# Why keyword search fails your journal

> You never wrote the word you are searching for. Semantic search finds the entry anyway — here is how Mento searches your journal by meaning.

Published: 2026-08-17 · Source: https://mentoapp.app/articles/search-your-journal-by-meaning/

---

Here is a test you can run on any journal app you already use. Think of
something that genuinely happened to you, then search for it the way you would
describe it today.

Most people come up empty. Not because the entry is missing — because you did
not write it in the words you are now using to look for it.

## The vocabulary problem

When you write in a journal, you write from *inside* the experience. When you
search for it later, you search from *outside* it, often years later, with
different words.

You search **"burnout"**. What you wrote at the time was that you were tired of
the project and did not want to open your laptop.

You search **"when I met Anna"**. What you wrote was about a loud dinner where
you sat next to someone who had strong opinions about films.

You search **"that cozy evening"**. You have never written the word *cozy* in
your life.

Keyword search compares strings. Your memory does not store strings. That gap is
the whole problem, and it gets worse the more you write — a bigger journal makes
the failure more frustrating, not less, because you *know* the thing is in there.

## Searching by meaning instead

Mento indexes your entries as **embeddings** — numeric representations of what a
passage is *about*, rather than which characters it contains. Two passages that
describe the same kind of experience land near each other, even with zero words
in common.

So the search for "that cozy evening" can surface the night you wrote about the
rain, the slow dinner, and not wanting the conversation to end. No shared
keyword. Same meaning.

This is also why you can ask questions instead of guessing at search terms:

- *"How was I feeling about work in March?"*
- *"What did I say about that trip?"*
- *"Have I written about this before?"*

You do not need to remember what you wrote. You only need to remember roughly
what it was *like* — which is exactly the part human memory holds onto longest.

## The part that matters most: it is built not to make things up

An AI that searches your life has an obvious failure mode, and it is not a small
one. If it finds nothing and answers anyway, it invents a version of your past
that never happened — and you have no way to tell, because you came here
precisely *because* you could not remember.

Mento is designed hard against that. Whether a search actually returned anything
is decided in code, not left to the model to judge: when it comes back empty, the
companion is held to saying so — "I could not find anything about that" — and
often suggests asking a different way, since a memory can be filed under a date
you are not expecting.

It is a smaller-sounding promise than "AI that knows your life." It is the one
that makes the rest trustworthy.

## What this feels like in practice

You stop maintaining your journal like a filing system. No tags to invent, no
folder structure to keep consistent, no discipline about titling entries so
future-you can find them.

You write. Later, you ask.

Mento is on the App Store — your journal becomes searchable from the first entry
you write.