Comparison

HAHA Lock vs Page Vault Reader

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head

HAHA Lock

Smart lock management

Private Local Reader with OCR

$1.99

🔧 Utilities

No ratingsView app →

About

HAHA Lock

Features

Read full description

Add or delete the unlock permission of the smart lock through Bluetooth

About

Page Vault Reader

Features

Read full description

Page Vault Reader is a private, local reader for EPUBs, PDFs, and scanned documents. Import your own books, research papers, manuals, guides, and scanned files, then keep them in one clean library. Imported files, library data, and reading progress stay on this device. There is no account, no cloud sync, and no document upload by default. For scanned PDFs and image-only pages, OCR can turn hard-to-use pages into readable text. Page Vault Reader does not provide or distribute copyrighted books. Imported files are for your own reading and document management.

Screenshots

HAHA Lock4 screens

Page Vault Reader4 screens

Verdict

The call

The clearest difference is price: HAHA Lock at Free against Page Vault Reader's $1.99. HAHA Lock also leads on iOS requirement (12.0 vs 18.5). Page Vault Reader's advantage is update cadence (every 3 days vs every 5 months). On ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

HAHA Lock is free to download; Page Vault Reader costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

HAHA Lock ships an update every 5 months, Page Vault Reader every 3 days. The most recent releases landed on October 1, 2026 and September 29, 2026 respectively.

Scorecard3 real differences · 3 level

HAHA Lock versus Page Vault Reader: the parameters behind the verdict, then further details
Parameter	HAHA Lock	Page Vault Reader
Price	Free — better	$1.99
Update frequency	Every 5 months	Every 3 days — better
Ads	No	No
In-app purchases	No	No
Devices	iPhone, iPod — better	iPhone
Requires iOS	12.0 — better	18.5
Further details — not scored
Size	23 MB	12 MB
Age rating	4+	4+
Developer	映宇陈	建亮王

In-app purchases

None

HAHA Lock

No in-app purchases

None

Page Vault Reader

No in-app purchases

Questions

Is HAHA Lock free?

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

Is Page Vault Reader free?

Page Vault Reader costs $1.99, with no in-app purchases.

Do HAHA Lock or Page Vault Reader have ads?

Neither HAHA Lock nor Page Vault Reader shows ads.

Which is updated more often, HAHA Lock or Page Vault Reader?

HAHA Lock ships an update every 5 months, and Page Vault Reader every 3 days. Most recently, HAHA Lock was updated on October 1, 2026 and Page Vault Reader on September 29, 2026.