Smart Logbook for Aquarists

Take control of your water parameters. Log tests, spot trends, and keep every tank thriving.
Whether you're maintaining a reef, planted tank, or any other aquarium setup, Reef Book adapts to your needs. Create dedicated logbooks for each aquarium and track year-over-year progress. With beautiful trend graphs, customizable parameters, and seamless iCloud sync across all your devices, managing multiple tanks has never been easier.

Track What Matters

• Log any parameter with our smooth, intuitive interface
• Customize ranges and units for your specific setup
• Mark favorites for quick access to critical measurements
• Support for unlimited tanks

See the Big Picture

• Trend charts reveal patterns at a glance
• Full-screen tank backgrounds for instant recognition
• Long-term tracking across multiple logbooks
• Notes and smart tags to track maintenance, dosing, and tank events

Always in Sync

• Automatic iCloud backup protects your data
• Access your logs from any device
• No account or setup required

Plus fun iMessage stickers!