Captioo vs Docker Guard
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Captioo
Quickly capture ideas, tasks, and follow-ups on the go. Send notes, images, and links directly to your email with a single tap. Configure predefined recipients and subjects for instant delivery.
- One-tap email sending
- Send notes and images
- Supports widgets
- Share links and text
- Customizable email settings
- Unlimited email sending
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Captioo is designed to be the fastest way to record your ideas, thoughts, tasks, and follow-ups when you're on the go. It is the easiest and fastest way to email something yourself so you will never forget things again. FREE APP ・Available for free forever CORE FEATURES AND BENEFITS ・Send notes to your email in one tap ・Send images from your Camera or Library in one tap ・Supports Widgets SHARE EXTENSION / ACTION EXTENSION ・Share a link from Safari in one tap ・Share a link from Chrome in one tap ・Share a text from a Website in one tap ・Share an image with one tap from the Action Extension EASY TO CONFIGURE ・Set predefined email addresses ・Set predefined subject prefix if desired ・Set predefined email signature if desired IMPORTANT ・Send an unlimited number of emails ・Notes are delivered to your email inbox instantly ・No data collected or shared with third parties, at all
Docker Guard
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Docker Guard is the fastest way to keep an eye on your Docker hosts from your iPhone or iPad. Docker Guard is a native iPhone and iPad monitoring client for your self-hosted Docker environment. It requires the free, open-source Docker Guard Agent running on your Docker host. Connect to any server running the open-source Docker Guard Agent and get a live, industrial-style dashboard of everything that matters — CPU load, memory usage, and the state of every container, image, volume and network. When something needs a nudge, start, stop or restart containers with a single tap. LIVE DASHBOARD - Circular gauges for aggregated CPU and memory usage across all running containers - Sparkline history so you can spot trends at a glance - Engine version, architecture and host name at the top - Counts for containers, images, volumes and networks, always up to date CONTAINER CONTROL - Full container list with status, image and ports - One-tap start, stop and restart - Filter running vs. stopped - Detail view with environment and mount information IMAGES, VOLUMES, NETWORKS - Browse every image on the host with size and tags - Inspect volumes and their drivers - See each Docker network and its driver PRIVACY AND SECURITY FIRST - Your data never touches our servers. The app talks directly to your own Docker Guard Agent over HTTPS. - TLS certificates are pinned on first use (TOFU). Any change is flagged with a clear warning — you decide whether to trust the new fingerprint. - API key authentication for every request. - All credentials and certificate fingerprints live in the iOS Keychain. - Optional Face ID / Touch ID app lock keeps the app protected even if your device is unlocked. BUILT FOR iOS 26 - Native SwiftUI with the Liquid Glass look and feel - Swift 6 strict concurrency, main-actor by default - iPhone and iPad layouts, portrait and landscape - Light and dark mode - English and German SELF-HOSTED BY DESIGN The Docker Guard Agent is a small, open-source Rust service you run on your own machine as a Docker container. It mounts only the Docker socket, exposes a minimal HTTPS API, and generates its own self-signed certificate on first boot. No cloud relay, no telemetry, no third parties. Full setup instructions and the agent source are available on the Docker Guard website. Docker Guard is an independent project and is not affiliated with or endorsed by Docker Inc.
Screenshots
Verdict
The clearest difference is in-app purchases: Captioo at none against Docker Guard's 1. Captioo also leads on iOS requirement (12.2 vs 26.4). Docker Guard's advantage is device support. On price 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. Docker Guard sells 1 one-off in-app purchase. Captioo asks for nothing beyond the download.
| Parameter | Captioo | Docker Guard |
|---|---|---|
| Price | Free | Free |
| Rating | 2.3 (4 ratings) — better | — |
| Positive reviews | 25.0% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | — | Daily |
| Ads | — | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | — | iPhone, iPad — better |
| Requires iOS | 12.2 — better | 26.4 |
| Further details — not scored | ||
| Size | 37 MB | 2 MB |
| Age rating | 17+ | 4+ |
| Developer | 808 inc. | Hans Renz |
In-app purchases
Captioo
No in-app purchases
Docker Guard
- Control Pack$3.99









