Deepstash is a feed of "idea cards": short, quotable takeaways distilled from thousands of non-fiction books and articles, saved into personal stashes. It is designed for a two-minute scroll that leaves you with a line worth remembering.
MindShark is built for the opposite job. You name a topic, it generates a Deep Dive — ten Modules of five-minute Bites — and every Bite ends with a quiz that decides what you see next. Both are short-session apps; only one of them tests whether anything stuck.
| Feature | MindShark | Deepstash |
|---|---|---|
| Topic choice | Any topic you name — a Deep Dive is generated on demand | Fixed editorial catalog of ideas |
| Session format | 10 Modules of ~5-minute quiz-driven Bites | 2–5 minute card swipes |
| Retrieval practice / quizzes | Yes | No |
| Adaptive difficulty | Yes | No |
| Diagnostic before content | Yes | No |
| Mistake review | Yes | No |
| Spaced review | Yes | No |
| Streaks and gamification | XP, streaks, leagues | Streaks and daily goals |
| Saving and collections | Progress per Deep Dive | Stashes and collections (Pro to save) |
| Audio | No | Pro |
| Offline | Installable PWA | Pro |
| Platforms | Web app, installable as a PWA; native iOS/Android planned | iOS, Android, web |
| Best for | Learning a subject properly in five minutes a day | Collecting quotable insights from books |
| Tier | MindShark | Deepstash |
|---|---|---|
| Free | 1 Deep Dive/day, 2 Bites/day, no ads | Free with ads, a daily idea cap, and no saving |
| Paid | Premium $7.99/mo or $49.99/yr (7-day trial) | Pro $12.99/mo |
Deepstash Pro yearly SKUs vary by offer (roughly $30–$100/yr in app stores); the vendor site lists no prices.
If what you want is a better feed than Instagram — a few sharp ideas from a book you will never read in full — Deepstash does that well, and the free tier is enough to find out.
If you want to actually learn something, Deepstash has no mechanism for it. Nothing tests you, nothing adapts, and nothing comes back later. MindShark exists for that gap: the same five-minute window, but each session is a quiz on a course built around your topic, and the misses return until they stop being misses.
Yes, with ads, a daily cap on ideas, and no ability to save. Pro removes the limits and adds audio and offline reading.
No. Deepstash is read-and-swipe only. MindShark ends every Bite with a quiz and uses the results to pick what comes next.
Only if the editorial catalog covers it. MindShark generates a full Deep Dive on any topic you type in.
MindShark Premium is $7.99/mo or $49.99/yr. Deepstash Pro is $12.99/mo, with discounted yearly offers in the app stores.
Deepstash is card-sized and cheaper; Blinkist gives fuller 15-minute summaries with audio. Neither tests retention — if that matters to you, look at MindShark instead.