If you had to summarise all of digital minimalism in a single sentence, it would be this: one tool per function. Not two. Not three. One. It seems too simple to be useful, but it’s precisely its simplicity that makes it powerful. Because every time you respect this principle, you eliminate at a stroke the fragmentation, the duplication, the decision fatigue and most of the friction that slows your work.

The Simplest Principle

One tool per function means that for every recurring need in your digital life — taking notes, managing tasks, storing files, communicating — you choose a single tool and channel all related activity through it.

Notes: one place. Tasks: one place. Calendar: one place. Files: one place. No exceptions, no “I use this one for personal and that one for work,” no “this one is for quick notes and that one for long notes.”

The immediate benefit is the elimination of doubt. When you have a single tool for notes, you never ask yourself where to jot something down. When you have a single task manager, you never wonder where to register a task. The decision is already made — before the need even arises. That frees mental energy you can devote to the content rather than spending it on logistics.

The long-term benefit is the accumulation of value. When all your information of a given type is in one place, each new piece benefits from the context of the previous ones. Your notes connect, your tasks have history, your files organise into a coherent structure. With multiple tools, that accumulation is diluted — each fragment sits in a different place and the complete picture doesn’t exist anywhere.

How To Choose The Tool That Stays

The hardest moment in the process is choosing. When you have three tools doing the same thing, one has to stay and two have to go. These criteria help you decide:

Frequency of use. The one you use most already has your data, your habits and your momentum. Moving away from it is the most disruptive change, so it usually makes sense to keep it. Inertia isn’t laziness — it’s accumulated efficiency.

Functional breadth. Between a tool that covers 90% of your needs and one that covers 60%, choose the first. The 10% that’s missing is a minor inconvenience compared to the problems of maintaining two systems.

Reliability and longevity. A tool that’s been on the market for ten years, has a stable team and a clear business model is a safer bet than a freshly funded startup that’s been around for six months. Think long-term: you’re choosing where your information will live for years.

Simplicity of use. Between two options with similar features, choose the simpler one. Not the one with more features, but the one that generates the least friction in daily use. Features you don’t use don’t add — they subtract, because they add complexity to the interface.

Data portability. Can you export your information in a standard format? If the tool you choose shuts down tomorrow, can you recover your data? Avoid tools that trap your information in proprietary formats without export.

Important note: you don’t need the “objectively best” tool. You need the tool that best fits you. Reviews and comparisons are useful as reference, but the final decision depends on your way of working, your priorities and your constraints.

The Commitment That Liberates

Choosing a tool is only half the principle. The other half is committing to it. And commitment is where most people fail.

Committing means:

  • Not constantly evaluating alternatives. When someone mentions a tool you don’t use, you don’t open the website to investigate. You’ve already chosen. Unless your current tool has a serious problem, there’s nothing to evaluate.
  • Investing in learning. Spend time exploring features you don’t know, learning shortcuts, customising the system. Time invested in mastering a tool pays back a hundredfold in future efficiency.
  • Solving problems within the tool. When something doesn’t work as you’d like, the first response isn’t to look for another tool — it’s to figure out how to solve it with what you have. There’s almost always a way.
  • Accepting the limitations. Every tool has shortcomings. Committing means accepting those shortcomings as the price of simplicity. What you lose in functionality you gain in coherence, speed and confidence.

It sounds restrictive, but the effect is paradoxically liberating. When the decision is made, you stop spending energy evaluating options and start spending it producing. The tool shifts from being an object of reflection to being an invisible instrument — exactly as it should be.

Legitimate Exceptions

The one-tool-per-function principle admits few exceptions, but it does admit some:

Imposed separation. If your employer uses a specific tool for internal communication and you can’t use the same one for personal use, the separation is justified. You didn’t choose it — it was imposed.

Fundamentally different functions. Writing an email and writing an article are both “writing,” but the optimal tools for each are different. The rule applies to equivalent functions, not to everything that shares a verb.

Planned transitions. If you’re migrating from one tool to another, you’ll temporarily have two. But it must be temporary — with an end date and a consolidation plan.

What isn’t a legitimate exception: “I use this one for something the other doesn’t do” when that something is a minor feature you could resolve another way. If you need to maintain two tools to cover a single function, probably neither is the right one — and the solution is to find a third that does everything, not to continue with two.

One tool per function. Four words that resolve the majority of the complexity in your digital life. Not because the answer is simple, but because the right question always is.