PepCal vs SpinCube
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PepCal
This ad-free tool assists scientists and researchers with peptide reconstitution and mixing. It provides guidelines for calculating water requirements and exploring mixing ratios for peptide sequences. The app features an intuitive interface, dark mode, and the ability to save favorite calculations.
- Peptide reconstitution calculations
- Mixing ratio exploration
- Bacteriostatic water calculations
- Intuitive user interface
- Dark mode support
- Save favorite calculations
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Pep Cal: Peptide Calculator is an ad-free tool exclusively for scientists, researchers and other enthusiasts providing them with peptide reconstitution and mixing guidelines. The app is not meant for use by medical professionals. Peptide Calculator Features: 1) Reconstitution: Estimate approximately how much water is required for your peptides 2) Mixing Ratios: Explore possible mixing ratios for different sequences 3) Bacteriostatic Water: Use the bacteriostatic water calculations for your mi 4) Easy navigation: Intuitive user interface to navigate easily across the different features 5) Dark mode: Utilize dark mode to access the app at any time as per your convenience 6) Save your favorite calculations 7) Ads free: No ads to enhance your user experience 8) Put decimal numbers in for all values Disclaimer: Peptide Calculator is intended only for educational and laboratory purposes. It is not meant to be used by medical professionals and is not a medical guide or tool. Please consult with your local professional and follow your local regulations and guidelines.
SpinCube
Solve various 3D puzzles with a camera scanner, step-by-step guidance, and a built-in timer. Learn algorithms and track your progress to improve your solving skills. Works offline on your device.
- Camera-based puzzle scanning
- Step-by-step solving guidance
- Integrated speedcubing timer
- Algorithm learning and practice
- Personal best tracking
- Offline functionality
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Five puzzles to twist, one app — and a way out when the real one beats you. FIVE SHAPES, EVERY SIZE A cube, a pyramid, a diamond, a twelve-sided ball and a twenty-sided star — 18 puzzles in all, from 2×2 up to 5×5. (Cubers know them as Pyraminx, Skewb and Megaminx.) Every one of them turns, scrambles and solves for real, in 3D you can spin from any angle. STUCK? POINT YOUR CAMERA Scan the puzzle in your hands, face by face. SpinCube reads the colours and checks they add up. Get one wrong and you fix it with a tap — no starting over. ONE CORNER TWISTED? IT SPOTS THAT Drop it, pop a piece, or let someone twist a corner in place, and the puzzle can never come out again — no matter how well you turn it. SpinCube spots that the moment you finish the scan, instead of letting you go round in circles, and shows you in 3D which way to twist it back. Scan again to confirm the fix. No dismantling, no peeling stickers. THEN FOLLOW IT OUT, ONE MOVE AT A TIME Each step shows you which layer to turn and which way, on a puzzle you can spin while you follow. Go at your own pace, step back when you lose the thread, or sit back and watch the whole solve play out. OR LEARN TO DO IT WITHOUT US The 3×3 comes with the layer-by-layer method — the seven steps most people learn from. Eleven algorithms, each one named, so you can look them up anywhere. Every step opens by telling you what it does and which algorithms it takes; tap any one to watch it run in 3D, then practise it on a cube of your own. The cheat sheet with all eleven is free and yours to keep — the whole point is that one day you won't need the app for this at all. A TIMER WORTH USING Thumbs on both circles, wait for green, let go. The classic speedcubing start, timed to the hundredth of a second. Scan the scramble first and it is saved alongside your time, so you can come back to exactly that mix later. WATCH YOURSELF IMPROVE A personal best for every puzzle, your recent solves as a trend, and a daily streak worth keeping alive. WORKS ON A PLANE Everything runs on your iPhone. No account, no sign-up, no internet needed. Nothing you scan or play leaves your device. Terms of Use: https://tinuv.me/spincube/terms.html Privacy Policy: https://tinuv.me/spincube/privacy.html
Screenshots
Verdict
The clearest difference is price: SpinCube at Free against PepCal's $2.99. SpinCube also leads on update cadence (every 2 days vs every 6 weeks). PepCal's advantage is in-app purchases (none vs 5) and rating (4.3 vs 4.0). On 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
SpinCube is free to download; PepCal costs $2.99 up front. SpinCube sells 5 in-app purchases, starting at $1.99 per 7 days. PepCal asks for nothing beyond the download.
PepCal holds the better App Store score, 4.3 against 4.0. That said, the two scores are not equally well evidenced: PepCal has 35 ratings behind it against 6, so its average is the more settled of the two.
PepCal ships an update every 6 weeks, SpinCube every 2 days. The most recent releases landed on October 16, 2026 and October 6, 2026 respectively.
| Parameter | PepCal | SpinCube |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 4.3 (35 ratings) — better | 4.0 (6 ratings) |
| Positive reviews | 79.2% of reviews | — |
| Number of ratings | 35 — better | 6 |
| Update frequency | Every 6 weeks | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 15.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 7 MB | 24 MB |
| Age rating | 4+ | 4+ |
| Developer | A & A Design Inc. | 辉 邓 |
Customer experience
PepCal
SpinCube
In-app purchases
PepCal
No in-app purchases
SpinCube
- Weekly3 Days trial$1.997 Days
- Weekly Plan$1.997 Days
- Yearly$9.991 Year
- LifetimeFree
- 24-Hour Pass$0.99








