Every knowledge base I've worked with was accurate on the day it launched. Then the product shipped a redesigned settings page and the articles kept describing the old one. Nobody notices until a customer follows the steps and can't find the button.
So when I compare knowledge base software, writing the articles matters less to me than how they stay current after you ship. The tools below split into four groups on exactly that: help centers attached to a helpdesk, standalone knowledge base tools, docs kept in Git next to your code, and one option that doesn't ask you to write articles at all.
We build Frigade, which is that last option, so read that entry knowing who wrote it.
If you're picking the AI that answers support questions rather than the place the answers live, the AI customer support tools list covers that side.
A help center attached to a helpdesk is the default. Zendesk, Intercom, Help Scout, and Freshdesk all ship one, and their AI agents answer from it. The upside is that support writes the articles in the same tool they answer tickets in. The downside is that support writes the articles, and on most teams I've worked with, support finds out about a product change from the first confused ticket.
A standalone knowledge base tool is for companies where documentation is someone's actual job. Document360 gives that person a full editing and review workflow instead of a helpdesk add-on. It's still manual writing, just with better tools for it.
Docs-as-code puts the articles in a Git repo, so a docs change can ship in the same pull request as the code change. GitBook and Mintlify are the two I see most. This is the best setup I know of for staying current by hand, as long as your engineers write the docs. If support or success owns the docs, check how much of the work happens in the repo. GitBook gives non-engineers an editor, and Mintlify is built around the repo.
Then there's the option of not writing the knowledge yourself. Frigade's assistant builds its own knowledge of your product by using it, and keeps it up to date automatically as the product changes. That's a different thing from a help center, and I'll get into where it fits.
| Tool | Group | Good fit for | Starts at |
|---|---|---|---|
| Zendesk | Helpdesk help center | Teams already on Zendesk for support | $55 per agent/mo, Suite Team |
| Frigade | In-product assistant | Users asking how to do things in the app | Free trial, then $1,000/mo |
| Intercom | Helpdesk help center | Teams on Intercom, especially running Fin | $29 per seat/mo, Essential |
| Help Scout | Helpdesk help center | Smaller teams that want something simple | Free plan with one Docs site |
| Freshdesk | Helpdesk help center | Cost-sensitive teams that want ticketing and a KB | $19 per agent/mo, Growth |
| Document360 | Standalone | A dedicated docs writer or team | Quote based |
| GitBook | Docs-as-code | Product and technical docs synced with Git | Free, $65 per site/mo paid |
| Mintlify | Docs-as-code | API and developer documentation | Free starter, $450/mo Pro |
Prices are list prices from each vendor's pricing page as of October 2026. Annual billing where the page defaults to it.
Zendesk's help center comes with every Suite plan, starting at $55 per agent per month billed annually. Suite Professional ($115) lets you run up to five help centers if you have multiple brands. If support already lives in Zendesk, this is the easy choice, because ticket replies, macros, and the AI agent can all pull from the same articles. Where it doesn't fit is a company that doesn't use Zendesk for support. Paying per agent just to get the help center adds up.
Frigade is an AI assistant that runs inside your product rather than a help center you publish. Instead of depending on articles someone wrote, it builds its own knowledge by using the product the way a new user would, and it keeps that knowledge up to date automatically when you ship changes. When a user asks how to do something, it answers from the current product and can open the screen and do the steps for them. It can also read whatever docs you already have.
With Frigade you don't need a help center at all. Users get the answer inside your product while they're using it, so they never have to leave the app or search Google for an article. I think that's where in-product help is going.
There's a free trial, then it's $1,000 per month. You can also book a free demo on frigade.com.
Intercom's Essential plan ($29 per seat per month) includes a public help center, and Advanced is $85. The main reason to pick it is Fin. Fin answers from your help center articles, and it's priced at $0.99 per outcome, so the quality of the articles turns straight into the quality of the answers. If you're comparing Intercom as a whole against other helpdesks, we wrote Intercom alternatives separately.
Help Scout has a free plan for up to five users that includes one Docs site, and paid plans start at $25 per user. AI Answers costs $0.75 per resolution and answers from your Docs. It's the simplest option here and the editor is pleasant to use. I'd look elsewhere if you need heavy versioning or fine-grained permissions across several knowledge bases.
Freshdesk includes a knowledge base on every plan, and Growth starts at $19 per agent per month billed annually, with Pro at $55 and Enterprise at $89. There's no free plan, but there is a 14-day trial. Freddy AI comes with 500 sessions before it's $49 per 100, and it can answer from your articles. It's a good pick for a cost-sensitive support team that wants ticketing and a help center in one tool. If you don't need the helpdesk, you're paying per agent for a knowledge base.
Document360 is a standalone knowledge base for public and internal docs. It's built for a person or team whose job is documentation, and the editing and review workflow shows it. Pricing is quote based now, so you won't get a number before a sales call. If nobody on your team owns docs full time, it's more tool than you need.
GitBook has a free plan, and paid sites start at $65 per site per month with $12 per extra user. Git sync is on every plan, so engineers can edit docs in the repo while everyone else uses the editor. It's the best middle ground I've seen between docs-as-code and a normal editor. It's aimed at product and technical docs more than at support articles like "how do I reset my password."
Mintlify's starter plan is free and Pro is $450 per month. It's built for developer documentation, with API references and docs written in MDX that live in your repo. If your users are developers integrating with an API, it's where I'd start. For non-technical end users who need help with the app itself, it's the wrong fit.
Look at who changes your product and who changes your docs. If they're the same people, docs-as-code works, and GitBook or Mintlify will keep up. If support owns the docs, use the help center that comes with your helpdesk, and set up some way for support to hear about releases before customers do.
Then check what your users actually ask. If most of it is policy and billing, any knowledge base here will handle it. If most of it is how to do something in the product, an assistant that keeps its own knowledge current will answer those better than an article that was right two releases ago.
It depends on who writes your docs. If support owns them, use the help center in your helpdesk (Zendesk, Intercom, Help Scout, or Freshdesk). If you have a dedicated docs writer, Document360. If engineers write the docs, GitBook or Mintlify. If what you need is answers to "how do I" questions inside the product, Frigade builds its own knowledge of your product and keeps it current automatically.
Help Scout's free plan includes one Docs site for up to five users. GitBook and Mintlify both have free plans, and they're aimed at technical and developer documentation. Zendesk and Intercom don't have free plans.
Tie doc updates to releases. Docs-as-code tools like GitBook and Mintlify let a docs change ship in the same pull request as the code. Helpdesk help centers need a process where support hears about changes before customers do. The other option is an in-product assistant like Frigade, which builds its own knowledge of the product and updates it automatically when the product changes.
A knowledge base is a set of articles your team writes and publishes. An in-product assistant runs inside your app and answers questions there. Frigade's assistant builds its own knowledge by using your product, so it doesn't depend on articles being current, and it can do the steps for the user instead of linking to a page. Plenty of SaaS companies run both.
With an inbox agent, yes. Intercom Fin and Zendesk's AI agent answer mostly from your help center, so stale articles mean stale answers. Frigade doesn't need one, because it learns the product by using it and answers users inside the app.
