# Time Machine vs Letter Drop Challenge

The clearest difference is in-app purchases: Letter Drop Challenge at none against Time Machine's 8. Letter Drop Challenge also leads on ads (none vs shown) and update cadence (monthly vs every 5 months). Time Machine's advantage is iOS requirement (13.4 vs 17.6). On price and device support there is nothing between them.

Both are free to download. Time Machine sells 8 one-off in-app purchases. Letter Drop Challenge asks for nothing beyond the download.

Time Machine ships an update every 5 months, Letter Drop Challenge monthly. The most recent releases landed on October 21, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Time Machine | Letter Drop Challenge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (4.5K ratings)](https://appshunter.io/ios/app/time-machine-hidden-objects/id1468066239/reviews)** | — |
| Number of ratings | **4.5K** | — |
| Positive reviews | 64.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 5 months | **Monthly** |
| Monetization | Free with in-app purchases | — |
| Size | 227 MB | 9 MB |
| Requires iOS | **13.4** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 9+ | 4+ |
| Developer | [Crisp App Studio](https://appshunter.io/developer/1143551614) | [Ewan Sanderson](https://appshunter.io/developer/1885588625) |

## What reviewers say

### Time Machine

[App page](https://appshunter.io/ios/app/time-machine-hidden-objects/id1468066239)

Embark on a thrilling hidden object adventure across time. Solve mysteries, find objects, and restore disassembled items in vibrant, animated 3D environments. Replay scenes for new challenges and rewards.

**Highlights:** Hidden object searching, Spot the differences, Puzzles, Object restoration, Time travel exploration, Collectible rewards

**Features:** Family Sharing, Vision Pro support

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Instant Hint | $0.99 | one-time |
| Preview Hints Pack | $0.99 | one-time |
| Handful of Coins | $0.99 | one-time |
| Infinity Energy + No Ads | $1.99 | one-time |
| Bag with Coins | $2.99 | one-time |
| GoldMaster Special | $3.99 | one-time |
| Сhest with Coins | $4.99 | one-time |
| Master Pack: All-included | $7.99 | one-time |

**What reviewers like**

- 🚀 Lots of fun
- 👍 Challenging but enjoyable
- 🎨 Great graphics
- 🎶 Enjoyable music
- 🧠 Good brain exercise

**What reviewers complain about**

- 🚧 Too many ads
- 🔍 Difficult to see objects
- 🕹️ Repetitive gameplay
- 🤔 Unclear progression
- 🕰️ Short game length

**Reported bugs**

- Missing/incorrect objects
- Glitches with certain features

**Requested features**

- More levels and content
- Zoom functionality
- Customizable brightness/contrast
- Better instructions and guidance


### Letter Drop Challenge

[App page](https://appshunter.io/ios/app/letter-drop-challenge/id6760661748)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Time Machine free?

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

### Is Letter Drop Challenge free?

Letter Drop Challenge is free to download, with no in-app purchases.

### Do Time Machine or Letter Drop Challenge have ads?

Time Machine shows ads; Letter Drop Challenge does not.

### Which is updated more often, Time Machine or Letter Drop Challenge?

Time Machine ships an update every 5 months, and Letter Drop Challenge monthly. Most recently, Time Machine was updated on October 21, 2026 and Letter Drop Challenge on October 19, 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.*