Cert Decoder VS Alt Audit

Which is more popular?

Based on our record, Cert Decoder seems to be more popular. It has been mentioned 1 time since March 2021.

social mentions: 1 vs 0
Monitoring Tools popularity: 100% vs 0%

Base details

Website, pricing, platforms and company facts side by side.

	Cert Decoder	Alt Audit
Website	certdecoder.com	altaudit.com
Pricing	Free	Open source Freemium Official pricing
Platforms	Web	Wordpress WooCommerce
Company	—	Startup from the United States · 1 - 9 employees · 2025
Listed in	SSL Certificates Decoding Website Monitoring Monitoring Tools +1	SEO SEO Tools Web Accessibility Photos & Graphics Image Optimisation Metadata Management WordPress Plugins AI +5

About Cert Decoder and Alt Audit

In their own words, as submitted to SaaSHub.

Cert Decoder

Alt Audit

Cert Decoder is a free online tool that helps you decode X.509 SSL/TLS certificates in PEM format. It instantly shows important information like the issuer, expiry date, SAN entries, and fingerprint. All data is processed locally in your browser, so nothing is ever sent or stored elsewhere.

Features and specs

What each product offers, as listed by its team.

Cert Decoder 4 features

Alt Audit 5 features

User-Friendly Interface
Cert Decoder is designed with a simple and intuitive interface that makes it easy for users to navigate and use the tool without requiring extensive technical knowledge.
Comprehensive Analysis
The tool provides detailed analyses of certificates, including information about validity, issuer, encryption algorithms, and more, helping users understand their security certificates thoroughly.
Free to Use
Cert Decoder offers its services free of charge, making it accessible for individuals and organizations without budget constraints.
Quick Processing
The tool processes certificate information rapidly, providing almost instant results for users, which is crucial for time-sensitive tasks.

Possible disadvantages

Limited Advanced Features
Compared to some paid alternatives, Cert Decoder might lack advanced features that are necessary for more complex certificate management and diagnostics.
Reliance on Internet Access
Users need an active internet connection to utilize the tool, which can be a limitation in areas with unreliable internet service.
Privacy Concerns
While using an online service to decode certificates, there can always be privacy concerns regarding sensitive data being uploaded to a third-party server.
No Offline Mode
Cert Decoder does not offer an offline mode, which could be a drawback for users who require functionality without constant internet availability.

Alt Text Audit
Scans WordPress sites to detect missing, empty, or low-quality image alt text.
AI Alt Text Generation
Uses AI to generate meaningful, context-aware alt text optimized for accessibility and SEO.
Bulk Alt Text Generation
Generate alt text for hundreds or thousands of images in one action.
Manual Review & Approval
Review and edit AI-generated alt text before applying changes.
WordPress Media Library Integration
Works directly inside the WordPress Media Library with no external tools.

Analysis

An editorial look at what each product does well and who it suits.

Cert Decoder

Alt Audit

Overall verdict

Cert Decoder appears to be a free online tool for decoding and inspecting SSL/TLS certificates, CSRs, and related cryptographic data, making it useful for quick, no-install certificate analysis, though it should be used with awareness of general web tool privacy considerations when handling sensitive certificate data.

Why this product is good

Provides quick, browser-based decoding of certificates without needing to install software
Useful for troubleshooting SSL/TLS certificate issues on the fly
Simple interface aimed at both technical and semi-technical users
No cost to use for basic certificate decoding tasks

Recommended for

System administrators needing to quickly verify certificate details
Developers debugging SSL/TLS configuration issues
IT support staff troubleshooting website certificate errors
Students or professionals learning about certificate structure and encoding

Overall verdict

I don't have verified information about Alt Audit (altaudit.com) in my knowledge base, so I can't provide a reliable assessment of its quality, features, or reputation. I'd recommend checking recent reviews, user testimonials, and independent sources before making a decision.

Why this product is good

Unable to confirm specific features or benefits without verified data
No access to current user reviews or ratings for this specific product
Recommend visiting the official website and checking third-party review platforms like Trustpilot or G2
Consider looking for case studies or independent audits of the tool's claims

Recommended for

Anyone considering this tool should first verify its legitimacy and current standing through independent research
Users should check for recent user feedback, company transparency, and any red flags before committing
Best to consult recent reviews from verified users rather than relying on unverified information

Videos

Walkthroughs and reviews on video.

Cert Decoder 0 videos + Add

Alt Audit 1 video + Add

No Cert Decoder videos yet. You could help us improve this page by suggesting one.

Alt Audit Access & Image SEO Improvements

Category popularity

How often each product is chosen within a category, 0–100% relative to the other.

Score bands 0–20 21–40 41–50 51–60 61–100

Cert Decoder

Alt Audit

100% 100%

0% 0%

100% 100%

0% 0%

100% 100%

Questions & Answers

As answered by people managing Cert Decoder and Alt Audit.

