A library is ready for version 1.0 when its maintainers can identify the public API, explain how they will preserve compatibility, and support users with reliable tests, documentation, and releases. The number is a commitment about a defined contract—not a claim that every planned feature is finished. If people already depend on the library in production or downstream projects, that is a strong reason to make the commitment explicit.
What version 1.0 means for a library
Under Semantic Versioning (SemVer), version 1.0.0 defines the public API. Before 1.0, the specification treats a project as initial development: its public API should not be considered stable, and anything may change. At 1.0, maintainers are signaling that users can rely on the API they have declared and that future changes will follow a stated versioning policy.
That contract can include more than function and type signatures. Configuration formats, documented behavior, error handling, and other interfaces users are invited to rely on may matter too. The key is to say what is supported and distinguish it from internals or experimental features.
Use user reliance as a readiness signal
The SemVer FAQ advises: “If your software is being used in production, it should probably already be 1.0.0.” It similarly points to a stable API with dependent users, or growing concern about backwards compatibility, as reasons to move to 1.0. This is a practical signal rather than a requirement that a project reach a particular number of users: once consumers are making decisions around your API, leaving its stability ambiguous can make upgrades harder to judge.
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Reliance alone does not make a library ready. It makes the need for a clear promise more urgent. If maintainers cannot yet support the compatibility expectations implied by 1.0, they should communicate that plainly and keep unstable areas visibly marked.
Check readiness across the whole release
Use these criteria to assess whether users can understand and rely on the library, not just whether it builds.
| Area | Ready signal | Warning signal |
|---|---|---|
| Public contract | Supported APIs and behaviors are identified; experimental areas are separated. | Users cannot tell supported features from internals or experiments. |
| Compatibility | Maintainers can explain and follow a forward versioning and deprecation policy. | Routine changes silently break consumers. |
| Validation | Important workflows, supported environments, and compatibility assumptions have repeatable checks. | Core behavior is largely untested or critical release checks are unreliable. |
| Adoption | Installation, examples, reference documentation, and release notes are usable. | Users must infer setup or rely on undocumented maintainer knowledge. |
| User reliance | Existing users can understand what stability commitment they are receiving. | A stable label would imply support the maintainers cannot provide. |
| Maintenance capacity | There is a credible way to triage issues and make releases. | No owner or release process exists to respond to user impact. |
Define the public API before promising stability
Write down the surfaces a consumer is meant to depend on: exported types and functions, configuration, documented behavior, error behavior, and any other supported interface. SemVer allows the declared API to be represented in code or documentation, but it needs to be precise enough that users and maintainers can tell what is covered.
Keep experimental or unstable functionality distinguishable. GNOME’s library guidance notes that a project may stabilize core functions while leaving newer functions unstable during design. That lets maintainers make a bounded promise instead of implying that every part of the library is frozen.
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Publish a compatibility and deprecation policy
State what counts as a breaking change, how deprecations work, how much migration time users receive, and how version numbers communicate change. In SemVer after 1.0, backward-compatible bug fixes increment the patch version, compatible public additions and deprecations increment the minor version, and backward-incompatible public API changes increment the major version. These labels help only if maintainers actually follow the announced policy.
Include behavior in the compatibility discussion. AndroidX’s library guidance says a behavior change that requires API documentation to change in a way that breaks existing clients should be treated as breaking, even if binary compatibility remains intact. A program can continue to compile and still fail a consumer’s expectations.
Validate behavior users depend on
Before release, exercise representative use cases and supported environments. Run unit and integration tests, available ecosystem compatibility checks, and tests for examples users are likely to copy. Resolve known release-blocking failures and unreliable checks on critical paths. These are practical readiness checks, not a universal coverage target: no single test percentage or test count establishes that every library is ready for 1.0.
Testing should reflect the contract. If users rely on a documented behavior, test that behavior where practical—not only whether a method exists or a binary remains compatible. AndroidX has explicit testing and API criteria for its own stable releases, but those project-specific requirements are not a general rule for every language or ecosystem.
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Make the library usable and maintainable
A stable release should give users enough information to adopt it without private knowledge of the maintainers. Prepare an installation route, a getting-started path, API reference, examples, release notes, and a clear support or issue-reporting route. Include license information and a reproducible release procedure as part of the project’s operational basics.
Google’s documentation guidance emphasizes getting started, running tests, debugging, and releasing the binary. Rust’s API review checklist includes documentation and release notes, while Google Open Source release preparation calls for reviewing public-facing material, security implications, and third-party license notices. These are useful examples of release discipline; the exact process should fit the library and its distribution model.
Do you need a feature-complete library or a long soak period?
No universal feature-completeness threshold or pre-release duration defines readiness. Version 1.0 is about the stability of the declared public contract, not completing every feature that might someday be useful. A library can be ready with a focused scope if its supported behavior is clear and maintainers can honor the compatibility promise.
Staged releases can help reveal problems before a stable commitment, but timelines are project-specific. AndroidX guidance, for example, expects at least two weeks in each alpha, beta, and release-candidate stage before advancing, with testing and API expectations tied to those stages. That is an AndroidX process, not a minimum waiting period for all libraries.
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