Comparison

myLightMeter PRO vs UnionDocs

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

myLightMeter PRO

This app provides precise exposure measurement for photographers, offering both incident and reflected light metering. It allows full manual control over exposure settings and includes advanced tools like a hyperfocal-distance calculator and configurable presets. Readings can be organized into sessions and synced via iCloud.

Highlights
  • Incident and reflected-light metering
  • Full manual exposure control
  • Long exposure and low-light sensitivity
  • Session organization and iCloud sync
  • Hyperfocal-distance calculator
  • Configurable presets
Features
Read full description

Designed by a photographer, for photographers. Built for reliable, precise exposure measurement across film and digital workflows. myLightMeter PRO gives you full control over exposure through a clean, professional set of tools. Key Features • Incident and reflected-light metering • Classic and Pro interface styles • Full manual control over aperture, shutter speed, ISO, and exposure compensation in 1/3- or 1/2-stop increments • Exposure range from 4 hours in Long Exposure mode to 1/8000 s, f/1.0 to f/512, and ISO 0.8 to 409,600 • Aperture-priority (Av) and shutter-priority (Tv) modes • Automatic ISO adjustment or ISO lock • Reciprocity correction for long film exposures • Sensitivity down to −2.5 EV, ideal for low-light scenes • Average multiple readings • Import shutter speed, aperture, and ISO from photos in your library • Organize readings into Sessions with photos, exposure data, camera and lens details, and notes • Keep your Sessions synced through iCloud, so they remain available when you switch phones or use another device • Export Sessions as PDFs or print them Advanced Tools • Hyperfocal-distance calculator • Five configurable presets, each storing camera, lens, ISO, filter, and film settings • EV display with an analog scale or numerical reading • mySPOTMETER and f/Tools integration About This app is built and maintained by an independent photographer and developer. It is the tool I personally use and continuously refine. If you have suggestions or need support, contact me at: davidquiles@me.com

About

UnionDocs

Access experimental nonfiction programs, documentary screenings, and live events from a global community. Engage in discussions with artists and thinkers, and enjoy exclusive member benefits for IRL events.

Highlights
  • Stream curated documentary programs
  • Access live events and screenings
  • Listen to masterclasses and workshops
  • Participate in study groups
  • Get free admission to IRL events
  • Connect with a global community
Features
Read full description

Become a member and stay tuned into all things UnionDocs from anywhere around the world. We’re a curious community that asks what we can do and undo together through a set of exciting, experimental nonfiction programs. We’re always generating new ideas, and bringing folks together to deconstruct them. It’s a rich and vibrant space where storytelling, visual experimentation, journalism, politics, activism and poetry intersect. Peek in the window of our bustling three story building in NYC and tune into the ideas and energy bubbling up at UnionDocs. Stream cutting-edge, powerful and poetic documentary programs and connect to conversations with the artists and thinkers passing through. Link up with UnionDocs and a wide range of collaborators, from our closest neighbors to the most exciting festivals and cultural spaces around the world. 5 top reasons to join the UNDO community! Stream incredible stuff! Watch curated programs, UNDO productions, and live events from the comfort of your home. Listen and learn! Eavesdrop on our Labs & Workshops with masterclasses from the top voices in documentary. Participate in the debate! Attend monthly Study Groups that feature international artists & thinkers in a dynamic conversation. Swing by our spot! Get free admission to IRL events and discounts for your friends, with an annual membership. Meet fun, smart people! Find a community invested in urgent expressions of the human experience, practical perspectives on the world today, and compelling visions for the future. We operate with confidence in the idea that documentary art, when paired with thoughtful context and open debate, is an invaluable tool for understanding the complexities of contemporary life and creating a more just and equitable society. Show your support. Become a member, and start UN-DO-ING today! ----- https://uniondocs.org/terms-conditions/ https://uniondocs.org/privacy_policy/

Screenshots

myLightMeter PRO4 screens
UnionDocs4 screens

Verdict

The call

The clearest difference is price: UnionDocs at Free against myLightMeter PRO's $4.99. UnionDocs also leads on rating (5.0 vs 4.8) and device support (3 vs 1). myLightMeter PRO's advantage is update cadence (every 5 days vs every 2 months) and ratings volume (1.2K vs 1). On 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

CostPrice · In-app purchases · Ads · Monetization

UnionDocs is free to download; myLightMeter PRO costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

UnionDocs holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: myLightMeter PRO has 1.2K ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

myLightMeter PRO ships an update every 5 days, UnionDocs every 2 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

Scorecard8 real differences · 3 level
myLightMeter PRO versus UnionDocs: the parameters behind the verdict, then further details
ParametermyLightMeter PROUnionDocs
Price$4.99Free — better
Rating4.8 (1.2K ratings)5.0 (1 ratings) — better
Positive reviews90.3% of reviews—
Number of ratings1.2K — better1
Update frequencyEvery 5 days — betterEvery 2 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
Best chart rank#25 — better—
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS17.015.0 — better
Further details — not scored
Size98 MB64 MB
Age rating4+12+
DeveloperDavid QuilesUnionDocs, INC

Customer experience

myLightMeter PRO

All ratings1,166 ratings
Positive96.0%
Neutral1.4%
Negative2.7%
Written reviews661 reviews
Positive90.3%
Neutral2.4%
Negative7.3%

UnionDocs

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

myLightMeter PRO

Reported bugs

3 issues
  • Crashes on startup
  • Inconsistent behavior between free and pro versions
  • Incorrect shutter speed and aperture options for some cameras

Requested features

4 requests
  • Ability to lock shutter speed and aperture
  • Smaller spot metering area
  • Support for more film/sensor formats
  • Improved incident metering with diffuser

UnionDocs

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

myLightMeter PRO

No in-app purchases

None

UnionDocs

No in-app purchases

Questions

Is myLightMeter PRO free?
myLightMeter PRO costs $4.99, with no in-app purchases.
Is UnionDocs free?
UnionDocs is free to download, with no in-app purchases.
Which has better reviews, myLightMeter PRO or UnionDocs?
UnionDocs is rated higher. myLightMeter PRO averages 4.8 out of 5 from 1.2K ratings, while UnionDocs averages 5.0 from 1 ratings.
Do myLightMeter PRO or UnionDocs have ads?
Neither myLightMeter PRO nor UnionDocs shows ads.
Which is updated more often, myLightMeter PRO or UnionDocs?
myLightMeter PRO ships an update every 5 days, and UnionDocs every 2 months. Most recently, myLightMeter PRO was updated on November 1, 2026 and UnionDocs on November 3, 2026.

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