KeyLight PRO vs Manual Flash Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
KeyLight PRO
This app simplifies off-camera flash photography by providing calculators for optimal exposure settings. It helps photographers determine ISO, aperture, strobe power, and distance, removing guesswork for both beginners and advanced users. Manage multiple lighting setups and modifiers with its virtual gear bag.
- Exposure calculators (ISO, aperture, strobe power, distance)
- Key Falloff calculator
- Virtual Gear Bag for unlimited strobe configurations
- Strobe Library with 100+ pre-loaded models
- Support for various light modifiers
- Save multiple setups
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Shooting off-camera flash photography is challenging. Optimal exposure settings requires a knowledge of how to balance ISO sensitivity, aperture level, strobe power and strobe proximity to the subject. Because strobe power varies dramatically not only between manufacturers and models but also when external elements such as umbrellas, soft-boxes and lighting gels are used, quickly determining correct exposure settings can be challenging at best, and frustrating at the worst. KeyLight PRO removes all of this guesswork. Easy-to-use calculators quickly and clearly display optimal ISO levels, aperture settings, strobe power levels and strobe-to-subject distances in an intuitive, familiar interface. For the more advanced photographer, the Key Falloff calculator will calculate the proximity of the strobe from the subject in order to meet a desired exposure value falloff over a specific distance. For example, the area behind a subject is 10 feet away, should be 3 stops underexposed relative to the subject, and the strobe is firing at 1/4 power and the camera is at ISO 400. What should the aperture setting be on the camera? With KeyLight PRO, the answer is a tap away. How many strobes does KeyLight PRO support? The Virtual Gear Bag provides an unlimited number of strobe makes, models and settings, and the Strobe Library provides over 100 pre-loaded strobe model configurations. The Gear Bag is readily accessible on all of the calculators, providing quick, easy and accurate exposure settings when swapping between your strobes. Only using one strobe? Keep multiple "set ups" in your Gear Bag under a variety of configurations: bare bulbed, gelled, soft-boxed, umbrellaed, neutral-density filtered, wall-bounced, go-bo'd. There is no limit to the number of ways the light from a single strobe can be modified. Create as many configurations for these light modifiers as you need, and know in an instant how to most effectively utilize them. KeyLight PRO. Control the light.
Manual Flash Calculator
This app assists photographers by calculating camera and flash settings for manual flash photography. It allows users to create gear lists and kits, and then use this information to determine the fourth parameter (like flash power) when any three of the four relevant settings are known.
- Manual flash photography calculator
- Configure camera and flash settings
- Calculate missing parameter from three inputs
- Create and manage gear lists
- Organize gear into custom kits
- Persistent local data storage
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Get the Manual Flash Calculator to help configure your camera and flash setting when doing manual flash photography. Based on the flash and camera you use, setting any 3 of the 4 relevant parameters the fourth can be calculated. E.g. calculate the required flash power based on your ISO, F-Stop, subject distance and used flash specifications. The app support creating a list of the gear you use and combine them in a kit. You can add as much gear as you like and create as many kits to your use cases. Further to that you can add a flash calculator to a kit. And you can add as many calculators as you want. All data is saved persistently and remains available between sessions. What is included: * Gear List. Make an inventory of your gear. This gear list will provide you with a structured overview of the equipment you have in use. * Kit List. A kit can be seen as a collection of gear you target to use in specific cases. I.e. like for a kit dedicated to street photography, a kit dedicated to nature photography etc. Just create what suits you and add the relevant gear. * Flash Calculator. Based from your kit a calculator can be added that will use the gear part of the equipment to feed the relevant parameters input to the flash calculator. * Data is maintained in local database and will persist over several sessions. Add data once and just use it as you see fit. * Can be used on iPhone, iPad and Mac. It optimizes the use of the available canvas for each * A detailed release note, with what is new, changed, updated etc., is included in the app
Screenshots
Verdict
The clearest difference is review sentiment: KeyLight PRO at 44% against Manual Flash Calculator's 0%. KeyLight PRO also leads on price ($0.99 vs $2.99) and iOS requirement (10.0 vs 18.1). Manual Flash Calculator's advantage is update cadence (every 11 days vs every 26 months) and chart position (#190 vs unranked). On ads, in-app purchases, monetization model 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
KeyLight PRO costs $0.99 and Manual Flash Calculator $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
KeyLight PRO ships an update every 26 months, Manual Flash Calculator every 11 days. The most recent releases landed on September 23, 2026 and September 12, 2026 respectively.
| Parameter | KeyLight PRO | Manual Flash Calculator |
|---|---|---|
| Price | $0.99 — better | $2.99 |
| Rating | 4.0 (4 ratings) — better | — |
| Positive reviews | 44.4% of reviews — better | 0.0% of reviews |
| Number of ratings | 4 — better | — |
| Update frequency | Every 26 months | Every 11 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Best chart rank | — | #190 — better |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 10.0 — better | 18.1 |
| Further details — not scored | ||
| Size | 3 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Daniel Brewer | Winterink |
Customer experience
KeyLight PRO
Manual Flash Calculator
In-app purchases
KeyLight PRO
No in-app purchases
Manual Flash Calculator
No in-app purchases
Questions
Is KeyLight PRO free?
Is Manual Flash Calculator free?
Do KeyLight PRO or Manual Flash Calculator have ads?
Which is updated more often, KeyLight PRO or Manual Flash Calculator?
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