ReadMe alternatives: 11 API documentation tools compared
Teams look for a ReadMe alternative when the Pro price meets a second project, when AI features are billed on top, or when they want content to live fully in their own Git repository. Options range from specification-driven portals to open source tooling, design-first editors and general documentation builders.
Short answer: The first three alternatives to ReadMe in our API documentation tool ranking are Bump.sh, Scalar and Redocly. Places 1 to 3 go to challengers, vendors outside the best-known brands in a category, wherever the category has them; the established names follow from place 4 in their ranked order. Choose Bump.sh if you want a small French vendor and change tracking on every pull request. These 11 products are all in Best API Documentation Tools in 2026; the notes say how each one compares with ReadMe.
Vendors can pay for more visibility on this website, for example a higher place in a ranking or more room on a page. Commercial relationships can also affect which products we feature and how prominently. Every vendor link is marked the same, whatever the arrangement behind it. How that works.
Pricing: Free Starter plan; Pro billed annually with priced extra admins; Enterprise on request
Established in: Not stated by the vendor
Built for: Developer-relations teams that want interactive docs fed from pull requests
Not for: Solo maintainers with several published API versions
01
Why buyers look past ReadMe
01
One project per plan is a tight meter
Pro costs 250 dollars a month billed annually and includes 1 project, the same count as the free Starter plan. Starter also allows only 1 published version, while Pro lifts that. A company documenting several APIs, or several products, soon meets Enterprise and a sales conversation.
02
Seats and AI are priced as extras
Pro includes 5 admins, and each further admin costs 20 dollars. Ask AI is a separate add-on at 150 dollars a month on Starter and Pro, and extended history and logs add 100 dollars a month on every plan. The sticker price is therefore a starting point.
03
Governance sits in the top tier
User roles and access control, audit logs, SSO and OAuth, and removal of ReadMe branding are listed under Enterprise. Request history is held for 24 hours and metrics for 7 days on all plans we saw, which suits a light audit trail only.
your API is consumed by AI agents and you need gateway controls beside docs
#12
03
What each one does differently
1
Bump.sh
France · Published
It ducks SAS, registered in Angers, France, runs Bump.sh, and its draw is detection of breaking changes with a diff on every pull request. Basic allows 10 API docs and 3 internal users, Pro 30 docs and 5 users, with a 14-day trial on Pro. White labelling and EU data residency are reserved for Enterprise.
Switch from ReadMe if you want a small French vendor and change tracking on every pull request.
Scalar publishes its code on GitHub under the MIT licence, and the hosted product begins with a free plan of 3 APIs and 1 editor seat. Paid tiers rise with API count and seats, extra SDKs on Pro are billed monthly, and trials last 7 days. Two-way Git sync is part of the offer.
Switch from ReadMe if you want open code you could host yourself and a free tier for a few APIs.
Redocly gives Pro 3 projects with unlimited seats, readers and Git contributors, so writers cost nothing extra and projects are the meter. Its command-line linter is open source under MIT. SSO and role-based access wait until Scale, which is almost three times the Pro monthly price. Trials run 30 days.
Switch from ReadMe if many writers share one portal and you can live with a project limit.
Theneo Inc., a Delaware company with a Seattle address, prices paid plans per workspace, so headcount does not change the bill. The Starter plan holds 1 public and 2 private projects with 20 team members, and Business lists a custom domain. Self-hosting and SAML SSO belong to Enterprise, and no trial is mentioned.
Switch from ReadMe if you want a free start with several private projects and workspace-level pricing.
Starter allows 5 editor seats but no AI features, which come with Pro and its 10,000 monthly credits. Extra credits cost one cent each, so heavy AI use lifts the bill. Non-commercial open source projects may apply for Pro free of charge. The terms and privacy pages we tried returned 404.
Switch from ReadMe if you document an open source project and want AI features with the credits metered.
The footer reads Fern, a Postman company. Its free plan is wide, with ten team members, a thousand pages, a custom domain, an API explorer and an MCP server, covering OpenAPI, AsyncAPI, gRPC, GraphQL and OpenRPC. SSO, SCIM and self-hosting are Enterprise only. Pages we read name no trial or country.
Switch from ReadMe if you need several spec formats on a free plan and accept Postman as parent.
Stoplight's terms sit on smartbear.com and name SmartBear Software Inc. in Somerville, Massachusetts. A free column allows one user and one project, Basic bundles 3 users with a visual OpenAPI designer and instant mock servers, and teams, LDAP and SAML SSO start at Pro Team. Basic, Startup and Pro Team each include 14 days.
Switch from ReadMe if you write the OpenAPI file first and want mock servers before any code exists.
