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Discover the best AI summarizer tools for different scenarios, from general-purpose text to sales meetings. Learn the pros and cons of popular tools and find the perfect fit for your needs.
April 15, 2023
Nishit Asnani

We are now living in the post-ChatGPT world, where quality summarization is abundant, and we have more choices than ever as consumers to summarize any kind of text. 

AI summarization tools help us digest vast amounts of information and present it in a concise, easy-to-understand format. 

In this guide, we dive into the different kinds of summarization, the top use cases for it, and the most popular tools for each use case. This obviously is evolving very quickly, since there are new AI tools being developed and deployed every single day, and a new summarizer every week that’s based on some alteration in a popular large language model (LLM). 

So tighten your seatbelt for a whirlwind tool on summarization!

Personal Note

Text summarization is actually quite close to my heart. I started out working in natural language processing during a winter internship at, where I worked on text summarization models for news. That project helped me go deep into the topic, and I ended up working on summarization in a variety of projects after that in school, work, and eventually in my own startup, Sybill. 

If it were not for my interest in summarization, Sybill might not have been there, and I might be doing something else. So yeah, summarization is quite close to my heart as a technical problem to solve and a use case to dive deep into, and I hope you’ll get a lot out of this guide as you make your own choices. 

Interlude: types of summarization

Before we dive into the best AI tools for creating a summary of a given piece of text, let’s look into what we exactly mean when we talk of a summary. There are two technical ways in which a summary is created:

  1. Extractive summarization involves selecting the most relevant sentences or phrases from the source text and combining them to create a summary. This approach maintains the original wording but can result in summaries that lack coherence or may miss important context.
  2. Abstractive summarization, on the other hand, generates a summary by rephrasing and reorganizing the source text. This approach creates more natural-sounding summaries that better capture the overall meaning of the text. However, it can sometimes introduce inaccuracies or generate summaries that deviate from the original content.

So when you pick out the most important or representative quotes from a graduation speech, it’s a form of extractive summarization. 

When you go home after work and tell your partner or friend about how your day was, that's an abstractive summary. 

When to Use Extractive or Abstractive Summarization

Extractive summarization is best suited for scenarios where maintaining the original wording is important, such as when summarizing legal documents or scientific research papers. 

Abstractive summarization works well for summarizing conversations, news articles, or blog posts, where the focus is on conveying the main ideas rather than preserving the exact language.

The Context and Use Case Dependency of Summarization

Real-life Examples and Choosing the Right Tool

Summarization is highly context and use-case dependent. A tool that excels at summarizing one type of content might struggle with another. For example, a summarizer designed for blog posts and web pages may perform poorly when summarizing conversations or legal reports. To choose the right summarization tool, consider the specific requirements of your use case and evaluate each tool's ability to address those needs.

There obviously are certain general-purpose summarizers like ChatGPT that can summarize a variety of types of text well. But when it comes to enterprise use cases or critical use cases like medicine, a general-purpose summarizer’s accuracy and coverage would not be sufficient, and you would need AI summarizers that are specifically tuned to those use cases. 

In this guide, we will focus primarily on long-form text summarizers and conversational summarizers, since I have limited experience with legal or medical summarization. 

AI Summarization Tools

General-Purpose Text Summarizers

These tools are general-purpose, i.e. they are good at summarizing a variety of types of text. They can deal with articles and scientific papers reasonably well at the one end, and with conversations and logs at the other. However, they may not be best suited for specialized use cases, but might be a good starting point even for them. 

Most of the popular LLMs are pretty good at this - ChatGPT, Claude, and Bard to name a few. Pre-LLM revolution summarizers like QuillBot, OneAI and the lot also come under this category. Let’s look a bit more deeply at the most popular ones in each of those buckets. 


ChatGPT, powered by OpenAI, is a popular AI summarizer for general-purpose text. It excels at generating coherent and concise summaries while maintaining the overall meaning of the source text. You can also tune the length, the tone and the focus of the summary by cleverly prompting it and stating your intent. 

However, it may sometimes generate summaries that deviate from the original content or introduce inaccuracies. It might also miss important details from summaries, since it’s not easy for it to know what a domain-specific important detail is (for instance, a prospect might mention in a sales call that they use Salesforce as their CRM system, but if that’s the only sentence in a 45 min call that references this fact, ChatGPT may fail to pick it up while summarizing the call, since it doesn’t know that that could be an important detail for the salesperson). 


