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Free versus paid screen filters: compare the actual license cost

Written by Tap Zap Published Updated Research checked
Our recommendation

For basic warmth, start free: Night Shift on Mac, Night light on Windows, or a suitable native Linux feature. f.lux and LightBulb add free customization. A paid license makes sense only when its extra control works and is worth its actual package cost.

Disclosure: We make Tap Zap. Recommendations are our editorial judgment from documented capabilities, pricing, and compatibility limits. We recommend competitors when they fit the job better.

The shortlist, by need

These are recommendations for different jobs, rather than an overall score or a laboratory ranking.

Mac: included basic warmth

Apple Night Shift

Included with supported Macs

Built-in warmth adjustment with manual and scheduled activation

Apple Night Shift guide

Windows: included basic warmth

Windows Night light

Included with Windows 10 and 11

Built-in warmth strength, sunset scheduling, and custom hours

Microsoft Night light and display guide

Free personal-use scheduling

f.lux

Free for personal use

Time-of-day color transitions, app exclusions, and special color modes

f.lux product page · f.lux FAQ and licensing · f.lux Windows features · f.lux Mac guide

Free Windows customization

LightBulb

Free; source available under MIT license

Gamma transitions, manual or solar schedules, app whitelist, and hotkeys

LightBulb features and releases · LightBulb MIT license

Lower one-device Pro upfront cost

Iris

Pro $14.99; subscription $1.99/month

Color and software brightness controls with many modes and advanced options

Iris product page · Iris pricing and license terms · Iris external-monitor guide

Three-device package with lifetime updates

Tap Zap

$39 USD one-time

Warmth, software brightness, and DAY / EVENING / NIGHT presets

Tap Zap product page · Tap Zap FAQ · Tap Zap downloads · Tap Zap refund policy

Compare edition, device count and updates together

Listed USD amounts below describe the reviewed packages, not a universal checkout total. Taxes, localization and current terms can differ. A low single-device price and a larger bundled license answer different needs. Iris terms Tap Zap license

OptionListed packageUseful cost question
Night Shift / Night lightIncluded on supported systemsDoes basic warmth already cover the whole job?
f.luxFree personal use; deployment terms differIs this individual use or centrally managed workplace use?
LightBulbFree Windows app; MIT sourceDo its whitelist and hotkeys meet the need?
Iris mini Pro$9.99; different product from Iris ProAre the mini controls sufficient?
Iris Pro$14.99, one device at a time; minor builds/bug fixes included, program updates excludedDo you need one working device or future program versions?
Iris subscription$1.99/month; future versions includedWhat time period and current subscription terms are relevant?
Tap Zap$39 USD once; three devices and lifetime updatesWill you use the controls and the available seats? No free desktop trial.
Compare the cost of the required job
Compare the requirement and license terms before paying. This is a purchase checklist, not measured market data. View image at full size.

Work the device example without hiding the upfront cost

For one device, Iris Pro’s listed $14.99 is below Tap Zap’s $39 package. For three simultaneous devices, three Iris Pro licenses would total $44.97 at the listed price, while one Tap Zap package is $39. The update terms and required features still differ; this arithmetic does not make either product better. Three free installations cost no license fee if those tools meet the task.

For example, a Windows desktop plus a Mac laptop can use LightBulb and Night Shift for free. Tap Zap can cover both within three seats, but you still pay $39 upfront. Treat an unused third seat as available capacity, not money saved against a purchase you never needed.

Name the paid job before opening checkout

Useful reasons to pay include a preferred image-dimming workflow, advanced tools you actually use, or a verified display path that free options do not cover. Read Tap Zap vs Iris for tools/terms, Tap Zap vs f.lux for free dimming/red modes, and Tap Zap vs LightBulb for exclusions and shortcuts.

Use the Mac or Windows guide to select compatible candidates. Software dimming has tonal and display-path tradeoffs; a price alone does not establish optical or medical superiority.

A refund policy is different from a free trial

Tap Zap has no free Mac/Windows trial and publishes a 30-day refund policy. Read it before buying. Some affected M5 Pro/Max setups remain unresolved, and Linux is a separate free experimental beta. Do not spend expecting a compatibility fix that has not been established. Tap Zap refund policy

  1. Test the included/free option against one specific daily task.
  2. Identify the missing feature and the exact paid edition that provides it.
  3. Check device count, updates, compatibility and refund terms.
  4. Keep the free setup if the paid workflow does not add reliable value.

Sources and scope

Researched on 3 October 2026 using official product pages and documentation. Tap Zap’s maintained source was also checked for its controls and known compatibility limits. We did not conduct controlled hardware, medical, or performance tests for this article. Prices and features can change; confirm current terms before purchase.

Known Tap Zap limitation: some M5 Pro/Max configurations remain unresolved. Mac/Windows has no free trial; see the FAQ and refund policy. The Linux edition is a separate free experimental beta.

Keep comparing

If the workflow fits

See Tap Zap on your setup.

Check requirements and installation details before choosing the paid Mac/Windows edition. A free option may cover everything you need.

Check downloads & compatibility ↗See pricingRead refund terms