| What it does | All-in-one calculator app with 1,001 calculators offline, no ads, and no data collection
| Free calculators for sleep, mental wellbeing, recovery, fitness, nutrition and healthy living
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| Free
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| Pricing | Free: 250 calculators forever. Pro: 7-day free trial, then £0.99 first year (introductory price), £2.99 per year after. Trade Tools: £9.99 once (includes one year of Pro).
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| Key features | - Works completely offline with no internet required
- No advertisements on any tier
- No data collection or tracking
- Construction tools for feet and inches calculations
- Trade tools for plumbing, electrical, HVAC and other trades
- Create itemised quotations and invoices on your letterhead
- Timesheet to take-home pay calculator with PDF export
- Monthly budget planner with spending analysis
- Compare mortgages and calculate overpayment savings
| - Sleep Cycle Calculator for planning bedtimes based on 90-minute cycles
- Bedtime Calculator to find sleep time based on wake-up time and duration
- Wake-Up Time Calculator based on bedtime and sleep cycles
- Sleep Debt Calculator to estimate missed sleep over a week
- Caffeine Half-Life Calculator to estimate caffeine remaining in body
- How Much Sleep Do I Need Calculator with age-based estimates
- 20 calculator hubs across Sleep, Mind, Body, Family and Lifestyle categories
- Transparent formulas showing the math behind each result
- Evidence-based references citing primary sources
- Editorial and clinical review for sensitive health tools
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| What makes it different | - 250 calculators free forever across all categories
- All calculations performed on device with no data transmission
- Ten trade tool sets in one purchase with stairs and roofs drawn to scale
- Complete job management from quoting to timesheets in one app
- No account, sign-in or permissions required
| - Private calculations in browser with no account required or personal data selling
- Transparent formulas and methodology for every calculator
- Evidence-based content citing primary sources not rewrites
- Regularly updated formulas with versioning and review dates
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | Not checked yet ● no change since last check | 17 ● no change since last check |
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| Trust Flow (Majestic) | 2 | 0 |
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| Citation Flow (Majestic) | 2 | 10 |
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| Referring domains (Majestic) | 21 | 16 |
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1001 Pro Calculators and Tools
WowSleepCalculator