Comparison

SleepTank™ vs Poolendar

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

Head to head
About

SleepTank™

Features
Read full description

SleepTank™ is a scientific approach to sleep trackers and sleep hygiene. The mobile App provides ongoing information about your sleep health and actionable information for better sleep decisions. SleepTank™ allows you to monitor how sleep fuels your alertness. Track your sleep over time -- not just how you slept last night—using the SleepTank™ Reflects the cumulative quantity and quality of ALL prior sleep Forecast the impact of prior sleep history on future alertness Calibrated to your individual sleep goal Proactively plan sleep to improve alertness Visualize when alertness will become seriously impaired Plan when to go to bed to restore alertness Plan the length and timing of naps Visualize how a nap will extend alertness Visualizes the SleepTank™ History to see Trends in Sleep Health Ideal app for workers planning sleep to be alert on the job, such as shift workers, airline pilots, and emergency workers. Participate in Research Studies - if you consent to participate in a research study using SleepTank™ a study manager will assign you to a specific study group; you will receive a Group Code when you create your account. Works with wearable sleep trackers that estimate Sleep Duration and Quality. SleepTank™ Provides Actionable Information on Sleep • Have I had enough sleep over the long run? • Am I rested enough for duty? • How long will it be before I am dangerously in need of sleep? • Do I need to take a nap? • How soon do I need to nap and how long does the nap need to be? SleepTank™ Provides Ongoing Sleep Health Indicators • Considers the amount & quality of prior sleep • Considers how long a person has been awake • Considers personal sleep “goal” or need • Shows current status: time left in SleepTank™ • Shows history of daily SleepTank™ status • Recommends nap length to restore sleep health

About

Poolendar

Features
Read full description

Living with IBS, Crohn's, colitis, or food sensitivities? Poolendar is the only tracker that logs both bowel movements AND gas to give you the complete picture of your gut health. YOUR PRIVACY IS SACRED No account. No sign-up. No analytics. Your health data belongs to you and no one else. Poolendar is designed with privacy as the absolute priority. There are no external servers storing your information. Everything is saved on your device and, if you enable iCloud, synced in an encrypted way through Apple CloudKit, the most secure infrastructure on the market. Not even we can access your data. VISUAL CALENDAR See at a glance how your gut health evolves day by day. The color-coded Bristol Scale shows you patterns you were missing before. 10-SECOND LOGGING Bristol type, stress level, and consumption chips (gluten, lactose, FODMAPs, alcohol, coffee and more) without typing anything. You can even log gas, something other apps completely ignore. AI THAT FINDS PATTERNS The AI analysis runs directly on your device. It correlates what you eat with how you feel and helps you identify potential triggers. All without sending a single byte to external servers. BREAK THE TABOO Join support groups or create your own. Sharing your progress with people who understand what you're going through makes all the difference. Digestive disorders affect millions of people, but nobody talks about them. REPORTS FOR YOUR DOCTOR Export clear, professional PDFs so your gastroenterologist sees exactly what you've experienced between appointments. Objective data that makes diagnosis and follow-up easier. DESIGNED FOR THOSE WHO NEED IT - Irritable Bowel Syndrome (IBS-C, IBS-D, IBS-M) - Inflammatory Bowel Disease (IBD) - Crohn's disease & ulcerative colitis - SIBO & bacterial overgrowth - Celiac disease & food intolerances - Any functional GI disorder FREE FOREVER Event logging is completely free, with no limits, forever. Advanced features like AI analysis, report export, and social features cost less than a coffee per month. Understanding your gut shouldn't be this hard. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

SleepTank™3 screens
Poolendar4 screens

Verdict

The call

The clearest difference is in-app purchases: SleepTank™ at none against Poolendar's 6. SleepTank™ also leads on iOS requirement (13.0 vs 26.0). On price, update cadence, 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

Both are free to download. Poolendar sells 6 in-app purchases, starting at $1.99 per month. SleepTank™ asks for nothing beyond the download.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. Both last shipped on October 25, 2026.

Scorecard2 real differences · 4 level
SleepTank™ versus Poolendar: the parameters behind the verdict, then further details
ParameterSleepTank™Poolendar
PriceFreeFree
Update frequencyEvery 2 monthsEvery 2 months
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhone, iPad, iPod — betteriPhone, Apple Watch
Requires iOS13.0 — better26.0
Further details — not scored
Size25 MB19 MB
Age rating17+12+
DeveloperInstitutes for Behavior Resources, Inc.Juan Colilla

In-app purchases

None

SleepTank™

No in-app purchases

6 purchases

Poolendar

Subscriptions4
  • AI Analysis - Monthly$1.991 Month
  • Social Group Creator - Monthly$2.991 Month
  • AI Analysis - Annual7 Days trial$17.991 Year
Show 1 more
  • Social Group Creator - Annual1 Month trial$29.991 Year
One-time2
  • Medical Report Export$4.99
  • Poolendar Founder$249.99

Questions

Is SleepTank™ free?
SleepTank™ is free to download, with no in-app purchases.
Is Poolendar free?
Poolendar is free to download, with in-app purchases available.
Do SleepTank™ or Poolendar have ads?
Neither SleepTank™ nor Poolendar shows ads.
Which is updated more often, SleepTank™ or Poolendar?
SleepTank™ ships an update every 2 months, and Poolendar every 2 months. Most recently, SleepTank™ was updated on October 25, 2026 and Poolendar on October 25, 2026.

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