Predilux vs CheckMarked
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Predilux
This app helps photographers and videographers predict light exposure based on light source and distance. It also allows inverse measurement of distance by specifying exposure, considering various camera and light source settings, and gels.
- Predict light exposure
- Measure distance to light source
- Adjust camera settings (FPS, ISO, Shutter)
- Configure light source settings
- Apply gel effects (Diffusion, CTO/CTB, +- Green)
- Experimentally verified results
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Predilux lets you predict the exposure (key light) measured by a light meter, by choosing a light source and a distance. Or inversely measure the distance to the light source by specifying the exposure. Predilux takes into account camera settings (FPS, ISO, Shutter), source settings (Focalization, Lens, Grid, etc.) and gels (Diffusion, CTO/CTB, CTS, +- Green, and dozen of effects). All results have been experimentally verified with a light meter in rental shops. Predilux does not rely on constructor’s data. IMPORTANT NOTICE: Predilux is switching its pricing model to a monthly subscription. Starting Sept 1st 2023, Predilux will cost $14.99/year or $1.49/mo (cancel anytime). If you buy Predilux now, you will be eligible for 2 years free. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
CheckMarked
Organize your thoughts and tasks using Markdown in a sleek, modern interface. Seamlessly integrate your notes with Obsidian for enhanced productivity.
- Markdown list support
- Clean, modern iOS interface
- Obsidian integration
- Task organization
- Note-taking
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CheckMarked lets you keep your lists in Markdown while presenting a clean, modern, iOS interface. Perfect for integrating with Obsidian.
Screenshots
Verdict
The clearest difference is rating: CheckMarked at 5.0 against Predilux's 3.5. CheckMarked also leads on in-app purchases (none vs 1) and update cadence (every 3 weeks vs every 4 months). Predilux's advantage is iOS requirement (12.0 vs 26.0). On price, ratings volume, 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
Both are free to download. Predilux sells 1 in-app purchase, starting at $14.99 per year. CheckMarked asks for nothing beyond the download.
CheckMarked holds the better App Store score, 5.0 against 3.5. Both are backed by a comparable volume of ratings — 2 and 3 respectively.
Predilux ships an update every 4 months, CheckMarked every 3 weeks. The most recent releases landed on September 9, 2026 and June 1, 2026 respectively.
| Parameter | Predilux | CheckMarked |
|---|---|---|
| Price | Free | Free |
| Rating | 3.5 (2 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 20.0% of reviews | — |
| Number of ratings | 2 | 3 — better |
| Update frequency | Every 4 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Subscription | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 12.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 69 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | WID LLC | David Powers |
Customer experience
Predilux
CheckMarked
In-app purchases
Predilux
- Predilux$14.991 Year
CheckMarked
No in-app purchases
