# Isolux

> Pop one color, grey the rest

- Product page: https://obelisk.club/selectivecoloreffect
- Platforms: iPhone
- Release status: live
- Last updated: 2026-07-30T06:43:49Z
- Pricing: Free (USD 0)
- Download (iPhone): https://apps.apple.com/app/id6792707497
- Publisher: Obelisk Club (https://obelisk.club) — local-first, privacy-respecting apps built in native Swift

## About

Isolux makes one colour pop while turning everything else to greyscale — in seconds, entirely on your device.

Pick a photo, drag the colour wheel to the hue you want to keep, and watch the selective colour effect appear in real time. Tap a preset (Red, Orange, Gold, Green, Sky, Purple) for instant results. Adjust the range slider to widen or narrow the preserved colour band. Toggle before/after to compare. Share directly to any app.

— WHAT MAKES ISOLUX DIFFERENT —
• Tactile colour wheel
  Drag around the wheel to pick exactly the hue you want to keep.
• Real-time preview
  The selective colour effect appears as you drag — there is no render step to wait through.
• Six one-tap presets
  Red, Orange, Gold, Green, Sky, and Purple are a single tap away.
• Adjustable hue range
  Widen or narrow the preserved colour band until only what you meant stays in colour.
• Before/after and instant sharing
  Toggle the comparison to check your work, keep an edit history, and share straight to any app.
• Fully offline
  Every step runs locally — no account, no cloud upload, no internet required.

— WHO IS ISOLUX FOR? —
• Photographers who want one subject to carry the whole frame
• Anyone making a poster, cover, or post that needs a single accent colour
• People who want the look in seconds rather than in a layered editor
• Privacy-minded users who would rather their photos stayed on the device

— PRICING —
Included: the colour wheel, six one-tap presets, adjustable hue range, real-time preview, before/after comparison, edit history, and sharing to any app.
Isolux Pro is a one-time in-app purchase — no subscription — and adds batch processing of up to 20 photos at once, saving to Photos at full original resolution, and unlimited edit history.

— FEEDBACK —
Made by a small indie team. Email obeliskclubclub@gmail.com with feedback, bug reports, or feature requests.

Learn more: obelisk.club/selectivecoloreffect

Terms of Use (EULA): https://obelisk.club/selectivecoloreffect/terms

## Key features

- **Tactile colour wheel — drag to pick any hue**
- **Real-time selective colour preview**
- **Six one-tap hue presets**
- **Adjustable hue range slider**
- **Pro: batch process up to 20 photos (requires in-app purchase)**
- **Fully offline — no account, no cloud**