# TrustDoc vs LockSign

The clearest difference is in-app purchases: TrustDoc at none against LockSign's 2. TrustDoc also leads on iOS requirement (13.1 vs 17.4). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. LockSign sells 2 in-app purchases, starting at $5.99 per month. TrustDoc asks for nothing beyond the download.

TrustDoc ships an update every 2 weeks, LockSign fortnightly. The most recent releases landed on October 7, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | TrustDoc | LockSign |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Fortnightly |
| Size | 31 MB | 72 MB |
| Requires iOS | **13.1** | 17.4 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [NFC Touch Limited](https://appshunter.io/developer/1437862701) | [LockSign LLC](https://appshunter.io/developer/1489917418) |

## What reviewers say

### TrustDoc

[App page](https://appshunter.io/ios/app/trustdoc/id1482370701)

**In-app purchases:** none


### LockSign

[App page](https://appshunter.io/ios/app/locksign-secure-signatures/id1571283461)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Standard | $5.99 | per month |
| Premium | $9.99 | per month |


## Frequently asked questions

### Is TrustDoc free?

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

### Is LockSign free?

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

### Do TrustDoc or LockSign have ads?

Neither TrustDoc nor LockSign shows ads.

### Which is updated more often, TrustDoc or LockSign?

TrustDoc ships an update every 2 weeks, and LockSign fortnightly. Most recently, TrustDoc was updated on October 7, 2026 and LockSign on October 13, 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.*