# Mobile Signer vs OBDocker

The clearest difference is rating: OBDocker at 4.2 against Mobile Signer's 1.0. OBDocker also leads on update cadence (fortnightly vs every 3 months) and ratings volume (17 vs 1). Mobile Signer's advantage is in-app purchases (none vs 7) and iOS requirement (8.0 vs 13.0). On price, review sentiment, ads and device support there is nothing between them.

Both are free to download. OBDocker sells 7 in-app purchases, starting at $2.99 per month. Mobile Signer asks for nothing beyond the download.

OBDocker holds the better App Store score, 4.2 against 1.0. That said, the two scores are not equally well evidenced: OBDocker has 17 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 50% of Mobile Signer's written reviews are positive against 47% of OBDocker's, so the app with the better star average is not the one people write more warmly about.

Mobile Signer ships an update every 3 months, OBDocker fortnightly. The most recent releases landed on October 16, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Mobile Signer | OBDocker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/mobile-signer/id573555121/reviews) | **[4.2 (17 ratings)](https://appshunter.io/ios/app/obdocker-obd2-car-scanner/id6466999549/reviews)** |
| Number of ratings | 1 | **17** |
| Positive reviews | **50.0% of reviews** | 46.9% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Fortnightly** |
| Monetization | **Free** | Freemium |
| Size | 15 MB | 238 MB |
| Requires iOS | **8.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Factum Identity Solutions SL](https://appshunter.io/developer/1628978172) | [Motorsure. Inc](https://appshunter.io/developer/1707281085) |

## What reviewers say

### Mobile Signer

[App page](https://appshunter.io/ios/app/mobile-signer/id573555121)

This app enables electronic digital signatures for various document formats on mobile devices. It integrates with business applications and supports advanced signature types, including time stamping and certificate validation.

**Highlights:** Electronic digital signature integration, Supports PDF, XML, Office, and Open Office formats, Generates advanced signature formats (PKCS#7/CMS, CAdES, XMLDSig, XAdES, PDF Signature, PAdES), Time stamping of signatures, Certificate validation authority, Mobility signatures from smartphones and tablets, Client and server signing options

**Features:** macOS Compatibility

**In-app purchases:** none


### OBDocker

[App page](https://appshunter.io/ios/app/obdocker-obd2-car-scanner/id6466999549)

This app acts as a professional OBD2 car scanner, enabling users to diagnose, service, and customize their vehicles. It offers comprehensive diagnostic modes, real-time data monitoring, and various service functions like oil resets and battery registration.

**Highlights:** Triple-mode diagnostics (Full-Systems, Multi-Systems, Quick Scan), Triple-mode live data monitoring (Health, Engine, Dash), Full-cycle service functions (Emissions Pre-Check, Control Tests, Oil Reset, Battery Registration), One-click car setting adjustments and retrofits, Supports a wide range of car brands and models

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OBD Pro (Monthly) | $2.99 | per month |
| OBD Pro Max (Monthly) | $7.99 | per month |
| OBD2 Pro (6 Months) | $14.99 | per 6 months |
| OBD Pro (Annual) | $17.99 | per year |
| Mechanic Access (Quarterly) | $19.99 | per 3 months |
| OBD Pro Max (Annual) | $47.99 | per year |
| OBD Pro Max (Permanent) | $119.99 | one-time |


## Frequently asked questions

### Is Mobile Signer free?

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

### Is OBDocker free?

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

### Which has better reviews, Mobile Signer or OBDocker?

OBDocker is rated higher. Mobile Signer averages 1.0 out of 5 from 1 ratings, while OBDocker averages 4.2 from 17 ratings.

### Do Mobile Signer or OBDocker have ads?

Neither Mobile Signer nor OBDocker shows ads.

### Which is updated more often, Mobile Signer or OBDocker?

Mobile Signer ships an update every 3 months, and OBDocker fortnightly. Most recently, Mobile Signer was updated on October 16, 2026 and OBDocker on October 15, 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.*