Obsidian vs Todoist

Obsidian

Local-first knowledge base on plain Markdown files

Obsidian is a note-taking and knowledge management app that stores notes as plain Markdown files on your own device. Users write and link notes together to build a personal knowledge base - sometimes called a second brain - that can be explored through links, backlinks and a visual graph of connections. Its local-first design is the defining choice. Notes are ordinary text files in a folder you control, not records in a company's database, so they remain readable with any editor, work offline, and are not locked into a proprietary format. That gives users confidence that years of notes will outlast the app itself, and it appeals strongly to privacy-conscious people, researchers, writers and developers. The linking model encourages networked thinking. Typing double brackets creates a link to another note, backlinks show every note that references the current one, and the graph view visualises how ideas connect. Canvas provides an infinite board for arranging notes and media spatially, and properties, tags and powerful search help organise large vaults. Extensibility is a major strength. A very large community has built plugins and themes that add task management, spaced repetition, calendars, databases, kanban boards, integrations and much more, so Obsidian can be shaped into almost any workflow. The core app is free to use, and the company earns revenue from optional paid services: Obsidian Sync for encrypted syncing across devices and Obsidian Publish for turning notes into a website. The trade-offs follow from the flexibility. A blank vault and endless plugins can lead to time spent configuring rather than writing, real-time collaboration is limited compared with cloud tools, and syncing without the paid service requires setting up an alternative. Alternatives include Notion for collaborative docs and databases in the cloud; Logseq, an open-source outliner with local files; Roam Research, which popularised bidirectional linking; Bear and Apple Notes for simple writing; Evernote for traditional note capture; and Capacities and Tana for object-based knowledge management. Choose Obsidian when you want a personal knowledge base you fully own and can customise without limits.

Todoist

Task manager that captures everything in natural language

Todoist is a personal and team task manager built around fast natural-language capture: typing "review the pitch deck every Monday at 9am" creates a recurring task with the right date, recurrence, and priority, without ever opening a form. That capture speed, via a feature Todoist calls Smart Quick Add, is the reason people stay with it for a decade. The cost of writing something down is close to zero, which is the property that determines whether a task system is actually used. Everything else, including the projects, labels, filters, and views, is organisation applied after the fact rather than a tax paid at entry. The free Beginner plan covers 5 personal projects, Smart Quick Add, task reminders, flexible list and board layouts, 3 filter views, 1 week of activity history, plus email and calendar integrations and access to Ramble. For a single person tracking their own work, that is often the whole product. Pro raises the ceiling substantially: 300 personal projects, calendar layout, task duration, custom task reminders, 150 filter views, full reporting history, Task Assist, and unlimited Ramble. The jump from 3 filter views to 150 is the meaningful one for anyone who runs a review-based system, because saved filters are how you build a weekly review that assembles itself. Business adds everything in Pro for every member plus a shared team workspace, up to 500 team projects, team activity logs, shared templates, up to 1,000 team members and guests, team project folders, and team roles and permissions. Pro and Business are sold per user per month, plus local tax. The current per-seat figures are rendered client-side on todoist.com/pricing and could not be verified at the time of writing, so check the pricing page directly rather than relying on a quoted number here. Who it is for: individuals who want a reliable personal system, and small teams who want shared lists without adopting a full project management platform. It is deliberately not a replacement for a tool that tracks sprints, dependencies, and resource allocation. How it compares: Things 3 is more elegant and a one-time purchase, but Apple-only. TickTick bundles a calendar, habit tracking, and a Pomodoro timer into a similar price point and is the closest feature-for-feature rival. Microsoft To Do is free and adequate if you already live in Microsoft 365. Notion and ClickUp can both model tasks but are slower to capture into, which is precisely the tradeoff Todoist refuses to make. Asana and Linear are team project tools that outclass Todoist on structured delivery work and are heavier than any individual needs. Todoist's advantage is capture speed, cross-platform reliability, and a free tier you can live in; its limit is that it manages tasks rather than projects. Pick it if the problem is remembering commitments rather than coordinating a team.