Comparison

SAS Survival Guide vs HydroGrow

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

Head to head
About

SAS Survival Guide

This app offers essential wilderness survival information, including fire building, water sourcing, and navigation techniques. It features photo galleries, instructional videos, and a quiz to test your knowledge. Prepare for outdoor adventures with this entry-level survival guide.

Highlights
  • Basic survival information
  • Fire building
  • Finding water
  • Navigation by stars
  • Survival kit checklist
  • Instructional videos
Features
Read full description

This is the FREE version of the Best seller iTunes app, the SAS Survival Guide, available now in the App Store and as an inApp Purchase. Based on the million-copy bestselling book, this fantastic free app provides you with a bare bones guide to wilderness survival. Jam-packed with basic survival tools, you'll be equipped for any expedition to the outdoors with this entry-level guide in your arsenal. ▶▶ ACCOLADES ◀◀ ◆◆◆ SAS Survival Guide wins "Official Honoree" Award at the 15th Annual Webbys ◆◆◆ ◆◆◆ Selected for "iTunes REWIND 2010" ◆◆◆ ◆◆◆ Listed under "Apple Featured Applications", "What's Hot" & "New & Noteworthy" Worldwide.◆◆◆ ◆◆◆ Has achieved the #1 LIFESTYLE APP in most geographic locations.◆◆◆ ▶▶ ABOUT THE SAS SURVIVAL GUIDE ◀◀ For over twenty years, the SAS Survival Guide has been the definitive guide to surviving any situation, anywhere in the world. Now, for the first time ever, the bestselling book has been reinvented for the iPhone. Written by former SAS soldier and instructor, John "Lofty" Wiseman, this application brings you the elite training techniques of Britain’s toughest fighting force in the most accessible version ever. Now you can take the world-class survival skills of the SAS with you anywhere in the world – from the peaks of Kilimanjaro to the deserts of Kandahar…or to your closest national park. The Lite App Contains: •Basic survival information including: building fires, finding water, navigating by the stars, survival kit, signals and codes •Photo galleries of cloud spotting, night sky navigation, and more •Video of Lofty Wiseman demonstrating knife skills •100+ question quiz to test if you've got what it takes to survive •Survival checklist to help you prepare for trips •Search the app by keyword for quick reference ▶▶▶ WHY NOT GET THE FULL APP ◀◀◀ The Full app contains: •Full text, in 9 chapters, of the bestselling book optimised for the iPhone •16 videos providing invaluable survival tips from Lofty himself •Photo galleries of edible, medicinal and poisonous plants •Morse Code signalling device •100 + question quiz to test if you've got what it takes to survive •Survival Checklist •Sun Compass •Search tool to scan entire book by subject •Extreme Climate Survival: sections on surviving Polar, Desert, Tropical, and Sea •Comprehensive First Aid section ------------------------------------ Also included for purchase is the ◆ SAS Urban Survival Guide ◆ Learn How to Protect Yourself Against Terrorism, Natural Disasters, Fires, Home Invasions, and Everyday Health and Safety Hazards

About

HydroGrow

Features
Read full description

HYDROGROW - YOUR HYDRATION COMPANION Staying hydrated has never been this fun! HydroGrow transforms the habit of drinking water into a gamified journey where you grow a virtual plant while taking care of your health. SMART PERSONALIZED GOALS We’re not a generic app! Your daily water goal is calculated based on: • Biological sex • Age • Body weight • Height The system uses scientifically validated formulas to determine the ideal amount of water for your specific body. GROW WITH YOUR PLANT Track your progress through a virtual plant that grows as you hydrate: • Seed → Sprout → Small Plant → Medium Plant → Full Tree • Each glass of water nourishes your plant • Smooth and rewarding animations • Visualize your health commitment QUICK AND EASY LOGGING • Preconfigured containers (100 ml, 200 ml, 500 ml, 1000 ml) • Add custom amounts • Log water with just one tap • Intuitive and elegant interface • Automatic light and dark modes DETAILED STATISTICS Track your hydration progress with data and charts: • Complete daily history • Weekly and monthly averages • Interactive bar charts • Goal achievement percentage • Hydration patterns over time TOTAL CONTROL • Navigate through previous days • Delete incorrect entries with a swipe • “Undo” function to reverse deletions • Edit your profile anytime • Automatically recalculates your goal MULTILINGUAL SUPPORT • English • Portuguese • Spanish • Fully translated interface MODERN DESIGN • Material Design 3 • Fluid animations • Custom SVG icons • Vibrant and harmonious colors • Delightful visual experience PRIVACY FIRST • All data stored locally • No information sent to servers • No registration or login required • Your body, your data, your control WHY CHOOSE HYDROGROW? Proper hydration is essential for: - Better brain function and focus - Healthier and glowing skin - Optimized digestion - Body temperature regulation - Nutrient transportation - Increased energy and vitality - Healthy kidney function - Improved physical performance FEATURE HIGHLIGHTS • Scientifically calculated goal based on your profile • 5 plant growth stages • Animated circular visual progress • Swipeable history navigation • Weekly and monthly charts • Data export (coming soon) • Customizable reminders (coming soon) • Apple Health integration (coming soon) START YOUR JOURNEY TODAY HydroGrow isn’t just a water tracker — it’s your partner in building healthy habits. With smart gamification and beautiful design, staying hydrated becomes a daily pleasure. Download now and watch your plant — and your health — flourish.

Screenshots

SAS Survival Guide4 screens
HydroGrow4 screens

Verdict

The call

The clearest difference is in-app purchases: HydroGrow at none against SAS Survival Guide's 2. HydroGrow also leads on update cadence (daily vs every 17 months) and iOS requirement (13.0 vs 15.6). On price, 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. SAS Survival Guide sells 2 one-off in-app purchases. HydroGrow asks for nothing beyond the download.

UpkeepUpdate frequency

SAS Survival Guide ships an update every 17 months, HydroGrow daily. The most recent releases landed on November 1, 2026 and November 12, 2026 respectively.

Scorecard3 real differences · 7 level
SAS Survival Guide versus HydroGrow: the parameters behind the verdict, then further details
ParameterSAS Survival GuideHydroGrow
PriceFreeFree
Rating3.6 (177 ratings) — better—
Positive reviews78.3% of reviews—
Number of ratings177 — better—
Update frequencyEvery 17 monthsDaily — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.613.0 — better
Further details — not scored
Size110 MB25 MB
Age rating4+4+
DeveloperTrellisys.netGuilherme Quintero Lorenzi

Bugs and requests

SAS Survival Guide

Reported bugs

4 issues
  • Inability to access full content beyond first few paragraphs
  • Scrolling not working in certain sections
  • Videos not playing or getting stuck
  • Inconsistent app behavior across devices

Requested features

4 requests
  • More detailed survival content
  • Video tutorials and demonstrations
  • Offline access to full content
  • Ability to save progress and notes

HydroGrow

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

SAS Survival Guide

One-time2
  • Urban SAS$3.99
  • SAS Survival Guide$5.99
None

HydroGrow

No in-app purchases

Questions

Is SAS Survival Guide free?
SAS Survival Guide is free to download, with in-app purchases available.
Is HydroGrow free?
HydroGrow is free to download, with no in-app purchases.
Do SAS Survival Guide or HydroGrow have ads?
Neither SAS Survival Guide nor HydroGrow shows ads.
Which is updated more often, SAS Survival Guide or HydroGrow?
SAS Survival Guide ships an update every 17 months, and HydroGrow daily. Most recently, SAS Survival Guide was updated on November 1, 2026 and HydroGrow on November 12, 2026.

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