SEASLUG.WORLD
by NOBUHIKO KIMOTO
- Education
- Free
- Rating
- 0.0
- 0 ratings
- Top 8%among 38 Education apps
- Last update
- Oct 9, 2026
- Version 1.4.0
- Size
- 17 MB
- Category
- Education
- Tracked since
- Oct 24, 2026
Estimated revenue
A model estimate with a likely range, not a reported figure.
No estimate. Apps outside the grossing charts, and some countries, have no reliable rank-to-revenue curve, so we show nothing rather than a guess.
How this estimate is made
Rank: we take the app's best Top Grossing rank on the latest chart day. Category ranks are converted into an equivalent overall rank, because a #10 in Finance earns far less than a #10 overall.
Curve: that equivalent rank is read off a rank-to-revenue curve anchored on public company revenue and market-data reports for the US iPhone App Store.
Country: the curve is scaled per country (Japan is roughly a third of the US, Türkiye under 1%). Where we have no scale, such as China, there is no estimate.
Range: the likely range widens with country, category and chart depth. It is a plausible span, not a statistical confidence interval.
Not included: ads, payments outside the App Store, and any difference between gross sales and what the developer keeps. Low confidence means indirect data; medium means several independent sources agree.
Full methodScreenshots
As shown on the App Store listing.
About this app
Text from the App Store listing.
Found a sea slug on a dive and came home without knowing what it was?
Sea Slugs of the World is the official app of seaslug.world, a community-built field guide grown from the contributions of 630 divers, snorkelers and researchers. It covers more than 2,200 species and over 50,000 photographs.
■ A guide you search by sight
Search by scientific or Japanese common name, or narrow down by colour, the region where it was observed, and taxonomy (family and genus). Even when you have no name to go on, you can get there from what the animal looked like.
■ AI identification
Pick a photo and the AI proposes candidate species with similarity scores. Straight after the dive, while it is still fresh. Tap a candidate to open its full entry in the guide.
■ Works offline
Save the guide data and cover photographs to your device and it keeps working on the dive boat, on a remote island, in airplane mode.
■ Updated daily
New species descriptions, digests of recent papers, and photographs the community posted today.
Premium membership (JPY 500 / month, auto-renewing)
- Save the entire guide offline
- Unlimited AI identification (the free tier has a usage limit)
- Unlimited access to members-only articles
- No ads
Payment is charged to your Apple Account. The subscription renews automatically unless it is cancelled at least 24 hours before the end of the period. Manage or cancel it in iOS Settings > Apple Account > Subscriptions.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://seaslug.world/blog/privacypolicy
What’s new
Release notes for the latest version, as written by the developer.
New: Sea slugs near you — see the species photographed at nearby dive sites, sorted by how often they are seen this season. Works on boats and islands without signal, and your location never leaves your device.
Rank history
Daily position in the Palau charts. #1 is at the top.
- Best rank
- #3
- Current rank
- #8
- Days charting
- 2 of 7
On the charts today
Small & simple score
How realistic it is for a small team to build something like this.
78/100
Not flagged as small & simple
- Developer size100% · 25
Developer: 1 app on the charts
- Audience size– · 20
No data, weight redistributed
- App size100% · 10
Size: 17 MB
- Price model80% · 15
Price model: free with in-app purchases
- Demand proof50% · 30
Best rank #3, 1 country
An indicator, not a fact. We can't see team size. Calculated Oct 25, 2026 · method i2
How the score worksVersion history
- 1.4.0LatestReleased Oct 9, 2026