ProjectorCalc vs Ambulance Siren
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ProjectorCalc
This utility app helps lighting technicians and projectionists calculate projected image dimensions. It determines image width, height, diagonal length, brightness, area, and pixel density based on projector and location details. It also estimates keystone distortion.
- Calculate image width, height, and diagonal length
- Determine brightness in Nits
- Calculate total projected area
- Compute pixels per inch
- Estimate keystone distortion
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Winner of the 2010 Live Design Projection Product of the Year - Software/App Category ProjectorCalc is a program for professional lighting technicians and projectionists. Its primary purpose is to determine the size of a projected image given various information about the projector and it's location. ProjectorCalc allows users to enter details for a projector and its location in relation to a projection surface. ProjectorCalc will calculate image width, image height, diagonal length, brightness in Nits, total projected area, and how many pixels per inch the projected image will be. Additionally, ProjectorCalc can give you an estimate of how much keystone distortion will occur by calculating the length of each side of the distorted image.
Ambulance Siren
This app provides realistic ambulance siren sounds and lighting effects for entertainment. It can be used for pranks or as a novelty alarm. Explore various sound options and light patterns for fun.
- Ambulance siren sound effects
- Lighting effects
- Alarm function
- Tricky sound options
- Soundboard for pranks
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Ambulance Siren is a Funny Tricky sound effect app for you. You can use your mobile to emit “ambulance” siren for fun, sometimes it may useful if you face any “Dangers”. Also, there are lighting effect and alarm function in this app. Play the tricky with your friends!
Screenshots
Verdict
The clearest difference is price: Ambulance Siren at Free against ProjectorCalc's $2.99. Ambulance Siren also leads on iOS requirement (6.0 vs 9.2). ProjectorCalc's advantage is rating (5.0 vs 1.7) and review sentiment (38% vs 0%). On ratings volume, update cadence, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Ambulance Siren is free to download; ProjectorCalc costs $2.99 up front. Ambulance Siren sells 1 one-off in-app purchase. ProjectorCalc asks for nothing beyond the download.
ProjectorCalc holds the better App Store score, 5.0 against 1.7. Both are backed by a comparable volume of ratings — 2 and 3 respectively. Written reviews point the same way: 38% of ProjectorCalc's written reviews are positive against 0% of Ambulance Siren's.
ProjectorCalc ships an update every 49 months, Ambulance Siren every 25 months. The most recent releases landed on October 31, 2026 and November 1, 2026 respectively.
| Parameter | ProjectorCalc | Ambulance Siren |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 5.0 (2 ratings) — better | 1.7 (3 ratings) |
| Positive reviews | 37.5% of reviews — better | 0.0% of reviews |
| Number of ratings | 2 | 3 — better |
| Update frequency | Every 49 months | Every 25 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 9.2 | 6.0 — better |
| Further details — not scored | ||
| Size | 10 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | D!HV Lighting | IGEARS TECHNOLOGY LTD |
Customer experience
ProjectorCalc
Ambulance Siren
In-app purchases
ProjectorCalc
No in-app purchases
Ambulance Siren
- Remove Advertisements$0.99
Questions
Is ProjectorCalc free?
Is Ambulance Siren free?
Which has better reviews, ProjectorCalc or Ambulance Siren?
Do ProjectorCalc or Ambulance Siren have ads?
Which is updated more often, ProjectorCalc or Ambulance Siren?
Other comparisons
