Comparison

C vs Gemini Notebook

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

Head to head
About

C

Connect your iOS device to a CASIO projector to wirelessly display documents, images, live camera feeds, and web pages. It also allows for remote control of a connected computer for enhanced presentations.

Highlights
  • Wireless projection of documents and images
  • Live camera feed projection
  • Web page projection
  • Remote computer control
  • Supports Word, Excel, PowerPoint, PDF, JPEG, PNG, BMP
Features
Read full description

CASIO C-Assist is an iOS app that makes it possible to establish a network connection between an iPad, iPhone, or iPod Touch device and CASIO Projector,*1 and then project documents and images stored in the device's memory, real-time images picked up by the device's built-in camera, and browser screen images. It also enables remote control of a computer connected on the same network for smarter and more efficient presentations. ・File Viewer  For projection of documents and images*2 registered with CASIO C-Assist ・Wireless Camera  For real-time projection of images picked up by the smart device's camera ・Browser  For projection of Web page images using CASIO C-Assist's Web browser ・Remote computer control  For remote control of a computer by a smart device over a network connection Supported Operating Systems iOS 6.0 - 11.4 *1 Supported Projectors XJ-A147, XJ-A247, XJ-A257, XJ-A300WN XJ-M146, XJ-M156, XJ-M246, XJ-M256, XJ-M300XN, XJ-M300WN XJ-UT310WN, XJ-UT311WN, XJ-UT351WN, XJ-UT255 XJ-F20XN, XJ-F200WN, XJ-F210WN (Some models covered by this app may not be available in certain geographic areas.) *2 Projectable Document and Image Files Microsoft Word (doc, docx) Microsoft Excel (xls, xlsx) Microsoft PowerPoint (ppt, pptx) PDF JPEG, PNG, BMP Using CASIO C-Assist Follow the steps below to establish a connection between a smart device and projector and use CASIO C-Assist. 1. Configure projector network settings and then select "Network" as the projectors input source. This will cause the standby screen, showing network information, to be projected. 2. On the smart device, select [Settings] and then [Wi-Fi]. Next, select the same network where the projector is selected. 3. Start up CASIO C-Assist 4. After starting up, CASIO C-Assist will find all connectable projectors on the network and displays them on the smart device screen. Select the projector to which you want to connect. 5. On the home screen, select the function you want to use. Support Site https://world.casio.com

About

Gemini Notebook

This AI-powered tool transforms complex information from various sources into clear, understandable insights. It allows users to upload documents, websites, and videos, then ask questions and receive summarized answers with inline citations. Users can also generate podcast-style audio discussions for a different learning experience.

Highlights
  • Upload PDFs, websites, and videos
  • AI-powered summarization
  • Ask questions about sources
  • Inline source citations
  • Podcast-style audio overviews
  • Offline access
Read full description

Turn complexity into clarity with Gemini Notebook, your brain’s new best friend. Join the millions of students, creators, researchers, professionals, CEOs, and more who are saving time, getting stuff done, and learning in new ways. “One of the most compelling and completely flabbergasting demonstrations of AI’s potential yet.” – The Wall Street Journal Now, with the Gemini Notebook app, you can create and access notebooks, ask questions whenever you think of them, and listen to your podcast-style Audio Overviews on the go with background playback and offline support. UPLOAD SOURCES Upload all your long and complex PDFs, websites, YouTube videos, or text into a notebook. INSIGHTS YOU CAN TRUST Gemini Notebook becomes an expert on your sources, summarizing them and making interesting connections. Then, you can ask it questions about, well, anything — and you can trust the answers, since your sources are cited in-line. LEARN YOUR OWN WAY Long blocks of text not your preferred way to learn? Transform what you uploaded into something more your speed, like a podcast-style audio discussion with two engaging AI hosts. You can even join the show to ask questions or steer the conversation in a different direction.

Screenshots

C4 screens
Gemini Notebook4 screens

Verdict

The call

The clearest difference is review sentiment: Gemini Notebook at 78% against C's 27%. Gemini Notebook also leads on rating (4.9 vs 3.0) and update cadence (weekly vs every 8 months). C's advantage is in-app purchases (none vs 26) and iOS requirement (8.0 vs 17.0). On price, ads 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. Gemini Notebook sells 15 in-app purchases, starting at $1.99 per month. C asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Gemini Notebook holds the better App Store score, 4.9 against 3.0. That said, the two scores are not equally well evidenced: Gemini Notebook has 64K ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 27% of C's written reviews are positive against 78% of Gemini Notebook's.

UpkeepUpdate frequency

C ships an update every 8 months, Gemini Notebook weekly. The most recent releases landed on October 25, 2026 and November 1, 2026 respectively.

Scorecard8 real differences · 3 level
C versus Gemini Notebook: the parameters behind the verdict, then further details
ParameterCGemini Notebook
PriceFreeFree
Rating3.0 (2 ratings)4.9 (64K ratings) — better
Positive reviews27.3% of reviews77.8% of reviews — better
Number of ratings264K — better
Update frequencyEvery 8 monthsWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
Best chart rank—#43 — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS8.0 — better17.0
Further details — not scored
Size26 MB208 MB
Age rating4+12+
DeveloperCASIO COMPUTER CO., LTD.Google LLC

Customer experience

C

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews22 reviews
Positive27.3%
Neutral13.6%
Negative59.1%

Gemini Notebook

All ratings63,632 ratings
Positive96.9%
Neutral1.2%
Negative1.9%
Written reviews2,547 reviews
Positive77.8%
Neutral6.4%
Negative15.8%

Bugs and requests

C

Not enough reviews yet to summarise bugs or requests.

Gemini Notebook

Reported bugs

2 issues
  • Audio coming through earpiece instead of speaker
  • Interactive features not working properly

Requested features

3 requests
  • Ability to curate audio summaries
  • Sync saved notes from web version
  • Add mind maps, study guides, and other advanced features

In-app purchases

None

C

No in-app purchases

15 purchases

Gemini Notebook

Subscriptions15
  • 100 GB2 variants$1.991 Month
  • 200 GB$2.991 Month
  • Google AI Plus (400 GB)2 variants$4.991 Month
Show 12 more
  • Google AI Plus (400 GB)1 Month trial$4.991 Month
  • Google AI Plus (2 TB)2 variants$9.991 Month
  • Google AI Pro (5 TB)2 variants$19.991 Month
  • Google AI Pro (5 TB)1 Month trial2 variants$19.991 Month
  • 100 GB2 variants$19.991 Year
  • 5 TB2 variants$24.991 Month
  • 200 GB2 variants$29.991 Year
  • Google AI Plus (400 GB)$49.991 Year
  • 10 TB2 variants$49.991 Month
  • Google AI Pro (5 TB)$199.991 Year
  • Google AI Pro (2 TB)$199.991 Year
  • Google AI Ultra (30 TB)2 variants$249.991 Month

Questions

Is C free?
C is free to download, with no in-app purchases.
Is Gemini Notebook free?
Gemini Notebook is free to download, with in-app purchases available.
Which has better reviews, C or Gemini Notebook?
Gemini Notebook is rated higher. C averages 3.0 out of 5 from 2 ratings, while Gemini Notebook averages 4.9 from 64K ratings.
Do C or Gemini Notebook have ads?
Neither C nor Gemini Notebook shows ads.
Which is updated more often, C or Gemini Notebook?
C ships an update every 8 months, and Gemini Notebook weekly. Most recently, C was updated on October 25, 2026 and Gemini Notebook on November 1, 2026.

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