# Calca vs SPYDERWEB

The clearest difference is price: SPYDERWEB at Free against Calca's $9.99. SPYDERWEB also leads on in-app purchases (none vs 2) and update cadence (weekly vs every 5 months). Calca's advantage is iOS requirement (15.0 vs 17.0). On ads and device support there is nothing between them.

SPYDERWEB is free to download; Calca costs $9.99 up front. Calca sells 2 one-off in-app purchases. SPYDERWEB asks for nothing beyond the download.

Calca ships an update every 5 months, SPYDERWEB weekly. The most recent releases landed on September 25, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Calca | SPYDERWEB |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[4.5 (153 ratings)](https://appshunter.io/ios/app/calca/id635757879/reviews)** | — |
| Number of ratings | **153** | — |
| Positive reviews | 76.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 months | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 78 MB | 60 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Krueger Systems, Inc.](https://appshunter.io/developer/299293363) | [GJR Meyer Service Inc.](https://appshunter.io/developer/1623152545) |

## What reviewers say

### Calca

[App page](https://appshunter.io/ios/app/calca/id635757879)

This app is an advanced symbolic calculator and text editor. It solves equations, simplifies expressions, and allows you to explain your work alongside calculations. Calculations update instantly as you type, and all data is stored as plain text for easy sharing and device syncing.

**Highlights:** Symbolic calculation, Equation solving, Expression simplification, Markdown text editor, Real-time updates, Unit and currency conversion, Matrix operations

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 6-Month Optional Patronage | $4.99 | one-time |
| 12-Month Optional Patronage | $7.99 | one-time |

**What reviewers like**

- 💡 Unique blend of text editor and calculator
- 📝 Markdown support for documentation
- 🔄 Dynamic recalculation of all values
- ⚙️ Powerful mathematical and algebraic capabilities
- 📊 Unit conversion and unit-aware calculations

**What reviewers complain about**

- 🐛 Magic Keyboard input bugs on iPad
- ⚠️ Appears abandoned or poorly maintained
- 🐛 Text selection issues with external keyboards
- 📱 iPad landscape mode problems
- 🐛 Cursor jumping and screen jumping during editing

**Reported bugs**

- Magic Keyboard causes number input to overwrite instead of append
- Text selection before numbers triggers increment/decrement instead of selecting
- Cursor jumps forward and backward with external keyboards
- iPad Pro keyboard truncation in portrait mode
- Arrow key (=>) doesn't work in landscape mode

**Requested features**

- Files app and document browser integration
- Dropbox and Google Drive support
- Date calculation functionality
- Looping and iteration support
- User-defined function storage in separate files


### SPYDERWEB

[App page](https://appshunter.io/ios/app/spyderweb/id1623152543)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Calca free?

Calca costs $9.99, and also offers in-app purchases.

### Is SPYDERWEB free?

SPYDERWEB is free to download, with no in-app purchases.

### Do Calca or SPYDERWEB have ads?

Neither Calca nor SPYDERWEB shows ads.

### Which is updated more often, Calca or SPYDERWEB?

Calca ships an update every 5 months, and SPYDERWEB weekly. Most recently, Calca was updated on September 25, 2026 and SPYDERWEB on September 13, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*