Water Test Calculator pricing: free tier + three premium options
Free with ads. Premium from $6.99/week or $79.99/year. Lifetime for $299.99. Here’s what’s in each tier and which one’s right for you.
Last updated: 2 June 2026
Water Test Calculator has four pricing tiers: a free tier with ads, two subscription tiers (weekly and annual), and a one-time lifetime payment option. This page breaks down what’s in each, free trial periods, and how to choose the right tier for your usage.
Tier overview
| Tier | Price | Free trial | Best for |
|---|---|---|---|
| Free | $0 | , | Casual pool owners, single pool |
| Weekly | $6.99/week | 3 days | Pool-shocking emergency, short-term need |
| Annual | $79.99/year | 7 days | Most users, equivalent to $1.54/week |
| Lifetime | $299.99 one-time | , | Long-term ownership, multi-pool households |
What’s in the free tier
The free tier is genuinely useful, not a “trial that doesn’t really work” tier.
- All core testing features, chlorine pool, saltwater pool, spa profiles.
- Guided + Basic testing modes for each pool type.
- Volume calculator for all four pool shapes.
- Shock calculator with CYA-adjusted targeting.
- Chemical dosing for all common pool chemicals.
- Volume memory, enter pool size once, used forever.
- Unit conversion (metric/imperial).
- Last 7 days of test history.
- Ad-supported, banner ads on home screen, interstitial after every 3rd calculation in Guided Mode and every calculation in Basic Mode.
Limitations: limited test history (7 days only), no smart notifications, ads.
What premium adds
| Feature | Free | Premium |
|---|---|---|
| Test history | 7 days | Unlimited |
| Smart notifications | , | Yes (wait times, re-test prompts) |
| Trend analysis | , | Yes |
| Ads | Yes | None |
| Multiple pool profiles | Limited | Unlimited |
| Custom alert thresholds | , | Yes |
| Export data (post-v1.1) | , | Yes |
| Priority support | , | Yes |
Free trial periods
Both subscription tiers include a free trial period, no charge during the trial, cancellable at any time before trial ends:
- Weekly tier: 3-day free trial. Trial converts to paid after day 3 unless cancelled.
- Annual tier: 7-day free trial. Best value, full week of premium during your normal pool maintenance routine.
- Lifetime tier: no trial (one-time payment, no recurring).
Which tier should you choose?
Choose Free if
- You have a single pool with stable chemistry.
- You don’t mind ads.
- You only need calculations occasionally.
- You’re trying the app before committing.
Choose Weekly if
- You’re recovering from an algae bloom or chemistry disaster and want premium for the recovery period.
- You’re opening or closing the pool seasonally and want premium for that month.
- You want to extensively test premium before annual commitment.
Choose Annual ($79.99) if
- You maintain your own pool throughout the year.
- You have multiple pools/spas to track separately.
- You want notifications and trend analysis.
- The math: $79.99 ÷ 52 weeks = $1.54/week, significantly cheaper than weekly.
Choose Lifetime ($299.99) if
- You’re committing to the app for 4+ years (lifetime pays back vs annual at ~3.75 years).
- You have a pool you’ll own long-term.
- You prefer one-time payments over subscriptions.
- The math: $299.99 ÷ 10 years = $30/year, significantly cheaper than annual over time.
The break-even math
| Holding period | Annual cost | Lifetime cost | Better choice |
|---|---|---|---|
| 1 year | $79.99 | $299.99 | Annual |
| 3 years | $239.97 | $299.99 | Annual (marginal) |
| 4 years | $319.96 | $299.99 | Lifetime |
| 5 years | $399.95 | $299.99 | Lifetime |
| 10 years | $799.90 | $299.99 | Lifetime |
The break-even point between annual and lifetime is roughly 3.75 years. If you’re going to own and maintain a pool for 4+ years, the lifetime tier is the better economic choice.
Family / household sharing
App Store and Google Play family sharing applies to Water Test Calculator subscriptions, including the lifetime tier. One purchase can be shared across an Apple Family Sharing group or Google Family group, useful if pool maintenance is split across spouses, adult children, or in-laws.
Refund policy
Subscription cancellations are handled via the App Store / Play Store account settings, Water Test Calculator doesn’t process refunds directly. Lifetime purchases follow Apple/Google’s standard 14-day refund window.
Sources & references
- Apple App Store, Subscription policies
- Google Play, In-app purchase policies
- RevenueCat, Subscription infrastructure
Frequently asked questions
Is Water Test Calculator free?
Yes, there’s a genuinely useful free tier with all core testing features, calculators, dosing recommendations, and 7 days of test history. It’s ad-supported. Premium tiers ($6.99/week, $79.99/year, $299.99 lifetime) add unlimited history, notifications, ad-free experience, and multi-pool profiles.
What’s the difference between the free and premium tiers?
Free tier has 7 days of test history, ads, and limited profile differentiation. Premium has unlimited test history, no ads, smart notifications for wait times, trend analysis, and unlimited multi-pool profiles. Same chemistry math in both.
How much is the Water Test Calculator annual subscription?
$79.99 per year with a 7-day free trial. Works out to $1.54/week if you use the app weekly. Best value option for most users.
Is the lifetime tier worth it?
If you’ll use the app for 4+ years, yes, lifetime ($299.99) breaks even with annual at about 3.75 years. Most pool owners maintain their pool for 10+ years, making lifetime significantly cheaper over time.
When does Water Test Calculator launch?
Approximately 10 days from publication of this page. iOS App Store and Google Play. Subscribe to the launch list to be notified.
Get the launch alert + free checklist
Water Test Calculator launches on iOS and Android in ~10 days. Free with ads. Premium unlocks unlimited history, smart notifications, and ad-free testing.