
BlubHub – Aquarium tracker
Water values, trends & care
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Free
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About
BlubHub is the logbook for your aquarium. Track your water values, see at a glance whether everything is in balance, and get nudged before something becomes a problem. For saltwater and freshwater tanks alike.
WATER VALUES & TRENDS
• 19 parameters: pH, alkalinity, calcium, magnesium, nitrate, phosphate, salinity, temperature and more
• Test sessions with a timer per test — run several measurements at once
• A running test timer stays in view on your lock screen, and you get a nudge when it runs out
• Charts and history per value, with target bands per tank
• Custom safe bands per tank: a reef makes different demands than an Amazon biotope
• Instantly see what is drifting and in which direction
CARE ON A RHYTHM
• Reminders for water changes, testing, dosing, feeding and filter maintenance
• See what is due today, what is coming up and what is overdue
• Home-screen widgets: balance, water values and your next task, which you can tick off right there
• Notes per tank, so your logbook is actually complete
PHOTOS & TIMELINE
• A timeline per tank: readings, notes and photos, moment by moment
• A built-in tank camera for photos and short videos. Where your device allows it, it corrects the colors for your aquarium lighting
• A timeline of its own for every inhabitant, from the day you bought it
YOUR AQUARIUM, COMPLETE
• Inhabitants with species, count and photos, from a catalog of 600+ fish, corals, invertebrates and plants, each with an illustration and care notes
• Tankmate matrix and suggestion wizard: see which species get along
• Equipment overview: filter, lighting, heater, wavemakers
• Multiple tanks side by side, salt and fresh mixed freely
PRIVACY FIRST
• Everything lives locally on your device — no account required
• No ads, no tracking, no third-party analytics
• Optional: back up your logbook online, share a tank with housemates or show it on a public page — you choose what gets synced
BlubHub is available in English, Dutch, German, French, Italian and Spanish.
Privacy policy: https://blubhub.ohhi.nl/privacy
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What's New in BlubHub
1.0.3
October 18, 2026
New for saltwater tanks: nutrient balance. Under your water values you see the ratio of nitrate to phosphate, and what an imbalance means for corals and algae. Tick off a reminder straight from its notification, also on your watch. Shoot sideways with the tank camera and the photo now turns with it and fills the frame. If sharing fails, you now see why. A shared inhabitant photo now shows its species, with species info. An inhabitant photo you deleted online can be shared again.
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