Hexaflexagons vs Calcu
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Hexaflexagons
Design and create unique paper puzzles with hidden sides. Personalize them with your own designs or use templates for secret messages, photo gifts, or custom cards.
- Design custom hexaflexagons
- Use pre-made designs
- Create secret messages
- Make photo gifts
- Design birthday cards
- Printable designs
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Hexaflexagons are the ultimate paper puzzle, and this app helps you design and make them. What is a hexaflexagon, you ask? It's a paper puzzle that has a front side, a back side, plus hidden sides. It's fun to give them to your friends to see if they can find the hidden sides. Hexaflexagons are great for sending secret messages. Or as photo gifts. Or birthday cards. You can customize your own hexaflexagon or start from one of our designs. Please note that after a limited trial, a $3.99 unlimited use upgrade is required in order to have the app send you designs that you can print and fold at home.
Calcu
This app provides advanced logarithmic calculations and explanations, covering equation solving, Taylor series, digit-by-digit computation, and integral definitions. It also simplifies expressions, solves complex logarithmic equations, and includes a virtual slide rule.
- Solves logarithmic equations for y, x, and a
- Explains Taylor series for log_e(x)
- Illustrates digit-by-digit log_10(x) computation
- Explains log_e definition via integrals
- Simplifies logarithmic expressions
- Calculates and graphs complex logarithms
- Includes virtual slide rule
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Calcu-Logarithm performs calculations and helps user understand logarithms on advanced level: 1. Solves equation "y = log_a(x)” for “y”, “x”, and “a”, with relevant graphs. 2. Explains and illustrates how to compute log_e (x) from Taylor series. 3. Explains and illustrates how to compute log_10 (x) digit by digit (based on M.Goldberg algorithm). 4. Explains and provides proof of log_e definition as the integral of x inverse. 5. Simplifies logarithmic expressions and solves logarithmic equations with polynomials of up to 20th degree. 6. Includes virtual slide rule for multiplication and division. 7. Calculates, explains, and graphs logarithms of complex numbers. Developers welcome any feedback, please write to us at graphmath@aol.com. Please check out our other Math apps.
Screenshots
Verdict
The clearest difference is in-app purchases: Calcu at none against Hexaflexagons's 2. Calcu also leads on update cadence (every 3 days vs monthly). Hexaflexagons's advantage is ratings volume (27 vs 1) and iOS requirement (13.0 vs 15.0). On price, rating, 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. Hexaflexagons sells 2 one-off in-app purchases. Calcu asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for Hexaflexagons against 5.0 for Calcu. That said, the two scores are not equally well evidenced: Hexaflexagons has 27 ratings behind it against 1, so its average is the more settled of the two.
Hexaflexagons ships an update monthly, Calcu every 3 days. Both last shipped on June 8, 2026.
| Parameter | Hexaflexagons | Calcu |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (27 ratings) | 5.0 (1 ratings) |
| Positive reviews | 97.7% of reviews | — |
| Number of ratings | 27 — better | 1 |
| Update frequency | Monthly | Every 3 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 38 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | VUXO I, CORP. | Yuri Morozov |
Customer experience
Hexaflexagons
Calcu
In-app purchases
Hexaflexagons
- Make unlimited hexaflexagons$3.99
- Make unlimited hexaflexagons$4.99
Calcu
No in-app purchases
