ReplyBox alternative for blogs that want guest comments

If you are looking for a ReplyBox alternative, it is probably not because ReplyBox is bad. It is small, quick, ad-free and honest about privacy, and its WordPress plugin keeps ReplyBox comments and native WordPress comments in sync, which nothing else in the category does as neatly. The reasons people look elsewhere are narrower. ReplyBox asks readers to sign in with Google before they comment, and it prices by page views, so a blog that grows pays more without gaining anything a reader can see.

This post compares ReplyBox with EchoThread on the things that decide the choice: what each costs at realistic traffic, how readers get to comment, how spam is handled, and what you give up either way. We build EchoThread, so treat our claims as claims and check both products' own pages, which are linked throughout.

ReplyBox pricing, as published

ReplyBox's pricing page uses a slider: "Select the average number of pageviews you expect ReplyBox to count." The three positions and their prices, read on 3 September 2026:

Every plan includes unlimited sites, automatic spam filtering, moderation tools, WordPress comment syncing and custom CSS. The trial is "14 days, free of charge and with no credit card required", and if you are not happy in the first month of paying "we will refund 100% of your money". The overage rule is generous: "We never charge for occasional traffic spikes, nor do we shut your comments off if you reach your plan limit. Instead, if you go over your plan limit two months in a row, we will contact you to upgrade your account." There is no free plan.

The prices above are what the page's calculator showed on the day; the pricing page is the authority for yours.

The sign-in question

This is the whole decision for a lot of blogs, so it goes first. ReplyBox's homepage describes reader sign-in as "Social Login: Make commenting easier by authenticating via Google in just two clicks (Twitter and the rest coming soon)", and its WordPress.org listing says the same. Nothing on either page describes commenting without an account.

Whether that matters depends on who reads you. A developer blog's readers will sign in with anything. A recipe blog, a local news site or a hobby forum loses most of its comments at the sign-in box, because the reader was going to type two sentences and is not going to hand over a Google account to do it. If you have ever run a blog with and without guest comments you already know which side of this you are on.

EchoThread lets readers comment as guests, with a name and nothing else, and the spam filter scores every guest comment before it is shown. Guest commenting is a per-site switch: turn it off and readers sign in with a passkey, Google, GitHub, X or Facebook instead. You can run it either way, or start open and tighten later if the queue fills up.

A worked example bill

Take a blog with two sites and 100,000 page views a month across them, wanting the widget to match the site's colours.

Now the small case, because it goes the other way. A single site with 20,000 page views a month is $6 on ReplyBox, or $5 billed annually. On EchoThread that site is free on Hobby if it was created before 1 October 2026, because those sites keep unmetered page views. A site created after that date has a 10,000 page-view allowance on Hobby, so at 20,000 it belongs on Starter at $9, which is more than ReplyBox charges for the same traffic. If you run one small site, read the sign-in section again and decide on that; on price alone ReplyBox is cheaper at the bottom of the range and EchoThread is cheaper from about 100,000 page views or a second site onwards.

One difference in how the two meters behave: ReplyBox counts page views towards a plan you chose; EchoThread's page-view allowance is soft, so crossing it gets you an email rather than a disabled widget, and comments are unlimited on every plan.

Spam handling

ReplyBox filters with Akismet "and a few other bright ideas", backed by "a manual approval system that's simple and effective". Akismet is a good filter for the kind of spam that links to a casino. EchoThread uses a first-party machine-learning classifier, Siftfy, that scores every comment as it is posted, guest or signed in, and was trained for fluent, on-topic, AI-written spam rather than the keyword-stuffed kind. A high score alone sends a comment to your queue; auto-hiding also needs a corroborating signal such as a link or a promo pattern, a rule that exists because the model was once too confident about non-English comments. The Korean-language incident and the fix are written up honestly, and preventing comment spam without a CAPTCHA covers the reasoning.

Because ReplyBox readers are signed in with Google, it also has less anonymous spam to deal with in the first place. That is a real advantage of the sign-in wall, and the fair way to put it is that ReplyBox prevents guest spam by preventing guests.

Where ReplyBox wins

• WordPress sync. Comments posted through ReplyBox land in WordPress's own comments table and stay in sync, so a theme, a plugin or an export that expects native comments keeps working. If you are on WordPress and might leave ReplyBox one day, this is the best exit ramp in the category.
• Unlimited sites on every plan. A designer with a dozen small client blogs pays for the traffic once.
• The smallest tier is cheaper. $5 to $6 a month for 20,000 page views undercuts EchoThread's $9 Starter for a new site above Hobby's allowance.
• Markdown, upvotes and pinned comments are all there, and the page claims a footprint "15x lighter than Disqus".
• A 100% refund in the first paid month, which is rare.

Where EchoThread wins

• Guest comments with a spam score. Readers comment without an account and the filter still runs on every one.
• More ways to sign in when you do want accounts: passkeys, Google, GitHub, X and Facebook, switchable per site from the dashboard.
• A permanent free plan. Hobby is free, not a 14-day trial: one site, unlimited comments, no ads, no card.
• Flat pricing above the bottom tier. Three sites and 100,000 page views are $9 a month; ten sites and a million page views are $19.
• Reactions, image uploads, link previews and threaded replies in the widget, and a reader interface that follows each visitor's language (English, Italian, Korean and Simplified Chinese today).
• Import from Disqus in one step, and export everything as JSON or CSV at any time.
• Five team seats on every plan, including Hobby.

EchoThread's Hobby plan is free for your first site: unlimited comments, no ads, no reader tracking, and 10,000 page views a month on sites created from 1 October 2026 (a site created before that date keeps unmetered page views). Paid plans start at $9 a month for three sites and 100,000 page views; see pricing for the full ladder.

Switching from ReplyBox

ReplyBox's site does not describe a general export, but on WordPress you do not need one: the sync means your comments are already in WordPress, and the WordPress comments migration guide covers getting them out of there. For any other platform, ask ReplyBox for your data and bring it across with EchoThread's JSON import: a list of threads, each with a page URL and its comments (author, body, timestamp, optional parent for replies). Keep the page URL as the identifier and the imported threads line up with the pages they belong to.

Then swap the embed. On WordPress, deactivate the ReplyBox plugin and install the "Comments – EchoThread" plugin from the plugin directory, paste your API key, and the widget replaces the native comment form; the ad-free WordPress comment plugin post walks through it. Everywhere else, the snippet is two tags:

<div id="echothread"
     data-api-key="YOUR_API_KEY"
     data-page-url="https://example.com/your-post/"
     data-identifier="your-post"
     data-page-title="Your post title"></div>
<script src="https://cdn.echothread.io/widget.js" async></script>

Put the div where the comments should appear and the script anywhere on the page; data-page-url should be the canonical URL of the page and data-identifier a stable id such as the slug. Platform-specific versions exist for Hugo, Eleventy, Jekyll, Astro and Ghost, and Publii users get an official plugin.

Prices were read from getreplybox.com on 3 September 2026 and will change; the calculator on their pricing page is the authority for your own numbers.