Boom.API vs Cramology
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.
Cramology
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Cramology is a focused medical study companion designed for students preparing for demanding exams. Explore structured lecture content, practise with question banks, review clinical heart and lung sounds, track your study progress, and keep your revision organised in one calm workspace. Key features: • Structured medical lectures and focused Cramming summaries • Question bank practice and review • Clinical heart and lung sound library • Reading progress, saved position, highlights, and study tools • Guest access with optional account creation for saved progress • Self-service account deletion inside the app Cramology is intended for education and exam preparation only. It does not provide medical advice, diagnosis, or treatment, and it is not a substitute for qualified clinical supervision or authoritative medical sources.
Screenshots
Verdict
The clearest difference is update cadence: Boom.API at every 5 days against Cramology's every 9 days. On price, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Boom.API ships an update every 5 days, Cramology every 9 days. The most recent releases landed on October 15, 2026 and October 8, 2026 respectively.
| Parameter | Boom.API | Cramology |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 5 days — better | Every 9 days |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.1 | 15.0 — better |
| Further details — not scored | ||
| Size | 43 MB | 75 MB |
| Age rating | 4+ | 17+ |
| Developer | Nikolai Cook | Jaafar alsadeq Zamili |
In-app purchases
Boom.API
No in-app purchases
Cramology
No in-app purchases









