# Paperlock vs Sungrade

The clearest difference is price: Paperlock at Free against Sungrade's $0.99. Sungrade's advantage is update cadence (every 4 days vs every 13 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Paperlock is free to download; Sungrade costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Paperlock ships an update every 13 months, Sungrade every 4 days. The most recent releases landed on October 24, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Paperlock | Sungrade |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 4 days** |
| Size | 1 MB | 34 MB |
| Requires iOS | 18.5 | **17.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [John Larson](https://appshunter.io/developer/1838381602) | [Robert Corbin](https://appshunter.io/developer/1890247992) |

## What reviewers say

### Paperlock

[App page](https://appshunter.io/ios/app/paperlock-document-vault/id6752235497)

**In-app purchases:** none


### Sungrade

[App page](https://appshunter.io/ios/app/sungrade-window-sun-tracker/id6776849435)

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

**In-app purchases:** none


## Frequently asked questions

### Is Paperlock free?

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

### Is Sungrade free?

Sungrade costs $0.99, with no in-app purchases.

### Do Paperlock or Sungrade have ads?

Neither Paperlock nor Sungrade shows ads.

### Which is updated more often, Paperlock or Sungrade?

Paperlock ships an update every 13 months, and Sungrade every 4 days. Most recently, Paperlock was updated on October 24, 2026 and Sungrade on October 18, 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.*