Best social listening tools: Octolens, Redreach, ReplyGuy and Subgrow compared

You need to know what people are saying about your product, and you're stuck on whether that means a real listening tool, a tool that finds threads to reply in, or something that gets your own posts ranking. This comparison is for founders and marketers at software companies choosing among the best social listening tools. It covers four options that solve different versions of the problem: Octolens, Redreach, ReplyGuy and Subgrow.

One caveat first. Only one of these is a classic listening tool. The others start from the same signal, people talking about tools online, and do something different with it. Pick based on what you want to happen after you find a mention.

Octolens: the closest thing to pure social listening

Octolens tracks mentions of your brand and competitors across socials, communities, media and reviews. Its sources include Reddit, X, LinkedIn, Hacker News, YouTube, GitHub, podcasts, news, newsletters and review sites, plus forums and app stores.

What it does well

• Coverage beyond social networks. Its pitch is that many listening tools stick to social and miss communities, media and reviews. Octolens puts all of those in one feed.
• Noise filtering. An AI relevance filter scores each mention. Its demo shows a podcast about folklore and a leadership post being filtered out while a bug report, a switch-intent thread and a piece of praise get through. If your brand name is also a common word, that matters.
• Routing. Mentions can go to Slack, Linear, Attio, a webhook, or an agent such as Claude via MCP. A mention can become a bug ticket or an inbound lead without anyone copying it over.
• Low-friction trial. A 7-day free trial, no credit card, about two minutes to set up.
• Developer-heavy customer list. The homepage shows logos like Vercel, Cursor, Lovable, Supabase, PostHog and Sentry.

Where it falls short

• It listens; it doesn't publish. It tells you what's being said. Writing replies, posts or content is still your job.
• Pricing isn't on the homepage. Beyond the free trial, you'll need to check the plans yourself.
• More feed than you may need. If you only care about Reddit and want help acting on it, a wide net across podcasts, news and newsletters is more than the job requires.

Redreach: Reddit conversations to join

Redreach is narrower. It finds Reddit conversations worth entering, including posts that already rank high on Google, and offers AI-guided replies so you can mention your product naturally. It also monitors your brand and competitors around the clock.

What it does well

• Setup without keyword lists. You give it your website and your top three competitors, and it works out relevant topics and threads. Many people don't know which keywords to enter, and this removes that step.
• Focus on threads that already get traffic. It points you at Reddit posts that show up in Google, so a reply can reach people who are searching.
• Reddit-specific monitoring. Each surfaced thread comes with a relevance score, so you can sort by fit.
• Social proof on the page. It says it's trusted by 100+ companies, and a testimonial from a Simple Analytics co-founder claims a steady stream of leads from Reddit. That's the customer's own claim, not an independent figure.

Where it falls short

• Reddit only. It isn't a broad listening tool. It won't watch news, reviews, podcasts or X for you.
• Your replies live in threads you don't own. You're a guest in someone else's subreddit, so the thread, its rules and its moderators sit outside your control.
• It still needs a person. You engage; it finds and suggests. That's the right split for some teams and extra work for others.
• Pricing isn't shown in the page text I'd use, so check the signup flow.

ReplyGuy: find mentions across the web and draft replies

ReplyGuy tracks keywords across the internet, picks recent, relevant posts where your product fits, and drafts replies that aim to help the original poster while mentioning your product. Plans include auto-replies and screenshot proof of every reply.

What it does well

• Clear cost structure. Plans are a monthly credit budget. A posted reply costs 3 credits and a comment it finds for you costs 1. The Pro plan starts at $49/mo with 10 keywords, 100 credits a month and 1 project.
• Fast to start. You can run a free audit of your website in about 15 seconds without an account. Setup is adding keywords, and the AI suggests some.
• Hands-off option. It can send replies itself, and it keeps screenshot proof of each posted reply so you can see what went out under your name.
• Scale. It says it's trusted by 8,092 businesses, and higher plans add projects, keywords and credits for agencies.

