Boom.API vs Rock Nerd
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Boom.API
This app predicts if you'll hear a sonic boom from returning rocket boosters. It tracks launches, calculates blast zones, and sends personalized notifications so you know when to step outside.
- Tracks upcoming rocket launches
- Calculates sonic boom blast zones
- Interactive flight path map
- Personalized location-based predictions
- Customizable launch countdowns
- Push notifications for launches and reschedules
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Boom tells you what weather apps don't: whether you'll actually hear a sonic boom from a returning rocket booster. When a booster does a Return to Launch Site (RTLS) landing, it hits the ground with a boom that carries for miles. Boom figures out who's in the blast zone and warns you before it happens. WHAT BOOM DOES • Tracks upcoming launches from Vandenberg SFB, Cape Canaveral, and Kennedy Space Center • Calculates whether the sonic boom will reach your location based on the booster's descent corridor • Counts down to launch so you know exactly when to step outside • Shows an interactive flight path map with the sonic boom wave corridor • Sends push notifications before launch so you don't miss it PERSONALIZED PREDICTIONS Turn on location-based predictions and Boom tells you how far you are from the boom corridor, how loud it'll be (Loud / Audible / Faint), and whether the weather will affect how far the sound carries. NOTIFICATIONS Get notified 24 hours before, 1 hour before, or right at launch, your call. You'll also get an alert if a launch reschedules within that 24-hour window. Not every launch produces a sonic boom. Boom filters out ocean landings and only shows you what's actually relevant to where you are.
Rock Nerd
Discover and identify rocks with a comprehensive map of over 2,300 locations. Track your finds, connect with other enthusiasts, and learn about geology. Premium features unlock worldwide access and advanced community tools.
- 2,300+ rockhounding locations
- Smart regional rock identification wizard
- Personalized collection tracker (My Vault)
- Rock Buddy matching for hunting partners
- Trip planner and sharing
- Community activity feed and messaging
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Rock Nerd is the field companion rockhounds, mineral collectors, and geology lovers actually use in the dirt—not another “snap a photo and hope” rock scanner. Plan where to go. Know what you might find. Log what you collect. All in one app built for real collecting trips. WHY ROCK NERD IS DIFFERENT • Map-first rockhounding — thousands of collecting spots with photos, reviews, directions, and community verification • Honest Rock ID — answer simple questions about color, hardness, and texture to narrow regional matches (no AI pretending a photo is a lab test) • Built for the field — compass, clinometer, magnetic check, return-to-car, hunt distance, and check-ins at spots • Your collection, organized — Vault logbook for specimens and finds (free tier to start; Premium for unlimited storage) • Trip planner — build multi-stop rockhounding routes and invite friends • Land context on the map — BLM, national forest, geology, and mineral dataset layers to hunt with more confidence • Community — share finds, follow collectors, forums, and spot voting that helps keep pin data trustworthy MAP & COLLECTING SPOTS Browse curated and community spots on an interactive map. Filter by spot type, read reviews, see photos from the field, get directions, and check in when you arrive. Premium unlocks nationwide browsing; free accounts can explore locally. ROCK ID WIZARD Identify rocks, minerals, and fossils common to your region using a guided question flow—not a black-box photo guesser. Pick your area, answer a few field observations, and see ranked matches with photos and learn-more links. New cinematic reveal results make identification feel as satisfying as the hunt itself. FIELD TOOLS Compass, clinometer, altitude, magnetic streak check, return navigation to your car, and live hunt sharing with friends. Tools designed for boots-on-the-ground collecting, not couch browsing. VAULT & TRIPS Keep a personal catalog of your finds. Plan trips with multiple stops, packing lists, and invites. Link field work to your collection over time. MINDAT & LOCAL GEOLOGY Spot cards and Add Spot now surface nearby Mindat locality context so you can connect field finds to real mineral occurrences in your area. COMMUNITY & SOCIAL Following feed, friends, bucket list, Rock Buddy matching (Premium), messages, and state forums—connect with people who share your obsession. FREE TO START. PREMIUM WHEN YOU’RE READY. Download free and explore the map, try Rock ID, and use core field tools. Premium adds nationwide map access, unlimited Vault storage, Rock Buddy, unlimited trips, and more—with monthly, yearly, and lifetime options. No hidden tiers; cancel anytime in your App Store settings. WHO IT’S FOR • Rockhounds and mineral collectors • Crystal and fossil hunters • Geology students and hobbyists • Families exploring nature together • Anyone tired of identifier apps that guess wrong Rock Nerd is made by collectors, for collectors. Hunt with a plan—not a guess. Questions or support: visit rocknerd.app or simply use the report bugs or suggestions button in the profile section. Privacy policy: rocknerd.app/privacy.html Terms of use - https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is review sentiment: Boom.API at 100% against Rock Nerd's 50%. Boom.API also leads on in-app purchases (none vs 3) and rating (5.0 vs 4.7). Rock Nerd's advantage is ratings volume (6 vs 2). On price, update cadence, ads 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. Rock Nerd sells 3 in-app purchases, starting at $3.99 per month. Boom.API asks for nothing beyond the download.
Boom.API holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 2 and 6 respectively. Written reviews point the same way: 100% of Boom.API's written reviews are positive against 50% of Rock Nerd's.
Boom.API ships an update every 5 days, Rock Nerd every 9 days. The most recent releases landed on October 15, 2026 and October 17, 2026 respectively.
| Parameter | Boom.API | Rock Nerd |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | 4.7 (6 ratings) |
| Positive reviews | 100.0% of reviews — better | 50.0% of reviews |
| Number of ratings | 2 | 6 — better |
| Update frequency | Every 5 days — better | Every 9 days |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.1 | 15.1 |
| Further details — not scored | ||
| Size | 43 MB | 107 MB |
| Age rating | 4+ | 9+ |
| Developer | Nikolai Cook | Terry Brazil |
Customer experience
Boom.API
Rock Nerd
In-app purchases
Boom.API
No in-app purchases
Rock Nerd
- Rock Nerd Monthly Subscription$3.991 Month
- Rock Nerd Yearly Subscription7 Days trial$39.991 Year
- Rock Nerd Lifetime Premium$99.99









