Crystal Byte vs AnniversaryHeartLog
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Crystal Byte
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Crystal Byte is a nighttime sound recording app designed to help you review your sleeping environment. Simply start a recording before going to bed and place your phone nearby. Crystal Byte monitors ambient sound levels through your device's microphone and generates a nightly summary, sound events, a Quiet Score, and trend reports to help you better understand changes in your sleep environment. On the Home screen, you can quickly view last night's summary, including your sleep window, Quiet Score, number of sound events, and average sound level. The Reports section provides detailed sound graphs, peak noise levels, quiet periods, and review notes for each recording. In the Sound Events section, you can browse detected events such as peak noises, room sounds, and movement-related sounds, then mark important events or add personal notes. Crystal Byte also includes history and trend views, making it easy to compare the quietness of different nights, review changes in sound events, and observe bedtime patterns over time. If you create multiple recordings on the same day, the app supports side-by-side comparisons, helping you quickly identify which recording was quieter or contained more sound events. The app offers both Light and Dark themes for comfortable viewing during the day or at night. The Points Center and VIP Center allow you to unlock enhanced reports, same-day recording comparisons, and additional premium features. Core features—including nighttime recording, report viewing, history review, and trend analysis—remain simple and easy to use, making Crystal Byte a practical companion for continuously reviewing your sleeping environment. EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
AnniversaryHeartLog
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"How long has it been?" "How many days left?" HeartLog is a simple day-counter app for anniversaries and goal dates. Anniversaries with someone you love, birthdays, the day you quit smoking or drinking, a countdown to an exam or a move — HeartLog turns the dates that matter to you into something you can see at a glance. ■ Two simple ways to track ・Count up (Day 00): track how far you've come since a date — like the day you started dating, or the day you quit smoking ・Countdown (00 days left): count down to a target date — an exam, a trip, a deadline ■ Make it your own Add up to 5 photos per counter, and choose from a wide range of icons — hearts, cakes, flowers, planes, stars, and more — paired with your favorite color. Pick between two visual themes, Cute or Cool. ■ Reminders so you never miss a moment Set a reminder 1 week, 1 month, or 1 year before — or choose any number of days you like. Choose whether it repeats every year or every month, so birthdays and yearly events, or monthly reminders like rent, only need to be set up once. ■ Home screen widget See a counter's title, photo, and day count right from your home screen — no need to open the app. With multiple counters, the widget automatically sorts by the nearest date or reminder. ■ Multiple languages Available in Japanese, English, Simplified Chinese, and Traditional Chinese. Follow your device's language automatically, or choose one yourself in the app. ■ No account needed No sign-up required — your data stays on your device, so you can start right away. Whether it's memories with someone you love or goals of your own — make every day a little more special with HeartLog.
Screenshots
Verdict
The clearest difference is ads: Crystal Byte at none against AnniversaryHeartLog's shown. AnniversaryHeartLog's advantage is update cadence (every 3 days vs weekly) and device support (3 vs 1). On price and in-app purchases 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.
Crystal Byte ships an update weekly, AnniversaryHeartLog every 3 days. The most recent releases landed on October 28, 2026 and October 29, 2026 respectively.
| Parameter | Crystal Byte | AnniversaryHeartLog |
|---|---|---|
| Price | Free | Free |
| Update frequency | Weekly | Every 3 days — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 14.0 — better |
| Further details — not scored | ||
| Size | 43 MB | 29 MB |
| Age rating | 17+ | 4+ |
| Developer | Ethan John Rodriguez | KAIYOKAN, Y.K. |
In-app purchases
Crystal Byte
No in-app purchases
AnniversaryHeartLog
No in-app purchases









