Perfect Exposure vs ND Filter Calc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Perfect Exposure
This app assists photographers in calculating camera settings for various scenarios, including exposure time, time-lapse durations, and optimal settings for capturing sharp stars or star trails. It also helps determine depth of field and hyperfocal distance.
- Exposure time calculation
- Time-lapse planning
- Sharp star exposure limits
- Star trail calculation
- Depth of field calculation
- Hyperfocal distance
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• Exposure Perfect Exposure helps you calculate the exposure time when you change the aperture, ISO, or ND filters. • Time-lapse Perfect Exposure helps you plan a time-lapse shot by calculating the shooting duration and the final video duration. • Stars Perfect Exposure tells you maximum exposure time to produce sharp stars without trails. It includes the widely-used 600 Rule and 500 Rule, as well as the more accurate NPF Rule. • Star Trails Perfect Exposure calculates the angular length of the star trails within a certain period. It also shows an illustration of the actual scene.* • Depth of Field Perfect Exposure calculates the depth of field under certain focal length and aperture, as well as the hyperfocal distance. * The illustration does not reflect the actual position of stars in the sky.
ND Filter Calc
This tool helps photographers calculate neutral density filter effects on their camera's exposure. It includes a countdown timer for long exposures, simplifying the process of achieving desired results.
- Neutral density filter calculation
- Exposure compensation
- Long exposure timer
- Countdown for shutter speeds > 3 seconds
- Simple interface
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A simple neutral density filter calculator for photographers. Has a count-down timer for shutter speeds of 3 seconds and above.
Screenshots
Verdict
The clearest difference is update cadence: ND Filter Calc at every 6 days against Perfect Exposure's every 2 months. Perfect Exposure's advantage is iOS requirement (10.0 vs 15.0). On price, review sentiment, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
Perfect Exposure ships an update every 2 months, ND Filter Calc every 6 days. The most recent releases landed on October 24, 2026 and September 30, 2026 respectively.
| Parameter | Perfect Exposure | ND Filter Calc |
|---|---|---|
| Price | Free | Free |
| Rating | 3.3 (7 ratings) — better | — |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 7 — better | — |
| Update frequency | Every 2 months | Every 6 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 10.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 17 MB | 47 MB |
| Age rating | 4+ | 4+ |
| Developer | Haoyuan Xia | Jerry Watson |
Customer experience
Perfect Exposure
ND Filter Calc
In-app purchases
Perfect Exposure
No in-app purchases
ND Filter Calc
No in-app purchases
Questions
Is Perfect Exposure free?
Is ND Filter Calc free?
Do Perfect Exposure or ND Filter Calc have ads?
Which is updated more often, Perfect Exposure or ND Filter Calc?
Other comparisons
