Comparison

C vs Promiso

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

Head to head
About

C

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Wireless operation for smooth meetings and presentations. CASIO C-Mirroring is an iOS app that makes it possible to establish a network connection between an iPad, iPhone device and network-compatible 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. *1 Applicable Projector Models: XJ-S400UN/S400WN XJ-UT352WN XJ-F211WN/XJ-F21XN (Some models covered by this app may not be available in certain geographic areas.) ・File Viewer: Projects documents and images *2 registered with CASIO C-Mirroring. ・Wireless Camera: Projects real-time images picked up by the device's built-in camera. ・Browser: Uses the application's built-in web browser to project web pages with the projector. *2 Projectable Document and Image Files Microsoft Word (doc, docx) Microsoft Excel (xls, xlsx) Microsoft PowerPoint (ppt, pptx) PDF JPEG, PNG Using CASIO C-Mirroring Use the steps below to establish a connection between a smart device and projector with this app. If you are already connected via a wireless LAN access point, refer to your projector's Network Function Guide. (1) Configure projector network settings. (2) Select "Network" as the projectors input source. This projects the standby screen, which shows network information. (3) On the smart device, select the desired access point with "Settings" - "Wi-Fi" and establish a connection. (4) Start up CASIO C-Mirroring. (5) On the home screen, select the function you want and execute it. (6) When you want to project with the projector, tap the Play button. When a connectable projector is found, select it. If a connectable projector isn't found, input IP address of the projector then connect to it.

About

Promiso

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Promiso helps you keep your promises and build trust with the people who matter most. Make a promise, track your commitment, and watch your reliability grow. Whether it's a promise to yourself or someone you love, Promiso keeps you accountable with gentle reminders and progress tracking. KEY FEATURES - Create & Track Promises Set promises with deadlines, categories, and priorities. Never forget a commitment again. - Build Your Trust Score Complete promises to increase your trust score and show others (and yourself) that you're someone who keeps their word. - Gamified Progress Earn XP, level up, and unlock achievements as you fulfill your promises. Stay motivated with streaks and milestones. - Smart Reminders Get timely notifications so you never miss a deadline. - Beautiful Statistics View your promise history, completion rates, and relationship insights with detailed stats. - Privacy First All your data stays on your device. Your promises are yours alone. PREMIUM FEATURES - Unlimited promises - Ad-free experience - Advanced statistics - Priority support Start keeping your promises today. Download Promiso and become someone people can count on. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://github.com/gokhanhepsen/promiso/blob/main/PRIVACY_POLICY_EN.md

Screenshots

C3 screens
Promiso4 screens

Verdict

The call

The clearest difference is in-app purchases: C at none against Promiso's 3. C also leads on ads (none vs shown). Promiso's advantage is update cadence (every 11 days vs every 4 months). On price, device support and iOS requirement there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. Promiso sells 3 in-app purchases, starting at $3.99 per month. C asks for nothing beyond the download.

UpkeepUpdate frequency

C ships an update every 4 months, Promiso every 11 days. The most recent releases landed on November 4, 2026 and November 9, 2026 respectively.

Scorecard3 real differences Β· 3 level
C versus Promiso: the parameters behind the verdict, then further details
ParameterCPromiso
PriceFreeFree
Update frequencyEvery 4 monthsEvery 11 days β€” better
AdsNo β€” betterYes
In-app purchasesNo β€” betterYes
DevicesiPhone, iPad, iPod β€” betteriPhone, iPod
Requires iOS15.0 β€” better15.1
Further details β€” not scored
Size33 MB46 MB
Age rating17+4+
DeveloperCASIO COMPUTER CO., LTD.GOKHAN HEPSEN

In-app purchases

None

C

No in-app purchases

3 purchases

Promiso

Subscriptions2
  • Premium Monthly$3.991 Month
  • Premium Yearly$24.991 Year
One-time1
  • Lifetime Premium$29.99

Questions

Is C free?
C is free to download, with no in-app purchases.
Is Promiso free?
Promiso is free to download, with in-app purchases available.
Do C or Promiso have ads?
Promiso shows ads; C does not.
Which is updated more often, C or Promiso?
C ships an update every 4 months, and Promiso every 11 days. Most recently, C was updated on November 4, 2026 and Promiso on November 9, 2026.

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