6,622 tools, each one opened, scored and signed by a Toolio reviewer

Harken

Harken uses spaced repetition to optimize your studying.

Checked 4 Oct 2026 Reviewed by Alex Listed since October 2024

Screenshot of Harken

At a glance

Starts at $4 per month Price as published by the vendor, September 2026.
Free tier No
Platforms Web
Best for Students, professionals, learners
Not for Learners without internet access

3.8 out of 5

Scored by Alex after real use

Our verdict

Harken excels in spaced repetition but is limited by its reliance on this single method. It’s not suitable for those needing a variety of study techniques.

✓What it does well

Spaced RepetitionHarken schedules reviews to optimize long-term memory retention.
Flexible FormatSupports rich text, images, inline code, and code blocks.
Easy AccessAvailable on any device via a responsive web app.

✕Where it falls short

Lacks VarietyDoes not offer diverse study methods beyond spaced repetition.
No Offline SupportCannot be used without an internet connection for reviews.
Limited Import OptionsOnly supports importing Anki decks, not other formats.

Key features

Web ExtensionChromecast extension to quiz yourself on web content.
Stats TrackingTracks and displays your learning progress visually.
Import Anki DecksImports all decks and review history from Anki.
Offline Review SupportAllows reviewing cards without an internet connection.

Questions about Harken

How does Harken help with studying?

Harken uses spaced repetition, scheduling reviews to optimize long-term memory retention. Cards support rich text, images, inline code and code blocks, and stats tracking displays learning progress visually. It runs as a responsive web app available on any device.

How much does Harken cost per month?

Harken starts at $4 per month, according to the price published by the vendor in September 2026. There is no free tier, and the reviewer lists easy access on any device through a responsive web app among its strengths.

Can Harken import Anki decks?

Yes. Harken imports all decks and review history from Anki. The reviewer notes that Anki is the only import format supported, so other formats cannot be brought in. It also offers a web extension for quizzing on web content.

What are the downsides of Harken?

The reviewer says Harken is limited by its reliance on spaced repetition and does not offer diverse study methods, so it is not suitable for anyone needing a variety of study techniques. It also cannot be used for reviews without an internet connection.

What alternatives to Harken does Toolio list?

Toolio lists Flashcard Generator, which generates flashcards from any document or video, along with MESSA for practicing MUN exercises, Tripp for mindfulness and Clipboard TTS for reading text aloud. Harken itself holds a Toolio score of 3.8 out of 5, given by Alex on 4 Oct 2026.

COMPARE