Comparison

Pool vs Life Time Left

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Pool

This app simplifies swimming pool and hot tub chemistry maintenance by performing all necessary calculations. It provides clear instructions on chemical dosages to maintain balanced, clear water, eliminating the need for complex charts and formulas.

Highlights
  • Chemical dosage calculations
  • Pool volume calculation
  • Chemical effects analysis
  • Customizable chemical ranges
  • Offline functionality
Features
Read full description

Looking for help with calculations for your swimming pool or hot tub chemistry maintenance? The Pool Calculator does all the math for you, making chemical testing and treating your pool or hot tub a breeze. Pool Calculator is easy to use, and tells you exactly how much of each chemical to add to keep your water in balance and crystal clear. No more puzzling over complicated charts and formulas. Bring your iPhone or iPad out to the pool and have all the chemical information and calculations you need right at your fingertips. Pool Calculator works offline and online, so if you have poor internet reception by your pool, you’re still able to get test results. Pool Calculator provides a complete tool kit to make pool care easy. You get: • Chemical Calculator • Pool Volume Calculator • Chemical Effects (What-if) Calculator CHEMICAL CALCULATORS You can use whichever test strip or test kit you prefer for testing your pool or hot tub. Pool Calculator provides calculations for: - Chlorine (FCl) - Raising pH - Lowering pH - Total alkalinity (TA) - Calcium hardness (CH) - Stabilizer (CYA or cyanuric acid) - Salt - Borate (Borax) - Calcium saturation index (CSI, similar to LSI) RECOMMENDED CHEMICAL RANGES- USE OURS OR DECIDE YOUR OWN With Pool Calculator, the recommended ranges for your chemicals are based upon whether you have a pool or hot tub, and the surface material (plaster, vinyl or fiberglass) of your pool or hot tub. You can choose from several pre-defined ranges or customize based on your or your pool pro’s preferences. POOL VOLUME CALCULATOR To keep your swimming pool or hot tub at its best, it’s important that you accurately calculate your water volume. All of the chemical balancing recommendations you receive from the Pool Calculator are based on it. You can calculate the volume of your pool in metric units (liters) or in imperial units (gallons). The Pool Volume Calculator can be used for: • Rectangular Pools and Hot Tubs • Oval Pools and Hot Tubs • Round Pools and Hot Tubs CHEMICAL EFFECTS CALCULATOR “What if” analysis for adding chemicals to your pool or hot tub! Ever want to know the impact of adding a given amount of Chemical has on your swimming pool or hot tub chemistry? The Chemical Effects Calculator calculates the impact adding a specific amount of chemical has on your pool chemistry. It does this not only for the primary purpose of the chemical, but also on the other important measurements for your pool. For example, adding Trichlor not only raises your Free Chlorine, it also increases your Cyanuric Acid, lowers your pH and increases your Salt. Adding Cal Hypo raises Free Chlorine, and also raises Calcium Hardness (CH) and Salt. With the Chemical Effects Calculator, you can measure the effects on pool chemistry of adding a given dose of: • Bleach • Trichlor • Dichlor • Cal-hypo • Lithium Hypochlorite • Chlorine gas • Muriatic Acid • Dry Acid • Washing soda • Soda Ash • Borax • Sodium Tetraborate Pentahydrate • Boric Acid • Caustic Acid (lye) • Baking Soda • Calcium Chloride • Calcium Chloride dihydrate • Stabilizer • Liquid Stabilizer • Salt PoolCalculator can be used for in ground or above ground pools, spas and hot tubs, chlorine or salt pools, and a broad range of surfaces. Running into problems? Let us know at support@poolcalculator.com!

About

Life Time Left

Visualize your life in weeks and cultivate mindfulness with a simple Stoic journal. Track weeks spent and remaining, and jot down quick thoughts with mood tags to foster calm and focus.

