UnderPeaks says it made a data model the shared blueprint for backend data and generated application structure in Flutter and Next.js. The goal, according to its September 24, 2026 article, is to reduce the small mismatches that can accumulate when mobile and web clients are maintained separately. That is a specific product approach—not evidence that every kind of client drift disappears.
What “single source of truth” means here
In this account, the phrase refers to one model intended to describe both backend data and enough application details to generate client pages. It does not mean one canonical data store, automatic synchronization between running clients, or a universal consistency system.
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UnderPeaks frames the decision this way: “do you build two frontends against one backend, or do you try to share more than that?” Its answer is to share more than the backend contract: let the model inform the applications as well. The author summarizes the idea as: “the schema shouldn’t just define your backend, it should define your applications too.”
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The article describes an UnderPeaks model as carrying four kinds of information:
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- Field types: the data fields and their types.
- UI hints: information intended to guide how fields appear in the interface.
- Relationships: connections between data entities.
- Validation: rules for checking input.
UnderPeaks says this information can generate a working page for both Flutter mobile and Next.js web applications. The stated benefit is that changing the model and regenerating updates both clients, rather than requiring the same underlying change to be implemented separately in each.
How the author says regeneration handles customization
A generator can create a new maintenance problem if it overwrites hand-edited work. UnderPeaks says its system tracks customized files with checksums and leaves those files untouched during regeneration, while merging genuinely new pieces—such as a newly added field—into the applications.
That is the author’s description of the implementation, not a behavior demonstrated with a test result in the article. The article includes no public schema example, generated-code sample, or reproducible walkthrough. A team evaluating the approach would need to inspect how the system handles conflicts, edits to generated files, and changes that affect customized components.
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UnderPeaks lists Supabase, Postgres, MySQL, MongoDB, and Firebase as backends available through one adapter interface. The article does not provide backend versions, a compatibility matrix, feature-parity details, or migration instructions. An adapter interface alone does not establish that these services are interchangeable: teams still need to check whether each option supports their required data model, queries, deployment, and operational practices.
Questions to resolve before adopting this pattern
Sharing model and generation rules may reduce duplicated definitions, but it also makes the model and generator part of the application’s change process. Before relying on the approach, a team should establish how it fits its own code and delivery practices:
- Which layers are actually shared: data definitions, validation, UI metadata, generated code, or application logic?
- How are mobile and web conventions or client-specific layouts represented without forcing both interfaces into the same shape?
- How are generated changes reviewed, tested, and merged with hand-written code?
- What happens when a model change conflicts with a customized file?
- Does the chosen backend support the needed features and operational requirements?
- Who maintains the generator and deployment, and what licensing or hosting terms apply?
The article does not compare this approach with independently implemented clients or other shared-codebase patterns, so it cannot establish which option is best or quantify any reduction in maintenance effort. Those are questions to answer through the project’s requirements and a concrete evaluation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What UnderPeaks says about Core and Studio
The article describes UnderPeaks Core as free, open source, and self-hosted, and UnderPeaks Studio as a hosted option for teams seeking managed infrastructure. It does not provide license text, pricing, service terms, or a detailed feature comparison. Those details should be confirmed from current product information before making a commercial or deployment decision.
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