# Scientific Timer vs Calpaper

The clearest difference is price: Calpaper at Free against Scientific Timer's $0.99. Calpaper also leads on update cadence (daily vs every 16 months). Scientific Timer's advantage is in-app purchases (none vs 1). On ads, device support and iOS requirement there is nothing between them.

Calpaper is free to download; Scientific Timer costs $0.99 up front. Calpaper sells 1 one-off in-app purchase. Scientific Timer asks for nothing beyond the download.

Scientific Timer ships an update every 16 months, Calpaper daily. Both last shipped on November 8, 2026.

## The numbers

| Metric | Scientific Timer | Calpaper |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[4.0 (4 ratings)](https://appshunter.io/ios/app/calpaper-lock-screen-calendar/id6818876548/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 83.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 16 months | **Daily** |
| Monetization | — | Free with in-app purchases |
| Size | 8 MB | 23 MB |
| Requires iOS | 18.0 | 18.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Stephane Boutet](https://appshunter.io/developer/1794014850) | [Daniel Garcia](https://appshunter.io/developer/1891378861) |

## What reviewers say

### Scientific Timer

[App page](https://appshunter.io/ios/app/scientific-timer/id6741395405)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Calpaper

[App page](https://appshunter.io/ios/app/calpaper-lock-screen-calendar/id6818876548)

Transform your lock screen into a dynamic calendar. Display today's events, reminders, countdowns, notes, and photos. Customize colors, fonts, and layouts to stay organized at a glance.

**Highlights:** Lock screen calendar display, Event and reminder integration, Countdown timers, Customizable notes and photos, Multiple color themes, Design saving and switching

**Features:** iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Calpaper Pro | $6.99 | one-time |


## Frequently asked questions

### Is Scientific Timer free?

Scientific Timer costs $0.99, with no in-app purchases.

### Is Calpaper free?

Calpaper is free to download, with in-app purchases available.

### Do Scientific Timer or Calpaper have ads?

Neither Scientific Timer nor Calpaper shows ads.

### Which is updated more often, Scientific Timer or Calpaper?

Scientific Timer ships an update every 16 months, and Calpaper daily. Most recently, Scientific Timer was updated on November 8, 2026 and Calpaper on November 8, 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.*