your notes by the dates written in them, how times and dated tasks appear, and how the Daily Note works.
Closed beta participants wanted for monthlet AI
monthlet AI lets you use AI by signing in instead of supplying your own API key. We are running an invite-only closed beta from early November through December 31, with up to 15 participants.
What's new in monthlet 1.1.0
monthlet 1.1.0 adds text color and underline, collapsible headings, inline note links, image pasting with search over text in images, Word export, a global capture window, kanban boards, and task due dates.
Running Claude Code in Four Parallel Lanes
How monthlet's development is split into four lanes of Claude Code sessions, with one repository per lane, a single source of truth for each kind of information, and a queue that keeps each lane moving without waiting for approval.
Asking about screenshots and PDFs
How to attach images, PDFs, and text files to a monthlet chat, how PDFs are sent depending on the connected AI, and where attached files end up in your vault.
Feature walkthrough videos are now on the official website
The monthlet website now has a page collecting 21 short videos that show how each feature works, grouped into five topics.
Note components: sliders, status, formulas, and diagrams
An overview of the sliders, status badges, calculation fields, formulas, diagrams, and table of contents you can place in a monthlet note through chat, and how each one looks after the note is exported and opened in a browser.
Folder galleries and pinned tabs
From version 1.0.0, a folder in the sidebar can be opened as a gallery of cards, and tabs can be pinned so they come back the next time you open the app. Image and PDF files can also show thumbnails.
Website updates and upcoming releases
Three new pages on the monthlet website — help, components, and the roadmap — plus how updates will be shipped from here.
Cards and columns in AI-built notes
From 1.0.0, monthlet's AI groups related content into cards and splits side-by-side material into two or three columns when it builds a note. It can also set a small number of visual options such as card fills, spacing, and eyebrow headings.
monthlet 1.0.0 released
monthlet 1.0.0 is out for macOS and Windows. Alongside bug fixes and interface adjustments, the release adds the option to register your own OpenAI-compatible endpoint as the AI connection.
Importing a whole folder of Obsidian notes
monthlet can convert a folder of Obsidian notes in one pass, keeping the folder structure, wiki-style links, images, callouts and frontmatter. The import runs locally and never calls an AI model.
How monthlet tests AI responses (eval)
monthlet writes and edits notes through AI tool calls. This is a look at the scoring harness we added for those calls in August, and more importantly at what it does not measure.
Putting charts inside a note
monthlet renders charts as blocks inside a note. Ask in chat and the chart is placed in the note, optionally linked to a spreadsheet range so it recalculates when the sheet changes.
Editing Notes Together with AI
monthlet lets you write notes through AI chat and then edit them by hand. This article explains the three editing modes that make both kinds of editing possible in a single note.
Deciding how a note looks with themes
monthlet separates a note's structure from its appearance. Blocks carry meaning, and a theme decides how that meaning is displayed — across presets, folders, individual notes, and exported HTML.
Turning frequent instructions into skills
Skills let you save instructions you send to the AI repeatedly and call them up from the chat input with a slash command, including variables for the parts that change.
Managing notes with tags
How tags work in monthlet — adding them by hand or from AI suggestions, filtering notes by tag, renaming or deleting tags in bulk, and how tag colors feed the note map.
One Month After Release and the Road Ahead
A look back at monthlet's first month since the beta release, the numbers behind it, and the product roadmap through 2027.
The architecture of monthlet
How monthlet is built internally — the three layers inside a single note file, the process split in the app, and the options that were ruled out to keep every note a single .html file.
Reusable note templates
Version 0.16.0 ships with two note templates, Meeting notes and Weekly review. Ask in chat, and the AI builds a note on top of the template structure.
Note links and the note map
monthlet lets you link one note to another, and a new note map view draws those links as a graph so you can see how a vault is connected. Available from 0.16.0.
Connecting Google Calendar
From version 0.14.0, monthlet can read and create Google Calendar events. Imported events become notes rather than entries in monthlet's calendar view.
Connecting to Google Sheets
From version 0.12.2, monthlet can read Google Sheets — either by asking about a sheet directly in Chat, or by importing sheets into a monthlet spreadsheet document.
monthlet is now an MCP server - read and write notes from external AI agents
Version 0.13.1 turns monthlet itself into an MCP server, so agents outside the app can read and write the notes in your vault through monthlet rather than touching the files directly.
monthlet now supports MCP — connecting external MCP servers
monthlet can now connect to MCP servers you register yourself, so you decide which external tools the AI in chat can use. This post walks through setup, confirmation prompts, lifecycle, and known limitations.
If You Are Not Sure How Something Works, Ask the AI — How Help Works in monthlet
monthlet ships a built-in help page and lets you ask usage questions directly in the AI chat, which answers from knowledge data bundled with the app. Version 0.12.0 also adds a way to report a chat response that did not work.
Syncing your vault with cloud storage
Because a monthlet vault is a plain folder of HTML files, you can keep it in sync across Macs with the cloud storage you already use. Here is how to set it up and what to watch out for.
Note history, and what comes next
Notes and spreadsheets now keep their earlier states, so you can go back to any of them — plus what is planned after this.
Introducing monthlet, an AI note-taking app
The first post — what monthlet does, why it is being built, and where the name comes from.