Comparison

Co vs Celeris

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

Head to head
About

Co

This AI-powered workspace acts as your intelligent assistant, streamlining tasks and boosting efficiency. Engage in natural conversations, generate content, organize information, and solve problems within a single, intuitive interface.

Highlights
  • AI Smart Chat
  • AI Writing and Content Generation
  • Productivity and Work Assistance
  • Clean and Efficient Interface
  • All-in-One AI Tools
Read full description

Co‑work is an AI workspace designed to improve efficiency, making AI your always-available intelligent assistant. With Co‑work, you can have natural conversations with AI, gain inspiration, generate content, organize information, and complete various tasks within a simple and efficient interface. Instead of switching between multiple tools, Co‑work integrates AI chat and practical tools into one platform, helping you stay focused and work more efficiently. Key Features: AI Smart Chat Communicate with AI anytime to get answers, inspiration, and suggestions. AI Writing and Content Generation Helps generate articles, emails, notes, copy, and social media content. Productivity and Work Assistance Organize ideas, create plans, solve problems, and improve work efficiency. Clean and Efficient Interface A simple and intuitive design that keeps you focused on thinking and creating. All-in-One AI Tools No need for multiple AI apps—Co‑work meets your daily AI needs in one place. Use Cases: Writing and content creation Learning and information organization Brainstorming and idea generation Improving work efficiency Solving everyday problems Whether you are a student, creator, or professional, Co‑work helps you complete your work more efficiently. Use AI to make work simpler. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Celeris

Enhance your reading speed and comprehension with a word-by-word visual presentation. Import your own content, customize your reading experience, and track your progress to become a more efficient reader.

Highlights
  • Rapid Serial Visual Presentation (RSVP)
  • Coasting mode with gliding lines
  • Import EPUB, plain text, and web articles
  • Automatic progress saving
  • Customizable reading speed up to 1000 WPM
  • Personalizable themes and fonts
  • Reading statistics and progress tracking
Features
Read full description

Read faster without skimming. Celeris uses RSVP (Rapid Serial Visual Presentation) to flash one word at a time in a fixed spot on screen, so your eyes never waste time scanning across lines. The result: you move through books and articles noticeably faster, with your focus locked in one place. Bring your own reading. Import EPUB and plain-text files, or paste in any web article and Celeris converts it into a clean, distraction-free read. The fastest way in is the share sheet — tap Share on a book or link in any app and send it straight to your Library. TWO WAYS TO READ • RSVP — a single word at a time in a fixed focus point, with a color-highlighted anchor letter to keep your eyes locked on. The fastest way to read. • Coasting — several lines glide gently upward past a highlighted focus line, auto-advancing at your pace. More context per glance when you want it. Switch between the two instantly from Quick Settings, without leaving your book. BUILT FOR REAL READING • Never lose your place — your position is saved automatically in every book. • Tap any word to jump straight to it, rewind 10 words, or restart the paragraph. • Jump to any chapter from the Table of Contents. • Highlight passages with a long-press-and-drag, add notes, and revisit them all later. • Fine-tune your pace: separate pauses for sentences, punctuation, long words, and paragraphs keep fast reading feeling natural. MAKE IT YOURS • Reading speed from a comfortable pace up to 1000 WPM. • Choose your accent color, page background (White, Off-White, Bone, Old Scroll, Pinkish), and anchor shape (Line, Dot, Heart, Diamond, Chevron, Bolt). • Adjustable font size for RSVP and Coasting alike. SEE YOURSELF IMPROVE • Track total reading time, words read, average pace, and your longest session. • Daily and weekly activity, a reading-activity heatmap, and a pace-over-time chart. • Build a daily reading streak and beat your best. FREE & PRO Celeris is free to start: keep up to 3 books, read up to 400 WPM, and track your time and streaks. Upgrade to Pro for unlimited books, speeds up to 1000 WPM, every color, background, and anchor shape, and the full Statistics dashboard. Celeris Pro is available as a monthly or annual subscription. Payment is charged to your Apple ID at confirmation. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period; manage or cancel anytime in your Apple ID settings. Privacy Policy: https://readceleris.app/privacy Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Co4 screens
Celeris4 screens

Verdict

The call

The clearest difference is in-app purchases: Celeris at none against Co's 3. Celeris also leads on iOS requirement (16.4 vs 18.0). On price, rating, ratings volume and update cadence 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. Co sells 3 in-app purchases, starting at $3.99 per 7 days. Celeris asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Co against 5.0 for Celeris. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

UpkeepUpdate frequency

Co ships an update weekly, Celeris every 9 days. The most recent releases landed on October 5, 2026 and October 10, 2026 respectively.

Scorecard2 real differences · 8 level
Co versus Celeris: the parameters behind the verdict, then further details
ParameterCoCeleris
PriceFreeFree
Rating5.0 (1 ratings)5.0 (2 ratings)
Positive reviews—100.0% of reviews
Number of ratings12 — better
Update frequencyWeekly — betterEvery 9 days
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPad, Mac — betteriPhone, iPad
Requires iOS18.016.4 — better
Further details — not scored
Size51 MB50 MB
Age rating12+4+
Developer晨越 唐HEXAGON WORKS LLC

Customer experience

Co

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Celeris

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

3 purchases

Co

Subscriptions3
  • weekly plan$3.997 Days
  • yearly_plan3 Days trial$39.991 Year
  • yearly_plan_fullprice$39.991 Year
None

Celeris

No in-app purchases

Questions

Is Co free?
Co is free to download, with in-app purchases available.
Is Celeris free?
Celeris is free to download, with no in-app purchases.
Which has better reviews, Co or Celeris?
Co and Celeris are both rated 5.0 out of 5 on the App Store, from 1 and 2 ratings respectively.
Do Co or Celeris have ads?
Neither Co nor Celeris shows ads.
Which is updated more often, Co or Celeris?
Co ships an update weekly, and Celeris every 9 days. Most recently, Co was updated on October 5, 2026 and Celeris on October 10, 2026.

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