Real captures of the live app. Nothing here is a mockup.
- Instant download
- No internet required
- Works on any device
- Yours to keep
The Hydro Reservoir Manager
Mix it right, read it right, change it on time: every reservoir kept in range.
- Instant download
- No internet required
- Works on any device
- Yours to keep
Not sure yet? Try the free demo →
Secure checkout by PayPal or Dodo Payments. No refunds for a change of mind.
Exact doses
Each part of your nutrient, by reservoir size and stage.
Kept in range
EC and pH targets, and what to do when a reading is off.
Works offline
Use it by the tank. Nothing is uploaded or stored online.
One-time purchase
No subscriptions. No recurring fees.
About this manager
The Hydro Reservoir Manager works out the exact dose of each part of your nutrient for your reservoir's size and your crops' growth stage, then keeps it in range: log your EC or ppm and pH, and it tells you what to do when a reading is off.
It reminds you when to check and when to do a full change. It's a single HTML file you own: no subscription, no account, and it works offline.
What it does
- Exact doses for each part of your nutrient by reservoir size and growth stage
- EC targets for your crops and the extension pH band (5.5 to 6.5), including the shared range for mixed reservoirs (and a warning when there isn't one)
- Log EC or ppm and pH, with what to do when a reading is off
- Trend lines
- Check and full-change reminders
- Works offline; your data stays on your device
What's included
- 1 offline HTML file you keep
- Installable copy for your phone
- Calendar file with reminders
- Backup and restore to a file
- Lifetime access to this version
File type
Single HTML file
Works on
Windows, Mac, iPhone, Android
iPad, tablets
Delivery
Instant download after purchase
No shipping required
Frequently asked questions
Can I try it before I buy? +
Yes. The free demo is the real app, not a video or a mockup. It's capped to 1 reservoir, and nothing you enter is saved: closing the tab clears it. Calendar downloads, backups and printing are in the full version. Buy to remove the cap and keep what you build.
Does it work with my nutrient? +
Yes. You type in the dose from your nutrient's label (one, two or three parts), and it scales it to your reservoir and growth stage.
Is this a subscription? +
$12.00, once. No account is created, so there is nothing to cancel, and no recurring charge, ever.
What exactly do I get? +
Two things from the same purchase: a single HTML file you download and own, and an installable copy of the same app for your phone's home screen. Either one works fully offline after the first load. The download link is on the page you land on after paying, and in your receipt email.
Does it work without internet? +
Yes, after the first load. Everything works with no connection: there's nothing on the other end for it to talk to.
Where does my data go? +
Nowhere. It stays on your device, in the browser you use the app in. HarvestMath doesn't run a server that sees it. To move to another phone or computer, save a backup file from the More tab and restore it there.
What about HarvestMath Garden? +
HarvestMath Garden plans your whole garden in one place, and Garden buyers get this app too, plus 4 more apps. Pick it above the payment buttons to buy it instead, for $49. Already bought this app? What you paid counts toward it: the Garden costs you $37 (never less than $30), and your receipt email has an upgrade link with your order filled in.
Is there a refund? +
No refunds for a change of mind: the free demo is the real app (just capped, and it doesn't save), so you can see exactly how it works before you pay. If something is broken, or you were charged by mistake, email hello@harvestmath.com and we'll make it right.