CertTool vs DevMate
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CertTool
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If you want to know a little bit about a X.509 certificate CertTool has you covered. Just select a file in PEM or DER format that contains the certificate and it will show you some details. And if you just want to share the certificate to the app, you can do that as well.
DevMate
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DevMate brings common developer utilities into one compact app. Work with QR codes, timestamps, colors, JSON formatting, device information, deep links, and other small tools that are useful during testing, debugging, and daily development. The app is designed to be fast to open and easy to scan, so you can get a quick answer without switching through multiple sites or scripts.
Screenshots
Verdict
The clearest difference is ads: CertTool at none against DevMate's shown. DevMate's advantage is update cadence (weekly vs every 2 months). On price, in-app purchases, 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. Neither carries in-app purchases, so what you see is what you pay.
CertTool ships an update every 2 months, DevMate weekly. The most recent releases landed on September 23, 2026 and August 16, 2026 respectively.
| Parameter | CertTool | DevMate |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 months | Weekly — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.6 | 16.0 — better |
| Further details — not scored | ||
| Size | 6 MB | 27 MB |
| Age rating | 4+ | 4+ |
| Developer | Tim Wilbrink | Beijing Chenghan Bowen Education Technology Co., Ltd. |
In-app purchases
CertTool
No in-app purchases
DevMate
No in-app purchases
