RepeaterBook vs Probiotic Search
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RepeaterBook
This app provides a comprehensive, offline directory of amateur radio repeaters worldwide. It allows for fast and flexible searching, filtering, and sorting of repeater details based on various criteria, including location and call sign. Users can also easily submit updates to the community database.
- Offline repeater directory
- Comprehensive search and filtering
- Location-based repeater details
- Submit updates to database
- Portrait and landscape views
- Search history
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RepeaterBook Amateur Radio's most comprehensive, worldwide, FREE repeater directory. Powered by the popular community database of RepeaterBook.com Easily find repeaters across the world. • No network connection required. • Comprehensive search, selection and sorting. • Displays distance, heading and full repeater details. • Fast and flexible, to help you use repeaters. • Portrait or Landscape views for phone and tablets. • Easily submit updates/additions. Repeater List View Distance, bearing and details of the nearby repeaters. Current Locator/Grid/Lat Long/Town. Portrait or Landscape views for phone and tablets. Repeater Detail View Distance, bearing and details of the repeater. Portrait or Landscape views for phone and tablets. Submit an update if needed! Search No internet needed, fast and reliable. Results from your current or searched location. Results generated as you type. Search By • Town (Greater than 5k population) - portland • Town State - portland tn • USA ZIP Code - 90210 • Repeater Call - GB7SV • Repeater Frequency - 433.325 • Locator - Enter a 4 or 6 figure locator in search box and press search • Latitude Longitude - Enter Latitude Longitude (Locale specific decimal point) in search box and press search • Wildcard - * for "wildcard matches" *ford matches Bedford, Hertford Search Results • Selecting a town changes your location to show Repeaters near that town. • Selecting a repeater displays all the info on the repeater. Search History • 10 search examples are provided. • The last 10 searches are saved. Filter Distance Band Service Sort by Distance Frequency Band Tone Call Service Bearing Country Settings Location titles Locator (IO91VW) Lat Lon (52.6579 1.7160) Text (East) Short Text (E) Degrees (90°) Theme Light or Dark Distance Units (Miles or km) Menu App name version and build Current location and name Settings About Add repeater Feedback via Email Privacy Policy Supported Languages ca, cs_CZ da,de en, en_GB, en_US, en_AU, en_IE, en_ZA, en_NZ es, es_AR, es_CL fi, fr, fr_CA it_IT nb, no, nl pl, pt se, sv, sk RepeaterBook will always be free. 73 Garrett KD6KPC and Nicolas M1HOG Copyright 2011-2026 RepeaterBook.com & ZBM2.com Terms of Use (EULA):https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Probiotic Search
Explore scientific literature on probiotics with this tool. It instantly queries PubMed based on your health topic, displaying study counts for specific probiotic genera and species. The app offers a clean interface to help you understand research findings directly from PubMed.
- Search PubMed by health topic
- View probiotic study counts
- Explore research directly
- Save result sets
- Clean interface
- No sign-in required
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Probiotic Search helps you explore scientific literature on probiotics quickly and clearly. Enter any health topic and the app instantly queries PubMed to show how often specific probiotic genus and species appear in published research related to your search term. Results are presented in a simple list with study counts, letting you explore evidence directly from PubMed. Features • Provides information to help make decisions on which products you may want • Search PubMed by health topic • View probiotic genus and species study counts • Tap any result to open the corresponding PubMed search • Save result sets for later reference • Clean, distraction-free interface • No accounts or sign-in required This app does not provide medical advice, diagnosis, or treatment recommendations. It is an educational research tool designed to make scientific literature more accessible. Who it’s for • Researchers • Students • Healthcare professionals • Curious readers exploring scientific literature Data & Privacy The app does not collect personal data. Searches are sent directly to PubMed and your private backend server to retrieve public research information. Disclaimer Probiotic Search is for informational and educational purposes only. Always consult qualified professionals for medical or healthcare decisions. Developed by Mark Brudnak PhD, microbiology researcher and author.
Screenshots
Verdict
The clearest difference is price: RepeaterBook at Free against Probiotic Search's $6.99. RepeaterBook also leads on ratings volume (247 vs 1) and update cadence (every 3 weeks vs every 6 weeks). Probiotic Search's advantage is rating (5.0 vs 4.2) and in-app purchases (none vs 1). On ads, device support and iOS requirement 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
RepeaterBook is free to download; Probiotic Search costs $6.99 up front. RepeaterBook sells 1 in-app purchase, starting at $14.99 per year. Probiotic Search asks for nothing beyond the download.
Probiotic Search holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: RepeaterBook has 247 ratings behind it against 1, so its average is the more settled of the two.
RepeaterBook ships an update every 3 weeks, Probiotic Search every 6 weeks. The most recent releases landed on November 9, 2026 and November 5, 2026 respectively.
| Parameter | RepeaterBook | Probiotic Search |
|---|---|---|
| Price | Free — better | $6.99 |
| Rating | 4.2 (247 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 66.7% of reviews | — |
| Number of ratings | 247 — better | 1 |
| Update frequency | Every 3 weeks — better | Every 6 weeks |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 51 MB | 1 MB |
| Age rating | 4+ | 12+ |
| Developer | Nicolas Associates Ltd | Mark Brudnak |
Bugs and requests
RepeaterBook
Reported bugs
11 issues- Location services showing repeaters hundreds of miles away
- App not displaying any repeaters despite correct filters
- iOS version showing incorrect frequency data
- Recent update losing user data and settings
- Location feature not finding nearby repeaters
Show 6 moreShow fewer
- iPad compatibility issues with latest version
- 2-meter repeaters not showing in filtered results
- Repeater information not loading properly
- App crashes or becomes unresponsive
- Website login issues not addressed in app
- Feedback submission disabled in application
Requested features
16 requests- Map display of repeater locations
- Field name labels for repeater details
- Coverage range information for repeaters
- GMRS channel display alongside frequency
- Dark mode support
Show 11 moreShow fewer
- Ability to edit user location manually
- Link to full website listings from app
- Better DMR repeater information
- Club repeater highlighting
- APRS filter option
- Wires-X filter option
- Copy and paste functionality
- Watch interface support
- Ability to add custom repeaters
- Offline map support
- Call sign validation for international prefixes
Probiotic Search
Not enough reviews yet to summarise bugs or requests.
In-app purchases
RepeaterBook
- Unlimited Access3 Days trial$14.991 Year
Probiotic Search
No in-app purchases


