f.lux
f.lux is a cross-platform computer program that adjusts your display's color temperature according to location and time of day to reduce eye strain and improve sleep quality.
Speechify
Speechify is a versatile text-to-speech software that converts documents, articles, and PDFs into natural-sounding audio to help you listen to your reading material on any device.
Quick Comparison
| Feature | f.lux | Speechify |
|---|---|---|
| Website | justgetflux.com | speechify.com |
| Pricing Model | Free | Freemium |
| Starting Price | Free | Free |
| FREE Trial | ✘ No free trial | ✓ 3 days free trial |
| Free Plan | ✓ Has free plan | ✓ Has free plan |
| Product Demo | ✘ No product demo | ✓ Request demo here |
| Deployment | ||
| Integrations | ||
| Target Users | ||
| Target Industries | ||
| Customer Count | 0 | 0 |
| Founded Year | 2009 | 2017 |
| Headquarters | Los Angeles, USA | Miami, USA |
Overview
f.lux
f.lux is a display management tool designed to align your screen's brightness and color with your internal biological clock. During the day, your screens look like sunlight, but as the sun sets, the software automatically transitions your display to a warmer, amber hue. This shift mimics indoor lighting and reduces the blue light exposure that often interferes with your sleep patterns and causes digital eye strain.
You can customize the experience by telling the software exactly what kind of lighting you have and where you live. It then handles the transitions automatically, so you never have to manually adjust your monitor settings as evening approaches. It is a set-it-and-forget-it solution for anyone who spends long hours in front of a computer, especially during late-night sessions.
Speechify
Speechify helps you turn any written text into high-quality audio so you can listen while you commute, exercise, or multi-task. Whether you are dealing with a long PDF for work, a physical book you need to scan, or a web article, you can instantly transform it into a spoken track. It uses advanced AI to provide human-like voices that make listening feel natural rather than robotic.
You can adjust reading speeds up to 4.5x to power through content faster or slow it down to aid comprehension. The platform is designed for students, professionals with heavy reading loads, and individuals with dyslexia or visual impairments. By syncing across your phone and computer, you can start a document at your desk and finish it on your walk using the mobile app.
Overview
f.lux Features
- Adaptive Color Tones Automatically transition your screen from cool daylight tones to warm indoor colors as the sun sets in your specific location.
- Location-Based Timing Enter your coordinates or zip code so the software can precisely calculate sunrise and sunset times for your exact area.
- Custom Color Profiles Choose from various presets like 'Reduce Eyestrain' or 'Classic f.lux' to find the exact warmth level that feels best for you.
- Movie Mode Preserve colors and shadow detail while watching films with a specialized setting that maintains a balanced look for media.
- Darkroom Mode Turn your entire screen red and black to preserve your night vision and eliminate blue light entirely in dark environments.
- Smart Lighting Control Connect your smart home bulbs to the software to synchronize your entire room's lighting with your computer screen's color.
Speechify Features
- Optical Character Recognition. Snap a photo of any physical book page or document to instantly convert the printed text into clear audio.
- Variable Reading Speed. Adjust the playback speed up to 900 words per minute to finish your reading list in record time.
- Natural AI Voices. Listen to high-quality, human-like voices, including celebrity narrators, that make long listening sessions more engaging and less fatiguing.
- Cross-Platform Syncing. Save your library to the cloud and switch between your browser, iPhone, and Android device without losing your place.
- Active Text Highlighting. Follow along visually as words are highlighted in real-time, helping you improve your focus and information retention.
- Browser Extension. Listen to any website, Gmail inbox, or Google Doc directly from your Chrome browser with a single click.
Pricing Comparison
f.lux Pricing
- Full automated color shifting
- Location-based transitions
- Customizable color presets
- Movie and Darkroom modes
- Smart bulb integration
- Everything in Personal, plus:
- Legal use for organizations
- Support for the developers
- One-time payment options
- Volume licensing available
Speechify Pricing
- 10 standard reading voices
- Listen at up to 1x speed
- Listen to any PDF or text
- Standard mobile app access
- Chrome extension support
- Everything in Limited, plus:
- 30+ high-quality premium voices
- Scan and listen to printed text
- Listen at up to 4.5x speed
- Advanced skipping and importing
- Priority customer support
Pros & Cons
f.lux
Pros
- Completely free for personal use
- Extremely lightweight on system resources
- Significant reduction in late-night eye strain
- Set-it-and-forget-it automation works reliably
Cons
- Can interfere with color-accurate design work
- Occasional flickering during transition periods
- Interface feels slightly dated compared to modern apps
Speechify
Pros
- Extremely natural sounding voices reduce listening fatigue
- Syncs perfectly across mobile and desktop devices
- Helps users with dyslexia stay focused on reading
- Scanning physical books works with high accuracy
- High-speed playback saves significant time on research
Cons
- Premium subscription requires a large annual upfront payment
- Free version has very limited voice options
- Occasional glitches when processing complex PDF layouts