Where it falls short

• It's a reply engine, not a listening dashboard. The output is replies and leads, not a feed of brand sentiment or competitor coverage.
• Credits run out. Because each posted reply costs 3, heavy use needs a bigger plan or extra credits.
• Automated replies carry risk. Posts going out in your name in threads you don't moderate need review to stay useful and on-topic.
• Keyword-driven. Results depend on the keywords you pick, within the plan limits.

Subgrow: not listening, but owning the posts people find

Subgrow belongs here only because it starts from the same fact: Google already sends buyers to Reddit posts, and none of those posts are the brand's. Instead of watching those threads or replying in them, it publishes posts in a subreddit your brand owns and moderates.

It's a done-for-you service. Subgrow suggests a subreddit name, opens it, runs your brand's moderator account (no password shared), and posts one post a day. It researches your site and your three closest competitors, then starts with the three strongest search questions for your product, shown with monthly search volume and difficulty. As an example from its own material, "claude vs chatgpt" shows 49,500 searches a month at Low difficulty.

What it does well

• You control the review. Every post is ready a week early. You can read it, edit it or skip it. If you do nothing, it goes out on its day.
• Formats that fit search. How-tos, comparisons, top-10 lists and questions for the group.
• Your blog is included. Your 25 newest articles are imported first, and new ones follow.
• Measurement. It sets up Google Analytics so visits show as reddit / organic_social. In one customer report, Writingmate had 28 sessions from Sep 18 to Oct 15, 2026.
• Proof it cites. Gemini picked AppFollow's subreddit as its #1 source with 19 citations within three weeks. AI search quoted two posts from Cube's subreddit 23 times from August to October. Recraft's articles got about 10x more views in its subreddit than on its blog.

Where it falls short

• It doesn't monitor anything. There's no mention feed, no alerts, no sentiment and no competitor tracking. If you need to know what people say about you, you need another tool.
• Narrow audience. It's aimed at developer tools, AI-native software and self-serve B2B SaaS. Other kinds of businesses aren't what it's built for.
• It's a content channel. Google can index a post within hours and AI search starts citing posts in a few weeks, but that's compounding publishing work, not instant alerts.
• Its voice is one post a day from the brand's moderator account, not individual conversations in other communities.

Side-by-side table

Best social listening tools: the verdict

• Pick Octolens if you want a real listening feed across social, communities, news and reviews, and you want mentions routed to Slack, Linear or an agent.
• Pick Redreach if Reddit is the channel that matters and you want help finding threads (especially ones ranking on Google) to reply in yourself.
• Pick ReplyGuy if you want to find mentions across the web and have replies drafted or sent for you, and a credit-based plan from $49/mo suits your volume.
• Pick Subgrow if you sell developer tools, AI-native software or self-serve B2B SaaS and want your own posts to be what Google and AI search cite, without writing them yourself.

These also stack. Octolens tells you what's being said, and Subgrow publishes where you control the thread. You can look at Subgrow here if the owned-subreddit route sounds right.

Frequently Asked Questions

Is a social listening tool the same as a Reddit reply tool?

No. A listening tool like Octolens watches mentions across many sources and hands them to your team. Reply tools like Redreach and ReplyGuy go a step further and help you post in existing threads. Subgrow skips the threads and publishes in a subreddit you own.

Do I need a listening tool if I use Subgrow?

Subgrow doesn't track mentions, so if you want alerts about your brand or competitors, pair it with a monitoring tool. What Subgrow adds is the posts themselves, plus Google Analytics tracking so you can see visits from Reddit.

Which option is quickest to try?

ReplyGuy offers a free website audit in about 15 seconds with no account. Octolens has a 7-day free trial with no credit card and a roughly two-minute setup. Subgrow offers a free start, though its posts run on a schedule, with each one ready a week ahead.