Comparison

Word Memo vs Rainfall Calculator

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

Head to head
About

Word Memo

Features
Read full description

Let's create your original word list! Amazing Quiz function can be remind word like a game! Easy buck up and restore the your important Data to iCloud! ============================= 【Introduction】 Let's create your original word list! If you use this application, Study of word will be perfect! You can mind word like a game by Quiz function that you created word list! Folder Hierarchy function can be create word list by category! (For example, English,Chinese,Korean) Support iCloud can be buck up and restore your important Data Easily! By PassCode Lock function, protect your privacy perfectly! 【Detail】 Word Memo is the word save and management application. You can save that you want mind word by folder and list. And you avail Quiz function by folder and list. Support iCloud can be buck up and restore your important Data Easily! Passcode Lock function, protect your privacy perfectly! 【Function】 1.Save and management word (word, mean). 2.Word management by folder and list. 3.Word check function 4.Quiz function by you created list. 5.Copy,Cut and Paste function some words. 6.Buck up and restore to iCloud. 7.Passcode Lock function. 【How to use】 -Register word Tap [Regist] from Tab. Enter a word and word mean. After select save destination list, tap the save button. -Create folder(List) Tap [List] from Tab. Tab right abobe button, select [Add Folder(List)] from popup. Enter a Folder(List) and select icon and tap save button. -Start Quiz In word list, tap right adobe button, select [Quiz] from popup. Select Quiz show mode [list order] or [random order], and select [mind word] or [mind mean]. After this, will start Quiz. (* If you try Quiz. Must at least 4 words in your folder or list.) 【Notice】 -If you try buck up function, required iCloud account.

About

Rainfall Calculator

Calculate potential rainwater harvest volume and cost savings. This tool helps determine annual water collection capacity based on rainfall and roof area, recommending optimal tank sizes for efficient water storage. It also allows for cost-saving analysis by comparing harvested water to mains water prices.

Highlights
  • Instant rainwater calculation
  • Cost savings evaluation
  • Minimum tank size recommendation
  • Supports various input units
  • Formula references included
  • Results copyable to other apps
Features
Read full description

The Rainfall Calculator is a physics/math tool designed to help you determine how many liters/gallons of rainwater you can harvest per year, evaluate cost savings, and recommend the minimum tank size for water storage. Features: - Instant calculation. - Results can be copied to other apps. - Includes formula references. - Supports up to 16 decimal places. - Supports various units for each input. - Works seamlessly on both iPhone and iPad. - Lightweight, compact app optimized for everyday use. - Ad-free and built with privacy in mind. Rainwater Collection Calculator: - The catchment area is multiplied by the depth of rain that falls on it to give the total volume of water produced. - 1 millimeter of rain over 1 square meter of roof equals 1 liter of water. - Annual rainfall (in millimeters) x Roof surface area (in square meters) = Roof catchment capacity. - You can add the cost of mains or tap water per m³ to evaluate the annual cost savings if this rainwater is collected and used instead of drinking water. - The minimum tank size should store 33% of the "Annual Rainfall On Your Roof Area" as you will use the water while you are collecting it. The rain will collect in gutters that channel the water into downspouts and then into some sort of storage vessel. Rainwater collection systems can be as simple as collecting rain in a rain barrel or as elaborate as harvesting rainwater into large cisterns to supply your entire household demand. You can also collect rainwater for garden use. Plants prefer rainwater because it's naturally soft and free of chlorine and other chemicals. If drought is a problem where you live, collecting rainwater is a good way to handle watering restrictions. If you're on a municipal water system, you can save a considerable amount of money. Thank you for your support! Visit nitrio.com for more apps for your iOS devices.

Screenshots

Word Memo4 screens
Rainfall Calculator4 screens

Verdict

The call

The clearest difference is price: Word Memo at Free against Rainfall Calculator's $2.99. Word Memo also leads on update cadence (every 2 months vs every 29 months) and iOS requirement (8.0 vs 13). On ads, in-app purchases 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

Word Memo is free to download; Rainfall Calculator costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Word Memo ships an update every 2 months, Rainfall Calculator every 29 months. The most recent releases landed on November 6, 2026 and November 2, 2026 respectively.

Scorecard3 real differences · 6 level
Word Memo versus Rainfall Calculator: the parameters behind the verdict, then further details
ParameterWord MemoRainfall Calculator
PriceFree — better$2.99
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyEvery 2 months — betterEvery 29 months
AdsNoNo
In-app purchasesNoNo
Monetization—Paid
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS8.0 — better13
Further details — not scored
Size4 MB1 MB
Age rating4+4+
DeveloperTaku InoueNitrio

In-app purchases

None

Word Memo

No in-app purchases

None

Rainfall Calculator

No in-app purchases

Questions

Is Word Memo free?
Word Memo is free to download, with no in-app purchases.
Is Rainfall Calculator free?
Rainfall Calculator costs $2.99, with no in-app purchases.
Do Word Memo or Rainfall Calculator have ads?
Neither Word Memo nor Rainfall Calculator shows ads.
Which is updated more often, Word Memo or Rainfall Calculator?
Word Memo ships an update every 2 months, and Rainfall Calculator every 29 months. Most recently, Word Memo was updated on November 6, 2026 and Rainfall Calculator on November 2, 2026.

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