Comparison

Celer vs Sightlines

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

Head to head
About

Celer

Enhance your reading speed, focus, and comprehension with a scientifically-backed method. This app offers an immersive environment and assistive technology to help you absorb information faster and retain it better. It's an essential tool for students, professionals, and individuals with neurodivergent reading needs.

Highlights
  • Read 2-3x faster
  • Sharpen focus with immersive environment
  • Boost memory and retention
  • Assistive tool for ADHD & Dyslexia
  • Import EPUB, PDF, mobi, rtf, txt
  • Read articles and web content
  • Customizable themes
Features
Read full description

Ever finish a page and realize you remember nothing? Read the same sentence three times and still lose your place? Celer was built for exactly that. Celer guides your eyes through the text with subtle highlighting, so your attention has a track to follow. Readers with ADHD and dyslexia tell us it's the difference between fighting a page and finishing it. HOW IT HELPS • Guided highlighting keeps your place — no more re-reading the same line • Adjustable pace: the text moves with you, not against you • Distraction-free reading screen, tuned for focus • Comprehension grows because your attention stays where the words are YOUR LIBRARY, YOUR WAY • Import EPUB, PDF, MOBI, RTF and TXT • Massive free classics library, ready to read • Follow articles and news with built-in RSS • Highlights and notes that stay with your books PRIVATE BY DESIGN No accounts required, no personal data collected. Your reading stays yours. Whether you have ADHD, dyslexia, or just a phone full of distractions, Celer helps you actually finish what you start. Try it free. Celer is an assistive reading tool, not a medical device or treatment. https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Sightlines

Features
Read full description

Read faster and retain more with Sightlines—the speed-reading app powered by Rapid Serial Visual Presentation (RSVP) techniques. Traditional reading wastes up to 80% of your time on eye movement alone. Sightlines displays one word at a time in a fixed position, delivering text directly to your brain's optimal recognition point. The result? Reading speeds up to 800 words per minute with less eye strain and deeper focus. Speed Read Anything: • Import ePubs or PDFs from your files • Share documents directly to the app • Save articles instantly from any URL • Paste text directly for immediate reading • Sample content included to get started RSVP Technology That Works: • One word at a time display eliminates eye movement • Optimal Recognition Point (ORP) highlighting for faster processing • Adjustable speeds from 100 to 800 WPM • Smooth speed transitions while reading • Context view shows surrounding sentences when paused Track Your Reading Progress: • Detailed analytics: words read, sessions, and actual WPM achieved • Daily, weekly, monthly, and all-time statistics • Visual charts show your speed improving over time • Reading streaks keep you motivated and consistent • Automatic progress saving—pick up exactly where you left off Personalized Reading Experience: • 6 themes: Dark, Light, Sepia, Night, Paper, and System • Each book remembers your preferred reading speed • Chapter navigation for ePub books • Distraction-free, full-screen reading mode Who Is Sightlines For?: • Students tackling heavy reading loads • Professionals staying current with articles and reports • Book lovers who want to read more in less time • Anyone looking to improve focus and reduce screen fatigue Stop moving your eyes. Start moving through your reading list. Use of this app is subject to Apple's Licensed Application End User License Agreement: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Celer4 screens
Sightlines4 screens

Verdict

The call

The clearest difference is update cadence: Sightlines at every 4 days against Celer's every 10 days. On price, ads, in-app purchases and device support 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. Celer sells 4 in-app purchases, starting at $7.99 per month and Sightlines sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Celer ships an update every 10 days, Sightlines every 4 days. The most recent releases landed on September 21, 2026 and September 16, 2026 respectively.

Scorecard1 real difference · 9 level
Celer versus Sightlines: the parameters behind the verdict, then further details
ParameterCelerSightlines
PriceFreeFree
Rating4.0 (21 ratings) — better—
Positive reviews57.1% of reviews—
Number of ratings21 — better—
Update frequencyEvery 10 daysEvery 4 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium—
DevicesiPhone, iPad — betteriPhone
Requires iOS17.0 — better17.6
Further details — not scored
Size62 MB12 MB
Age rating4+4+
DeveloperMobile Craft MBKyle Foley

In-app purchases

4 purchases

Celer

Subscriptions4
  • Premium month$7.991 Month
  • Premium quarter$17.993 Months
  • Premium Year7 Days trial$34.991 Year
Show 1 more
  • Premium Year Plan$79.991 Year
2 purchases

Sightlines

Subscriptions2
  • Sightlines Pro Monthly$2.991 Month
  • Sightlines Pro Yearly$19.991 Year

Questions

Is Celer free?
Celer is free to download, with in-app purchases available.
Is Sightlines free?
Sightlines is free to download, with in-app purchases available.
Do Celer or Sightlines have ads?
Neither Celer nor Sightlines shows ads.
Which is updated more often, Celer or Sightlines?
Celer ships an update every 10 days, and Sightlines every 4 days. Most recently, Celer was updated on September 21, 2026 and Sightlines on September 16, 2026.

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