SUIKEI - Aquarium Journal
Keep your aquarium, in photos
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Photos, care logs and water readings in one place, so you can look back on how your tank grew. One tank is free, always. Your first 45 days open every feature. No ads.
The tank you look at every day is the one whose small changes you stop noticing.
SUIKEI keeps your tank's photos, care logs and water readings together, so you can look back on how it grew.
One tank is free for as long as you like — photos, care and readings, all of it.
And for 45 days from the day you add your first tank, every Premium feature is open too.
No ads, anywhere.
■ What you can do with SUIKEI
・Log a water change or a feeding in two taps
Quick enough to do standing at the tank. "When was the last water change?" is easy to answer later.
・Look back on your tank in photos
Photos are filed by month, so plant growth, your fish, and layout changes read as a record of the tank growing.
・Fixed-point photos, the same angle every time
The previous photo is ghosted over the camera, so you shoot from the same spot at the same angle. Put past and present side by side and the small changes are obvious.
・Water readings in the units you already use
Enter them exactly as your test kit shows them. NO₃ and NO₃-N, °dH and ppm, specific gravity and salinity convert automatically, hydrometer calibration temperature included.
・No ads, even on the free plan
Not while you log, not while you look back. Time with your tank should be quiet.
■ Free, for as long as you like
・One tank
・Recording and editing photos, care logs and water readings, with no limit on how many
・Fixed-point photos
・Your oldest photo and your newest, side by side
・Time-lapse of up to 10 frames
・Export and delete your data
For 45 days from the day you add your first tank, the Premium features are open as well. After those 45 days, one tank keeps going, free.
■ SUIKEI Premium
For keeping several tanks, or following the changes more closely.
・As many tanks as you like
・Compare any two days you choose
・Time-lapse across every photo
・Several fixed points per tank — front, side, top
・Cloud backup
Monthly: JPY 480 / month
Yearly: JPY 4,800 / year (JPY 400 per month)
■ About purchases
・Payment is charged to your Apple ID.
・It renews at the same plan and price unless cancelled at least 24 hours before the period ends.
・The renewal is charged within 24 hours before the current period ends.
・Cancel from the subscription settings on your device. Cancellation is not possible from within the app.
・If you buy a paid plan during the 45-day free period, the unused part of that period ends at that point.
Privacy Policy:
https://suikei.verdolab.com/privacy
Terms of Use:
https://suikei.verdolab.com/terms
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
One tank, free for as long as you like.
This update adds a free plan, so that after the 45-day trial ends you can keep recording one tank for free.
- Recording and editing photos, care logs and water readings stays free
- Comparing your oldest photo with your newest stays free
- You can now delete photos one at a time, or a whole day at once
- Fixed dates that could show up shifted from the actual time
We hope you keep leaving your tank's changes in SUIKEI.
The developer, yutaka sugita, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Purchases
- Contact Info
- User Content
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- yutaka sugita
- Size
- 39.7 MB
- Category
- Lifestyle
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English and Japanese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- SUIKEI Premium (Monthly) $2.99
- SUIKEI Premium (Yearly) $29.99
- Copyright
- ©2026 VERDO LAB