# Check Writer vs Spatial Data Platform (SDP)

The clearest difference is in-app purchases: Spatial Data Platform (SDP) at none against Check Writer's 1. Spatial Data Platform (SDP) also leads on update cadence (every 6 weeks vs every 4 months). Check Writer's advantage is iOS requirement (14.0 vs 16.4). On price, ads and device support there is nothing between them.

Both are free to download. Check Writer sells 1 one-off in-app purchase. Spatial Data Platform (SDP) asks for nothing beyond the download.

Check Writer ships an update every 4 months, Spatial Data Platform (SDP) every 6 weeks. The most recent releases landed on October 7, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Check Writer | Spatial Data Platform (SDP) |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.4 (12 ratings)](https://appshunter.io/ios/app/check-writer-amount-to-words/id1263881707/reviews)** | — |
| Number of ratings | **12** | — |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 6 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 8 MB | 58 MB |
| Requires iOS | **14.0** | 16.4 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Bhargav Narola](https://appshunter.io/developer/1045586550) | [The iGlobe Group Control (Pty) Ltd](https://appshunter.io/developer/1654681795) |

## What reviewers say

### Check Writer

[App page](https://appshunter.io/ios/app/check-writer-amount-to-words/id1263881707)

Instantly convert numerical amounts into written words for checks, invoices, and financial documents. Avoid errors and save time with this simple, fast tool. Supports large numbers and is ideal for users in the US, UK, Canada, and Australia.

**Highlights:** Instant number to words conversion, Check writing support (US & UK), Handles large numbers, Clean and simple interface, Copy and share functionality, Ideal for invoices and accounting

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Get All Language | $2.99 | one-time |


### Spatial Data Platform (SDP)

[App page](https://appshunter.io/ios/app/spatial-data-platform-sdp/id6593671399)

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

**In-app purchases:** none


## Frequently asked questions

### Is Check Writer free?

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

### Is Spatial Data Platform (SDP) free?

Spatial Data Platform (SDP) is free to download, with no in-app purchases.

### Do Check Writer or Spatial Data Platform (SDP) have ads?

Neither Check Writer nor Spatial Data Platform (SDP) shows ads.

### Which is updated more often, Check Writer or Spatial Data Platform (SDP)?

Check Writer ships an update every 4 months, and Spatial Data Platform (SDP) every 6 weeks. Most recently, Check Writer was updated on October 7, 2026 and Spatial Data Platform (SDP) on October 6, 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.*