Comparison

CalcKit vs Next Reservation

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

Head to head
About

CalcKit

Design and build your own custom calculators with personalized formulas and input labels. Organize them into groups for easy access. Ideal for students, scientists, and engineers needing more than standard calculator functions.

Highlights
  • Design calculators with custom formulas
  • Up to seven user-defined variables
  • Built-in trig and math functions
  • Organize calculators into groups
  • Unlimited personal calculator creation
Features
Read full description

CalcKit lets you create your own personalized calculators. With CalcKit you can: - Design calculators using your own formulas and input labels - Enter formulas with up to seven user-defined variables - Make use of built-in trig and other math functions - Organize your calculators into convenient groups CalcKit has a simple, intuitive interface, and it comes with a set of example calculators to get you started. You can create an unlimited number of personal calculators. Each formula can be as simple or as complex as you need. CalcKit is ideal for students, scientists, engineers and others who do everyday calculations and need more than a limited set of canned formulas.

About

Next Reservation

Easily schedule recurring appointments and add them to your device's calendar. Set preferred intervals for services like haircuts or dental visits and quickly register them with optional location-based reminders.

Highlights
  • Schedule recurring appointments
  • Add appointments to calendar
  • Set preferred scheduling intervals
  • One-tap registration
  • Location-based reminders
  • Pre-set appointment templates
Features
Read full description

β– 1. What Does This App Do? This app is designed to help you schedule your "next appointment" and add it to your calendar. At first glance, you might wonder, β€œDo I really need an app for that?” However, if you’ve ever found yourself in situations like the following, it might be worth giving it a try: - At the dentist, trying to schedule your next appointment three months out, but fumbling to flip through the calendar. - Booking a time you thought was free, only to later realize it conflicts with another event. β– 2. How Does It Work? Once you set up your preferred scheduling intervals in advance, the app allows you to: - Display the date/time for the next appointment (based on your set interval). - Make small adjustments if needed, then register the appointment to your calendar. That’s all there is to it! β– 3. Additional Benefits Even with such a simple feature set, adding one more setting can make your calendar even more convenient. For example, if you include a location in your appointment template, you’ll get a notification like, β€œIt’s time to leave,” around the time you should head out. This is actually a built-in feature of the iOS Calendar app, but manually adding locations every time can be a hassle or easy to forget. By pre-setting this in the app, you can enjoy the convenience with just one tap. β– 4. Usage Examples - Haircuts: Every 7 weeks - Dentist Appointments: Every 3 months To be honest, I currently only use the app for these two scenarios, which means I use it about once a month on average. :)

Screenshots

CalcKit4 screens
Next Reservation2 screens

Verdict

The call

The clearest difference is in-app purchases: CalcKit at none against Next Reservation's 1. CalcKit also leads on iOS requirement (15.6 vs 17.6). Next Reservation's advantage is update cadence (every 6 days vs every 30 months) and review sentiment (100% vs 80%). On price, ads and device support there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. Next Reservation sells 1 one-off in-app purchase. CalcKit asks for nothing beyond the download.

UpkeepUpdate frequency

CalcKit ships an update every 30 months, Next Reservation every 6 days. The most recent releases landed on September 24, 2026 and October 2, 2026 respectively.

Scorecard5 real differences Β· 3 level
CalcKit versus Next Reservation: the parameters behind the verdict, then further details
ParameterCalcKitNext Reservation
PriceFreeFree
Positive reviews80.0% of reviews100.0% of reviews β€” better
Update frequencyEvery 30 monthsEvery 6 days β€” better
AdsNoNo
In-app purchasesNo β€” betterYes
MonetizationFree β€” betterFree with in-app purchases
DevicesiPhone, iPodiPhone, iPad
Requires iOS15.6 β€” better17.6
Further details β€” not scored
Size0 MB5 MB
Age rating4+4+
DeveloperAkkyra Systemstakaaki024

Customer experience

CalcKit

Written reviews5 reviews
Positive80.0%
Neutral0.0%
Negative20.0%

Next Reservation

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

CalcKit

No in-app purchases

1 purchases

Next Reservation

One-time1
  • Remove Ads$1.99

Questions

Is CalcKit free?
CalcKit is free to download, with no in-app purchases.
Is Next Reservation free?
Next Reservation is free to download, with in-app purchases available.
Do CalcKit or Next Reservation have ads?
Neither CalcKit nor Next Reservation shows ads.
Which is updated more often, CalcKit or Next Reservation?
CalcKit ships an update every 30 months, and Next Reservation every 6 days. Most recently, CalcKit was updated on September 24, 2026 and Next Reservation on October 2, 2026.

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