What's the story behind your product?

Cert Decoder's answer

I built certdecoder.com over the weekend for my own needs. Sometimes in my work, I need to verify and check certificate details.

Alt Audit's answer:

Alt Audit was created to solve a common WordPress problem: missing or poor alt text across large websites.

Manually fixing alt text is time-consuming, error-prone, and often ignored until accessibility or SEO issues arise. Existing tools either lacked auditing or applied AI blindly without accessibility context.

Alt Audit was built to bridge that gap by combining: - Automated site-wide auditing - AI-assisted, context-aware alt text generation - Human review and bulk management inside WordPress

The goal is to make accessibility and image SEO practical and achievable, even for non-technical users.

Which are the primary technologies used for building your product?

Cert Decoder's answer

certdecoder.com was built using just JavaScript and HTML—simple, fast, and with all processing happening locally in your browser, so no certificate data is sent to any server

Alt Audit's answer:

Alt Audit is built using modern WordPress and AI technologies.

Primary technologies include: - WordPress plugin architecture (PHP, hooks, REST API) - JavaScript for dashboard UI and bulk actions - AI models for image and context-based alt text generation - Secure API communication for AI processing - WordPress Media Library and database integration

The plugin is designed to be lightweight, secure, and compatible with standard WordPress hosting environments.

How would you describe the primary audience of your product?

Cert Decoder's answer

certdecoder.com is primarily built for developers, sysadmins, cybersecurity enthusiasts, and DevOps engineers.

Alt Audit's answer:

Alt Audit is built for WordPress users who care about accessibility, SEO, and scalability.

Primary audiences include: - Website owners and bloggers managing large media libraries - SEO professionals optimizing image search visibility - Agencies maintaining accessibility standards across client sites - WooCommerce store owners with hundreds or thousands of product images - Developers and teams preparing sites for accessibility compliance

It is especially valuable for users who want to improve accessibility without manually editing alt text image by image.

Why should a person choose your product over its competitors?

Cert Decoder's answer

Simple, fast, and reliable. Some similar tools can’t even decode basic certificates. I rigorously tested my tool with many real-world certificates and covered several edge cases where competitors fall short.

Alt Audit's answer:

Alt Audit is ideal for users who want control, accuracy, and scalability instead of one-click automation with no oversight.

Compared to competitors, Alt Audit: - Audits existing alt text quality instead of blindly overwriting it - Allows users to review, edit, and approve AI-generated alt text - Works directly inside WordPress with no external dashboards - Supports bulk workflows for large sites and WooCommerce stores - Balances automation with accessibility best practices

Many alternative tools focus only on generation. Alt Audit focuses on fixing real accessibility and SEO problems responsibly.

Who are some of the biggest customers of your product?

Cert Decoder's answer

certdecoder.com is primarily built for developers, sysadmins, cybersecurity enthusiasts, and DevOps engineers.

Alt Audit's answer:

WordPress agencies managing multiple client sites
WooCommerce store owners with large product catalogs
Content publishers and bloggers with image-heavy websites
SEO consultants and accessibility specialists
Small to mid-sized businesses improving compliance and SEO

What makes your product unique?

Alt Audit's answer:

Alt Audit combines alt text auditing, AI-powered generation, and bulk management in a single WordPress plugin.

Unlike basic alt text generators, Alt Audit first audits your entire site to identify missing, empty, or low-quality alt text. It then uses AI to generate context-aware alt text that aligns with accessibility best practices and SEO guidelines.

Key differentiators: - Built specifically for WordPress (not a generic SaaS) - Bulk scanning and bulk generation across media libraries and pages - Focus on WCAG accessibility compliance, not just SEO - Clear audit reports and full control before applying changes - Free monthly AI credits to test real workflows

Alt Audit is designed to solve alt text issues at scale, not just image by image.

User comments

Share your experience with using Cert Decoder and Alt Audit. For example, how are they different and which one is better?

Social recommendations and mentions

Recommendations tracked on public social media and blogs since March 2021.

Cert Decoder 1 mention

Alt Audit 0 mentions

Banana.dog back from the dead
Why? Because I built certdecoder.com and couldn’t find a decent place to submit it. So I said screw it — I’ll build my own. With blackjack and hookers. - Source: dev.to / over 1 year ago

Tracking Alt Audit since Feb 2026.

Compare Cert Decoder VS Alt Audit and see what are their differences

Base details

About Cert Decoder and Alt Audit

Features and specs

Analysis

Videos

Category popularity

Questions & Answers

What's the story behind your product?

Which are the primary technologies used for building your product?

How would you describe the primary audience of your product?

Why should a person choose your product over its competitors?

Who are some of the biggest customers of your product?

What makes your product unique?

User comments

Social recommendations and mentions