The Best Pool Maintenance Apps, Compared

Full disclosure up front: Skimmer is a pool maintenance app, and it's included here. That said, this roundup is meant to be genuinely useful, not a thinly disguised ad. Pool apps split into a few very different categories that get lumped together in app store searches, and knowing which category you actually need is more useful than any single "best" pick.

What actually matters in a pool app

Before comparing specific apps, it helps to know what you're comparing them on. Most "pool app" searches turn up tools built for very different jobs.

• One-time calculator vs. running log: does the app just tell you how much chlorine to add right now, or does it keep a history of every test and dose over time?
• Equipment tracking: does it remember when your pump, filter, or heater was installed and serviced, or is it chemistry-only?
• Who's behind it: is this an independent tracking tool, or a free app from a chemical or test-strip brand whose real business is selling you products?
• Offline and account-free: does it work without creating an account or depending on a company's servers staying online?
• Resale value: if you sell the house, does the app produce something you can actually hand a buyer, or is the history stuck in an app they'll never install?

Pool Math: the calculator the forums trust

Pool Math is the app most frequently recommended in Trouble Free Pool and similar communities, and for good reason: its dosing calculator is solid and it's been around for years. It's priced at roughly $7.99/yr on its current App Store listing, though vendor pricing can drift, so confirm the current number before buying. The tradeoff is scope. Pool Math is built around a single reading at a time, not an ongoing log. It will tell you how much chlorine to add today, but it won't show you a chart of your pH over the last three months, and it doesn't track equipment at all.

Pooli: a premium platform at a premium price

Pooli positions itself as a full-service pool app, with pricing around $109/yr per its published rates (again, confirm the current price directly with the vendor). That's a real jump from most of the other apps on this list, and it appears to require an account rather than working as a standalone offline tool. Whether that's worth it depends on what you're actually using: if the extras beyond basic chemistry and dosing logs matter to you, the price may be justified. For straightforward water testing and record-keeping, it's a lot to pay relative to what else is available.

Orenda and AquaChek: free apps with a catch

Orenda and AquaChek Connect are both free, and both come from companies that sell pool products, chemicals for Orenda, test strips and chemicals for AquaChek. That's not a knock on either app, but it's worth understanding why they're free: they exist in part to support product sales, not as neutral tracking tools. Orenda's dosing guidance leans toward Orenda-branded chemistry. Some past versions of AquaChek Connect were built around a proprietary smart-strip reader accessory that has since been discontinued, which is a useful reminder that a "free" app can still carry hardware dependency risk. Neither app is centered on equipment tracking or a resale-ready export; both are focused on water testing tied to their own product lines.

Sutro and pHin: the smart-monitor cautionary tale

Sutro and pHin both sold floating water-testing sensors paired with a subscription that delivered automated chemistry readings. Both were discontinued, Sutro in 2025 per public reports, leaving owners with hardware that stopped functioning once the backend service that powered it went offline. That's the structural risk of any smart monitor: the sensor is only as useful as the company's servers staying on. If you're considering a similar device today, it's worth asking what happens to your data and your hardware if the company shuts the service down. Manual testing paired with a logging app doesn't have that failure mode, there's no backend to lose.

Where Skimmer fits

Skimmer is built as a running log rather than a single-reading calculator: water tests, chemical doses, and maintenance tasks all live in one history, alongside equipment lifecycle tracking for your pump, filter, and heater. It exports a resale-grade PDF service-history report, which none of the apps above are built to produce. It's $19.99/yr with a 7-day free trial, works fully offline, and never requires an account, so there's no backend to depend on. It's priced above Pool Math and below Pooli, and it isn't tied to selling you a specific chemical brand the way Orenda and AquaChek are.

How to actually choose

If you just want to know how much chlorine or pH-down to add right now and nothing else, Pool Math covers that well for a low annual price. If you're already buying a specific brand's chemicals or strips and don't mind the brand tie-in, Orenda or AquaChek's free apps can work fine. If you're weighing a smart sensor, go in aware that hardware-plus-subscription products have a real shutdown risk, as Sutro and pHin owners learned. And if what you actually want is a running record of your pool, chemistry, dosing, equipment, and something you can hand a buyer someday, that's the gap Skimmer and, to a lesser extent, a well-maintained spreadsheet are built to fill. Most people who try to build that spreadsheet stop updating it within a season; that's the practical case for a purpose-built app over a blank grid.