Two Local-First B2B Mobile Apps Built With Flutter and React 19 with Capacitor 8

·6 views

VanzaLabs, a two-founder product engineering studio, built two mobile apps for small businesses and independent contractors to demonstrate production-ready software. Both apps follow a Local-First design, with data kept on the user's device or in their own cloud account rather than on intermediate backend servers. FormGrid, built with Flutter, lets users work with Google Forms and Sheets on mobile, with offline sync and ready-made business templates. Vanza, built with React 19 and Capacitor 8, handles invoices and contracts, storing client data in IndexedDB and generating PDFs in multiple templates. The team chose React for Vanza because its complex document layouts and calculations were faster to iterate on than in Flutter.

Read the full story at DEV Community

This is an AI-generated summary. ShortSingh links to the original source for the complete article.

Discussion (0)

Why agent harnesses matter for energy and token efficiency

A post on Neuralwatt's site argues that the software harness wrapping an AI model affects how much energy and how many tokens a task consumes. The piece frames harness design as a lever for efficiency alongside the model itself. It was shared on Hacker News, where it drew five points and no comments at the time of capture. The provided source text contains only the link metadata, so the specific arguments and figures in the article could not be verified here.

0 comments Read more at Hacker News

ProgrammingDEV Community ·

Cast a Local MKV With Subtitles to Chromecast Directly From Chrome

A guide explains how to stream a local MKV video, with either embedded or separate SRT/VTT subtitles, to a Chromecast or Google TV using only the Chrome browser. The user opens a web app in Chrome, selects the file, configures subtitles, and presses Cast, with the file read locally and sent over the home network rather than uploaded. The article notes that playback stops if the tab closes or the device sleeps, and that large files are streamed in chunks, with limits for files needing conversion. Android users can follow the same steps, with a screen-mirroring fallback available. Troubleshooting advice focuses mainly on network issues, such as guest Wi-Fi isolation blocking device discovery.

0 comments Read more at DEV Community

ProgrammingDEV Community ·

Tool Statically Diffs Electron App Builds to Reveal Security-Relevant Changes

A developer built hexvero, a tool that compares two Electron app.asar bundles without running either build. It links preload-script bridge members to IPC handlers and reports window setting changes such as nodeIntegration and sandbox. Where channel names cannot be resolved statically, it flags them as unresolved rather than guessing or dropping them. The tool is read-only and produces a local web view and Markdown reports, but its findings describe code contents, not exploitability. On a blind test set it found only part of the IPC channels and version changes, and the author publishes those misses.

0 comments Read more at DEV Community

ProgrammingDEV Community ·

PayGuard Local: Offline AI Tool Sorts Freelancer Invoices Into Structured Records

A developer has released PayGuard Local, a desktop utility that uses AI to organize freelancers' invoices and receipts into structured JSON records. The tool runs entirely on the user's machine using Meta's open-weight Llama 3.2 model via Ollama, so client data never leaves the laptop. It is aimed at freelancers, student developers, and small agencies who currently sort bills and log payments by hand. The creator says local inference avoids recurring per-scan API costs and allows users to swap in other models or adapt the schema to local tax formats. The project was submitted to the Hacktoberfest Open-Source AI Challenge and is available on GitHub.

0 comments Read more at DEV Community