Appworthy

f/ Tools: Photo Calculator

Best photography calculator

David Quiles
Download on theApp Store
App Store rating3.7★6 ratings
Price$3.99Listed price
Age4+Store age rating
Size5 MBiPhone download
CategoryPhoto & Video
DeveloperDavid Quiles

What we found

Full report

Too little checked to say Store information only. We haven’t analysed this app or read its reviews yet.

Money

  • $3.99 to download.

Not yet tested.

The store currently lists version 3.0, updated 2026-10-16.

Preview

Screenshot 1Screenshot 2Screenshot 3Screenshot 4Screenshot 5Screenshot 6Screenshot 7Screenshot 8

Store screenshots supplied by the developer.

About this app

f/Tools is a toolkit for digital and film photography.

Explore depth of field, compare defocus across lenses, and try different shutter speeds before you shoot. Plan your prints and calculate flash exposure, with interactive diagrams that make photographic concepts easier to understand.

Features:

• Depth of field and hyperfocal distance

See near and far focus limits and how they change with aperture, focal length, and focus distance.

• Defocus comparison

Explore how focal length, aperture, and subject distance affect blur, with a magnifier for a closer look.

• Freeze motion

Calculate the shutter speed needed to limit motion blur based on subject speed, distance, and focal length.

• Motion blur

Try different shutter speeds and visualize the resulting motion trail.

• Diffraction and resolution

Explore Airy disc size and estimated effective resolution as you change the aperture.…

From the developer’s store description.

For developers and the curious

The full report

The evidence, sources, measurements and versions behind every label above.

Findings and evidence

Not yet tested
Not yet tested. No analysis has been published for this app. A missing label is not a clean bill of health.

What reviewers report

No review coverage

No review analysis published for this app.

Measurements

3 measured · 5 not assessed

“Not assessed” means we could not measure it. It is never a zero and never a pass.

From store data and reviews

Developer replies to reviews
Not assessed
Fewer than 50 reviews scanned — too few to state a rate
Price in the store description
The store description doesn’t list prices (most don’t)
Cancelling, in the store description
The store description doesn’t say how to cancel (most don’t)
Themes reported by reviewers
Not assessed
This app's reviews have not been assessed yet
Five-star share of ratings
Under 65% five-star
Arithmetic on the stores' own published rating counts. It says nothing about why the ratings fall where they do.

In the app package we scanned

No package has been scanned for this app, so nothing is published about what it ships. That is an absence of evidence, not a finding.

Sensitive permissions
Not assessed
No package has been scanned for this app
Analytics or tracking SDKs in the scanned package
Not assessed
No package has been scanned for this app
Advertising SDKs in the scanned package
Not assessed
No package has been scanned for this app
How we know

Supporting measurements: not a complete list of possible harms or positives. Measurement vocabulary 1.4 · how these are measured

Versions and dates analysed

Not yet tested

Not yet tested. No analysis has been run for this app, so there is no version or date to report.

Store update history

Each store’s release notes, as the developer wrote them. They are the developer’s words, not ours.

App Store

Version 3.0 · 2026-10-16
NEW • Motion Blur tool: explore how shutter speed affects motion trails. • Dark Mode. IMPROVED • Redesigned Defocus tool to compare subjects at different distances. • Redesigned Flash tool with clearer exposure information at different distances. • Clearer depth-of-field display. • Improvements to the Freeze Motion tool. • Automatic scaling for distance diagrams, without needing to pinch to zoom. • Interface adapted for iPhone Duo and iPad. • Interface refinements for easier use. • Clearer in-app help. FIXED • Cropped film formats now work correctly in print mode without changing the print size. • Editable values can now be edited with a single tap. • Layout issues on some screen sizes.

Assessment record

Status
Not yet tested
App identifier
f-tools
Sources used
None recorded
Reviews read
None recorded
Package examined
No package scan
Human inspection
Not completed
How we know
Measurement vocabulary
1.4

Store facts

App Store

What the stores publish. Store ratings are the stores’ numbers, not Appworthy’s, and are never averaged across stores.

App Store

Store rating
3.67 ★ · 6 ratings
Version
3.0
Updated
16 Oct 2026
Price
$3.99
Age rating
4+
Size
5 MB
Open in App Store
Developer
David Quiles
Category
Photo & Video
Listing price
$3.99

No itemized purchase list is available for this listing.

Method and limits

What this report can and cannot show

What a missing label means

Not yet tested. No analysis has been published for this app, so there is no method to describe for it yet. A missing label is not a clean bill of health: it means nothing has been read, not that nothing is wrong.

Limits of this report

  • A package scan is static. It identifies code and text in one Android build. It does not measure a live ad session, test a deletion request, or count the steps needed to cancel.
  • Reviews keep their sample. A review-only charge shows distinct reviewers, the share and the sample size, and is published only once it clears that label’s published threshold. Calibration labels are machine-drafted and not yet confirmed by a person.
  • Not assessed is a state. It is never a zero and never a pass.
  • A missing label is not a clean bill of health. It means the evidence did not support one, not that the app is problem-free.
Not yet human-reviewed. A human review gives an app hands-on, recorded measurements. None has been run for this app. Hands-on inspections are not yet open.
Review thresholds Read the methodology For developers

Request a correction

[email protected]

Write to [email protected], or use the form. Name the finding, the app version and the evidence that needs correcting. Factual corrections are free and never depend on buying anything.

Report a factual error — free Email a correction