PDF Search PRO vs Sound Meter Plus
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PDF Search PRO
This app offers a powerful solution for searching through multiple documents quickly using AI and NLP. It includes features like OCR for text recognition in scanned documents and images, and allows for unified searching across devices.
- AI-powered document search
- Natural Language Processing (NLP)
- Built-in OCR for text recognition
- Document scanning to PDF
- Exportable search results
- Cross-device syncing
Read full descriptionHide full description
PDF Search PRO turns everything you own into a library you can search in the time it takes to type. Books, textbooks, lecture notes, contracts, papers and manuals, all ranked by how well they answer you. Ask a question in plain words and get an answer, with the exact pages it came from. Everything is included from the first launch. No subscription, no in-app purchases, no ads. Built for people who live in documents: students, lawyers and researchers. ASK YOUR LIBRARY ANYTHING AI Chat answers questions about your library in plain language. Ask "can I end my lease early?" and it searches your documents, reads the pages that matter, and answers, citing the page each fact came from so you can check it yourself. • Chat about your whole library, or the one document you are reading • Every answer carries page references you can tap • Conversations are saved, so you can pick one up later • Runs on your device, or on Apple's Private Cloud Compute AI Chat needs Apple Intelligence: an iPhone 15 Pro or later, or an iPad with an M-series chip, running iOS 26 or later. A FINDER THAT RANKS, NOT JUST MATCHES Ordinary search tells you a word exists somewhere. PDF Search PRO scores every page on how well it answers you: where the words appear, how close together they are, whether they land in a heading. The strongest pages come first. • Every ranked result, grouped by book or document • Jump straight to the page, your words highlighted in context • Search everything at once, or narrow to a folder or tag • Search only the table of contents, match case, skip duplicates • Export and share results LANGUAGE, NOT JUST LETTERS The indexer understands the shape of a word. Look for "hike" and find "hiking"; look for "children" and find "child". Plurals, stems and near matches are covered too. WORDS LOCKED IN IMAGES Text recognition reads photographed pages, scanned contracts and screenshots of slides, and adds every word to your index. A photo of a page becomes as searchable as the page itself, in every language your device supports. The built-in scanner turns paper, notes and cards into PDFs and files them with everything else, searchable from the moment they land. NOTES, HIGHLIGHTS AND MARKUP • Highlight, underline and strike through while you read • Bookmarks with notes, gathered in one place across every book • A document's table of contents, for moving around a long textbook quickly AN ORGANIZER FOR A LARGE LIBRARY • Folders on device or in iCloud, plus any folder or file you point it at • Tags, to cut across folders however you think • Index status at a glance: what is indexed and what is queued • PDFs alongside Word and PowerPoint, Pages and Keynote, rich text, plain text, source code and saved web pages YOUR MAC, IN YOUR POCKET Run PDF Search on your Mac and sync over Wi-Fi with a single click. Documents come across with their index intact, so your iPhone or iPad does not have to do the work twice. OFFLINE AND PRIVATE Indexing and search happen entirely on your device and work without a connection. No account and no tracking. Your documents stay yours. PAY ONCE PDF Search PRO is a one-time purchase. Every feature above is yours on every iPhone and iPad signed in to your Apple Account, with no renewals. Privacy Policy: https://pdfsearch.mozkan.com/privacy.html Terms of Use: https://pdfsearch.mozkan.com/terms.html
Sound Meter Plus
Read full descriptionHide full description
Sound Meter is a utility tool that shows decibel values by measuring the environmental noise, displaying dB values in various forms. Features: • Toggle tap to start or stop recording sound data • Save dB sound data image into Camera Roll • Save recorded sound into the Files app • Copy dB sound data to Clipboard for advanced operations • Show average, minimum, and maximum decibel values per second • Indicate decibel levels with a graph line • Display the current noise reference • Display decibel levels with a graph line • Display elapsed time of decibel readings • Calibrate the decibel readings A sound level meter is used for acoustic measurements. It is commonly a hand-held instrument with a microphone. The diaphragm of the microphone responds to changes in air pressure caused by sound waves. That is why the instrument is sometimes referred to as a Sound Pressure Level Meter. The decibel is a unit of measurement used to express the ratio of one value of a power or field quantity to another on a logarithmic scale. This logarithmic quantity is called the power level or field level, respectively. It can be used to express either a change in value or an absolute value. A noise level chart showing examples of sounds with dB levels ranging from 0 to 180 decibels: 180 – Rocket launch 140 – Jet engine at takeoff 120 – Thunderclap 110 – Rock band 100 – Motorcycle 90 – Lawn mower 80 – Alarm clock 70 – Shower 60 – Conversational speech 50 – Light traffic 30 – Whisper 20 – Rustling leaves 10 – A pin dropping 0 – Healthy hearing threshold Sample Sound Data: \[50.256, 51.245, ..., 65.359] You can calibrate your device with an actual sound meter (dBA). Microphones in most devices are limited and should be used as auxiliary tools. For more accurate dB values, we recommend using a dedicated sound level meter. Thanks for your support! Visit nitrio.com for more apps for your iOS devices.
Screenshots
Verdict
The clearest difference is price: Sound Meter Plus at $2.99 against PDF Search PRO's $44.99. Sound Meter Plus also leads on iOS requirement (12.0 vs 16.0). PDF Search PRO's advantage is rating (4.6 vs 1.0) and update cadence (monthly vs every 39 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
PDF Search PRO costs $44.99 and Sound Meter Plus $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
PDF Search PRO holds the better App Store score, 4.6 against 1.0. That said, the two scores are not equally well evidenced: PDF Search PRO has 9 ratings behind it against 1, so its average is the more settled of the two.
PDF Search PRO ships an update monthly, Sound Meter Plus every 39 months. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.
| Parameter | PDF Search PRO | Sound Meter Plus |
|---|---|---|
| Price | $44.99 | $2.99 — better |
| Rating | 4.6 (9 ratings) — better | 1.0 (1 ratings) |
| Positive reviews | 80.0% of reviews | — |
| Number of ratings | 9 — better | 1 |
| Update frequency | Monthly — better | Every 39 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 15 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Muharrem Ozkan | Heng Jia Liang |
In-app purchases
PDF Search PRO
No in-app purchases
Sound Meter Plus
No in-app purchases
Questions
Is PDF Search PRO free?
Is Sound Meter Plus free?
Which has better reviews, PDF Search PRO or Sound Meter Plus?
Do PDF Search PRO or Sound Meter Plus have ads?
Which is updated more often, PDF Search PRO or Sound Meter Plus?
Other comparisons















