# Sandglass3 vs Rub Memo

The clearest difference is review sentiment: Rub Memo at 100% against Sandglass3's 44%. Rub Memo also leads on ads (none vs shown) and update cadence (every 6 days vs every 8 months). Sandglass3's advantage is iOS requirement (9.0 vs 16.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Sandglass3 ships an update every 8 months, Rub Memo every 6 days. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Sandglass3 | Rub Memo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.7 (11 ratings)](https://appshunter.io/ios/app/sandglass3/id386488183/reviews)** | — |
| Number of ratings | **11** | — |
| Positive reviews | 43.8% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 8 months | **Every 6 days** |
| Monetization | Ad-supported | **Free** |
| Size | 43 MB | 14 MB |
| Requires iOS | **9.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Keietsu Yasuhara](https://appshunter.io/developer/378538320) | [seiji honda](https://appshunter.io/developer/1896430544) |

## What reviewers say

### Sandglass3

[App page](https://appshunter.io/ios/app/sandglass3/id386488183)

This app simulates a realistic hourglass with customizable timer durations. Users can flip the hourglass by swiping or rotating their device. It offers optional sound alerts and automatic rotation upon completion.

**Highlights:** Realistic hourglass simulation, 1, 3, and 6-minute timers, Swipe to flip hourglass, Rotate device to flip, Chime alert on completion, Automatic rotation option

**Features:** macOS Compatibility

**In-app purchases:** none


### Rub Memo

[App page](https://appshunter.io/ios/app/rub-memo/id6772340496)

This app allows you to erase text by rubbing your finger over it, mimicking the feel of erasing pencil on paper. It also offers a home screen widget for quick access, reordering paragraphs, and inserting various media like tables, checklists, and drawings.

**Highlights:** Erase text with finger rub, Home screen widget for notes, Reorder paragraphs by long-press and drop, Insert tables, checklists, images, and drawings, Full-text search with highlighted matches, Lock notes with Face ID/Touch ID, Export and share as PDF

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

**In-app purchases:** none


## Frequently asked questions

### Is Sandglass3 free?

Sandglass3 is free to download, with no in-app purchases.

### Is Rub Memo free?

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

### Do Sandglass3 or Rub Memo have ads?

Sandglass3 shows ads; Rub Memo does not.

### Which is updated more often, Sandglass3 or Rub Memo?

Sandglass3 ships an update every 8 months, and Rub Memo every 6 days. Most recently, Sandglass3 was updated on October 23, 2026 and Rub Memo on October 24, 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.*