Precision aquarium monitoring · Beta

Your tank,
understood.

ATSMonitor is a scientific monitoring platform for planted tank hobbyists. Log parameters, calculate dissolved CO₂, track trends over time, and get AI-powered insights — free to use.

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Built for precision

Everything you need to
understand your water.

From daily parameter logging to long-term trend analysis, ATSMonitor gives you the tools to make informed decisions about your aquarium — backed by your own data.

10 tracked parameters
pH, temperature, ammonia, nitrite, nitrate, CO₂, KH, GH, TDS, and phosphate — with custom target ranges and min/max bounds per tank.
Trend charts & parameter overview
Visualize every parameter over time. A normalized correlation chart lets you compare all parameters together and spot relationships at a glance.
CO₂ estimation
Calculates dissolved CO₂ from your KH and mid-photoperiod pH using the standard carbonate equilibrium formula. Shows pH swing between sessions.
AI-powered insights
Powered by Claude. Analyzes your full parameter history, tank profile, and CO₂ estimates to surface specific, actionable recommendations.
Session-tagged logging
Tag readings as pre-CO₂ or mid-photoperiod. Both render as distinct lines on pH charts so your daily pH swing is always visible.
Notes & chart annotations
Add a session note to any reading. Notes appear as amber markers on trend charts so you can correlate parameter changes with the actions that caused them.
Edit & correct readings
Fix logging mistakes without losing your history. Edit any previous reading — update values, change the session tag, or correct the timestamp.
Works on any device
Fully responsive — log from your phone while standing at the tank. Your data syncs instantly across all devices through secure cloud storage.
Export & import
Your data is always yours. Export a complete JSON backup at any time — tank profile, ranges, and full reading history — and restore it on any device.
What you track

Every parameter that matters.

Built specifically for planted aquariums with CO₂ injection. Default ranges are pre-configured for high-tech setups and fully adjustable per tank.

pH—6.4 – 7.2
Temperature°F74 – 80
Ammoniappm0 – 0.25
Nitriteppm0 – 0.1
Nitrateppm0 – 20
CO₂ (calculated)ppm20 – 35
KHdKH2 – 5
GHdGH4 – 10
TDSppm100 – 250
Phosphateppm0.1 – 1.5
CO₂ estimate
28.4ppm
target 28 ppm · range 20–35
20▲ 28 target35
optimal
Derived from
Mid-photo pH
6.9
×
KH
3.5 dKH
→
Est. CO₂
28.4
3 × KH × 10^(7 − pH)
Who it's for

Built for the data-driven hobbyist.

01
High-tech planted tank

The precision hobbyist

You're running CO₂ injection, dialing in KH buffering, and watching nitrate creep. You want to correlate your bubble rate with dissolved CO₂ over time — not guess at it.

  • Track pre-CO₂ and mid-photoperiod pH as separate trend lines
  • See calculated dissolved CO₂ from your own KH and pH readings
  • Add notes to readings — changes appear as markers on charts
  • Get AI analysis specific to your fish, plants, and substrate
Free · 1 tank · Available now
02
Professional maintenance

The maintenance technician

You manage tanks for multiple clients. You need consistent records, historical context per tank, and a tool that keeps up with your workflow in the field.

  • Full tank profiles with equipment, livestock, and maintenance records
  • Per-tank parameter history and trend analysis
  • Export client data as structured JSON for records or handoffs
  • AI insights tailored to each individual tank setup
Pro tier · coming soon
AI insights

A specialist in
your corner.

ATSMonitor uses Claude (Anthropic's AI) to analyze your full parameter history alongside your tank profile — fish, plants, substrate, fertilization routine, and CO₂ system — to surface insights a generic app can't.

It understands the difference between a pre-CO₂ pH and a mid-photoperiod reading. It knows what KH of 7 means for hitting 28 ppm CO₂. It gives you a real analysis, not boilerplate advice.

Bring your own Anthropic API key — a typical analysis costs a fraction of a cent.

AI Insights Powered by Claude
Tank chemistry is stable overall. CO₂ is dialed in — pH swing indicates consistent injection. Nitrate trending upward; water change recommended within 2–3 days.
Dissolved CO₂ at 28.4 ppm — optimal for monte carlo and anubias. pH swing of 0.9 indicates consistent injection timing.
Nitrate risen from 8 → 16 ppm over 6 days. Consider a 30% water change before next fertilizer dose.
KH holding at 3.5 dKH — good buffering capacity for your CO₂ target. No adjustment needed.
Temperature 0.8°F above target — may increase plant metabolism slightly. Monitor if climbing further.
Pricing

Free to start.
Pro when you're ready.

ATSMonitor is completely free for hobbyists with a single tank. A Pro tier for multi-tank management and professional use is in development.

Hobbyist — free
$0 / forever

Everything you need to monitor one planted tank with precision. No credit card, no trial period.

  • 1 tank
  • All 10 parameters with custom target ranges
  • Trend charts & parameter correlation overview
  • CO₂ estimation with pH swing tracking
  • Session tagging (pre-CO₂ / mid-photoperiod)
  • Reading notes with chart annotations
  • Edit & correct previous readings
  • AI insights (bring your own Anthropic API key)
  • Full log history with export & import
  • Cloud sync — access from any device
  • Mobile responsive
Get started free →
Pro — coming soon
TBD

For maintenance technicians and hobbyists managing multiple tanks. Waitlist opening soon.

  • Everything in free
  • Unlimited tanks
  • Parameter alert notifications
  • Dosing calculator
  • Water change planner
  • Historical period comparison
  • Client roster & tank management
  • Client-ready PDF reports
  • Bulk parameter entry
  • Desktop app (planned)
  • Saltwater / reef support (planned)

Ready to know your
tank precisely?

ATSMonitor is free to use. Create an account, set up your tank, and log your first reading in under two minutes.

Open ATSMonitor →
Free · Cloud sync · Works on any device · Export anytime