Comparison

GridDown vs Calculator Plug

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

Head to head
About

GridDown

Features
Read full description

GridDown is your personal emergency preparedness and survival planning app. Build your survival team, organize essential supplies, save bug-out locations, create emergency plans, and know exactly where to go when normal systems are unavailable. BUILD YOUR SURVIVAL TEAM Create your trusted emergency network and assign members to important roles including Leadership, Security, Medical, Food & Water, Shelter, Communications, and Morale. Add skills, contact information, notes, photos, and saved locations for each member. PLAN YOUR BUG-OUT LOCATIONS Save multiple bug-out destinations, rally points, supply locations, and other important places. Choose your primary destination and use Apple Maps to view locations and navigate when needed. TRACK FOOD & WATER Build an inventory of emergency food, water, and long-term storage items. Organize quantities, expiration dates, storage locations, and preparedness goals. ORGANIZE YOUR SUPPLIES Track medical supplies, power equipment, lighting, communications gear, tools, fuel, clothing, hygiene products, vehicle equipment, and other essentials. BUILD GO BAGS Create individual emergency bags for yourself, family members, vehicles, or specialized purposes. Use checklists to quickly see what is ready and what is missing. CREATE EMERGENCY PLANS Prepare plans for power outages, severe storms, evacuations, extended grid failures, communication outages, and other emergencies. Create rally points, assign responsibilities, and organize the actions your team should take. SEE YOUR READINESS GridDown brings your preparedness information together into a simple dashboard so you can quickly identify missing team roles, supplies, locations, and planning tasks. MAP YOUR PLAN View team member locations, bug-out destinations, rally points, medical locations, supply caches, and other important places using Apple Maps. OFFLINE-FIRST & PRIVATE Emergency information shouldn't depend on an internet connection or an online account. GridDown is designed around locally stored preparedness information so your essential plans remain available on your device. Whether you're preparing for a storm, extended power outage, evacuation, natural disaster, or simply want your family better organized, GridDown gives you one place to build your plan before you need it. Know your people. Know your supplies. Know where you're going. Be ready with GridDown.

About

Calculator Plug

Access over 450 specialized calculators for construction, finance, health, trades, and more. This app offers a clean, offline-capable interface for quick, accurate calculations without intrusive ads.

Highlights
  • 450+ searchable calculators
  • Offline functionality
  • Clean dark interface
  • Construction calculators
  • Finance calculators
  • Health and fitness calculators
  • Trades calculators
Features
Read full description

Calculator Plug puts 450+ real-world calculators in one fast, clean app - built for people who need a real answer, not a search engine full of pop-ups. CATEGORIES - Construction and home: concrete, drywall, flooring, roofing, framing, square footage - Finance and money: mortgage, loan, refinance, compound interest, ROI, retirement - Health and fitness: BMI, calories, macros, body fat, heart rate, pace - Math and science: algebra, geometry, statistics, chemistry, physics - Trades: electrical, plumbing, HVAC, welding, structural engineering - Trading and investing: position size, pip value, cost basis, capital gains - Conversions, automotive, business, date and time, and more - Field pack: local weather, tides, sunrise/sunset and moon times FEATURES - 450+ calculators, searchable in a tap - Works offline (except live weather and tides) - Pro unlocks every calculator; Pro+ adds the professional suite - Clean dark interface, no clutter Free to use with a core set. Pro and Pro+ unlock the full library. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

GridDown4 screens
Calculator Plug4 screens

Verdict

The call

The clearest difference is in-app purchases: GridDown at none against Calculator Plug's 4. Calculator Plug's advantage is update cadence (every 4 days vs every 6 months) and iOS requirement (15.1 vs 26.5). 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. Calculator Plug sells 4 in-app purchases, starting at $5.99 per month. GridDown asks for nothing beyond the download.

UpkeepUpdate frequency

GridDown ships an update every 6 months, Calculator Plug every 4 days. The most recent releases landed on October 15, 2026 and October 14, 2026 respectively.

Scorecard3 real differences · 6 level
GridDown versus Calculator Plug: the parameters behind the verdict, then further details
ParameterGridDownCalculator Plug
PriceFreeFree
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyEvery 6 monthsEvery 4 days — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS26.515.1 — better
Further details — not scored
Size6 MB34 MB
Age rating4+4+
DeveloperYOURFULLSTACK, LLCMark Gabrielli

In-app purchases

None

GridDown

No in-app purchases

4 purchases

Calculator Plug

Subscriptions2
  • Pro Monthly$5.991 Month
  • Pro+ Monthly$9.991 Month
One-time2
  • Pro Lifetime$29.99
  • Pro+ Lifetime$44.99

Questions

Is GridDown free?
GridDown is free to download, with no in-app purchases.
Is Calculator Plug free?
Calculator Plug is free to download, with in-app purchases available.
Do GridDown or Calculator Plug have ads?
Neither GridDown nor Calculator Plug shows ads.
Which is updated more often, GridDown or Calculator Plug?
GridDown ships an update every 6 months, and Calculator Plug every 4 days. Most recently, GridDown was updated on October 15, 2026 and Calculator Plug on October 14, 2026.

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