What is Monocle used for?

Monocle is a free, MIT-licensed personal search engine built from scratch in the Ink programming language, indexing one developer's blog posts, journals, notes and tweets for fast recall. It is a good fit for personal archive and note recall search, and studying how to build a full-text search engine.

Is Monocle open source?

Yes. Monocle is open source under the MIT licence. Its source code is on GitHub at thesephist/monocle and is written mainly in JavaScript.

Yes. Monocle is open source, so the software itself is free to use.

Can I self-host Monocle?

Yes. Monocle can be self-hosted on your own server or infrastructure.

What are some alternatives to Monocle?

Similar open-source tools in the Search category include Meilisearch, Typesense and ZincSearch. SaaS products in the same category include Baidu, Bing and Brave Search.

Is Monocle actively maintained?

The most recent commit to Monocle was on 6 November 2022. The project has 1.5k stars on GitHub.

Monocle: open-source search

About Monocle

Monocle is a personal, universal search engine built by its creator to search across their own blog posts, journal entries, notes, tweets, contacts and more, effectively acting as an extended personal memory. It was built specifically around the particulars of its creator's own data and workflow, so it is explicitly not designed to work out of the box for other people's data.

The entire system, including the ingest and indexing pipeline, the web server, and the client web app, is written in the Ink programming language, with the client interface built using the Torus UI library the same author created. The project implements its own full-text search algorithm from scratch, which the author describes as a learning exercise in how such systems work rather than an attempt at cutting-edge search quality, prioritizing fast time-to-first-result and effective recall over sophistication.

Monocle is released under the MIT license, and a public demo is available indexing a subset of the author's own data. Because it is tightly coupled to one person's personal data pipeline, it is best understood as a case study in building a personal search tool rather than software meant for general reuse.

Key features

Full-text search built from scratch in Ink
Indexes blog posts, journals, notes and tweets
Fast time-to-first-result design
Custom web server and client UI
Public demo on a subset of real data

Good fit for

→Personal archive and note recall search
→Studying how to build a full-text search engine

Built with: JavaScript
Tags: search-engine; full-text-search; personal-knowledge-management; ink-language; self-hosted

Monocle: questions and answers

What is Monocle used for?: Monocle is a free, MIT-licensed personal search engine built from scratch in the Ink programming language, indexing one developer's blog posts, journals, notes and tweets for fast recall. It is a good fit for personal archive and note recall search, and studying how to build a full-text search engine.
Is Monocle open source?: Yes. Monocle is open source under the MIT licence. Its source code is on GitHub at thesephist/monocle and is written mainly in JavaScript.
Is Monocle free?: Yes. Monocle is open source, so the software itself is free to use.
Can I self-host Monocle?: Yes. Monocle can be self-hosted on your own server or infrastructure.
What are some alternatives to Monocle?: Similar open-source tools in the Search category include Meilisearch, Typesense and ZincSearch. SaaS products in the same category include Baidu, Bing and Brave Search.
Is Monocle actively maintained?: The most recent commit to Monocle was on 6 November 2022. The project has 1.5k stars on GitHub.