Comparison

うみびん vs BLAB.

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

うみびん

Features
Read full description

「うみびん」は、ネットの海にボトルメールを流す、ゆるいメッセージアプリです。 誰に届くか分からない。いつ届くか分からない。海は気まぐれです。 あなたのメッセージは、どこかの誰かのもとに流れ着きます。 届いたボトルを開いて読んだら、返事を書いてもいいし、そっと海に還してもいい。 ■ 特徴 ・会員登録なし。開いたらすぐ使えます ・メッセージを書いて「放つ」だけのシンプル操作 ・1日数回、誰かのボトルメールが流れ着きます ・レアな称号やメダルを集める楽しみも ・「未来へ」で自分だけのタイムカプセルとしても使えます 個人情報の入力は不要。あなたが何を書くかだけで繋がる、ちょっと不思議なコミュニケーションです。

About

BLAB.

Features
Read full description

Say what you think. Talk with people who share your interests. BLAB. is a small social network for saying what you think and reading people who care about the same things you do: your work, your music, your films, your sport, your day. No bought followers, no ads chasing you around and no algorithm deciding what you see. TWENTY-EIGHT WORLDS Every topic has its world, with its own color and its own people: Developers, Photography, Music / DJs, Fitness, Startups, Marketing, Video games, Sports, Food, Wellbeing, Film and TV, Travel, Books and comics, Pets, Money, Design and art, AI, Work, People, Daily life, Technology, Home, Fashion and beauty, Cars and bikes, Creators, Learning, Science and Outdoors. Nothing to join: you go in, read and post wherever you like. An answer can sit in two worlds at once. POST YOUR WAY Write what's on your mind and add a photo, a GIF, a link, your location or a poll. Pick a tone if you like: Confession, Roast, Unpopular opinion, Idea or Advice. Quote any answer with your take and choose who can reply: everyone, people you follow or nobody. CHECK-IN Talking about a film, series, book, comic, game, dish, drink, album, podcast or place? Tap Check-in, find it and attach it with your stars. Its cover shows in your answer, and anyone can open it or save it in Raved. AND IF YOU DON'T KNOW WHAT TO SAY, THE DAILY CHALLENGE Every day there's one question, the same for everyone, in case you want a spark: "Confess something you do but never admit." Answer it or skip it; it's an extra, not a duty. FIVE WAYS TO REACT Like, That's me, Brutal, Useful and Saving this. Long-press to see what each one means. What you save shows up in your profile. See who reacted and how. FOLLOW WHO INTERESTS YOU The Following tab shows only the people you follow. Every Sunday, "Your week" sums up your answers, reactions, readers and new followers. And if you like a bit of competition: the ranking by world, by country or among the people you follow, and Recommendations, what people have rated and their average score. SMALL ON PURPOSE No intrusive ads and no ad tracking. Today shows what people post, newest first and your languages up front. Nothing is pushed to keep you scrolling. · Report or block anyone from any answer or comment. · Mute the words you'd rather not read. · Translate what's written in other languages with one tap. · Share any answer, or your profile, as a link, an image or an Instagram Story sticker. · Export everything you've written, or delete your account for good, from the app. · Light or dark mode, your choice. SPONSOR A CHALLENGE Brands propose a one-day challenge from Settings → Sponsor a challenge or at blab.day/sponsor, and choose where it shows: one country, up to five or worldwide. We review it, it's paid in the app and it runs for 24 hours with the logo, a link and a "Sponsored by" label. The brand gets a report with reach, answers and reactions. Never who took part. BLAB. PRO — optional Short video and polls in your answers, and a PRO badge next to your name. Pro and sponsored challenges are what pay for the servers. Everything else is free, always. BLAB. Pro is an auto-renewable subscription, monthly or yearly. Payment is charged to your App Store account at confirmation of purchase and renews automatically unless you cancel at least 24 hours before the end of the period. Manage or cancel it in your App Store account settings. Privacy: https://getblab.app/privacy Terms: https://getblab.app/terms Apple EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

うみびん4 screens
BLAB.4 screens

Verdict

The call

The clearest difference is in-app purchases: うみびん at none against BLAB.'s 5. BLAB.'s advantage is ads (none vs shown). On price, update cadence, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. BLAB. sells 5 in-app purchases, starting at $2.99 per month. うみびん asks for nothing beyond the download.

UpkeepUpdate frequency

うみびん ships an update daily, BLAB. every 2 days. The most recent releases landed on October 8, 2026 and October 31, 2026 respectively.

Scorecard2 real differences · 4 level
うみびん versus BLAB.: the parameters behind the verdict, then further details
ParameterうみびんBLAB.
PriceFreeFree
Update frequencyDaily — betterEvery 2 days
AdsYesNo — better
In-app purchasesNo — betterYes
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.6 — better18.0
Further details — not scored
Size100 MB20 MB
Age rating4+17+
DeveloperAkito IkeshitabeatLabs

In-app purchases

None

うみびん

No in-app purchases

5 purchases

BLAB.

Subscriptions2
  • BLAB. Pro Monthly$2.991 Month
  • Pro Yearly$22.991 Year
One-time3
  • Sponsored challenge$9.99
  • Sponsored day · 5 countries$19.99
  • Sponsored day · worldwide$39.99

Questions

Is うみびん free?
うみびん is free to download, with no in-app purchases.
Is BLAB. free?
BLAB. is free to download, with in-app purchases available.
Do うみびん or BLAB. have ads?
うみびん shows ads; BLAB. does not.
Which is updated more often, うみびん or BLAB.?
うみびん ships an update daily, and BLAB. every 2 days. Most recently, うみびん was updated on October 8, 2026 and BLAB. on October 31, 2026.

Other comparisons