Sign Learn vs C4official
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Sign Learn
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Sign Learn is Indian Sign Language (ISL) dictionary by Indian Sign Language Research and Training Centre (ISLRTC).
C4official
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Live online challenges, courses and consulting for coaches to launch successful marketing campaigns in Facebook, Instagram, WhatsApp, YouTube and LinkedIn using C4-FRAMEWORK without depending on advertising agencies. Join the community to learn more about: 1) 30Days DIY Challenge 2) 60Days Advanced DIY Challenge
Screenshots
Verdict
The clearest difference is in-app purchases: Sign Learn at none against C4official's 2. Sign Learn also leads on update cadence (every 2 weeks vs every 6 months). On price, ads, device support and iOS requirement 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
Both are free to download. C4official sells 2 one-off in-app purchases. Sign Learn asks for nothing beyond the download.
Sign Learn ships an update every 2 weeks, C4official every 6 months. The most recent releases landed on October 13, 2026 and September 15, 2026 respectively.
| Parameter | Sign Learn | C4official |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 weeks — better | Every 6 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.1 | 15.1 |
| Further details — not scored | ||
| Size | 19 MB | 52 MB |
| Age rating | 4+ | 4+ |
| Developer | Islrtc NewDelhi | TagMango Inc |
In-app purchases
Sign Learn
No in-app purchases
C4official
- C4 L2: Expansion Membership$29.99
- C4L1: DIY Meta Ads$49.99