Quillbot is a versatile AI summarizer that works well for general-purpose text summarization. It offers multiple modes, including standard, creative, and formal, to cater to various content types. However, it may not always provide the most accurate summaries, especially when dealing with complex or niche topics.

PS: QuillBot has also nailed the SEO game for AI summarizers, and I tend to be a little skeptical of the tools that do because their superior SEO position gives them a chance over the long term not to be the innovation leader and still get the required demand. However, I recommend you try it out for yourself and figure out if it’s a good fit for your use case. 

QuillBot has written a blog post on how it can work together with ChatGPT. I personally don’t find the arguments convincing enough - whatever it says that QuillBot can do (summarize, paraphrase, etc.) on top of ChatGPT output is something ChatGPT itself can also do. However, plagiarism detection and citations might be interesting topics to look into, if you’re considering QuillBot. 

Conversation Summarizers

Why not use ChatGPT or a similar LLM for summarizing conversations?

3 major reasons why you shouldn’t use ChatGPT for summarizing conversations:  

  1. Prompting: You need to be an experienced prompt engineer with lots of tweaks up your sleeve to get ChatGPT to summarize specific types of conversations appropriately for you. If you just ask it for a summary of a conversation given its transcript, it simply won’t work as well as a domain-specific tool will. 
  2. Multimodality: ChatGPT can only summarize based on text. It can’t take in other parts of the conversation, like the video, audio, or metadata of participants, or context from other channels of communication like email or social media. Figuring this out on your own brings back to the first point - it’s a steep learning curve to figure out how to provide all of that context with the right prompts to generate the best possible summary. 
  3. Workflow: ChatGPT is a standalone application, and doesn’t yet integrate with the system of record for your conversations yet. The summarizers close to the conversation providers like Microsoft Teams are meant for general-purpose meetings, and such don’t cater to any specific types of meetings (product design calls, sales calls, consultation calls, etc.).

Now, let’s dive into some conversation-specific summarizers:

Otter has established itself as one of the best end-user-facing transcription tools out there. It has a low word error rate, a decent way of matching statements to speakers, and doesn’t generally crash. But is Otter a good bet for call summaries?

For example, the above is a summary of a call that I had, discussing a content writer position in my startup, Sybill. As you can see, it’s not really a summary. 

Otter produces an outline of the conversation, sort of like creating chapters. And the chapters are decent, but they don’t construe a summary at all. They are pointers to specific timestamps in the transcript. 

If that’s what you want, and you’re okay listening to the call transcript later on, that might be fine for you. If you really want a summary that’s both accurate and covers the gist of the call without having you watch or listen to the call, then Otter’s summaries fall a little bit short. 

Fireflies is another popular meeting transcription software with a slick UI. It excels in the number of integrations it has to meeting providers, and the number of supported languages. Let’s look at the summaries now:

As you can see, the summary includes a few key pointers from the meeting. It’s a pretty good starting point for summarizing general-purpose meetings. You can read more about their summarization and how they compare in their own article

However, Fireflies suffers from the same issue that AI summarizers at the heart of meeting providers like MS Teams suffer from: their summaries are general purpose. They include key pointers like tasks, decisions and next steps, but don’t capture domain-specific information. 

For example, a user research-focused summarizer would have a section that captures feature requests. A sales-focused summarizer would have a section that captures the prospect’s areas of interest. A customer support-focused summarizer would have a section that captures customer pain points with their usage of the product or service. 

You get the drill. And this brings us to…

Sales conversation summarizers

While I’m not an expert at judging summarizers of user research calls or legal discussions or hiring calls, I am deeply familiar with sales call summarizers. The space is rapidly evolving, and new players are entering the market every week. 

