# BlockCertsAI vs Plain

The clearest difference is review sentiment: BlockCertsAI at 100% against Plain's 50%. BlockCertsAI also leads on update cadence (every 3 weeks vs every 4 months). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. BlockCertsAI sells 10 one-off in-app purchases and Plain sells 3 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

BlockCertsAI ships an update every 3 weeks, Plain every 4 months. Both last shipped on October 6, 2026.

## The numbers

| Metric | BlockCertsAI | Plain |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/blockcertsai/id6446503518/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 4 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 185 MB | 26 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [BlockCerts](https://appshunter.io/developer/1478391176) | [MOBIVERSITE YAZILIM BILISIM REKLAM VE DANISMANLIK HIZMETLERI SANAYI TICARET LIMITED STI](https://appshunter.io/developer/968440561) |

## What reviewers say

### BlockCertsAI

[App page](https://appshunter.io/ios/app/blockcertsai/id6446503518)

This app offers a secure virtual space powered by AI and blockchain for managing operations, credentials, and documents. It provides tools for individuals, small businesses, and enterprises to streamline workflows, enhance security, and improve collaboration.

**Highlights:** Secure virtual space technology, AI and blockchain integration, Credential verification and management, Secure file sharing and document storage, Smart contract integration, Streamlined business operations, Employee onboarding tools

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Buy 10 Black BCERTs Credits | $1.90 | one-time |
| Buy 20 Black BCERTs Credits | $3.79 | one-time |
| Buy 30 Black BCERTs Credits | $5.69 | one-time |
| Buy 50 Black BCERTs Credits | $9.49 | one-time |
| Buy 75 Black BCERTs Credits | $14.49 | one-time |
| Buy 100 Black BCERTs Credits | $19.00 | one-time |
| Full App Access | $20.00 | one-time |
| Buy 125 Black BCERTs Credits | $23.90 | one-time |
| Buy 150 Black BCERTs Credits | $28.49 | one-time |
| Buy 200 Black BCERTs Credits | $38.00 | one-time |


### Plain

[App page](https://appshunter.io/ios/app/plain-ai-keyboard/id6467874401)

This advanced AI-powered keyboard acts as your personal text assistant, offering features like grammar correction, translation, and tone adjustment. It helps you write, communicate, and generate text more effectively across all your applications.

**Highlights:** Grammar and spell check, Seamless translation, AI-powered answers, Tone adjustment, Text paraphrasing, Response generation, Text continuation, Synonym finder

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Week PRO | $4.99 | per 7 days |
| 1 Month PRO | $9.99 | per month |
| 1 Year PRO | $39.99 | per year |


## Frequently asked questions

### Is BlockCertsAI free?

BlockCertsAI is free to download, with in-app purchases available.

### Is Plain free?

Plain is free to download, with in-app purchases available.

### Do BlockCertsAI or Plain have ads?

Neither BlockCertsAI nor Plain shows ads.

### Which is updated more often, BlockCertsAI or Plain?

BlockCertsAI ships an update every 3 weeks, and Plain every 4 months. Most recently, BlockCertsAI was updated on October 6, 2026 and Plain on October 6, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*