DNA Viewer vs lemma
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DNA Viewer
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### DNA Viewer - Professional 3D DNA Visualization & Analysis Tool DNA Viewer is an innovative 3D DNA visualization and analysis application designed for molecular biologists, genetics students, and educational institutions. ### Key Features ** Real-time NCBI Data Integration** 1. Real-time integration with NCBI public databases 2. Access to thousands of actual gene sequence data 3. Instant analysis of major genes including APOE, BRCA1, TP53 ** Interactive 3D DNA Visualization** 1. Three 3D models: Double Helix, Ladder, Ball & Stick 2. 360° rotation, zoom in/out, pan functionality 3. Real-time sequence exploration by groups (100bp units) 4. Intuitive touch gesture support ** Professional Analysis Tools** 1. GC content analysis and window plotting 2. Automatic CpG island detection 3. Restriction enzyme site analysis with 3D highlighting 4. Protein translation and codon analysis 5. Open Reading Frame (ORF) detection ** Virtual Cloning Simulation** 1. 22 cloning vectors (pUC19, pET, pcDNA3, etc.) 2. Restriction enzyme selection and cutting simulation 3. Cloning result visualization and sequence generation 4. Export and sharing functionality ** Multi-language Support** 1. Full support for Korean, Japanese, German, and English 2. Localized user interface 3. Accurate translation of scientific terminology ### Target Users ** Researchers** 1. Molecular biology researchers 2. Genetics researchers 3. Biotechnology researchers ** Educators & Students** 1. Undergraduate and graduate students 2. Biology professors and instructors 3. Educational institutions ** Medical Professionals** 1. Genetic counselors 2. Medical researchers 3. Clinical researchers ### Use Cases **Educational** 1. Explain DNA structure in molecular biology classes 2. Gene sequence analysis practice 3. Restriction enzyme experiment simulation **Research** 1. Gene sequence analysis and visualization 2. Restriction enzyme site mapping 3. Protein translation research 4. Cloning experiment design **Presentation** 1. Presentations using 3D DNA models 2. Research result visualization 3. Educational material creation ### Technical Features **Performance Optimization** 1. Efficient processing of large DNA sequences 2. Real-time 3D rendering 3. Optimized memory usage **Data Security** 1. Local data storage 2. No personal information collection 3. Offline basic functionality support Experience complex molecular biology concepts visually with DNA Viewer, and utilize it for your research and education!
lemma
This app provides focused, daily practice for quantitative interviews, featuring timed sprints of math and probability problems. It tracks your skill across disciplines with adaptive difficulty and offers hints and solutions to help you improve. Designed for those preparing for trading firm interviews or seeking to build a quantitative thinking habit.
- Daily timed problem sprints
- Per-category ELO skill tracking
- Adaptive difficulty
- Hints and step-through solutions
- Streaks, XP, and achievements
- Leaderboard
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Train like a quant. Daily. Lemma is the focused, no-fluff prep app for quantitative interviews — built for students and grads targeting Jane Street, Citadel, Optiver, Two Sigma, and the rest of the trading-firm gauntlet. WHAT'S INSIDE WITH YOUR SUBSCRIPTION • Daily sprints — bite-sized timed sets of mental math, probability, combinatorics, expected value, and market-making problems • Per-category ELO — your skill is tracked across 10 disciplines, from Novice to Expert • Adaptive difficulty — problems chosen to keep you at the edge of your level, not above or below • Hints + step-through solutions — get unstuck without giving up • Streaks, XP, leagues — habit loops without the noise • Achievements — unlock as you grind • Leaderboard — see how you stack up WHO IT'S FOR • CS / math undergrads applying to trading firms • Recent grads prepping for technical interviews • Self-learners who want a daily quantitative-thinking habit • Anyone curious about how trading interviews actually feel WHY LEMMA We strip out the gamified clutter and keep what matters: hard problems, fast iteration, real numbers on your progress. The interface borrows more from a Bloomberg terminal than a typical mobile game — monospaced metrics, hairline borders, dark by default. Most prep books drown you in 800 pages. Most courses lock you in for months. Lemma is 10 minutes a day, sharpened every day. — Lemma offers an optional auto-renewable subscription for unlimited daily sprints and premium problem sets. Subscriptions auto-renew unless cancelled at least 24 hours before the end of the current period. Manage or cancel anytime in your Apple ID settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://rogeru13.github.io/lemma-legal/privacy-policy/
Screenshots
Verdict
The clearest difference is price: lemma at Free against DNA Viewer's $4.99. DNA Viewer's advantage is in-app purchases (none vs 3). On update cadence, ads, device support and iOS requirement 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
lemma is free to download; DNA Viewer costs $4.99 up front. lemma sells 3 in-app purchases, starting at $6.99 per 7 days. DNA Viewer asks for nothing beyond the download.
DNA Viewer ships an update every 2 days, lemma every 3 days. The most recent releases landed on September 18, 2026 and September 19, 2026 respectively.
| Parameter | DNA Viewer | lemma |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 2 days — better | Every 3 days |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 4 MB | 31 MB |
| Age rating | 12+ | 12+ |
| Developer | JONG HYUN LEE | Roger You |
In-app purchases
DNA Viewer
No in-app purchases
lemma
- Lemma Premium$6.997 Days
- Lemma Premium$9.991 Month
- Lemma Premium3 Days trial$59.991 Year









