Comparison

Tree Survey vs Unlock PDF

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

Head to head
About

Tree Survey

Report and track infestations of the polyphagous shot hole borer (PSHB) to help manage its spread. The app aids in initiating treatment and notifying local organizations about affected areas.

Highlights
  • Report PSHB infestations
  • Track infestation spread
  • Initiate appropriate treatment
  • Notify local organizations
  • Measure PSHB spread
Features
Read full description

The polyphagous shot hole borer (PSHB) has been introduced into South Africa and it is spreading rapidly within the urban forests. Infested tree’s vascular system begins to fail, leaves start to turn brown, eventually the tree dies. Private residents, community organisations, service providers and City Parks are trying to respond to the problem, however the PSHB is very difficult to control. This app allows PSHB infestations to be reported so that appropriate treatment can be initiated. Reporting the infestation also allows the spread of the PSHB to be measured and tracked so that local organisations can be notified and appropriate measures taken.

About

Unlock PDF

Easily access password-protected documents with this secure tool. It instantly unlocks encrypted PDFs, removes restrictions, and allows quick export and sharing of your files. Works offline for enhanced privacy and features a user-friendly interface with dark mode support.

Highlights
  • Unlock password-protected PDFs
  • Remove PDF restrictions
  • Export and share unlocked files
  • Offline functionality
  • User-friendly interface
  • Dark Mode support
Features
Read full description

Welcome to Unlock PDF - Password Remover, the simple and secure way to access your locked documents. With Easily Open Encrypted PDFs, you can unlock password-protected files instantly, remove restrictions, and save time by skipping repeated password input. Whether you need to view, edit, or share important files, Unlock PDF - Password Remover makes PDF decryption fast and reliable. KEY FEATURES • PDF unlocker, remover, decryption tool, and secure solution in one app • Open password-protected or encrypted PDF files in just a few taps • Export and share unlocked PDF documents quickly • Manage the history of imported and opened PDFs • Works offline for privacy and security • Clean, user-friendly interface with full Dark Mode support • Lightweight app size under 100MB HOW IT WORKS • Launch the app and import a locked or encrypted PDF • Import from cloud drives using the native Files app • Unlock and export your PDF instantly • Share unlocked files with colleagues, friends, or across devices AUTO-RENEW SUBSCRIPTION TERMS • Subscription auto-renews unless canceled, charged via your Apple ID • Pricing may vary based on your region • No commitment; cancel anytime • Payment will be charged to your iTunes Account at confirmation of purchase • Subscription durations: 1 week and 1 year • Renewal is charged within 24 hours prior to the end of the current period • Manage or cancel via Account Settings on the App Store • Unused portion of a free trial (if offered) will be forfeited when a subscription is purchased POLICY & TERMS • Privacy Policy: https://www.envisiontechnolabs.com/privacy_policy.html?utm_source=unlock_pdf_ios&utm_medium=app_store_connect&utm_campaign=policy_url • Terms of Service: https://www.envisiontechnolabs.com/terms.html?utm_source=unlock_pdf_ios&utm_medium=app_store_connect&utm_campaign=term_url SUPPORT We’re continuously improving Unlock PDF - Password Remover to give you a faster and more secure way to open encrypted files. Your feedback helps us build a better tool for managing PDFs. If you have any questions or suggestions, contact us at: support@envisiontechnolabs.com

Screenshots

Tree Survey4 screens
Unlock PDF3 screens

Verdict

The call

The clearest difference is rating: Unlock PDF at 5.0 against Tree Survey's 2.5. Tree Survey's advantage is in-app purchases (none vs 4) and iOS requirement (10.0 vs 16.0). On price, review sentiment, ratings volume and update cadence 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

Both are free to download. Unlock PDF sells 4 in-app purchases, starting at $0.99 per 7 days. Tree Survey asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Unlock PDF holds the better App Store score, 5.0 against 2.5. Both are backed by a comparable volume of ratings — 2 and 2 respectively. Written reviews point the same way: 38% of Tree Survey's written reviews are positive against 44% of Unlock PDF's.

UpkeepUpdate frequency

Tree Survey ships an update every 3 months, Unlock PDF every 2 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

Scorecard4 real differences · 6 level
Tree Survey versus Unlock PDF: the parameters behind the verdict, then further details
ParameterTree SurveyUnlock PDF
PriceFreeFree
Rating2.5 (2 ratings)5.0 (2 ratings) — better
Positive reviews37.5% of reviews44.4% of reviews — better
Number of ratings22
Update frequencyEvery 3 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS10.0 — better16.0
Further details — not scored
Size34 MB33 MB
Age rating4+4+
DeveloperSolution House SoftwareAshvin Ajadiya

Customer experience

Tree Survey

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews8 reviews
Positive37.5%
Neutral0.0%
Negative62.5%

Unlock PDF

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews9 reviews
Positive44.4%
Neutral0.0%
Negative55.6%

In-app purchases

None

Tree Survey

No in-app purchases

4 purchases

Unlock PDF

Subscriptions3
  • Unlimited Access - Weekly$0.997 Days
  • Unlimited Access - Monthly$2.991 Month
  • Unlimited Access - Yearly3 Days trial$14.991 Year
One-time1
  • Unlimited - Unlock PDF$49.99

Questions

Is Tree Survey free?
Tree Survey is free to download, with no in-app purchases.
Is Unlock PDF free?
Unlock PDF is free to download, with in-app purchases available.
Which has better reviews, Tree Survey or Unlock PDF?
Unlock PDF is rated higher. Tree Survey averages 2.5 out of 5 from 2 ratings, while Unlock PDF averages 5.0 from 2 ratings.
Do Tree Survey or Unlock PDF have ads?
Neither Tree Survey nor Unlock PDF shows ads.
Which is updated more often, Tree Survey or Unlock PDF?
Tree Survey ships an update every 3 months, and Unlock PDF every 2 months. Most recently, Tree Survey was updated on November 2, 2026 and Unlock PDF on November 3, 2026.

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