# Spark vs ShiftLens Calendar

The clearest difference is update cadence: ShiftLens Calendar at every 2 weeks against Spark's every 5 weeks. Spark's advantage is iOS requirement (15.6 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Spark sells 2 one-off in-app purchases and ShiftLens Calendar sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

Spark ships an update every 5 weeks, ShiftLens Calendar every 2 weeks. The most recent releases landed on September 24, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | Spark | ShiftLens Calendar |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (7.5K ratings)](https://appshunter.io/ios/app/spark-shift-calendar/id390915382/reviews)** | — |
| Number of ratings | **7.5K** | — |
| Positive reviews | 74.5% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 2 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 14 MB | 7 MB |
| Requires iOS | **15.6** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [E.L.K. Equities LLC](https://appshunter.io/developer/1775442602) | [Efthymios Tampouris](https://appshunter.io/developer/1894689245) |

## What reviewers say

### Spark

[App page](https://appshunter.io/ios/app/spark-shift-calendar/id390915382)

This app simplifies shift work for professionals like first responders and healthcare workers. It offers full customization, secure cloud syncing, and streamlined shift trading. Plan your life and stay organized with instant visual cues and reliable support.

**Highlights:** Full shift customization, Secure cloud sync, Streamlined shift trades, Instant visual cues, Comprehensive shift coverage, User-friendly interface

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annual Subscription Renewal | $0.99 | one-time |
| Initial Annual Subscription | $5.99 | one-time |

**What reviewers like**

- 🚀 Excellent calendar app
- 👍 Easy to use and set up
- 🔒 Secure and reliable
- 💡 Customizable and feature-rich
- 👍 Great for shift work and emergency services

**What reviewers complain about**

- 🐛 Occasional crashes and bugs
- 💰 Subscription model and pricing issues
- 🔧 Needs more frequent updates
- 🔧 Compatibility issues with newer devices
- 🔧 Lack of certain features (e.g., widgets, dark mode)

**Reported bugs**

- Login and authentication problems
- Data loss and sync issues after updates
- Unreliable performance on some devices

**Requested features**

- Ability to sync with more calendar services
- More customization options
- Improved user interface and design
- Ability to view past schedules and events


### ShiftLens Calendar

[App page](https://appshunter.io/ios/app/shiftlens-calendar/id6763584318)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ShiftLens Pro Monthly | $1.99 | per month |
| ShiftLens Pro Yearly | $12.99 | per year |
| ShiftLens Pro Lifetime | $24.99 | one-time |


## Frequently asked questions

### Is Spark free?

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

### Is ShiftLens Calendar free?

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

### Do Spark or ShiftLens Calendar have ads?

Neither Spark nor ShiftLens Calendar shows ads.

### Which is updated more often, Spark or ShiftLens Calendar?

Spark ships an update every 5 weeks, and ShiftLens Calendar every 2 weeks. Most recently, Spark was updated on September 24, 2026 and ShiftLens Calendar on September 7, 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.*