Kinnu is the closest thing to MindShark on the learning-science side: expert-edited "pathways" through general knowledge, adaptive multiple-choice questions, and a spaced-repetition "Memory Shield" — all free, with no ads. It is a serious, well-built product.
The difference is the catalog. Kinnu's pathways are written and edited by people, which makes them good and makes them finite. MindShark generates a Deep Dive on whatever topic you type, so the question is not "does Kinnu have it?" but "what do you want to learn today?"
| Feature | MindShark | Kinnu |
|---|---|---|
| Topic choice | Any topic you name — a Deep Dive is generated on demand | Fixed catalog of expert-edited pathways |
| Session format | 10 Modules of ~5-minute quiz-driven Bites | 5–10 minute pathway tiles |
| Retrieval practice / quizzes | Yes | Yes |
| Adaptive difficulty | Yes | Yes |
| Diagnostic before content | Yes | No |
| Mistake review | Yes | Via Memory Shield review |
| Spaced review | Yes | Yes |
| Final challenge / graduation | Yes | No |
| Streaks and gamification | XP, streaks, leagues | Streaks, knowledge map |
| Audio | No | Yes |
| Ads | None | None |
| Platforms | Web app, installable as a PWA; native iOS/Android planned | iOS, Android, web |
| Best for | Any topic, including niche and professional ones | Free general-knowledge browsing |
| Tier | MindShark | Kinnu |
|---|---|---|
| Free | 1 Deep Dive/day, 2 Bites/day, no ads | Everything, free, no ads |
| Paid | Premium $7.99/mo or $49.99/yr (7-day trial) | Optional $1.99/mo; paid certificates |
Kinnu's core product is free. An optional $1.99/mo subscription and paid certificates ($7.99–$19.99) appear in the App Store; the company also sells separate exam-prep apps.
If Kinnu has a pathway on the thing you want to learn, use it — it is free, it is edited by humans, and its adaptive questions and spaced review are the real thing, not marketing. That is an easy recommendation.
MindShark earns its subscription when Kinnu does not have your topic, which for anything specific, professional, or niche is most of the time. Kinnu's recent focus has also shifted toward exam prep, so new general pathways arrive slowly. MindShark trades editorial polish for coverage: any topic, a diagnostic first, and a final challenge at the end.
Yes. The core app is free with no ads; an optional $1.99/mo subscription and paid certificates exist in the App Store.
For general knowledge, yes — it is free and well designed. Its limit is the catalog: you can only learn what a pathway already covers.
Both quiz you and use spaced review. MindShark generates a Deep Dive on any topic on demand and runs a diagnostic first; Kinnu offers a fixed set of expert-written pathways.
Kinnu is free and tests you; Imprint is prettier and charges $99.99/yr. For retention, Kinnu; for visual explainers, Imprint.