GitBook is a general documentation product. Its homepage lists Git Sync, GitBook MCP, Docs Analytics and authenticated access, though not rendering of OpenAPI files. Paid plans charge per site and again per user, a custom domain needs Essential, and GitBook INC. gives a Covina, California address. A free plan covers one user.
Switch from ReadMe if guides and handbooks outweigh reference pages in your documentation.
Postman is an API client and workspace platform where documentation is one feature among many. The free plan covers one user, Team is priced per user with 90-day collection recovery, and SSO sits in contact-sales Enterprise. AI use is metered by credits. It is headquartered in San Francisco and was founded in Bangalore.
Switch from ReadMe if your developers already test and share collections in Postman daily.
Document360 is a knowledge-base platform, so it suits help centres more than OpenAPI reference sites. Its features include Eddy AI, an MCP Server, PDF and Word import and Mermaid diagrams. Tier prices are not published, only a quote form or demo. Content sits in Azure environments and AI processing relies on OpenAI.
Switch from ReadMe if your portal is mostly support articles with some API pages.
Speakeasy's homepage leads with Agent Identity, Agent Security, an MCP Gateway and Agent Observability, which is a different product from a docs site builder. Billing is by tokens and gateway egress under pay-as-you-go rates with no platform fee. Terms name Speakeasy Development, Inc. under California law.
Switch from ReadMe if your API is consumed by AI agents and you need gateway controls beside docs.
Redocly: Pro includes 3 projects with unlimited seats, readers and Git contributors, and trials run 30 days.
02
You want to catch breaking changes before they ship
Bump.sh: It runs a diff on every pull request, and the vendor is It ducks SAS of Angers, France.
03
You need a free start with private projects
Theneo: Starter holds 1 public and 2 private projects with 20 team members, and paid plans are priced per workspace.
04
You want open code under the MIT licence
Scalar: The code is public, with a free hosted plan of 3 APIs and 1 editor seat.
05
You design the API before writing code
Stoplight: A visual OpenAPI designer and instant mock servers come with Basic, which bundles 3 users.
04
When ReadMe is still the right choice
ReadMe is a sound choice when one product needs an interactive API reference with a try-it feature, a markdown editor, usage analytics and two-way sync on a free Starter plan. Teams that want recipes, changelog, forums and multiplayer editing in one place find them on Pro. If you have one API and a small team, check whether the 5 included admins cover you before leaving.
05
What moving off ReadMe involves
01
Content has to cross the Git boundary cleanly
ReadMe lists bi-directional sync, so your pages may already sit in a repository. Check that custom MDX components, reusable content and custom CSS render in the new tool, because those Pro features rarely have exact equivalents.
02
Recreate analytics and history yourself
Request history on ReadMe is kept for 24 hours and documentation metrics for 7 days, so very little will migrate. Export what you need before cancelling and decide which new tool will own those numbers.
03
Check AI and access features before cut-over
Ask AI, AI Writer and the linter are ReadMe products. Decide whether you need replacements, and for private docs or roles check which plan of the new vendor includes them, since SSO often sits in the top tier elsewhere too.
06
Questions about replacing ReadMe
6 answers
How much does ReadMe cost?
The pricing page lists Starter at 0, Pro at 250 dollars a month billed annually and Enterprise by contact. Ask AI adds 150 dollars a month and extended history and logs add 100 dollars a month.
Which alternatives have a free plan?
Scalar lists 3 APIs and 1 editor seat, Theneo's Starter offers 1 public and 2 private projects, Mintlify has a Starter with 5 editor seats, and Fern lists ten team members. Stoplight and GitBook allow one user.
Which alternative is open source?
Scalar publishes its code under the MIT licence, and Redocly's command-line linter is open source under MIT. The hosted products of both are paid beyond their entry plans.
Is there a European alternative?
Bump.sh is run by It ducks SAS in Angers, France, and EU data residency is an Enterprise feature there. Most other vendors named here do not state a European country on the pages we read.
Can I self-host instead?
Theneo lists self-hosting under Enterprise, and Fern does the same. Scalar's open code is another route, and you take on updates and hosting.
Does GitBook suit an API portal?
It suits guides and handbooks. Its homepage feature list does not name OpenAPI rendering, so test your specification first.
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Sources
Checked 9 November 2026
ReadMe pricing: Starter 0, Pro 250 dollars annually, 1 project, 5 admins, extra admins 20 dollars, Ask AI 150 dollars, history add-on 100 dollars, 24-hour request history, 7-day metrics.
Founder of The Knowledge Engineers and of 2 Steps Ahead, an AI search visibility agency. Editorially responsible for every page on this site; research and drafting are AI-assisted.
Checked and edited by Sebastiaan Smits, last on 9 November 2026. The editorial process explains the method.
