VisiGrab vs Lagz
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
VisiGrab
This app offers an interactive, visual guide to mastering algorithms and data structures. It transforms complex concepts into intuitive experiences with dynamic visualizations and step-by-step explanations. Prepare for technical interviews and enhance your coding skills with comprehensive coverage and code examples.
- Interactive visualizations
- Step-by-step algorithm unfolding
- Comprehensive DSA coverage
- Code examples in Python and Java
- Gamified learning
- Offline access
- Lifetime access
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VisiGrab is your interactive DSA visualizer — the easiest way to master Python coding, Java, and C++ programming through step-by-step visual animations. Whether you're a computer science student preparing for a code study exam, a self-taught developer getting ready for tech interviews, or an experienced programmer brushing up on data structures, VisiGrab makes learning intuitive and engaging. Why VisiGrab? The true value of VisiGrab isn’t just the content itself—which you can find online for free—but the way you experience and process it. Studying data structures from raw sources often feels like wandering blindly through a dark cave. VisiGrab acts as your guide, taking you by the hand and leading you smoothly along the winding paths into the light. It is also the ultimate tool to overcome imposter syndrome. Many talented programmers feel like frauds simply because they lack a formal background in algorithms. VisiGrab cures this anxiety by making core computer science concepts so intuitive that they finally click. As a student or developer, you have a choice: waste weeks digging through tons of unstructured tutorials, or build a rock-solid computer science foundation in just a few days. Time is your most valuable resource, and this study app is designed to save it. By delivering content in an adapted, step-by-step sequence, VisiGrab builds a cohesive mental map in your mind, transforming you into a confident engineer. Comprehensive DSA Coverage Data Structures: • Array, Linked List, Doubly Linked List • Stack, Queue • Min-Heap • Hash Table (chaining & open addressing techniques) • Binary Search Tree (BST) & Trie • AVL Tree & Red-Black Tree • B-Tree • Graph & Graph Constructor (build your own graphs) Sorting & Operations: • Bubble, Selection, Insertion, Merge, Heap, Quick Sort • Pre-order, In-order, Post-order, and Breadth-first traversal (BFS) • Inserting and deleting nodes in BST, AVL, and Red-Black Trees • Depth-first search (DFS) & Dijkstra's algorithm (shortest path) • Bellman-Ford, Prim's, and Kruskal's Minimum Spanning Tree • Topological Sort & Union-Find Code Examples in Java, Python, and C++ Every visual DSA animation is accompanied by its implementation code in Java app format, Python coding, and C++. See the direct link between the code and the visual animation — understand not just what the concept does, but how the program makes it happen. Full source code available on GitHub. Available in 10 Languages VisiGrab supports English, German, French, Spanish, Portuguese, Polish, Ukrainian, Japanese, Korean, and Chinese (Simplified) — making it accessible to CS students worldwide. Perfect for Coding Interview Preparation Preparing for your next technical interview at a top tech company? VisiGrab helps you visualize and understand the DSA topics most commonly asked in coding interviews. Build a strong foundation in data structures and go into your interview with confidence. Ideal for LeetCode practice, competitive programming preparation, and CS exam study. Gamified Learning Experience VisiGrab features a gaming-inspired design that makes studying coding fun and motivating. Interactive controls let you step through each node at your own pace, manipulate data in real-time, and see results instantly. Key Features • Interactive visual animations for every binary tree, graph, and structure • Step-by-step execution — pause, rewind, and control the pace • Code view with Java, Python, and C++ implementations • Offline access — study app anywhere, no internet required • Gamified interface that keeps you engaged • One-time purchase — no subscriptions, no ads, no recurring fees Learn DSA Anytime, Anywhere Whether you're commuting, waiting between classes, or studying at home, VisiGrab turns your phone into a powerful code learning study app. No internet connection needed — your complete DSA course is always available offline. Download VisiGrab today and start mastering data structures visually!
Lagz
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Lagz macht die Schallgeschwindigkeit im Physikunterricht messbar – mit nichts weiter als einem Luftballon, einem iPad und ein paar Metern Abstand. SO FUNKTIONIERT DAS EXPERIMENT Eine Person lässt in 15 bis 20 Metern Entfernung einen aufgeblasenen Luftballon platzen, eine zweite filmt den Moment mit dem iPad in Zeitlupe (bis zu 240 Bilder pro Sekunde). Das Licht erreicht die Kamera praktisch verzögerungsfrei, der Knall dagegen messbar später. Genau diese Differenz wird in Lagz sichtbar: Die Schüler:innen markieren zwei Zeitpunkte – t1, wenn der Ballon im Bild zerplatzt, und t2, wenn der Knall in der Tonspur ankommt. Aus der bekannten Entfernung und der Zeitdifferenz ergibt sich die Schallgeschwindigkeit. FUNKTIONEN • Videoaufnahme in Zeitlupe direkt in der App oder Import aus der Fotomediathek • Bildgenaues Scrubbing durch das Video, Pinch-to-Zoom für den entscheidenden Moment • Wellenformdarstellung der Tonspur mit frei ziehbaren Markern für t1 und t2 • Audio-Scrubbing: Der Knall ist beim Ziehen des Markers direkt hörbar • Video zuschneiden, um sich auf den relevanten Ausschnitt zu beschränken • Vergleich mit dem theoretischen Wert in Abhängigkeit von der Lufttemperatur • Messungen werden lokal auf dem Gerät gespeichert DAS RECHNEN BLEIBT SCHÜLERSACHE t1 und t2 werden groß angezeigt – die Formel v = s / Δt liegt bewusst hinter einem eigenen Button samt Schritt-für-Schritt-Anleitung. So führen die Schüler:innen die Rechnung zuerst selbst von Hand durch und prüfen ihr Ergebnis erst danach in der App. FÜR DEN UNTERRICHT GEMACHT Lagz richtet sich an Lehrkräfte und Schüler:innen der Sekundarstufe I und II im Themenfeld Akustik und Wellenlehre. Die App eignet sich für Einzel- und Gruppenarbeit, im Klassenzimmer ebenso wie auf dem Schulhof. DATENSCHUTZ Lagz erfasst keine Daten. Videos und Messwerte bleiben ausschließlich auf dem Gerät. Kamera und Mikrofon werden allein für die Aufnahme des Experiments verwendet.
Screenshots
Verdict
The clearest difference is in-app purchases: Lagz at none against VisiGrab's 1. Lagz also leads on update cadence (every 8 days vs every 3 weeks). VisiGrab's advantage is iOS requirement (15.0 vs 18.5). On price, ads and device support 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. VisiGrab sells 1 one-off in-app purchase. Lagz asks for nothing beyond the download.
VisiGrab ships an update every 3 weeks, Lagz every 8 days. The most recent releases landed on October 6, 2026 and October 7, 2026 respectively.
| Parameter | VisiGrab | Lagz |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (74 ratings) — better | — |
| Positive reviews | 88.2% of reviews | — |
| Number of ratings | 74 — better | — |
| Update frequency | Every 3 weeks | Every 8 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 18.5 |
| Further details — not scored | ||
| Size | 310 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Ievgen Ovsii | Harald Hochwald |
In-app purchases
VisiGrab
- Lifetime Access — All Content$6.99
Lagz
No in-app purchases









