P51 vs Voice Reader
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
P51
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The P51 application is built by La Ruta del Clima thanks to the collaboration of NEXT, its objective is to generate information and knowledge about the effects of climate change from communities on various issues such as infrastructure, changes in the territory, effects on human rights, loss of species and territory, among others. Damage and loss respond to the negative outcome or consequences of Climate Change that have exceeded the limits of adaptation.Currently, many communities in developing countries have to live with these consequences and are not visible in decision-making spaces due to the lack of information and ignorance of these consequences in the daily lives of many people. It is for this reason that through this tool you can participate in the collection and recording of data that will help to demonstrate and modify the responses of various sectors such as planning, risk management and political spaces in the face of climate change. The greatest importance of using the application is that the first line of information gathering is you as users, who live daily the damages and losses in your communities and for this reason it is defined as a citizen science tool. This is how the collection of this information allows, through the analysis of the various reports, to define actions and repairs that respond to the communities. The P51 App is running on the SPOTTERON Citizen Science Platform at www.spotteron.net.
Voice Reader
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Listen to any text—type or scan photos of books and textbooks for hands-free playback during your spare time. Perfect for: • While doing housework • During exercise • On your commute • Memorization • Language learning • Exam and certification prep Use cases: • Listen to your own audiobooks • Catch typos by ear • Count characters easily • Use as a notepad • Boost memorization Main features: • Reads any text aloud • OCR: Scan and import text from photos • Character counting • Sync notes via iCloud—share across iPhone and iPad • Create voice files (WAV format) • Continuous playback of all notes or playlists • Switch voices, including Siri • Start playback from any cursor position • Supports Japanese, English, Chinese, French, German, Korean, Portuguese, Spanish (more upon request) • Background playback; control via earphones • Adjustable playback speed
Screenshots
Verdict
The clearest difference is in-app purchases: P51 at none against Voice Reader's 3. P51 also leads on ads (none vs shown) and iOS requirement (11.0 vs 18.0). Voice Reader's advantage is update cadence (every 6 days vs every 2 weeks). On price 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
Both are free to download. Voice Reader sells 3 one-off in-app purchases. P51 asks for nothing beyond the download.
P51 ships an update every 2 weeks, Voice Reader every 6 days. The most recent releases landed on October 3, 2026 and October 25, 2026 respectively.
| Parameter | P51 | Voice Reader |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 weeks | Every 6 days — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 11.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 45 MB | 11 MB |
| Age rating | 17+ | 4+ |
| Developer | SPOTTERON Gmbh | Toshiki Shibata |
In-app purchases
P51
No in-app purchases
Voice Reader
- Quick Support$0.99
- Supportive Tip$2.99
- Generous Tip$5.99