Here are a few aspects that an AI summarizer of sales calls needs to take into account:

  1. Participant context: It must know who is on the seller side and who is on the buyer side in any given conversation. 
  2. Conversation context: This includes identifying the unique language, terminologies, and jargon used in sales interactions. By recognizing the context, the summarizer can extract relevant information and create meaningful summaries. If it has context about the product being sold and previous conversation history with the specific buyer, the summaries could be way better. 
  3. Key Points and Action Items: An effective AI summarizer for sales calls should identify and highlight the most critical points discussed during the call, such as pain points, objections, solutions proposed, and any commitments made by either party. Additionally, it should also extract action items and follow-up tasks to ensure that sales reps can act on them promptly.
  4. Sentiment Analysis: Understanding the sentiment and tone of the conversation is crucial for sales teams. A good AI summarizer should be able to analyze the emotions expressed during the call, providing insights into the prospect's feelings and attitudes towards the product or service being discussed.
  5. Customization: Every sales team has its unique workflow and requirements. An AI summarizer should offer customization options, allowing users to tailor the summaries according to their needs, such as including specific data points, following a specific sales methodology, or integrating with other sales tools. 
  6. Ease of Use: A good AI summarizer for sales calls should be user-friendly, with an intuitive interface that allows sales reps to access and understand the summaries quickly, without requiring extensive training or technical expertise. Ideally, it should integrate seamlessly with a CRM system, Slack, email, and the other tools that salespeople use on a daily basis. 
  7. Extending the use of summaries: These summaries should be used by the tool to do even more intelligent tasks, like auto-fill up of CRM, generation of follow-up emails after every call, recommended next steps beyond what was discussed in the call, deal strategy, etc. Futuristic, but totally relevant to sales. 

Now, let’s pick a couple of sales conversation summarizers and see how they do here. 


I’m one of the founders of Sybill, so let’s see how Sybill does against the criteria that I highlighted above. 

Sybill has a lot of context about conversation participants (their role, their LinkedIn profile, call metadata, and more), and a pretty good level of conversation and company context as well. It captures all the key points of interest, pain points, and points of hesitation or objections from calls in neat sections. The summaries come right into your email and Slack, as well as get pushed into your CRM systems automatically tagged to the right opportunity, company, and contact. 

Sybill is also the only sales summarization tool in the market that captures and synthesizes insights from video data. It captures participant engagement and excitement levels by quantifying their non-verbal reactions throughout the call, which provides key insights into all buyers’ interest points and areas where they didn’t really care. 

Behavior AI + Generative AI = best-in-class call summaries. 

Sybill doesn’t yet support the customization of call summaries. The important word in the previous sentence is “yet”. :) 

Sybill was also the first sales intelligence tool to introduce structured call summaries and will continue to keep the innovator’s lead. It’s poised to be the all-in-one personal assistant for sales professionals.

Oh, and before I forget. Sybill also crafts an automated follow-up email from the summaries that it generates, so you can send a follow-up with just a click. Shown to save 45-60 mins per day in follow-ups and note-taking for an average SaaS sales rep. 


Avoma summarizes sales calls neatly into various sections as well. It’s a meeting intelligence platform and aims to assist sellers before, during, and after each meeting. It fairs pretty well on having participant context, and capturing key takeaways from meetings. 

Avoma integrates pretty well with CRM systems (they don’t mention a Slack integration on their website) as well and allows category customization in the summaries. 

Avoma doesn’t capture participant reactions during the call, and therefore its summaries only focus on the most important takeaways from the transcript, rather than focusing on the trifecta of the transcript, audio tonality, and video. 

Avoma also doesn’t create follow-up emails from summaries or surface any recommended next steps based on deal context. 

Overall, it’s a good call recording and summarization tool. However, the lack of capabilities in taking advantage of the summary for actionable next steps like email creation, and the unavailability of insights based on buyer engagement and excitement levels makes its price tag seem a little steep. 

Other tools

Other sales conversation intelligence tools like Wingman are also coming up with summarization capabilities, and more will come. Consumers are going to have plenty of choice going forward. :) 

When making a decision of what AI summarization tool to use and purchase, it’s important to keep in mind what your key factors are - optimizing on price, capabilities, ability to out-innovate the market, ease of use and customizability would all be important factors in this evaluation. 

In conclusion, AI summarization tools are revolutionizing the way we consume and process information, particularly in the realm of sales calls. By understanding the unique challenges and requirements of summarizing sales conversations, AI-powered tools can deliver concise, relevant, and actionable summaries that drive productivity and enable sales teams to focus on closing deals and nurturing relationships.

Embrace the power of AI summarization and stay ahead of the curve by leveraging cutting-edge tools that help you stay organized, informed, and efficient in today's competitive sales landscape.

And if you’re looking to evaluate a summarization tool in the near future - check out Sybill’s Magic Summaries.

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