CalKeyboard vs DD Life Vault
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CalKeyboard
This keyboard app integrates a calculator directly into your typing experience. Perform calculations without leaving your current application. It's designed for quick math needs while messaging or working.
- Integrated calculator
- Type and calculate simultaneously
- Seamless integration
- Quick calculations
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No more explanation It's a keyboard with calculator should be created already keyboard!
DD Life Vault
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DD Life Vault is your all-in-one secure digital vault for organizing and protecting every aspect of your life. Powered by AES-GCM encryption and protected by a master password plus biometric authentication (Face ID / Touch ID).
Screenshots
Verdict
The clearest difference is in-app purchases: DD Life Vault at none against CalKeyboard's 1. DD Life Vault also leads on update cadence (fortnightly vs every 8 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. CalKeyboard sells 1 one-off in-app purchase. DD Life Vault asks for nothing beyond the download.
CalKeyboard ships an update every 8 months, DD Life Vault fortnightly. The most recent releases landed on October 11, 2026 and October 25, 2026 respectively.
| Parameter | CalKeyboard | DD Life Vault |
|---|---|---|
| Price | Free | Free |
| Rating | 3.4 (5 ratings) — better | — |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 5 — better | — |
| Update frequency | Every 8 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 2 MB | 51 MB |
| Age rating | 4+ | 4+ |
| Developer | FebesGoods Studio | Thaw De Zin |
In-app purchases
CalKeyboard
- Full Version$0.99
DD Life Vault
No in-app purchases
