# Spark vs Work+Proof

The clearest difference is update cadence: Work+Proof at weekly against Spark's every 5 weeks. 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 Work+Proof sells 2 in-app purchases, starting at $8.99 per month. Whichever you choose, the download price is not the number that matters.

Spark ships an update every 5 weeks, Work+Proof weekly. The most recent releases landed on September 24, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Spark | Work+Proof |
| --- | --- | --- |
| 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 | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 14 MB | 44 MB |
| Requires iOS | 15.6 | **14.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [E.L.K. Equities LLC](https://appshunter.io/developer/1775442602) | [Osibits](https://appshunter.io/developer/1857440577) |

## 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


### Work+Proof

[App page](https://appshunter.io/ios/app/work-plus-proof/id6755934931)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| WorkProof Monthly | $8.99 | per month |
| WorkProof Yearly | $89.99 | per year |


## Frequently asked questions

### Is Spark free?

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

### Is Work+Proof free?

Work+Proof is free to download, with in-app purchases available.

### Do Spark or Work+Proof have ads?

Neither Spark nor Work+Proof shows ads.

### Which is updated more often, Spark or Work+Proof?

Spark ships an update every 5 weeks, and Work+Proof weekly. Most recently, Spark was updated on September 24, 2026 and Work+Proof on September 21, 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.*