# Nano Doc vs Underground Survival Game

The clearest difference is rating: Nano Doc at 3.7 against Underground Survival Game's 2.0. Nano Doc also leads on in-app purchases (none vs 7) and update cadence (every 4 days vs every 6 weeks). On price, review sentiment, ads and monetization model there is nothing between them.

Both are free to download. Underground Survival Game sells 7 one-off in-app purchases. Nano Doc asks for nothing beyond the download.

Nano Doc holds the better App Store score, 3.7 against 2.0. Both are backed by a comparable volume of ratings — 3 and 1 respectively. Written reviews split almost evenly too, at 0% and 0% positive.

Nano Doc ships an update every 4 days, Underground Survival Game every 6 weeks. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Nano Doc | Underground Survival Game |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.7 (3 ratings)](https://appshunter.io/ios/app/nano-doc/id1472458404/reviews)** | [2.0 (1 ratings)](https://appshunter.io/ios/app/underground-survival-game/id6752687005/reviews) |
| Number of ratings | **3** | 1 |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 6 weeks |
| Monetization | Free | Free |
| Size | 205 MB | 264 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 9+ | 4+ |
| Developer | [Christopher Carnell](https://appshunter.io/developer/1469758841) | [Talha Abbasi](https://appshunter.io/developer/1830457369) |

## What reviewers say

### Nano Doc

[App page](https://appshunter.io/ios/app/nano-doc/id1472458404)

Engage in a microscopic battle within a patient's bloodstream. Your mission is to eliminate invading bacteria and viruses while carefully avoiding vital red and white blood cells. Manage the patient's infection rate and temperature to prevent critical organ damage and win the game.

**Highlights:** Fight bacteria and viruses, Avoid red blood cells, Avoid white blood cells, Manage infection rate, Monitor patient temperature, Prevent brain cell death

**Features:** macOS Compatibility

**In-app purchases:** none


### Underground Survival Game

[App page](https://appshunter.io/ios/app/underground-survival-game/id6752687005)

Embark on an intense underground escape adventure. Navigate treacherous tunnels, avoid obstacles, and test your reflexes to find freedom before time runs out. Every level offers new challenges and unpredictable paths.

**Highlights:** Intense underground adventure, Speed strategy and survival, Avoid traps and obstacles, Challenging tunnel navigation, Fast-paced escape gameplay, Increasing difficulty

**Features:** macOS Compatibility

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| prisonescapedcashsmallbundle | $1.99 | one-time |
| prisonescapeddrinksmallbundle | $1.99 | one-time |
| prisonescapeddrinkmediumbundle | $1.99 | one-time |
| prisonescapedcashmediumbundle | $2.99 | one-time |
| prisonremoveads | $3.99 | one-time |
| prisonescapedcashbigbundle | $4.99 | one-time |
| prisonescapeddrinkbigbundle | $4.99 | one-time |


## Frequently asked questions

### Is Nano Doc free?

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

### Is Underground Survival Game free?

Underground Survival Game is free to download, with in-app purchases available.

### Which has better reviews, Nano Doc or Underground Survival Game?

Nano Doc is rated higher. Nano Doc averages 3.7 out of 5 from 3 ratings, while Underground Survival Game averages 2.0 from 1 ratings.

### Do Nano Doc or Underground Survival Game have ads?

Neither Nano Doc nor Underground Survival Game shows ads.

### Which is updated more often, Nano Doc or Underground Survival Game?

Nano Doc ships an update every 4 days, and Underground Survival Game every 6 weeks. Most recently, Nano Doc was updated on November 3, 2026 and Underground Survival Game on October 30, 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.*