Onga9 vs Song Bottle
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Onga9
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Never forget the music you've heard. Onga9 is an app for logging the albums you listen to. Add a 5-star rating and a short note, and you can look back later at what you listened to this year and which albums you loved. Log - Search for albums, rate them on a 5-star scale, and write notes - Keep "Listened" and "Want to Listen" shelves, with the date you listened - See albums you recently played on Apple Music as suggestions to log Look back - See how many albums you listened to, rated, and commented on this year - Insights show your average rating, top genres, and monthly trends - Monthly listening recaps - Share "My Essential 9" as a single image Discover - Today's 3 Picks, refreshed daily and available as a Home Screen widget - Release Calendar: browse upcoming releases by month or week - This week's new releases and the weekly chart - Read comments from other music fans and follow people you like Use the same account on the Onga9 website (onga9.jp) to see your log on your computer too.
Song Bottle
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Song Bottle Pick one of your favorite songs and send it out to sea—then receive a song from someone somewhere in the world. Song Bottle is a new kind of music exchange app that connects you with strangers through music. ■ How to use Paste the URL of your favorite song Choose a mood tag that fits the song (“night,” “rain,” “walk,” etc.) Send the bottle out to sea That’s it. Someone will pick up your bottle, and in return, their song will be delivered to you. ■ Supported services Supports URLs from YouTube Music, YouTube, Spotify, Apple Music, and SoundCloud. You can share songs directly from the music services you already use. ■ “Drift” mode In addition to instant matching (“Send Now”), you can let your bottle drift at sea with delayed matching. Send a song in the morning and receive one at night, or send one before bed and get one the next day—turn music exchange into a daily habit. You’ll be notified via push notification when it arrives. ■ Mood tags Express the vibe of your song using mood tags. ■ Short message feature Attach a short message (up to 20 characters) to your song. For example: “Listen at night” or “This will cheer you up!” ■ Exchange history Review past exchanges in the app. Look back at songs you sent and received, and enjoy discovering new music. ■ Multilingual support Available in Japanese, English, Korean, Simplified Chinese, and Traditional Chinese. Exchange music with users around the world. ■ Recommended for People who want to discover new music People who want to recommend songs to others People who want a small daily joy ■ Completely free Song Bottle is free to use. No account registration required. Why not send your bottle out to sea today?
Screenshots
Verdict
The clearest difference is ads: Onga9 at none against Song Bottle's shown. Song Bottle's advantage is iOS requirement (15.1 vs 17.0). On price, update cadence, 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.
Both ship on a similar rhythm, roughly every 3 days. The most recent releases landed on October 14, 2026 and October 13, 2026 respectively.
| Parameter | Onga9 | Song Bottle |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 days | Every 3 days |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 17.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 14 MB | 48 MB |
| Age rating | 4+ | 12+ |
| Developer | Kenta Terunuma | Mitsuru Inada |
In-app purchases
Onga9
No in-app purchases
Song Bottle
No in-app purchases









