Comparison

CalKeyboard vs 青蛙發票王

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

Head to head

CalKeyboard

Free

📊 Productivity

★ 3.45 ratingsView app →

About

CalKeyboard

This keyboard app integrates a calculator directly into your typing experience. Perform calculations without leaving your current application. It's designed for quick math needs while messaging or working.

Highlights

Integrated calculator
Type and calculate simultaneously
Seamless integration
Quick calculations

Features

Read full description

No more explanation It's a keyboard with calculator should be created already keyboard!

About

青蛙發票王

Features

Read full description

操作簡單，功能完整的行動發票解決方案。藍牙列印，行動力滿滿～可掃支付碼，可傳送 B2B A4 PDF 發票版本。支援中國產的公版藍牙印表機，不用綁定 E 牌， S 牌幾款。可提供免費測試，e-mail 索取帳號大歡迎！

Screenshots

CalKeyboard4 screens

青蛙發票王4 screens

Verdict

The call

The clearest difference is in-app purchases: 青蛙發票王 at none against CalKeyboard's 1. 青蛙發票王 also leads on update cadence (every 5 days vs every 8 months). On price, ads, device support and iOS requirement 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. CalKeyboard sells 1 one-off in-app purchase. 青蛙發票王 asks for nothing beyond the download.

UpkeepUpdate frequency

CalKeyboard ships an update every 8 months, 青蛙發票王 every 5 days. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

Scorecard2 real differences · 8 level

CalKeyboard versus 青蛙發票王: the parameters behind the verdict, then further details
Parameter	CalKeyboard	青蛙發票王
Price	Free	Free
Rating	3.4 (5 ratings) — better	—
Positive reviews	50.0% of reviews	—
Number of ratings	5 — better	—
Update frequency	Every 8 months	Every 5 days — better
Ads	No	No
In-app purchases	Yes	No — better
Monetization	Free with in-app purchases	—
Devices	iPhone, iPod	iPhone, iPod
Requires iOS	15.0	15.0
Further details — not scored
Size	2 MB	9 MB
Age rating	4+	4+
Developer	FebesGoods Studio	至簡科技有限公司

In-app purchases

1 purchases

CalKeyboard

One-time1

Full Version$0.99

None

青蛙發票王

No in-app purchases

Questions

Is CalKeyboard free?

CalKeyboard is free to download, with in-app purchases available.

Is 青蛙發票王 free?

青蛙發票王 is free to download, with no in-app purchases.

Do CalKeyboard or 青蛙發票王 have ads?

Neither CalKeyboard nor 青蛙發票王 shows ads.

Which is updated more often, CalKeyboard or 青蛙發票王?

CalKeyboard ships an update every 8 months, and 青蛙發票王 every 5 days. Most recently, CalKeyboard was updated on November 3, 2026 and 青蛙發票王 on October 31, 2026.