# Signal Light vs Citation Mapper

The clearest difference is price: Citation Mapper at Free against Signal Light's $0.99. Citation Mapper also leads on update cadence (daily vs every 25 months). Signal Light's advantage is in-app purchases (none vs 6). On ads, device support and iOS requirement there is nothing between them.

Citation Mapper is free to download; Signal Light costs $0.99 up front. Citation Mapper sells 6 one-off in-app purchases. Signal Light asks for nothing beyond the download.

Signal Light ships an update every 25 months, Citation Mapper daily. The most recent releases landed on September 8, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Signal Light | Citation Mapper |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/signal-light/id1031126579/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 25 months | **Daily** |
| Monetization | Paid | — |
| Size | 21 MB | 26 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Bryan Wu](https://appshunter.io/developer/1002993092) | [Adeyemi Salau](https://appshunter.io/developer/1618952741) |

## What reviewers say

### Signal Light

[App page](https://appshunter.io/ios/app/signal-light/id1031126579)

Communicate with others using Morse code via your device's flash. This tool is useful for signaling in various situations, from camping to emergencies, and can also function as a manual strobe light.

**Highlights:** Morse code communication, Manual strobe light, SOS signaling, Line-of-sight tool, Flashlight spotlight

**Features:** macOS Compatibility

**In-app purchases:** none


### Citation Mapper

[App page](https://appshunter.io/ios/app/citation-mapper/id6759833224)

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Professional Monthly | $24.99 | one-time |
| Premium Monthly | $49.99 | one-time |
| Enterprise Monthly | $99.99 | one-time |
| Professional Yearly | $239.99 | one-time |
| Premium Yearly | $479.99 | one-time |
| Enterprise Yearly | $959.99 | one-time |


## Frequently asked questions

### Is Signal Light free?

Signal Light costs $0.99, with no in-app purchases.

### Is Citation Mapper free?

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

### Do Signal Light or Citation Mapper have ads?

Neither Signal Light nor Citation Mapper shows ads.

### Which is updated more often, Signal Light or Citation Mapper?

Signal Light ships an update every 25 months, and Citation Mapper daily. Most recently, Signal Light was updated on September 8, 2026 and Citation Mapper on September 10, 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.*