Web PKI vs Book Fair
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Web PKI
Perform digital signatures using certificates from your mobile device on compatible websites and applications. Securely authenticate documents and transactions on the go.
- Digital signatures with mobile certificates
- Compatibility with websites
- Compatibility with applications
- Secure authentication
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O Web PKI permite realizar assinaturas digitais com certificados do seu celular em sites ou aplicativos compatíveis.
Book Fair
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Acompanhe as vendas do seu colégio em tempo real
Screenshots
Verdict
The clearest difference is iOS requirement: Book Fair at 10.0 against Web PKI's 15.0. On price, update cadence, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 6, 2026 and November 7, 2026 respectively.
| Parameter | Web PKI | Book Fair |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (4 ratings) — better | — |
| Positive reviews | 25.0% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 2 months | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 10.0 — better |
| Further details — not scored | ||
| Size | 31 MB | 24 MB |
| Age rating | +4 | 4+ |
| Developer | Lacuna Software | Tecnospeed Tecnologia de Informacao Ltda |
In-app purchases
Web PKI
No in-app purchases
Book Fair
No in-app purchases
