# SecureDoc · Document Vault AI vs Proof Locker

The clearest difference is ads: SecureDoc · Document Vault AI at none against Proof Locker's shown. Proof Locker's advantage is update cadence (every 8 days vs every 3 weeks) and iOS requirement (15.1 vs 17.6). On price, in-app purchases and device support there is nothing between them.

Both are free to download. SecureDoc · Document Vault AI sells 3 in-app purchases, starting at $2.99 per month and Proof Locker sells 2 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.

SecureDoc · Document Vault AI ships an update every 3 weeks, Proof Locker every 8 days. The most recent releases landed on September 18, 2026 and July 24, 2026 respectively.

## The numbers

| Metric | SecureDoc · Document Vault AI | Proof Locker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/proof-locker/id6789418422/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Every 8 days** |
| Monetization | — | Free with in-app purchases |
| Size | 28 MB | 48 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Frantisek Varadzin](https://appshunter.io/developer/1782157075) | [Justin Cummins](https://appshunter.io/developer/6784898982) |

## What reviewers say

### SecureDoc · Document Vault AI

[App page](https://appshunter.io/ios/app/securedoc-document-vault-ai/id6748312274)

**Features:** Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SecureDoc PRO | $2.99 | per month |
| English | $3.99 | per month |
| Unlimited Access | $24.99 | per year |


### Proof Locker

[App page](https://appshunter.io/ios/app/proof-locker/id6789418422)

Organize and export important documents, agreements, and photo-backed records as clear PDF reports. This local-first app keeps your data on your device, giving you control over sharing and export.

**Highlights:** Create proof files and agreement records, Add photos and factual notes, Timestamp and GPS address stamps, Export PDF reports, Local-first data storage, Edit and filter saved records, Advanced PDF layouts and signature tools

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Proof Locker Plus | $6.99 | per month |
| Proof Locker Pro | $12.99 | per month |


## Frequently asked questions

### Is SecureDoc · Document Vault AI free?

SecureDoc · Document Vault AI is free to download, with in-app purchases available.

### Is Proof Locker free?

Proof Locker is free to download, with in-app purchases available.

### Do SecureDoc · Document Vault AI or Proof Locker have ads?

Proof Locker shows ads; SecureDoc · Document Vault AI does not.

### Which is updated more often, SecureDoc · Document Vault AI or Proof Locker?

SecureDoc · Document Vault AI ships an update every 3 weeks, and Proof Locker every 8 days. Most recently, SecureDoc · Document Vault AI was updated on September 18, 2026 and Proof Locker on July 24, 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.*