Comparison

CalcuLight vs Glitchforge

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

Head to head
About

CalcuLight

This app provides advanced light metering for film photographers, offering multiple metering modes and exposure control options. It helps users achieve precise exposures for their shots, with features like Zone System display and a log book for tracking. A free version is available, with an optional Pro upgrade for more advanced tools.

Highlights
  • Center Weighted metering
  • 3D Matrix metering
  • Spot metering (Pro)
  • Calculated metering (Pro)
  • Shutter Priority metering
  • Aperture Priority metering (Pro)
  • Zone System overlay (Pro)
  • Log book with GPS (Pro)
Features
Read full description

CalcuLight is a powerful, intuitive light meter for film photographers who want more than a handheld meter can offer. METERING MODES Center Weighted: Classic center focused metering (approximately 30 degree field of view), similar to vintage film cameras. Matrix: Full frame averaging for tricky scenes. Uses your camera's EXIF data for the fastest possible readings. Spot (Pro): Measure a precise 5% area of the frame. Tap anywhere to position the metering point. Calculated (Pro): Tap up to five areas and receive an averaged reading. Ideal for high contrast scenes and Zone System workflows. EXPOSURE COMBINATION SCALE Instead of a single pair of numbers, the readout shows a scale of equivalent exposures, so you can see at a glance that 1/125 at f/5.6 matches 1/250 at f/4. Swipe to scroll through combinations, or tap one to switch instantly. Combinations your camera cannot reach are flagged before you commit. EXPOSURE CONTROLS Shutter Priority: Set your shutter speed. CalcuLight calculates the aperture. Aperture Priority (Pro): Set your aperture. CalcuLight calculates the shutter speed. EV Compensation: Per shot adjustment in full, half, or third stops. ISO, shutter, and aperture (Pro) values in full, half, or third stop increments. Camera Range Limits (Pro): Restrict ISO, shutter and aperture to what your gear can actually do. Apertures reach f/0.7 for fast optics like the Noctilux. SHOOTING PROFILES (Pro) Save a named setup for how you are actually shooting: the film, how you are rating it, and the filter on your lens. Push and pull in third stops, up to three either way. Push two stops on ISO 400 film and CalcuLight meters it as EI 1600. Filter compensation up to ten stops, from a yellow filter to an ND10. Switch setups from the viewfinder. The active profile is always shown on screen, so a reading is never quietly adjusted without you seeing why. ZONE SYSTEM VALUE DISPLAY (Pro) Displays the current zone from 0 to X beside your metering point. In Calculated mode, each point shows its own zone value. LIVE HISTOGRAM (Pro) Real time RGB histogram to catch clipped highlights and blocked shadows before you shoot. Toggle combined RGB, red, green, and blue channels. LOG BOOK (Pro) Save every reading with full exposure data, metering mode, GPS location (choose precise or general) and timestamp. Notes are pre-populated with captured values in Calculated mode. Export as CSV, JSON, or plain text. MULTI-LANGUAGE SUPPORT English, 简体中文, 繁體中文, 日本語, 한국어, हिन्दी, Русский, Deutsch, Français, Español, Português, Nederlands FREE vs PRO The FREE version is completely ad-free and covers over 90% of what film shooters need for exposure metering. Free version features: Center Weighted and Matrix metering Shutter Priority metering Exposure combination scale EV compensation Single metering mode ISO, shutter and EV compensation stop increments Light and dark themes Portrait and landscape with orientation lock Overlay transparency All 12 languages Pro version: All free version features Spot metering with adjustable area Calculated metering Aperture Priority metering Shooting profiles with push/pull and filter compensation Vintage camera shutter speed options Zone System overlay Live histogram Log book with optional GPS location recording Continuous metering mode Global EV offset Exposure settings range limits Aperture stop increment control cd/m2 display Remember settings between sessions Silent metering (turn off the meter beep) Experimental features (lens switch) You can try Pro version at no cost for 14-days. After that, you can access the Pro version in two ways: Pay as you go for only $0.99 USD per month to access all Pro features (cancel any time); or $14.99 USD for lifetime access to all Pro features and future updates. Privacy Policy: https://calculight.ocutrain.com/privacy-policy.html Terms of Service: https://calculight.ocutrain.com/terms-of-service.html

About

Glitchforge

Features
Read full description

Glitchforge is a video glitch studio that runs on your iPhone. Load a clip, stack effects, and watch your videos get messed up. Most glitch apps just paint effects on top of the picture. We edit the compressed video itself, in its own domain: the motion vectors, coefficients, and quantizers inside the H.264, MPEG-2, and MPEG-4 streams. Datamosh: motion comes unstuck from the picture, so one shot melts into the next and frames bleed together. Scrambled coefficients: blocks tear and smear. Warped blocks + posterization: the compression math is the effect. VHS + analog: tracking noise, color bleed, worn tape Pixel sort: pixels dragged into long streaks of color. Load a clip. Build a chain and reorder it if you need to. Tune each effect's settings and watch the picture change in unexpected ways. Scrub to any frame and save it, or export the whole clip. There is no account and no server. Your footage is processed on the phone and stays there. It works with no connection, anywhere you are ready to make art.

Screenshots

CalcuLight4 screens
Glitchforge4 screens

Verdict

The call

The clearest difference is in-app purchases: Glitchforge at none against CalcuLight's 2. Glitchforge also leads on update cadence (every 8 days vs every 4 weeks). CalcuLight's advantage is device support (3 vs 1) and iOS requirement (15.1 vs 17.0). On price and ads 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

Both are free to download. CalcuLight sells 2 in-app purchases, starting at $0.99 per month. Glitchforge asks for nothing beyond the download.

UpkeepUpdate frequency

CalcuLight ships an update every 4 weeks, Glitchforge every 8 days. The most recent releases landed on October 7, 2026 and October 3, 2026 respectively.

Scorecard4 real differences · 5 level
CalcuLight versus Glitchforge: the parameters behind the verdict, then further details
ParameterCalcuLightGlitchforge
PriceFreeFree
Rating5.0 (2 ratings) — better—
Number of ratings2 — better—
Update frequencyEvery 4 weeksEvery 8 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemium—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.1 — better17.0
Further details — not scored
Size40 MB150 MB
Age rating4+4+
DeveloperLi FanGreen Rose Systems, LLC

In-app purchases

2 purchases

CalcuLight

Subscriptions1
  • CalcuLight14 Days trial$0.991 Month
One-time1
  • CalcuLight$14.99
None

Glitchforge

No in-app purchases

Questions

Is CalcuLight free?
CalcuLight is free to download, with in-app purchases available.
Is Glitchforge free?
Glitchforge is free to download, with no in-app purchases.
Do CalcuLight or Glitchforge have ads?
Neither CalcuLight nor Glitchforge shows ads.
Which is updated more often, CalcuLight or Glitchforge?
CalcuLight ships an update every 4 weeks, and Glitchforge every 8 days. Most recently, CalcuLight was updated on October 7, 2026 and Glitchforge on October 3, 2026.

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