Highlights
  • Life calendar with weeks spent and left
  • Quick journal entries with mood tags
  • Pattern spotting and momentum building
  • Minimalist grid for quick glances
  • Privacy-focused with on-device data
Features
Read full description

See your life in weeks and keep a small Stoic journal to use today well. The life-calendar shows weeks spent and weeks left (and your %), while quick notes with mood tags help you stay calm, focused, and intentional. Memento vivere. What you get: • Life Calendar (4K Weeks) • Weeks spent & weeks left, plus % left for instant clarity • Clean, minimal grid you can glance at in seconds Stoic Journal: • Write a short thought, tag the mood (negative / neutral / positive) • Save the lesson, not the drama—respond instead of react • History view to spot patterns and build momentum Made for: People who want mindfulness without fluff, time management without spreadsheets, and a Stoic habit that fits into real life. Great for creators, students, founders, and anyone chasing meaningful goals. Note: Core features require a subscription. See terms and conditions for details. Support and Updates Our dedicated team regularly updates the app with new features and improvements based on user feedback. 4K Weeks app respects your privacy. Your data stays on your device and iCloud. You may purchase an auto-renewing subscription through an In-App Purchase. • Auto-renewable subscription • Your subscription will be charged to your iTunes account at confirmation of purchase and will automatically renew (at the duration selected) unless auto-renew is turned off at least 24 hours before the end of the current period. • Current subscription may not be cancelled during the active subscription period; however, you can manage your subscription and/or turn off auto-renewal by visiting your iTunes Account Settings after purchase https://4kweeksapp.wordpress.com/privacy-policy/ https://4kweeksapp.wordpress.com/terms-of-use/

Screenshots

Pool4 screens
Life Time Left4 screens

Verdict

The call

The clearest difference is review sentiment: Life Time Left at 67% against Pool's 21%. Life Time Left also leads on price (Free vs $4.99) and rating (4.6 vs 4.1). Pool's advantage is in-app purchases (none vs 3) and ratings volume (630 vs 18). On ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Life Time Left is free to download; Pool costs $4.99 up front. Life Time Left sells 3 in-app purchases, starting at $2.99 per 7 days. Pool asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Life Time Left holds the better App Store score, 4.6 against 4.1. That said, the two scores are not equally well evidenced: Pool has 630 ratings behind it against 18, so its average is the more settled of the two. Written reviews point the same way: 21% of Pool's written reviews are positive against 67% of Life Time Left's.

UpkeepUpdate frequency

Pool ships an update every 5 weeks, Life Time Left weekly. The most recent releases landed on November 7, 2026 and November 5, 2026 respectively.

Scorecard8 real differences · 2 level
Pool versus Life Time Left: the parameters behind the verdict, then further details
ParameterPoolLife Time Left
Price$4.99Free — better
Rating4.1 (630 ratings)4.6 (18 ratings) — better
Positive reviews21.0% of reviews66.7% of reviews — better
Number of ratings630 — better18
Update frequencyEvery 5 weeksWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterSubscription
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.1 — better17.4
Further details — not scored
Size17 MB43 MB
Age rating4+4+
DeveloperPool and Spa Resources, LLCEdwing H Santos Mena

Customer experience

Pool

All ratings629 ratings
Positive80.3%
Neutral5.4%
Negative14.3%
Written reviews105 reviews
Positive21.0%
Neutral20.0%
Negative59.0%

Life Time Left

All ratings18 ratings
Positive88.9%
Neutral5.6%
Negative5.6%
Written reviews3 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

Bugs and requests

Pool

Reported bugs

4 issues
  • App crashes on launch for many users
  • Keyboard issues preventing data entry
  • Incorrect chemical effect information (e.g. soda ash)
  • Volume calculation not updating properly

Requested features

4 requests
  • Ability to save and track test history
  • Support for multiple pools/spas
  • Metric-only unit support
  • More detailed chemical dosage information (e.g. weight-based)

Life Time Left

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Pool

No in-app purchases

3 purchases

Life Time Left

Subscriptions2
  • Pro$2.997 Days
  • Pro$9.991 Month
One-time1
  • Lifetime$19.99

Questions

Is Pool free?
Pool costs $4.99, with no in-app purchases.
Is Life Time Left free?
Life Time Left is free to download, with in-app purchases available.
Which has better reviews, Pool or Life Time Left?
Life Time Left is rated higher. Pool averages 4.1 out of 5 from 630 ratings, while Life Time Left averages 4.6 from 18 ratings.
Do Pool or Life Time Left have ads?
Neither Pool nor Life Time Left shows ads.
Which is updated more often, Pool or Life Time Left?
Pool ships an update every 5 weeks, and Life Time Left weekly. Most recently, Pool was updated on November 7, 2026 and Life Time Left on November 5, 2026.

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