The mark experiment vs FlashStacks
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
The mark experiment
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Have you ever tried to memorize a part of the Bible, e.g. a complete book? The gospel of Mark has a very intelligent structure that is very easy to memorize. It is the set of headlines like they are printed above a section in the Bible. This structure is basis for e.g. the Mark theatre, where 15 actors play the complete gospel in 90 minutes in a theatre-in-the-round without any stage props. This is very impressive. Anyway, memorizing the gospel is a very good idea for studying the Bible without the physical book. This app is meant to be a training to people who already learned the structure (partially) anyway, as a smartphone is much quicker in use than a non-interactive piece of paper. It is based on the book published by VTR Publications. The app can walk trough three different levels of the structure: The complete gospel, one of the six parts (or the introduction or conclusion) or a midsection. For every step, four possible answers are shown to select the correct one. Afterwards, an emoji rates the quality and quantity of your recitation. To get a good rating, you need be fast without thinking about all choices.
FlashStacks
Transform study materials into interactive Home Screen widgets. AI generates flashcards from PDFs, and spaced repetition optimizes learning. Visualize concepts with image occlusion and track progress with detailed stats.
- Home and Lock Screen widgets
- AI-powered PDF to flashcard generation
- Spaced repetition learning
- Image occlusion cards
- Progress tracking and stats
- Customizable widget themes
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Your flashcards, on your Home Screen. FlashStacks turns your study cards into beautiful Home Screen and Lock Screen widgets. Glance at a question between classes. Tap to reveal the answer. Move to the next card — all without opening the app. Learning fits into the moments already filling your day. Always visible, always ready Your stacks live as widgets that rotate automatically throughout the day. Every time you check your phone, there's something new to learn. Tap to reveal, tap to advance. AI-powered deck generation Upload any PDF — lecture notes, textbook chapters, study guides — and AI instantly creates a complete flashcard deck. Choose high-yield mode for exam prep or comprehensive for full coverage. Every card is widget-ready from the start. Spaced repetition that works FlashStacks uses the same proven science behind Anki. Cards you struggle with come back sooner. Cards you've mastered fade into the background. Study smarter, not longer. Image occlusion cards Add any image — diagrams, anatomy, maps — and draw boxes over areas to hide. Tap to reveal what's underneath. Perfect for visual subjects. Beautiful by design Every stack gets its own colour palette — soft pastels or bold modern tones. Widgets match your stack's colours. Dark mode uses pure OLED black. Track your progress Per-stack stats show mastery level, difficulty breakdown, and 14-day activity. Build a streak. Hit your daily goal. FlashStacks Premium Create unlimited stacks, generate decks from PDF with AI, add image occlusion cards, and study from your Lock Screen. Monthly and annual plans available. 3-day free trial included with annual. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: The mark experiment at none against FlashStacks's 2. The mark experiment also leads on device support (3 vs 1) and iOS requirement (9.2 vs 17.6). FlashStacks's advantage is update cadence (every 5 days vs every 31 months). On price and ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. FlashStacks sells 2 in-app purchases, starting at $4.99 per month. The mark experiment asks for nothing beyond the download.
The mark experiment ships an update every 31 months, FlashStacks every 5 days. The most recent releases landed on September 8, 2026 and September 9, 2026 respectively.
| Parameter | The mark experiment | FlashStacks |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.5 (6 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 6 — better |
| Update frequency | Every 31 months | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Freemium |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 9.2 — better | 17.6 |
| Further details — not scored | ||
| Size | 14 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Jonas Kellert | Bailey Skewes |
In-app purchases
The mark experiment
No in-app purchases
FlashStacks
- FlashStacks Premium — Monthly$4.991 Month
- FlashStacks Premium — Annual3 Days trial$34.991 Year
Questions
Is The mark experiment free?
Is FlashStacks free?
Do The mark experiment or FlashStacks have ads?
Which is updated more often, The mark experiment or FlashStacks?
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