Comparison

Memory Math vs CastReader

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

Head to head
About

Memory Math

Features
Read full description

Improve memory while practicing basic math.  Math drills using the flash cards method which includes: - addition,  - subtraction,  - multiplication,  - division, and  - a combination of it all is the theme of this memory game.  The number of moves is designed to be turned on or off, no pressure. Challenge yourself to solve the game in the least amount of moves once you've mastered the math drills. If not, it's ok too. Have fun with math and keep learning! No ads. No in-app purchase.

About

CastReader

This app transforms your reading into an audio experience with natural voices and synced highlighting. It offers AI-powered explanations for complex passages, making difficult texts easier to understand. Listen to books, documents, and web pages while on the go.

Highlights
  • Listen to Kindle books, PDFs, EPUBs
  • AI explanations for complex text
  • Synced highlighting with read-aloud
  • Auto-scroll and resume progress
  • Background and lock-screen playback
  • Supports web pages, photos, and pasted text
Features
Read full description

Read your own books aloud. CastReader turns PDF and EPUB books, web articles, and documents into speech, with text highlighting that helps you follow every word. Listen while you commute, study, or give your eyes a break. READ ALOUD AND FOLLOW ALONG Hear the original text in natural voices while the spoken words are highlighted and the page scrolls automatically. Read a chapter, review study notes, or listen to text recognized from a photo. Keep your place with both sound and text. UNDERSTAND WITH AI EXPLAIN For a difficult passage, listen to an AI-generated explanation. CastReader reads the explanation while marking the original with highlights, circled terms, and numbered steps, so you can connect each idea to the source. BRING YOUR OWN CONTENT - Camera or photo: recognize printed text - Web: open a URL and start listening - Files: PDF, EPUB, TXT, DOCX, and images - Paste: turn copied text into speech instantly - Kindle: connect your Kindle library and continue reading - Listen to YouTube: share or paste a public video link and hear its public captions with synchronized highlighting For Listen to YouTube, only public videos with accessible captions are supported. Videos requiring sign-in, age verification, membership, regional access, or private access cannot be read. CastReader does not play, download, or retain YouTube video or audio streams; speech is generated from caption text. CastReader is not affiliated with or endorsed by YouTube. ON IPHONE AND IPAD Use the layouts built for iPhone and iPad, in portrait or landscape. The Safari extension reads web pages with highlighting and automatic scrolling. Enable it in Safari settings and allow access to the pages you want to read. 32 READING LANGUAGES The international app now reads Bengali, Marathi, Punjabi (Gurmukhi) and Tamil, in addition to the existing 28 languages. The interface remains available in 28 languages. China services support 9 reading languages. Voice options and cloning support vary by language and region. FREE AND CASTREADER PRO Use CastReader free every day. Choose a monthly or annual Pro subscription for unlimited reading with standard voices, unlimited AI explanations, premium voice access, and playback speeds up to 3x. Cloned voices require Pro and use a separate allowance: 120 minutes per monthly allowance period. Optional 120-minute top-up packs add cloned-voice time without extending Pro. Local prices, billing periods, and renewal terms are shown in App Store before purchase. Voice and feature availability may vary by region. Dark mode and background playback are supported. Supported languages use Apple’s on-device OCR. Bengali, Marathi, Punjabi and Tamil use Google cloud OCR: images are sent for recognition through the international service after sign-in. Accuracy varies by language and image quality. Local reading history stays on your device; connected services handle their account and reading data under their own policies. Support for iPhone Duo: unfold for a roomier reading view, then fold back while keeping your place. Read Aloud and AI Explain adapt to the available space. EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Memory Math4 screens
CastReader4 screens

Verdict

The call

The clearest difference is price: CastReader at Free against Memory Math's $2.99. CastReader also leads on update cadence (every 2 days vs every 38 months) and device support (3 vs 1). Memory Math's advantage is in-app purchases (none vs 5). On ads 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

CastReader is free to download; Memory Math costs $2.99 up front. CastReader sells 5 in-app purchases, starting at $4.99 per month. Memory Math asks for nothing beyond the download.

UpkeepUpdate frequency

Memory Math ships an update every 38 months, CastReader every 2 days. The most recent releases landed on October 5, 2026 and October 21, 2026 respectively.

Scorecard5 real differences · 5 level
Memory Math versus CastReader: the parameters behind the verdict, then further details
ParameterMemory MathCastReader
Price$2.99Free — better
Rating—4.8 (39 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—39 — better
Update frequencyEvery 38 monthsEvery 2 days — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Free
DevicesiPhoneiPhone, iPad, Mac — better
Requires iOS26.017.6 — better
Further details — not scored
Size6 MB157 MB
Age rating4+4+
DeveloperSigma Sky, LLCohsame Inc

In-app purchases

None

Memory Math

No in-app purchases

5 purchases

CastReader

Subscriptions4
  • CastReader Pro (Monthly)7 Days trial$4.991 Month
  • CastReader Pro (Monthly)7 Days trial$9.991 Month
  • CastReader Pro (Yearly)7 Days trial$34.991 Year
Show 1 more
  • CastReader Pro (Yearly)7 Days trial$59.991 Year
One-time1
  • 120 Clone Voice Minutes$2.99

Questions

Is Memory Math free?
Memory Math costs $2.99, with no in-app purchases.
Is CastReader free?
CastReader is free to download, with in-app purchases available.
Do Memory Math or CastReader have ads?
Neither Memory Math nor CastReader shows ads.
Which is updated more often, Memory Math or CastReader?
Memory Math ships an update every 38 months, and CastReader every 2 days. Most recently, Memory Math was updated on October 5, 2026 and CastReader on October 21, 2026.

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