# Topo Mobile vs Survey C

The clearest difference is in-app purchases: Topo Mobile at none against Survey C's 1. Topo Mobile also leads on iOS requirement (8.0 vs 17.6). Survey C's advantage is update cadence (weekly vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. Survey C sells 1 one-off in-app purchase. Topo Mobile asks for nothing beyond the download.

Topo Mobile ships an update every 2 months, Survey C weekly. Both last shipped on October 28, 2026.

## The numbers

| Metric | Topo Mobile | Survey C |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Size | 30 MB | 5 MB |
| Requires iOS | **8.0** | 17.6 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [SA PRESENCE](https://appshunter.io/developer/1056041008) | [Ngoc Tung Nguyen](https://appshunter.io/developer/1123458177) |

## What reviewers say

### Topo Mobile

[App page](https://appshunter.io/ios/app/topo-mobile/id1085488342)

**Features:** macOS Compatibility

**In-app purchases:** none


### Survey C

[App page](https://appshunter.io/ios/app/survey-c-plus-autocad-export/id6756013455)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $200.00 | one-time |


## Frequently asked questions

### Is Topo Mobile free?

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

### Is Survey C free?

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

### Do Topo Mobile or Survey C have ads?

Neither Topo Mobile nor Survey C shows ads.

### Which is updated more often, Topo Mobile or Survey C?

Topo Mobile ships an update every 2 months, and Survey C weekly. Most recently, Topo Mobile was updated on October 28, 2026 and Survey C on October 28, 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.*