# CalcKit vs Next Reservation

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.

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

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.

## The numbers

| Metric | CalcKit | Next Reservation |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 80.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 30 months | **Every 6 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 0 MB | 5 MB |
| Requires iOS | **15.6** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Akkyra Systems](https://appshunter.io/developer/300710095) | [takaaki024](https://appshunter.io/developer/393783638) |

## What reviewers say

### CalcKit

[App page](https://appshunter.io/ios/app/calckit/id321006774)

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:** macOS Compatibility

**In-app purchases:** none


### Next Reservation

[App page](https://appshunter.io/ios/app/next-reservation/id6740490473)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*