Comparison

O3 vs Readrrr

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

Head to head
About

O3

This community app allows users to earn digital currency for purchases like food and drinks. It's the official platform for engaging with the O3space community and its offerings.

Highlights
  • Earn o-coins
  • Spend o-coins on food and drinks
  • Official community app
  • Exclusive offers
Features
Read full description

Giant 24/7 cafes you can unlock with one app. Study, work, hang out, and meet new people at O3! https://www.o3space.org/terms-of-use

About

Readrrr

Enhance reading speed and focus with a distraction-free experience. This app uses RSVP technology to display words sequentially, helping you process text faster and track your comprehension progress.

Highlights
  • RSVP speed-reading technology
  • Customizable reading speeds
  • Distraction-free reading environment
  • PDF import and text extraction
  • Reading progress tracking
  • Cross-device synchronization
Features
Read full description

Readrrr uses Rapid Serial Visual Presentation to show words one at a time in the same spot, and a natural voice can read each word aloud as it appears. Your eyes don't have to jump across lines, so you don't lose your place and read faster. Seeing and hearing every word at the same time also keeps your mind from drifting. Start at your normal pace and speed up as it gets comfortable. A Readrrr subscription or one-time purchase includes everything below: RSVP READER Every word has one letter marked in red for your eyes to rest on, so you never have to look for where the word starts. You can change the speed at any time. NARRATION Pick a voice and it reads along in sync with every word at any speed. The voice runs on your phone, so it works offline. SHORT READS Non-fiction you can finish in 10 to 20 minutes, on topics like history, health, science and economics. Each one is written to be read in Readrrr and sits in a collection with related reads. New ones come out every week, and you can suggest a topic. READ ANYTHING Import PDFs and EPUBs, send an article from Safari with one tap, paste text, or scan pages from a paper book. APP LOCKING Pick the apps that take up your day. Starting at 4 am they stay locked until you've read your daily word goal. Every day you hit it adds to your streak. If you really need one of them, you can unlock for 10 minutes once a day. HIGHLIGHTS Save any passage while you read. Readrrr sorts your highlights into themes and brings old ones back to you in the app and in a Home Screen widget, so you don't forget what you read. STATS Track your reading speed, words read and streak as they grow. SYNC Your library, reading position and stats stay in sync across your devices. SUBSCRIPTION Readrrr requires a subscription or a one-time purchase. Subscriptions renew automatically unless you cancel at least 24 hours before the current period ends. You can manage them in your App Store account settings. Privacy Policy: https://www.ocule.no/readrrr/privacy Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

O34 screens
Readrrr4 screens

Verdict

The call

The clearest difference is review sentiment: O3 at 91% against Readrrr's 29%. O3 also leads on monetization model (free with in-app purchases vs subscription) and iOS requirement (16.0 vs 18). On price, update cadence, ads and in-app purchases 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. O3 sells 1 in-app purchase, starting at $6.00 per 7 days and Readrrr sells 10 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

O3 ships an update every 9 days, Readrrr fortnightly. The most recent releases landed on October 7, 2026 and October 16, 2026 respectively.

Scorecard3 real differences · 7 level
O3 versus Readrrr: the parameters behind the verdict, then further details
ParameterO3Readrrr
PriceFreeFree
Rating—4.6 (22 ratings) — better
Positive reviews90.9% of reviews — better29.0% of reviews
Number of ratings—22 — better
Update frequencyEvery 9 days — betterFortnightly
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases — betterSubscription
DevicesiPhoneiPhone, iPad — better
Requires iOS16.0 — better18
Further details — not scored
Size139 MB138 MB
Age rating4+4+
DeveloperO3 Platforms LimitedOcule AS

Customer experience

O3

Written reviews11 reviews
Positive90.9%
Neutral9.1%
Negative0.0%

Readrrr

All ratings22 ratings
Positive90.9%
Neutral4.5%
Negative4.5%
Written reviews69 reviews
Positive29.0%
Neutral10.1%
Negative60.9%

In-app purchases

1 purchases

O3

Subscriptions1
  • 10HR COMBO$6.007 Days
10 purchases

Readrrr

Subscriptions9
  • Readrrr Monthly3 Days trial$2.991 Month
  • Weekly$2.997 Days
  • Weekly$4.997 Days
Show 6 more
  • Monthly$7.991 Month
  • Monthly$9.991 Month
  • Yearly$19.991 Year
  • Readrrr Yearly$24.991 Year
  • Yearly$29.991 Year
  • Yearly$39.991 Year
One-time1
  • Readrrr Lifetime$99.99

Questions

Is O3 free?
O3 is free to download, with in-app purchases available.
Is Readrrr free?
Readrrr is free to download, with in-app purchases available.
Do O3 or Readrrr have ads?
Neither O3 nor Readrrr shows ads.
Which is updated more often, O3 or Readrrr?
O3 ships an update every 9 days, and Readrrr fortnightly. Most recently, O3 was updated on October 7, 2026 and Readrrr on October 16, 2026.

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